/usr/bin/diffoscope --timeout 7200 --html /srv/reproducible-results/rbuild-debian/r-b-build.0XHzu1yh/libpqxx_7.10.0-1.diffoscope.html --text /srv/reproducible-results/rbuild-debian/r-b-build.0XHzu1yh/libpqxx_7.10.0-1.diffoscope.txt --json /srv/reproducible-results/rbuild-debian/r-b-build.0XHzu1yh/libpqxx_7.10.0-1.diffoscope.json --profile=- /srv/reproducible-results/rbuild-debian/r-b-build.0XHzu1yh/b1/libpqxx_7.10.0-1_amd64.changes /srv/reproducible-results/rbuild-debian/r-b-build.0XHzu1yh/b2/libpqxx_7.10.0-1

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/srv/reproducible-results/rbuild-debian/r-b-build.0XHzu1yh/b2/libpqxx_7.10.0-1_amd64.changes ¶

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1	·3de9e6c6de7d479682e664fb74093a18·2520604·debug·optional·libpqxx-7.10-dbgsym_7.10.0-1_amd64.deb	1	·3de9e6c6de7d479682e664fb74093a18·2520604·debug·optional·libpqxx-7.10-dbgsym_7.10.0-1_amd64.deb
2	·cbb570504f0e89afc770bda2864c9bc7·190444·libs·optional·libpqxx-7.10_7.10.0-1_amd64.deb	2	·cbb570504f0e89afc770bda2864c9bc7·190444·libs·optional·libpqxx-7.10_7.10.0-1_amd64.deb
3	·13963e69ee9bee953c7a1dc0392f69e5·359920·libdevel·optional·libpqxx-dev_7.10.0-1_amd64.deb	3	·13963e69ee9bee953c7a1dc0392f69e5·359920·libdevel·optional·libpqxx-dev_7.10.0-1_amd64.deb
4	·~~3f2~~13~~97c~~1~~1c3~~947~~6f6be2~~dd3f~~f783bbf~~·263~~6984~~·doc·optional·libpqxx-doc_7.10.0-1_all.deb	4	·2eb1a4610de9457f4eff9dddf65bdef9·2637412·doc·optional·libpqxx-doc_7.10.0-1_all.deb

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1	-rw-r--r--···0········0········0········4·2025-01-07·17:35:40.000000·debian-binary	1	-rw-r--r--···0········0········0········4·2025-01-07·17:35:40.000000·debian-binary
2	-rw-r--r--···0········0········0····32340·2025-01-07·17:35:40.000000·control.tar.xz	2	-rw-r--r--···0········0········0····32368·2025-01-07·17:35:40.000000·control.tar.xz
3	-rw-r--r--···0········0········0··2604452·2025-01-07·17:35:40.000000·data.tar.xz	3	-rw-r--r--···0········0········0··2604852·2025-01-07·17:35:40.000000·data.tar.xz

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control.tar ¶

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data.tar.xz ¶

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data.tar ¶

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file list ¶

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./usr/share/doc/libpqxx-doc/doxygen-html/accessing-results.html ¶

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./usr/share/doc/libpqxx-doc/doxygen-html/classpqxx_1_1array__parser.html ¶

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./usr/share/doc/libpqxx-doc/doxygen-html/classpqxx_1_1basic__fieldstream.html ¶

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./usr/share/doc/libpqxx-doc/doxygen-html/classpqxx_1_1basic__ilostream.html ¶

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./usr/share/doc/libpqxx-doc/doxygen-html/classpqxx_1_1basic__olostream.html ¶

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./usr/share/doc/libpqxx-doc/doxygen-html/classpqxx_1_1blob.html ¶


Offset 543, 15 lines modified		Offset 543, 15 lines modified
543	··<td·class="mlabels-right">	543	··<td·class="mlabels-right">
544	<span·class="mlabels"><span·class="mlabel">inline</span></span>··</td>	544	<span·class="mlabels"><span·class="mlabel">inline</span></span>··</td>
545	··</tr>	545	··</tr>
546	</table>	546	</table>
547	</div><div·class="memdoc">	547	</div><div·class="memdoc">

548	<p>Read·up·to·<code>std::size(buf)</code>·bytes·from·the·object.·</p>	548	<p>Read·up·to·<code>std::size(buf)</code>·bytes·from·the·object.·</p>
549	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000035">Deprecated:</a></b></dt><dd>As·libpqxx·moves·to·C++20·as·its·baseline·language·version,·this·will·take·and·return·<code>std::span<std::byte></code>.</dd></dl>	549	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000002">Deprecated:</a></b></dt><dd>As·libpqxx·moves·to·C++20·as·its·baseline·language·version,·this·will·take·and·return·<code>std::span<std::byte></code>.</dd></dl>
550	<p>Retrieves·bytes·from·the·blob,·at·the·current·position,·until·<code>buf</code>·is·full·(i.e.·its·current·size·is·reached),·or·there·are·no·more·bytes·to·read,·whichever·comes·first.</p>	550	<p>Retrieves·bytes·from·the·blob,·at·the·current·position,·until·<code>buf</code>·is·full·(i.e.·its·current·size·is·reached),·or·there·are·no·more·bytes·to·read,·whichever·comes·first.</p>
551	<p>This·function·will·not·change·either·the·size·or·the·capacity·of·<code>buf</code>,·only·its·contents.</p>	551	<p>This·function·will·not·change·either·the·size·or·the·capacity·of·<code>buf</code>,·only·its·contents.</p>
552	<p>Returns·the·filled·portion·of·<code>buf</code>.·This·may·be·empty.·</p>	552	<p>Returns·the·filled·portion·of·<code>buf</code>.·This·may·be·empty.·</p>

553	</div>	553	</div>
554	</div>	554	</div>
555	<a·id="a2066f1b112029d66c2a7880592a199e2"·name="a2066f1b112029d66c2a7880592a199e2"></a>	555	<a·id="a2066f1b112029d66c2a7880592a199e2"·name="a2066f1b112029d66c2a7880592a199e2"></a>

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./usr/share/doc/libpqxx-doc/doxygen-html/classpqxx_1_1connection.html ¶


Offset 788, 15 lines modified		Offset 788, 15 lines modified
788	··········<td·class="memname">std::vector<·<a·class="el"·href="classpqxx_1_1errorhandler.html">pqxx::errorhandler</a>·*·>·pqxx::connection::get_errorhandlers·</td>	788	··········<td·class="memname">std::vector<·<a·class="el"·href="classpqxx_1_1errorhandler.html">pqxx::errorhandler</a>·*·>·pqxx::connection::get_errorhandlers·</td>
789	··········<td>(</td>	789	··········<td>(</td>
790	··········<td·class="paramname"></td><td>)</td>	790	··········<td·class="paramname"></td><td>)</td>
791	··········<td>·const</td>	791	··········<td>·const</td>
792	········</tr>	792	········</tr>
793	······</table>	793	······</table>
794	</div><div·class="memdoc">	794	</div><div·class="memdoc">
795	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000036">Deprecated:</a></b></dt><dd>Return·pointers·to·the·active·errorhandlers.·</dd></dl>	795	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000042">Deprecated:</a></b></dt><dd>Return·pointers·to·the·active·errorhandlers.·</dd></dl>
796	<p>The·entries·are·ordered·from·oldest·to·newest·handler.</p>	796	<p>The·entries·are·ordered·from·oldest·to·newest·handler.</p>
797	<p>The·pointers·point·to·the·real·errorhandlers.·The·container·it·returns·however·is·a·copy·of·the·one·internal·to·the·connection,·not·a·reference.·</p>	797	<p>The·pointers·point·to·the·real·errorhandlers.·The·container·it·returns·however·is·a·copy·of·the·one·internal·to·the·connection,·not·a·reference.·</p>

798	</div>	798	</div>
799	</div>	799	</div>
800	<a·id="a7fabf1d8ada47fd82d16a4a50ae7170b"·name="a7fabf1d8ada47fd82d16a4a50ae7170b"></a>	800	<a·id="a7fabf1d8ada47fd82d16a4a50ae7170b"·name="a7fabf1d8ada47fd82d16a4a50ae7170b"></a>
801	<h2·class="memtitle"><span·class="permalink"><a·href="#a7fabf1d8ada47fd82d16a4a50ae7170b">◆ </a></span>get_notifs()</h2>	801	<h2·class="memtitle"><span·class="permalink"><a·href="#a7fabf1d8ada47fd82d16a4a50ae7170b">◆ </a></span>get_notifs()</h2>
Offset 1528, 15 lines modified		Offset 1528, 15 lines modified
1528	··········<td>)</td>	1528	··········<td>)</td>
1529	··········<td></td><td>·&</td>	1529	··········<td></td><td>·&</td>
1530	········</tr>	1530	········</tr>
1531	······</table>	1531	······</table>
1532	</div><div·class="memdoc">	1532	</div><div·class="memdoc">

1533	<p>Set·session·variable,·using·SQL's·<code>SET</code>·command.·</p>	1533	<p>Set·session·variable,·using·SQL's·<code>SET</code>·command.·</p>
1534	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000037">Deprecated:</a></b></dt><dd>To·set·a·session·variable,·use·<a·class="el"·href="classpqxx_1_1connection.html#ae23a5c19af62349c1924ec26d93c81d5">set_session_var</a>.·To·set·a·transaction-local·variable,·execute·an·SQL·<code>SET</code>·command.</dd></dl>	1534	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000043">Deprecated:</a></b></dt><dd>To·set·a·session·variable,·use·<a·class="el"·href="classpqxx_1_1connection.html#ae23a5c19af62349c1924ec26d93c81d5">set_session_var</a>.·To·set·a·transaction-local·variable,·execute·an·SQL·<code>SET</code>·command.</dd></dl>
1535	<dl·class="section·warning"><dt>Warning</dt><dd>When·setting·a·string·value,·you·must·escape·and·quote·it·first.·Use·the·<a·class="el"·href="classpqxx_1_1connection.html#ae871e3c436af0ed50e1373d9157e7340">quote()</a>·function·to·do·that.</dd>	1535	<dl·class="section·warning"><dt>Warning</dt><dd>When·setting·a·string·value,·you·must·escape·and·quote·it·first.·Use·the·<a·class="el"·href="classpqxx_1_1connection.html#ae871e3c436af0ed50e1373d9157e7340">quote()</a>·function·to·do·that.</dd>
1536	<dd>	1536	<dd>
1537	This·executes·an·SQL·query,·so·do·not·get·or·set·variables·while·a·table·stream·or·pipeline·is·active·on·the·same·connection.</dd></dl>	1537	This·executes·an·SQL·query,·so·do·not·get·or·set·variables·while·a·table·stream·or·pipeline·is·active·on·the·same·connection.</dd></dl>
1538	<dl·class="params"><dt>Parameters</dt><dd>	1538	<dl·class="params"><dt>Parameters</dt><dd>
1539	··<table·class="params">	1539	··<table·class="params">
1540	····<tr><td·class="paramname">var</td><td>Variable·to·set.·</td></tr>	1540	····<tr><td·class="paramname">var</td><td>Variable·to·set.·</td></tr>
1541	····<tr><td·class="paramname">value</td><td>New·value·for·Var.·This·can·be·any·SQL·expression.·If·it's·a·string,·be·sure·that·it's·properly·escaped·and·quoted.·</td></tr>	1541	····<tr><td·class="paramname">value</td><td>New·value·for·Var.·This·can·be·any·SQL·expression.·If·it's·a·string,·be·sure·that·it's·properly·escaped·and·quoted.·</td></tr>

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./usr/share/doc/libpqxx-doc/doxygen-html/classpqxx_1_1largeobject__streambuf.html ¶

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./usr/share/doc/libpqxx-doc/doxygen-html/classpqxx_1_1largeobjectaccess.html ¶

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./usr/share/doc/libpqxx-doc/doxygen-html/classpqxx_1_1params.html ¶


Offset 181, 15 lines modified		Offset 181, 15 lines modified
181	··········<td>(</td>	181	··········<td>(</td>
182	··········<td·class="paramtype"><a·class="el"·href="group__escaping-functions.html#classpqxx_1_1binarystring">binarystring</a>·const·& </td>	182	··········<td·class="paramtype"><a·class="el"·href="group__escaping-functions.html#classpqxx_1_1binarystring">binarystring</a>·const·& </td>
183	··········<td·class="paramname"><em>value</em></td><td>)</td>	183	··········<td·class="paramname"><em>value</em></td><td>)</td>
184	··········<td>·&</td>	184	··········<td>·&</td>
185	········</tr>	185	········</tr>
186	······</table>	186	······</table>
187	</div><div·class="memdoc">	187	</div><div·class="memdoc">
188	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000007">Deprecated:</a></b></dt><dd>Append·binarystring·parameter.·</dd></dl>	188	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000011">Deprecated:</a></b></dt><dd>Append·binarystring·parameter.·</dd></dl>
189	<p>The·binarystring·must·stay·valid·for·as·long·as·the·<code>params</code>·remains·active.·</p>	189	<p>The·binarystring·must·stay·valid·for·as·long·as·the·<code>params</code>·remains·active.·</p>

190	</div>	190	</div>
191	</div>	191	</div>
192	<a·id="a60b0a2f320c12b241e429865faf5bfdf"·name="a60b0a2f320c12b241e429865faf5bfdf"></a>	192	<a·id="a60b0a2f320c12b241e429865faf5bfdf"·name="a60b0a2f320c12b241e429865faf5bfdf"></a>
193	<h2·class="memtitle"><span·class="permalink"><a·href="#a60b0a2f320c12b241e429865faf5bfdf">◆ </a></span>append()·<span·class="overload">[2/6]</span></h2>	193	<h2·class="memtitle"><span·class="permalink"><a·href="#a60b0a2f320c12b241e429865faf5bfdf">◆ </a></span>append()·<span·class="overload">[2/6]</span></h2>

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./usr/share/doc/libpqxx-doc/doxygen-html/classpqxx_1_1quiet__errorhandler.html ¶

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./usr/share/doc/libpqxx-doc/doxygen-html/classpqxx_1_1row.html ¶


Offset 497, 15 lines modified		Offset 497, 15 lines modified
497	··········<td></td>	497	··········<td></td>
498	··········<td>)</td>	498	··········<td>)</td>
499	··········<td></td><td>·const</td>	499	··········<td></td><td>·const</td>
500	········</tr>	500	········</tr>
501	······</table>	501	······</table>
502	</div><div·class="memdoc">	502	</div><div·class="memdoc">
503	<p>Produce·a·slice·of·this·row,·containing·the·given·range·of·columns.</p>	503	<p>Produce·a·slice·of·this·row,·containing·the·given·range·of·columns.</p>
504	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000017">Deprecated:</a></b></dt><dd>I·haven't·heard·of·anyone·caring·about·row·slicing·at·all·in·at·least·the·last·15·years.·Yet·it·adds·complexity,·so·unless·anyone·files·a·bug·explaining·why·they·really·need·this·feature,·I'm·going·to·remove·it.·Even·if·they·do,·the·feature·may·need·an·update.</dd></dl>	504	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000015">Deprecated:</a></b></dt><dd>I·haven't·heard·of·anyone·caring·about·row·slicing·at·all·in·at·least·the·last·15·years.·Yet·it·adds·complexity,·so·unless·anyone·files·a·bug·explaining·why·they·really·need·this·feature,·I'm·going·to·remove·it.·Even·if·they·do,·the·feature·may·need·an·update.</dd></dl>
505	<p>The·slice·runs·from·the·range's·starting·column·to·the·range's·end·column,·exclusive.·It·looks·just·like·a·normal·result·row,·except·slices·can·be·empty.·</p>	505	<p>The·slice·runs·from·the·range's·starting·column·to·the·range's·end·column,·exclusive.·It·looks·just·like·a·normal·result·row,·except·slices·can·be·empty.·</p>

506	</div>	506	</div>
507	</div>	507	</div>
508	<a·id="a0cc2133611f007e7390988f6110245c8"·name="a0cc2133611f007e7390988f6110245c8"></a>	508	<a·id="a0cc2133611f007e7390988f6110245c8"·name="a0cc2133611f007e7390988f6110245c8"></a>
509	<h2·class="memtitle"><span·class="permalink"><a·href="#a0cc2133611f007e7390988f6110245c8">◆ </a></span>table_column()</h2>	509	<h2·class="memtitle"><span·class="permalink"><a·href="#a0cc2133611f007e7390988f6110245c8">◆ </a></span>table_column()</h2>

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./usr/share/doc/libpqxx-doc/doxygen-html/classpqxx_1_1stream__from.html ¶


Offset 209, 15 lines modified		Offset 209, 15 lines modified
209	<tr·class="separator:a14aff60d791c45b09f8c424c03a26e45"><td·class="memSeparator"·colspan="2"> </td></tr>	209	<tr·class="separator:a14aff60d791c45b09f8c424c03a26e45"><td·class="memSeparator"·colspan="2"> </td></tr>
210	<tr·class="memitem:a8bd03db93560766414f74258202f86fd"·id="r_a8bd03db93560766414f74258202f86fd"><td·class="memItemLeft"·align="right"·valign="top">static·<a·class="el"·href="classpqxx_1_1stream__from.html">stream_from</a> </td><td·class="memItemRight"·valign="bottom"><a·class="el"·href="classpqxx_1_1stream__from.html#a8bd03db93560766414f74258202f86fd">table</a>·(<a·class="el"·href="group__transactions.html#classpqxx_1_1transaction__base">transaction_base</a>·&tx,·<a·class="el"·href="namespacepqxx.html#a7f913d1e427c805856ac303db75c1e57">table_path</a>·path,·std::initializer_list<·std::string_view·>·columns={})</td></tr>	210	<tr·class="memitem:a8bd03db93560766414f74258202f86fd"·id="r_a8bd03db93560766414f74258202f86fd"><td·class="memItemLeft"·align="right"·valign="top">static·<a·class="el"·href="classpqxx_1_1stream__from.html">stream_from</a> </td><td·class="memItemRight"·valign="bottom"><a·class="el"·href="classpqxx_1_1stream__from.html#a8bd03db93560766414f74258202f86fd">table</a>·(<a·class="el"·href="group__transactions.html#classpqxx_1_1transaction__base">transaction_base</a>·&tx,·<a·class="el"·href="namespacepqxx.html#a7f913d1e427c805856ac303db75c1e57">table_path</a>·path,·std::initializer_list<·std::string_view·>·columns={})</td></tr>
211	<tr·class="memdesc:a8bd03db93560766414f74258202f86fd"><td·class="mdescLeft"> </td><td·class="mdescRight">Factory:·Stream·data·from·a·given·table.··<br·/></td></tr>	211	<tr·class="memdesc:a8bd03db93560766414f74258202f86fd"><td·class="mdescLeft"> </td><td·class="mdescRight">Factory:·Stream·data·from·a·given·table.··<br·/></td></tr>
212	<tr·class="separator:a8bd03db93560766414f74258202f86fd"><td·class="memSeparator"·colspan="2"> </td></tr>	212	<tr·class="separator:a8bd03db93560766414f74258202f86fd"><td·class="memSeparator"·colspan="2"> </td></tr>
213	</table>	213	</table>
214	<a·name="details"·id="details"></a><h2·class="groupheader">Detailed·Description</h2>	214	<a·name="details"·id="details"></a><h2·class="groupheader">Detailed·Description</h2>
215	<div·class="textblock"><p>Stream·data·from·the·database.·</p>	215	<div·class="textblock"><p>Stream·data·from·the·database.·</p>
216	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000020">Deprecated:</a></b></dt><dd>Use·<a·class="el"·href="group__transactions.html#aec4d0f102c2c0fab8fa1a48f452abc0f">transaction_base::stream</a>.</dd></dl>	216	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000018">Deprecated:</a></b></dt><dd>Use·<a·class="el"·href="group__transactions.html#aec4d0f102c2c0fab8fa1a48f452abc0f">transaction_base::stream</a>.</dd></dl>
217	<p>For·larger·data·sets,·retrieving·data·this·way·is·likely·to·be·faster·than·executing·a·query·and·then·iterating·and·converting·the·rows·fields.·You·will·also·be·able·to·start·processing·before·all·of·the·data·has·come·in.</p>	217	<p>For·larger·data·sets,·retrieving·data·this·way·is·likely·to·be·faster·than·executing·a·query·and·then·iterating·and·converting·the·rows·fields.·You·will·also·be·able·to·start·processing·before·all·of·the·data·has·come·in.</p>
218	<p>There·are·also·downsides.·Not·all·kinds·of·query·will·work·in·a·stream.·But·straightforward·<code>SELECT</code>·and·<code>UPDATE·...·RETURNING</code>·queries·should·work.·This·function·makes·use·of·<a·class="el"·href="classpqxx_1_1stream__from.html">pqxx::stream_from</a>,·which·in·turn·uses·PostgreSQL's·<code>COPY</code>·command,·so·see·the·documentation·for·those·to·get·the·full·details.</p>	218	<p>There·are·also·downsides.·Not·all·kinds·of·query·will·work·in·a·stream.·But·straightforward·<code>SELECT</code>·and·<code>UPDATE·...·RETURNING</code>·queries·should·work.·This·function·makes·use·of·<a·class="el"·href="classpqxx_1_1stream__from.html">pqxx::stream_from</a>,·which·in·turn·uses·PostgreSQL's·<code>COPY</code>·command,·so·see·the·documentation·for·those·to·get·the·full·details.</p>
219	<p>There·are·other·downsides.·If·there·stream·encounters·an·error,·it·may·leave·the·entire·connection·in·an·unusable·state,·so·you'll·have·to·give·the·whole·thing·up.·Finally,·opening·a·stream·puts·the·connection·in·a·special·state,·so·you·won't·be·able·to·do·many·other·things·with·the·connection·or·the·transaction·while·the·stream·is·open.</p>	219	<p>There·are·other·downsides.·If·there·stream·encounters·an·error,·it·may·leave·the·entire·connection·in·an·unusable·state,·so·you'll·have·to·give·the·whole·thing·up.·Finally,·opening·a·stream·puts·the·connection·in·a·special·state,·so·you·won't·be·able·to·do·many·other·things·with·the·connection·or·the·transaction·while·the·stream·is·open.</p>
220	<p>There·are·two·ways·of·starting·a·stream:·you·stream·either·all·rows·in·a·table·(using·one·of·the·factories,·<code><a·class="el"·href="classpqxx_1_1stream__from.html#a8bd03db93560766414f74258202f86fd"·title="Factory:·Stream·data·from·a·given·table.">table()</a></code>·or·<code><a·class="el"·href="classpqxx_1_1stream__from.html#a14aff60d791c45b09f8c424c03a26e45"·title="Factory:·Stream·data·from·a·pre-quoted·table·and·columns.">raw_table()</a></code>),·or·the·results·of·a·query·(using·the·<code><a·class="el"·href="classpqxx_1_1stream__from.html#a062c20b73f6c9d019bfc35806c432ec0"·title="Factory:·Execute·query,·and·stream·the·results.">query()</a></code>·factory).</p>	220	<p>There·are·two·ways·of·starting·a·stream:·you·stream·either·all·rows·in·a·table·(using·one·of·the·factories,·<code><a·class="el"·href="classpqxx_1_1stream__from.html#a8bd03db93560766414f74258202f86fd"·title="Factory:·Stream·data·from·a·given·table.">table()</a></code>·or·<code><a·class="el"·href="classpqxx_1_1stream__from.html#a14aff60d791c45b09f8c424c03a26e45"·title="Factory:·Stream·data·from·a·pre-quoted·table·and·columns.">raw_table()</a></code>),·or·the·results·of·a·query·(using·the·<code><a·class="el"·href="classpqxx_1_1stream__from.html#a062c20b73f6c9d019bfc35806c432ec0"·title="Factory:·Execute·query,·and·stream·the·results.">query()</a></code>·factory).</p>
221	<p>Usually·you'll·want·the·<code>stream</code>·convenience·wrapper·in·<a·class="el"·href="group__transactions.html">transaction_base</a>,·*·so·you·don't·need·to·deal·with·this·class·directly.</p>	221	<p>Usually·you'll·want·the·<code>stream</code>·convenience·wrapper·in·<a·class="el"·href="group__transactions.html">transaction_base</a>,·*·so·you·don't·need·to·deal·with·this·class·directly.</p>
222	<dl·class="section·warning"><dt>Warning</dt><dd>While·a·stream·is·active,·you·cannot·execute·queries,·open·a·pipeline,·etc.·on·the·same·transaction.·A·transaction·can·have·at·most·one·object·of·a·type·derived·from·<a·class="el"·href="classpqxx_1_1transaction__focus.html">pqxx::transaction_focus</a>·active·on·it·at·a·time.·</dd></dl>	222	<dl·class="section·warning"><dt>Warning</dt><dd>While·a·stream·is·active,·you·cannot·execute·queries,·open·a·pipeline,·etc.·on·the·same·transaction.·A·transaction·can·have·at·most·one·object·of·a·type·derived·from·<a·class="el"·href="classpqxx_1_1transaction__focus.html">pqxx::transaction_focus</a>·active·on·it·at·a·time.·</dd></dl>
223	</div><h2·class="groupheader">Constructor·&·Destructor·Documentation</h2>	223	</div><h2·class="groupheader">Constructor·&·Destructor·Documentation</h2>
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250	··········<td>)</td>	250	··········<td>)</td>
251	··········<td></td><td></td>	251	··········<td></td><td></td>
252	········</tr>	252	········</tr>
253	······</table>	253	······</table>
254	</div><div·class="memdoc">	254	</div><div·class="memdoc">

255	<p>Execute·query,·and·stream·over·the·results.·</p>	255	<p>Execute·query,·and·stream·over·the·results.·</p>
256	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000021">Deprecated:</a></b></dt><dd>Use·factory·function·<a·class="el"·href="classpqxx_1_1stream__from.html#a062c20b73f6c9d019bfc35806c432ec0">query</a>·instead.·</dd></dl>	256	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000019">Deprecated:</a></b></dt><dd>Use·factory·function·<a·class="el"·href="classpqxx_1_1stream__from.html#a062c20b73f6c9d019bfc35806c432ec0">query</a>·instead.·</dd></dl>

257	</div>	257	</div>
258	</div>	258	</div>
259	<a·id="a3c4cd42c50e3e90282ea5570ddb19e70"·name="a3c4cd42c50e3e90282ea5570ddb19e70"></a>	259	<a·id="a3c4cd42c50e3e90282ea5570ddb19e70"·name="a3c4cd42c50e3e90282ea5570ddb19e70"></a>
260	<h2·class="memtitle"><span·class="permalink"><a·href="#a3c4cd42c50e3e90282ea5570ddb19e70">◆ </a></span>stream_from()·<span·class="overload">[2/7]</span></h2>	260	<h2·class="memtitle"><span·class="permalink"><a·href="#a3c4cd42c50e3e90282ea5570ddb19e70">◆ </a></span>stream_from()·<span·class="overload">[2/7]</span></h2>

261	<div·class="memitem">	261	<div·class="memitem">
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287	··········<td>)</td>	287	··········<td>)</td>
288	··········<td></td><td></td>	288	··········<td></td><td></td>
289	········</tr>	289	········</tr>
290	······</table>	290	······</table>
291	</div><div·class="memdoc">	291	</div><div·class="memdoc">

292	<p>Stream·all·rows·in·table,·all·columns.·</p>	292	<p>Stream·all·rows·in·table,·all·columns.·</p>
293	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000022">Deprecated:</a></b></dt><dd>Use·factories·<a·class="el"·href="classpqxx_1_1stream__from.html#a8bd03db93560766414f74258202f86fd">table</a>·or·<a·class="el"·href="classpqxx_1_1stream__from.html#a14aff60d791c45b09f8c424c03a26e45">raw_table</a>·instead.·</dd></dl>	293	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000020">Deprecated:</a></b></dt><dd>Use·factories·<a·class="el"·href="classpqxx_1_1stream__from.html#a8bd03db93560766414f74258202f86fd">table</a>·or·<a·class="el"·href="classpqxx_1_1stream__from.html#a14aff60d791c45b09f8c424c03a26e45">raw_table</a>·instead.·</dd></dl>

294	</div>	294	</div>
295	</div>	295	</div>
296	<a·id="a0f32402331d7f2b8ed73419f1eed22ba"·name="a0f32402331d7f2b8ed73419f1eed22ba"></a>	296	<a·id="a0f32402331d7f2b8ed73419f1eed22ba"·name="a0f32402331d7f2b8ed73419f1eed22ba"></a>
297	<h2·class="memtitle"><span·class="permalink"><a·href="#a0f32402331d7f2b8ed73419f1eed22ba">◆ </a></span>stream_from()·<span·class="overload">[3/7]</span></h2>	297	<h2·class="memtitle"><span·class="permalink"><a·href="#a0f32402331d7f2b8ed73419f1eed22ba">◆ </a></span>stream_from()·<span·class="overload">[3/7]</span></h2>

298	<div·class="memitem">	298	<div·class="memitem">
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346	··<td·class="mlabels-right">	346	··<td·class="mlabels-right">
347	<span·class="mlabels"><span·class="mlabel">inline</span></span>··</td>	347	<span·class="mlabels"><span·class="mlabel">inline</span></span>··</td>
348	··</tr>	348	··</tr>
349	</table>	349	</table>
350	</div><div·class="memdoc">	350	</div><div·class="memdoc">

351	<p>Stream·given·columns·from·all·rows·in·table.·</p>	351	<p>Stream·given·columns·from·all·rows·in·table.·</p>
352	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000023">Deprecated:</a></b></dt><dd>Use·factories·<a·class="el"·href="classpqxx_1_1stream__from.html#a8bd03db93560766414f74258202f86fd">table</a>·or·<a·class="el"·href="classpqxx_1_1stream__from.html#a14aff60d791c45b09f8c424c03a26e45">raw_table</a>·instead.·</dd></dl>	352	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000021">Deprecated:</a></b></dt><dd>Use·factories·<a·class="el"·href="classpqxx_1_1stream__from.html#a8bd03db93560766414f74258202f86fd">table</a>·or·<a·class="el"·href="classpqxx_1_1stream__from.html#a14aff60d791c45b09f8c424c03a26e45">raw_table</a>·instead.·</dd></dl>

353	</div>	353	</div>
354	</div>	354	</div>
355	<a·id="a832fe2b217cf7e1a5496d35f75dcd15c"·name="a832fe2b217cf7e1a5496d35f75dcd15c"></a>	355	<a·id="a832fe2b217cf7e1a5496d35f75dcd15c"·name="a832fe2b217cf7e1a5496d35f75dcd15c"></a>
356	<h2·class="memtitle"><span·class="permalink"><a·href="#a832fe2b217cf7e1a5496d35f75dcd15c">◆ </a></span>stream_from()·<span·class="overload">[4/7]</span></h2>	356	<h2·class="memtitle"><span·class="permalink"><a·href="#a832fe2b217cf7e1a5496d35f75dcd15c">◆ </a></span>stream_from()·<span·class="overload">[4/7]</span></h2>

357	<div·class="memitem">	357	<div·class="memitem">
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399	··<td·class="mlabels-right">	399	··<td·class="mlabels-right">
400	<span·class="mlabels"><span·class="mlabel">inline</span></span>··</td>	400	<span·class="mlabels"><span·class="mlabel">inline</span></span>··</td>
401	··</tr>	401	··</tr>
402	</table>	402	</table>
403	</div><div·class="memdoc">	403	</div><div·class="memdoc">

404	<p>Stream·given·columns·from·all·rows·in·table.·</p>	404	<p>Stream·given·columns·from·all·rows·in·table.·</p>
405	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000024">Deprecated:</a></b></dt><dd>Use·factory·function·<a·class="el"·href="classpqxx_1_1stream__from.html#a062c20b73f6c9d019bfc35806c432ec0">query</a>·instead.·</dd></dl>	405	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000022">Deprecated:</a></b></dt><dd>Use·factory·function·<a·class="el"·href="classpqxx_1_1stream__from.html#a062c20b73f6c9d019bfc35806c432ec0">query</a>·instead.·</dd></dl>

406	</div>	406	</div>
407	</div>	407	</div>
408	<a·id="abcfe96b18d9e2c4177799248fe143807"·name="abcfe96b18d9e2c4177799248fe143807"></a>	408	<a·id="abcfe96b18d9e2c4177799248fe143807"·name="abcfe96b18d9e2c4177799248fe143807"></a>
409	<h2·class="memtitle"><span·class="permalink"><a·href="#abcfe96b18d9e2c4177799248fe143807">◆ </a></span>stream_from()·<span·class="overload">[5/7]</span></h2>	409	<h2·class="memtitle"><span·class="permalink"><a·href="#abcfe96b18d9e2c4177799248fe143807">◆ </a></span>stream_from()·<span·class="overload">[5/7]</span></h2>

410	<div·class="memitem">	410	<div·class="memitem">
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437	··</td>	437	··</td>
438	··<td·class="mlabels-right">	438	··<td·class="mlabels-right">
439	<span·class="mlabels"><span·class="mlabel">inline</span></span>··</td>	439	<span·class="mlabels"><span·class="mlabel">inline</span></span>··</td>
440	··</tr>	440	··</tr>
441	</table>	441	</table>
442	</div><div·class="memdoc">	442	</div><div·class="memdoc">
443	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000025">Deprecated:</a></b></dt><dd>Use·factories·<a·class="el"·href="classpqxx_1_1stream__from.html#a8bd03db93560766414f74258202f86fd">table</a>·or·<a·class="el"·href="classpqxx_1_1stream__from.html#a14aff60d791c45b09f8c424c03a26e45">raw_table</a>·instead.·</dd></dl>	443	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000023">Deprecated:</a></b></dt><dd>Use·factories·<a·class="el"·href="classpqxx_1_1stream__from.html#a8bd03db93560766414f74258202f86fd">table</a>·or·<a·class="el"·href="classpqxx_1_1stream__from.html#a14aff60d791c45b09f8c424c03a26e45">raw_table</a>·instead.·</dd></dl>

444	</div>	444	</div>
445	</div>	445	</div>
446	<a·id="a38b17b7198ed153d01e42d5873cdf070"·name="a38b17b7198ed153d01e42d5873cdf070"></a>	446	<a·id="a38b17b7198ed153d01e42d5873cdf070"·name="a38b17b7198ed153d01e42d5873cdf070"></a>
447	<h2·class="memtitle"><span·class="permalink"><a·href="#a38b17b7198ed153d01e42d5873cdf070">◆ </a></span>stream_from()·<span·class="overload">[6/7]</span></h2>	447	<h2·class="memtitle"><span·class="permalink"><a·href="#a38b17b7198ed153d01e42d5873cdf070">◆ </a></span>stream_from()·<span·class="overload">[6/7]</span></h2>

448	<div·class="memitem">	448	<div·class="memitem">
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481	······</table>	481	······</table>
482	··</td>	482	··</td>
483	··<td·class="mlabels-right">	483	··<td·class="mlabels-right">
484	<span·class="mlabels"><span·class="mlabel">inline</span></span>··</td>	484	<span·class="mlabels"><span·class="mlabel">inline</span></span>··</td>
485	··</tr>	485	··</tr>
486	</table>	486	</table>
487	</div><div·class="memdoc">	487	</div><div·class="memdoc">
488	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000026">Deprecated:</a></b></dt><dd>Use·factories·<a·class="el"·href="classpqxx_1_1stream__from.html#a8bd03db93560766414f74258202f86fd">table</a>·or·<a·class="el"·href="classpqxx_1_1stream__from.html#a14aff60d791c45b09f8c424c03a26e45">raw_table</a>·instead.·</dd></dl>	488	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000024">Deprecated:</a></b></dt><dd>Use·factories·<a·class="el"·href="classpqxx_1_1stream__from.html#a8bd03db93560766414f74258202f86fd">table</a>·or·<a·class="el"·href="classpqxx_1_1stream__from.html#a14aff60d791c45b09f8c424c03a26e45">raw_table</a>·instead.·</dd></dl>

489	</div>	489	</div>
490	</div>	490	</div>
491	<a·id="a6afe5f8cdb8f158b46fa9c616c7864bf"·name="a6afe5f8cdb8f158b46fa9c616c7864bf"></a>	491	<a·id="a6afe5f8cdb8f158b46fa9c616c7864bf"·name="a6afe5f8cdb8f158b46fa9c616c7864bf"></a>
492	<h2·class="memtitle"><span·class="permalink"><a·href="#a6afe5f8cdb8f158b46fa9c616c7864bf">◆ </a></span>stream_from()·<span·class="overload">[7/7]</span></h2>	492	<h2·class="memtitle"><span·class="permalink"><a·href="#a6afe5f8cdb8f158b46fa9c616c7864bf">◆ </a></span>stream_from()·<span·class="overload">[7/7]</span></h2>

493	<div·class="memitem">	493	<div·class="memitem">
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525	··········<td></td>	525	··········<td></td>
526	··········<td>)</td>	526	··········<td>)</td>
527	··········<td></td><td></td>	527	··········<td></td><td></td>
528	········</tr>	528	········</tr>
529	······</table>	529	······</table>
530	</div><div·class="memdoc">	530	</div><div·class="memdoc">
531	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000027">Deprecated:</a></b></dt><dd>Use·factories·<a·class="el"·href="classpqxx_1_1stream__from.html#a8bd03db93560766414f74258202f86fd">table</a>·or·<a·class="el"·href="classpqxx_1_1stream__from.html#a14aff60d791c45b09f8c424c03a26e45">raw_table</a>·instead.·</dd></dl>	531	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000025">Deprecated:</a></b></dt><dd>Use·factories·<a·class="el"·href="classpqxx_1_1stream__from.html#a8bd03db93560766414f74258202f86fd">table</a>·or·<a·class="el"·href="classpqxx_1_1stream__from.html#a14aff60d791c45b09f8c424c03a26e45">raw_table</a>·instead.·</dd></dl>

532	</div>	532	</div>
533	</div>	533	</div>
534	<h2·class="groupheader">Member·Function·Documentation</h2>	534	<h2·class="groupheader">Member·Function·Documentation</h2>
535	<a·id="a4720bea2f8cbff6d5e1d37f22dbc8a6d"·name="a4720bea2f8cbff6d5e1d37f22dbc8a6d"></a>	535	<a·id="a4720bea2f8cbff6d5e1d37f22dbc8a6d"·name="a4720bea2f8cbff6d5e1d37f22dbc8a6d"></a>
536	<h2·class="memtitle"><span·class="permalink"><a·href="#a4720bea2f8cbff6d5e1d37f22dbc8a6d">◆ </a></span>complete()</h2>	536	<h2·class="memtitle"><span·class="permalink"><a·href="#a4720bea2f8cbff6d5e1d37f22dbc8a6d">◆ </a></span>complete()</h2>

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219	<span·class="mlabels"><span·class="mlabel">inline</span></span>··</td>	219	<span·class="mlabels"><span·class="mlabel">inline</span></span>··</td>
220	··</tr>	220	··</tr>
221	</table>	221	</table>
222	</div><div·class="memdoc">	222	</div><div·class="memdoc">

223	<p>Create·a·stream,·without·specifying·columns.·</p>	223	<p>Create·a·stream,·without·specifying·columns.·</p>
224	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000033">Deprecated:</a></b></dt><dd>Use·<a·class="el"·href="classpqxx_1_1stream__to.html#a34d7ca93963c0b5733a9ebcc10f2429b">table</a>·or·<a·class="el"·href="classpqxx_1_1stream__to.html#a05279e61c463fb48a4182eea47f8f531">raw_table</a>·as·a·factory.</dd></dl>	224	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000040">Deprecated:</a></b></dt><dd>Use·<a·class="el"·href="classpqxx_1_1stream__to.html#a34d7ca93963c0b5733a9ebcc10f2429b">table</a>·or·<a·class="el"·href="classpqxx_1_1stream__to.html#a05279e61c463fb48a4182eea47f8f531">raw_table</a>·as·a·factory.</dd></dl>
225	<p>Fields·will·be·inserted·in·whatever·order·the·columns·have·in·the·database.</p>	225	<p>Fields·will·be·inserted·in·whatever·order·the·columns·have·in·the·database.</p>
226	<p>You'll·probably·want·to·specify·the·columns,·so·that·the·mapping·between·your·data·fields·and·the·table·is·explicit·in·your·code,·and·not·hidden·in·an·"implicit·contract"·between·your·code·and·your·schema.·</p>	226	<p>You'll·probably·want·to·specify·the·columns,·so·that·the·mapping·between·your·data·fields·and·the·table·is·explicit·in·your·code,·and·not·hidden·in·an·"implicit·contract"·between·your·code·and·your·schema.·</p>

227	</div>	227	</div>
228	</div>	228	</div>
229	<a·id="a3491f56118589adff7b7fc214689ad67"·name="a3491f56118589adff7b7fc214689ad67"></a>	229	<a·id="a3491f56118589adff7b7fc214689ad67"·name="a3491f56118589adff7b7fc214689ad67"></a>
230	<h2·class="memtitle"><span·class="permalink"><a·href="#a3491f56118589adff7b7fc214689ad67">◆ </a></span>stream_to()·<span·class="overload">[2/2]</span></h2>	230	<h2·class="memtitle"><span·class="permalink"><a·href="#a3491f56118589adff7b7fc214689ad67">◆ </a></span>stream_to()·<span·class="overload">[2/2]</span></h2>
Offset 267, 15 lines modified		Offset 267, 15 lines modified
267	··<td·class="mlabels-right">	267	··<td·class="mlabels-right">
268	<span·class="mlabels"><span·class="mlabel">inline</span></span>··</td>	268	<span·class="mlabels"><span·class="mlabel">inline</span></span>··</td>
269	··</tr>	269	··</tr>
270	</table>	270	</table>
271	</div><div·class="memdoc">	271	</div><div·class="memdoc">

272	<p>Create·a·stream,·specifying·column·names·as·a·container·of·strings.·</p>	272	<p>Create·a·stream,·specifying·column·names·as·a·container·of·strings.·</p>
273	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000034">Deprecated:</a></b></dt><dd>Use·<a·class="el"·href="classpqxx_1_1stream__to.html#a34d7ca93963c0b5733a9ebcc10f2429b">table</a>·or·<a·class="el"·href="classpqxx_1_1stream__to.html#a05279e61c463fb48a4182eea47f8f531">raw_table</a>·as·a·factory.·</dd></dl>	273	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000041">Deprecated:</a></b></dt><dd>Use·<a·class="el"·href="classpqxx_1_1stream__to.html#a34d7ca93963c0b5733a9ebcc10f2429b">table</a>·or·<a·class="el"·href="classpqxx_1_1stream__to.html#a05279e61c463fb48a4182eea47f8f531">raw_table</a>·as·a·factory.·</dd></dl>

274	</div>	274	</div>
275	</div>	275	</div>
276	<h2·class="groupheader">Member·Function·Documentation</h2>	276	<h2·class="groupheader">Member·Function·Documentation</h2>
277	<a·id="a6284b8a32d0841436e1761b449287788"·name="a6284b8a32d0841436e1761b449287788"></a>	277	<a·id="a6284b8a32d0841436e1761b449287788"·name="a6284b8a32d0841436e1761b449287788"></a>
278	<h2·class="memtitle"><span·class="permalink"><a·href="#a6284b8a32d0841436e1761b449287788">◆ </a></span>complete()</h2>	278	<h2·class="memtitle"><span·class="permalink"><a·href="#a6284b8a32d0841436e1761b449287788">◆ </a></span>complete()</h2>

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25.5 KB

./usr/share/doc/libpqxx-doc/doxygen-html/datatypes.html ¶

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28.6 KB

./usr/share/doc/libpqxx-doc/doxygen-html/deprecated.html ¶

⊟

4.31 KB

html2text {} ¶

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4.45 KB

./usr/share/doc/libpqxx-doc/doxygen-html/escaping.html ¶

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./usr/share/doc/libpqxx-doc/doxygen-html/namespacepqxx.html ¶


Offset 920, 15 lines modified		Offset 920, 15 lines modified
920	······<table·class="memname">	920	······<table·class="memname">
921	········<tr>	921	········<tr>
922	··········<td·class="memname">struct·pqxx::from_query_t</td>	922	··········<td·class="memname">struct·pqxx::from_query_t</td>
923	········</tr>	923	········</tr>
924	······</table>	924	······</table>
925	</div><div·class="memdoc">	925	</div><div·class="memdoc">
926	<div·class="textblock"><p>Marker·for·<a·class="el"·href="classpqxx_1_1stream__from.html">stream_from</a>·constructors:·"stream·from·query.".·</p>	926	<div·class="textblock"><p>Marker·for·<a·class="el"·href="classpqxx_1_1stream__from.html">stream_from</a>·constructors:·"stream·from·query.".·</p>
927	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000013">Deprecated:</a></b></dt><dd>Use·<a·class="el"·href="classpqxx_1_1stream__from.html#a062c20b73f6c9d019bfc35806c432ec0">stream_from::query()</a>·instead.·</dd></dl>	927	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000038">Deprecated:</a></b></dt><dd>Use·<a·class="el"·href="classpqxx_1_1stream__from.html#a062c20b73f6c9d019bfc35806c432ec0">stream_from::query()</a>·instead.·</dd></dl>
928	</div>	928	</div>
929	</div>	929	</div>
930	</div>	930	</div>
931	<a·name="structpqxx_1_1from__table__t"·id="structpqxx_1_1from__table__t"></a>	931	<a·name="structpqxx_1_1from__table__t"·id="structpqxx_1_1from__table__t"></a>
932	<h2·class="memtitle"><span·class="permalink"><a·href="#structpqxx_1_1from__table__t">◆ </a></span>pqxx::from_table_t</h2>	932	<h2·class="memtitle"><span·class="permalink"><a·href="#structpqxx_1_1from__table__t">◆ </a></span>pqxx::from_table_t</h2>

933	<div·class="memitem">	933	<div·class="memitem">
Offset 936, 15 lines modified		Offset 936, 15 lines modified
936	······<table·class="memname">	936	······<table·class="memname">
937	········<tr>	937	········<tr>
938	··········<td·class="memname">struct·pqxx::from_table_t</td>	938	··········<td·class="memname">struct·pqxx::from_table_t</td>
939	········</tr>	939	········</tr>
940	······</table>	940	······</table>
941	</div><div·class="memdoc">	941	</div><div·class="memdoc">
942	<div·class="textblock"><p>Marker·for·<a·class="el"·href="classpqxx_1_1stream__from.html">stream_from</a>·constructors:·"stream·from·table.".·</p>	942	<div·class="textblock"><p>Marker·for·<a·class="el"·href="classpqxx_1_1stream__from.html">stream_from</a>·constructors:·"stream·from·table.".·</p>
943	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000012">Deprecated:</a></b></dt><dd>Use·<a·class="el"·href="classpqxx_1_1stream__from.html#a8bd03db93560766414f74258202f86fd">stream_from::table()</a>·instead.·</dd></dl>	943	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000037">Deprecated:</a></b></dt><dd>Use·<a·class="el"·href="classpqxx_1_1stream__from.html#a8bd03db93560766414f74258202f86fd">stream_from::table()</a>·instead.·</dd></dl>
944	</div>	944	</div>
945	</div>	945	</div>
946	</div>	946	</div>
947	<a·name="structpqxx_1_1notification"·id="structpqxx_1_1notification"></a>	947	<a·name="structpqxx_1_1notification"·id="structpqxx_1_1notification"></a>
948	<h2·class="memtitle"><span·class="permalink"><a·href="#structpqxx_1_1notification">◆ </a></span>pqxx::notification</h2>	948	<h2·class="memtitle"><span·class="permalink"><a·href="#structpqxx_1_1notification">◆ </a></span>pqxx::notification</h2>

949	<div·class="memitem">	949	<div·class="memitem">
Offset 1073, 30 lines modified		Offset 1073, 30 lines modified
1073	<div·class="memproto">	1073	<div·class="memproto">
1074	······<table·class="memname">	1074	······<table·class="memname">
1075	········<tr>	1075	········<tr>
1076	··········<td·class="memname">using·<a·class="el"·href="namespacepqxx.html#a81df5de3c98b6a4ffe24530f37bb764d">pqxx::connection_base</a>·=·typedef·<a·class="el"·href="classpqxx_1_1connection.html">connection</a></td>	1076	··········<td·class="memname">using·<a·class="el"·href="namespacepqxx.html#a81df5de3c98b6a4ffe24530f37bb764d">pqxx::connection_base</a>·=·typedef·<a·class="el"·href="classpqxx_1_1connection.html">connection</a></td>
1077	········</tr>	1077	········</tr>
1078	······</table>	1078	······</table>
1079	</div><div·class="memdoc">	1079	</div><div·class="memdoc">
1080	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000030">Deprecated:</a></b></dt><dd>Old·base·class·for·connection.·They·are·now·the·same·class.·</dd></dl>	1080	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000034">Deprecated:</a></b></dt><dd>Old·base·class·for·connection.·They·are·now·the·same·class.·</dd></dl>

1081	</div>	1081	</div>
1082	</div>	1082	</div>
1083	<a·id="ac3b4a1e80160ee2d6fd623ad043e5416"·name="ac3b4a1e80160ee2d6fd623ad043e5416"></a>	1083	<a·id="ac3b4a1e80160ee2d6fd623ad043e5416"·name="ac3b4a1e80160ee2d6fd623ad043e5416"></a>
1084	<h2·class="memtitle"><span·class="permalink"><a·href="#ac3b4a1e80160ee2d6fd623ad043e5416">◆ </a></span>fieldstream</h2>	1084	<h2·class="memtitle"><span·class="permalink"><a·href="#ac3b4a1e80160ee2d6fd623ad043e5416">◆ </a></span>fieldstream</h2>

1085	<div·class="memitem">	1085	<div·class="memitem">
1086	<div·class="memproto">	1086	<div·class="memproto">
1087	······<table·class="memname">	1087	······<table·class="memname">
1088	········<tr>	1088	········<tr>
1089	··········<td·class="memname">using·<a·class="el"·href="namespacepqxx.html#ac3b4a1e80160ee2d6fd623ad043e5416">pqxx::fieldstream</a>·=·typedef·<a·class="el"·href="classpqxx_1_1basic__fieldstream.html">basic_fieldstream</a><char></td>	1089	··········<td·class="memname">using·<a·class="el"·href="namespacepqxx.html#ac3b4a1e80160ee2d6fd623ad043e5416">pqxx::fieldstream</a>·=·typedef·<a·class="el"·href="classpqxx_1_1basic__fieldstream.html">basic_fieldstream</a><char></td>
1090	········</tr>	1090	········</tr>
1091	······</table>	1091	······</table>
1092	</div><div·class="memdoc">	1092	</div><div·class="memdoc">
1093	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000015">Deprecated:</a></b></dt><dd>Read·a·field·using·<code><a·class="el"·href="classpqxx_1_1field.html#a27f7bb2fe7bd70412feaea0bdcd6464e"·title="Return·value·as·object·of·given·type,·or·default·value·if·null.">field::as</a><...>()</code>·or·<code><a·class="el"·href="classpqxx_1_1field.html#a7792842d762cff5c2dfe20c20e912042"·title="Read·as·plain·C·string.">field::c_str()</a></code>.·</dd></dl>	1093	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000007">Deprecated:</a></b></dt><dd>Read·a·field·using·<code><a·class="el"·href="classpqxx_1_1field.html#a27f7bb2fe7bd70412feaea0bdcd6464e"·title="Return·value·as·object·of·given·type,·or·default·value·if·null.">field::as</a><...>()</code>·or·<code><a·class="el"·href="classpqxx_1_1field.html#a7792842d762cff5c2dfe20c20e912042"·title="Read·as·plain·C·string.">field::c_str()</a></code>.·</dd></dl>

1094	</div>	1094	</div>
1095	</div>	1095	</div>
1096	<a·id="a316a1521470224aad07d24109ff0043d"·name="a316a1521470224aad07d24109ff0043d"></a>	1096	<a·id="a316a1521470224aad07d24109ff0043d"·name="a316a1521470224aad07d24109ff0043d"></a>
1097	<h2·class="memtitle"><span·class="permalink"><a·href="#a316a1521470224aad07d24109ff0043d">◆ </a></span>strip_t</h2>	1097	<h2·class="memtitle"><span·class="permalink"><a·href="#a316a1521470224aad07d24109ff0043d">◆ </a></span>strip_t</h2>

1098	<div·class="memitem">	1098	<div·class="memitem">
Offset 1107, 15 lines modified		Offset 1107, 15 lines modified
1107	········<tr>	1107	········<tr>
1108	··········<td·class="memname">using·<a·class="el"·href="namespacepqxx.html#a316a1521470224aad07d24109ff0043d">pqxx::strip_t</a>·=·typedef·std::remove_cv_t<std::remove_reference_t<TYPE>·></td>	1108	··········<td·class="memname">using·<a·class="el"·href="namespacepqxx.html#a316a1521470224aad07d24109ff0043d">pqxx::strip_t</a>·=·typedef·std::remove_cv_t<std::remove_reference_t<TYPE>·></td>
1109	········</tr>	1109	········</tr>
1110	······</table>	1110	······</table>
1111	</div><div·class="memdoc">	1111	</div><div·class="memdoc">

1112	<p>Remove·any·constness,·volatile,·and·reference-ness·from·a·type.·</p>	1112	<p>Remove·any·constness,·volatile,·and·reference-ness·from·a·type.·</p>
1113	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000011">Deprecated:</a></b></dt><dd>In·C++20·we'll·replace·this·with·std::remove_cvref.·</dd></dl>	1113	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000033">Deprecated:</a></b></dt><dd>In·C++20·we'll·replace·this·with·std::remove_cvref.·</dd></dl>

1114	</div>	1114	</div>
1115	</div>	1115	</div>
1116	<a·id="a7f913d1e427c805856ac303db75c1e57"·name="a7f913d1e427c805856ac303db75c1e57"></a>	1116	<a·id="a7f913d1e427c805856ac303db75c1e57"·name="a7f913d1e427c805856ac303db75c1e57"></a>
1117	<h2·class="memtitle"><span·class="permalink"><a·href="#a7f913d1e427c805856ac303db75c1e57">◆ </a></span>table_path</h2>	1117	<h2·class="memtitle"><span·class="permalink"><a·href="#a7f913d1e427c805856ac303db75c1e57">◆ </a></span>table_path</h2>

1118	<div·class="memitem">	1118	<div·class="memitem">
Offset 1486, 15 lines modified		Offset 1486, 15 lines modified
1486	··········<td>)</td>	1486	··········<td>)</td>
1487	··········<td></td><td></td>	1487	··········<td></td><td></td>
1488	········</tr>	1488	········</tr>
1489	······</table>	1489	······</table>
1490	</div><div·class="memdoc">	1490	</div><div·class="memdoc">

1491	<p>Encrypt·a·password.·</p>	1491	<p>Encrypt·a·password.·</p>
1492	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000031">Deprecated:</a></b></dt><dd>Use·<a·class="el"·href="classpqxx_1_1connection.html#a0724de6ed0e9b65267967adaa34c4f78"·title="Encrypt·a·password·for·a·given·user.">connection::encrypt_password</a>·instead.·</dd></dl>	1492	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000035">Deprecated:</a></b></dt><dd>Use·<a·class="el"·href="classpqxx_1_1connection.html#a0724de6ed0e9b65267967adaa34c4f78"·title="Encrypt·a·password·for·a·given·user.">connection::encrypt_password</a>·instead.·</dd></dl>

1493	</div>	1493	</div>
1494	</div>	1494	</div>
1495	<a·id="a204a7f521845d2fa16035b60eab9ddbb"·name="a204a7f521845d2fa16035b60eab9ddbb"></a>	1495	<a·id="a204a7f521845d2fa16035b60eab9ddbb"·name="a204a7f521845d2fa16035b60eab9ddbb"></a>
1496	<h2·class="memtitle"><span·class="permalink"><a·href="#a204a7f521845d2fa16035b60eab9ddbb">◆ </a></span>encrypt_password()·<span·class="overload">[2/2]</span></h2>	1496	<h2·class="memtitle"><span·class="permalink"><a·href="#a204a7f521845d2fa16035b60eab9ddbb">◆ </a></span>encrypt_password()·<span·class="overload">[2/2]</span></h2>

1497	<div·class="memitem">	1497	<div·class="memitem">
Offset 1525, 15 lines modified		Offset 1525, 15 lines modified
1525	··<td·class="mlabels-right">	1525	··<td·class="mlabels-right">
1526	<span·class="mlabels"><span·class="mlabel">inline</span></span>··</td>	1526	<span·class="mlabels"><span·class="mlabel">inline</span></span>··</td>
1527	··</tr>	1527	··</tr>
1528	</table>	1528	</table>
1529	</div><div·class="memdoc">	1529	</div><div·class="memdoc">

1530	<p>Encrypt·password.·</p>	1530	<p>Encrypt·password.·</p>
1531	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000032">Deprecated:</a></b></dt><dd>Use·<a·class="el"·href="classpqxx_1_1connection.html#a0724de6ed0e9b65267967adaa34c4f78"·title="Encrypt·a·password·for·a·given·user.">connection::encrypt_password</a>·instead.·</dd></dl>	1531	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000036">Deprecated:</a></b></dt><dd>Use·<a·class="el"·href="classpqxx_1_1connection.html#a0724de6ed0e9b65267967adaa34c4f78"·title="Encrypt·a·password·for·a·given·user.">connection::encrypt_password</a>·instead.·</dd></dl>

1532	</div>	1532	</div>
1533	</div>	1533	</div>
1534	<a·id="ae3697fd4a0fc1fcdb40937e16e1ec878"·name="ae3697fd4a0fc1fcdb40937e16e1ec878"></a>	1534	<a·id="ae3697fd4a0fc1fcdb40937e16e1ec878"·name="ae3697fd4a0fc1fcdb40937e16e1ec878"></a>
1535	<h2·class="memtitle"><span·class="permalink"><a·href="#ae3697fd4a0fc1fcdb40937e16e1ec878">◆ </a></span>from_string()</h2>	1535	<h2·class="memtitle"><span·class="permalink"><a·href="#ae3697fd4a0fc1fcdb40937e16e1ec878">◆ </a></span>from_string()</h2>

1536	<div·class="memitem">	1536	<div·class="memitem">
Offset 1701, 15 lines modified		Offset 1701, 15 lines modified
1701	··<td·class="mlabels-right">	1701	··<td·class="mlabels-right">
1702	<span·class="mlabels"><span·class="mlabel">inline</span></span>··</td>	1702	<span·class="mlabels"><span·class="mlabel">inline</span></span>··</td>
1703	··</tr>	1703	··</tr>
1704	</table>	1704	</table>
1705	</div><div·class="memdoc">	1705	</div><div·class="memdoc">

1706	<p>Write·a·result·field·to·any·type·of·stream.·</p>	1706	<p>Write·a·result·field·to·any·type·of·stream.·</p>
1707	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000016">Deprecated:</a></b></dt><dd>The·C++·streams·library·is·not·great·to·work·with.·In·particular,·error·handling·is·easy·to·get·wrong.·So·you're·probably·better·off·doing·this·by·hand.</dd></dl>	1707	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000008">Deprecated:</a></b></dt><dd>The·C++·streams·library·is·not·great·to·work·with.·In·particular,·error·handling·is·easy·to·get·wrong.·So·you're·probably·better·off·doing·this·by·hand.</dd></dl>
1708	<p>This·can·be·convenient·when·writing·a·field·to·an·output·stream.·More·importantly,·it·lets·you·write·a·field·to·e.g.·a·<code>stringstream</code>·which·you·can·then·use·to·read,·format·and·convert·the·field·in·ways·that·to()·does·not·support.</p>	1708	<p>This·can·be·convenient·when·writing·a·field·to·an·output·stream.·More·importantly,·it·lets·you·write·a·field·to·e.g.·a·<code>stringstream</code>·which·you·can·then·use·to·read,·format·and·convert·the·field·in·ways·that·to()·does·not·support.</p>
1709	<p>Example:·parse·a·field·into·a·variable·of·the·nonstandard·<code>long·long</code>·type.</p>	1709	<p>Example:·parse·a·field·into·a·variable·of·the·nonstandard·<code>long·long</code>·type.</p>
1710	<div·class="fragment"><div·class="line"><span·class="keyword">extern</span>·<a·class="code·hl_class"·href="classpqxx_1_1result.html">result</a>·R;</div>	1710	<div·class="fragment"><div·class="line"><span·class="keyword">extern</span>·<a·class="code·hl_class"·href="classpqxx_1_1result.html">result</a>·R;</div>
1711	<div·class="line"><span·class="keywordtype">long</span>·<span·class="keywordtype">long</span>·L;</div>	1711	<div·class="line"><span·class="keywordtype">long</span>·<span·class="keywordtype">long</span>·L;</div>
1712	<div·class="line">stringstream·S;</div>	1712	<div·class="line">stringstream·S;</div>
1713	<div·class="line">·</div>	1713	<div·class="line">·</div>
1714	<div·class="line"><span·class="comment">//·Write·field's·string·into·S</span></div>	1714	<div·class="line"><span·class="comment">//·Write·field's·string·into·S</span></div>
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27	····['querying_20rows_20of_20data_7',·['Querying·rows·of·data',·['../accessing-results.html#autotoc_md13',·1,·'']]],	27	····['querying_20rows_20of_20data_7',·['Querying·rows·of·data',·['../accessing-results.html#autotoc_md26',·1,·'']]],
28	····['quiet_5ferrorhandler_8',·['quiet_errorhandler',·['../classpqxx_1_1quiet__errorhandler.html',·1,·'pqxx::quiet_errorhandler'],
29	········['../classpqxx_1_1quiet__errorhandler.html#ac89d9cb68e28649ed53ec9d00ad75550',·1,·'pqxx::quiet_errorhandler::quiet_errorhandler()']	28	····['quiet_5ferrorhandler_8',·['quiet_errorhandler',·['../classpqxx_1_1quiet__errorhandler.html#ac89d9cb68e28649ed53ec9d00ad75550',·1,·'pqxx::quiet_errorhandler::quiet_errorhandler()'],
		29	········['../classpqxx_1_1quiet__errorhandler.html',·1,·'pqxx::quiet_errorhandler']
30	····]],	30	····]],
		31	····['quote_9',·['quote',·['../classpqxx_1_1connection.html#aa8dd0b5e748b96a2c82152b8001bdc69',·1,·'pqxx::connection::quote()'],
31	····~~['quote_9',~~·~~['quote~~',·['../group__transactions.html#a6476b6d27bb27a6eb8767080cc3e6a49',·1,·'pqxx::transaction_base::quote()'],	32	········['../group__transactions.html#a6476b6d27bb27a6eb8767080cc3e6a49',·1,·'pqxx::transaction_base::quote()'],
32	········['../classpqxx_1_1connection.html#aa8dd0b5e748b96a2c82152b8001bdc69',·1,·'pqxx::connection::quote(bytes_view·bytes)·const'],
33	········['../classpqxx_1_1connection.html#ae871e3c436af0ed50e1373d9157e7340',·1,·'pqxx::connection::quote(T·const·&t)·const']	33	········['../classpqxx_1_1connection.html#ae871e3c436af0ed50e1373d9157e7340',·1,·'pqxx::connection::quote(T·const·&t)·const']
34	····]],	34	····]],
35	····['quote_5fcolumns_10',·['quote_columns',·['../classpqxx_1_1connection.html#a6f0d42562cf2e37c1673738bf330b2b7',·1,·'pqxx::connection']]],	35	····['quote_5fcolumns_10',·['quote_columns',·['../classpqxx_1_1connection.html#a6f0d42562cf2e37c1673738bf330b2b7',·1,·'pqxx::connection']]],
36	····['quote_5fname_11',·['quote_name',·['../classpqxx_1_1connection.html#a98f0397793e45b0ea2d9fa4e7a454167',·1,·'pqxx::connection::quote_name()'],	36	····['quote_5fname_11',·['quote_name',·['../classpqxx_1_1connection.html#a98f0397793e45b0ea2d9fa4e7a454167',·1,·'pqxx::connection::quote_name()'],
37	········['../group__transactions.html#ade6d268d6b59cd8684be5d127746d99f',·1,·'pqxx::transaction_base::quote_name()']	37	········['../group__transactions.html#ade6d268d6b59cd8684be5d127746d99f',·1,·'pqxx::transaction_base::quote_name()']
38	····]],	38	····]],
39	····['quote_5fraw_12',·['quote_raw',·['../classpqxx_1_1connection.html#a276b3fe0ae9d3cc8e5a04f5e9b2bf1cf',·1,·'pqxx::connection::quote_raw(bytes_view)·const'],	39	····['quote_5fraw_12',·['quote_raw',·['../classpqxx_1_1connection.html#a276b3fe0ae9d3cc8e5a04f5e9b2bf1cf',·1,·'pqxx::connection::quote_raw(bytes_view)·const'],

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./usr/share/doc/libpqxx-doc/doxygen-html/streams.html ¶


Offset 93, 38 lines modified		Offset 93, 38 lines modified
93	··<div·class="headertitle"><div·class="title">Accessing·results·and·result·rows</div></div>	93	··<div·class="headertitle"><div·class="title">Accessing·results·and·result·rows</div></div>
94	</div><!--header-->	94	</div><!--header-->
95	<div·class="contents">	95	<div·class="contents">
96	<div·class="textblock"><p>A·query·produces·a·result·set·consisting·of·rows,·and·each·row·consists·of·fields.·There·are·several·ways·to·receive·this·data.</p>	96	<div·class="textblock"><p>A·query·produces·a·result·set·consisting·of·rows,·and·each·row·consists·of·fields.·There·are·several·ways·to·receive·this·data.</p>
97	<p>The·fields·are·"untyped."·That·is·to·say,·libpqxx·has·no·opinion·on·what·their·types·are.·The·database·sends·the·data·in·a·very·flexible·textual·format.·When·you·read·a·field,·you·specify·what·type·you·want·it·to·be,·and·libpqxx·converts·the·text·format·to·that·type·for·you.</p>	97	<p>The·fields·are·"untyped."·That·is·to·say,·libpqxx·has·no·opinion·on·what·their·types·are.·The·database·sends·the·data·in·a·very·flexible·textual·format.·When·you·read·a·field,·you·specify·what·type·you·want·it·to·be,·and·libpqxx·converts·the·text·format·to·that·type·for·you.</p>
98	<p>If·a·value·does·not·conform·to·the·format·for·the·type·you·specify,·the·conversion·fails.·For·example,·if·you·have·strings·that·all·happen·to·contain·numbers,·you·can·read·them·as·<code>int</code>.·But·if·any·of·the·values·is·empty,·or·it's·null·(for·a·type·that·doesn't·support·null),·or·it's·some·string·that·does·not·look·like·an·integer,·or·it's·too·large,·you·can't·convert·it·to·<code>int</code>.</p>	98	<p>If·a·value·does·not·conform·to·the·format·for·the·type·you·specify,·the·conversion·fails.·For·example,·if·you·have·strings·that·all·happen·to·contain·numbers,·you·can·read·them·as·<code>int</code>.·But·if·any·of·the·values·is·empty,·or·it's·null·(for·a·type·that·doesn't·support·null),·or·it's·some·string·that·does·not·look·like·an·integer,·or·it's·too·large,·you·can't·convert·it·to·<code>int</code>.</p>
99	<p>So·usually,·reading·result·data·from·the·database·means·not·just·retrieving·the·data;·it·also·means·converting·it·to·some·target·type.</p>	99	<p>So·usually,·reading·result·data·from·the·database·means·not·just·retrieving·the·data;·it·also·means·converting·it·to·some·target·type.</p>
100	<h1><a·class="anchor"·id="autotoc_md13"></a>	100	<h1><a·class="anchor"·id="autotoc_md26"></a>
101	Querying·rows·of·data</h1>	101	Querying·rows·of·data</h1>
102	<p>The·simplest·way·to·query·rows·of·data·is·to·call·one·of·a·transaction's·"query"·functions,·passing·as·template·arguments·the·types·of·columns·you·want·to·get·back·(e.g.·<code>int</code>,·<code>std::string</code>,·<code>double</code>,·and·so·on)·and·as·a·regular·argument·the·query·itself.</p>	102	<p>The·simplest·way·to·query·rows·of·data·is·to·call·one·of·a·transaction's·"query"·functions,·passing·as·template·arguments·the·types·of·columns·you·want·to·get·back·(e.g.·<code>int</code>,·<code>std::string</code>,·<code>double</code>,·and·so·on)·and·as·a·regular·argument·the·query·itself.</p>
103	<p>You·can·then·iterate·over·the·result·to·go·over·the·rows·of·data:</p>	103	<p>You·can·then·iterate·over·the·result·to·go·over·the·rows·of·data:</p>
104	<div·class="fragment"><div·class="line"><span·class="keywordflow">for</span>·(<span·class="keyword">auto</span>·[<span·class="keywordtype">id</span>,·value]·:</div>	104	<div·class="fragment"><div·class="line"><span·class="keywordflow">for</span>·(<span·class="keyword">auto</span>·[<span·class="keywordtype">id</span>,·value]·:</div>
105	<div·class="line">····tx.query<int,·std::string>(<span·class="stringliteral">"SELECT·id,·name·FROM·item"</span>))</div>	105	<div·class="line">····tx.query<int,·std::string>(<span·class="stringliteral">"SELECT·id,·name·FROM·item"</span>))</div>
106	<div·class="line">{</div>	106	<div·class="line">{</div>
107	<div·class="line">····std::cout·<<·<span·class="keywordtype">id</span>·<<·<span·class="charliteral">'\t'</span>·<<·value·<<·<span·class="charliteral">'\n'</span>;</div>	107	<div·class="line">····std::cout·<<·<span·class="keywordtype">id</span>·<<·<span·class="charliteral">'\t'</span>·<<·value·<<·<span·class="charliteral">'\n'</span>;</div>
108	<div·class="line">}</div>	108	<div·class="line">}</div>
109	</div><!--·fragment·--><p>The·"query"·functions·execute·your·query,·load·the·complete·result·data·from·the·database,·and·then·as·you·iterate,·convert·each·row·it·received·to·a·tuple·of·C++·types·that·you·indicated.</p>	109	</div><!--·fragment·--><p>The·"query"·functions·execute·your·query,·load·the·complete·result·data·from·the·database,·and·then·as·you·iterate,·convert·each·row·it·received·to·a·tuple·of·C++·types·that·you·indicated.</p>
110	<p>There·are·different·query·functions·for·querying·any·number·of·rows·(<code>query()</code>);·querying·just·one·row·of·data·as·a·<code>std::tuple</code>·and·throwing·an·error·if·there's·more·than·one·row·(<code>query1()</code>);·or·querying</p>	110	<p>There·are·different·query·functions·for·querying·any·number·of·rows·(<code>query()</code>);·querying·just·one·row·of·data·as·a·<code>std::tuple</code>·and·throwing·an·error·if·there's·more·than·one·row·(<code>query1()</code>);·or·querying</p>
111	<h1><a·class="anchor"·id="autotoc_md14"></a>	111	<h1><a·class="anchor"·id="autotoc_md27"></a>
112	Streaming·rows</h1>	112	Streaming·rows</h1>
113	<p>There's·another·way·to·go·through·the·rows·coming·out·of·a·query.·It's·usually·easier·and·faster·if·there·are·a·lot·of·rows,·but·there·are·drawbacks.</p>	113	<p>There's·another·way·to·go·through·the·rows·coming·out·of·a·query.·It's·usually·easier·and·faster·if·there·are·a·lot·of·rows,·but·there·are·drawbacks.</p>
114	<p><b>One,</b>·you·start·getting·rows·before·all·the·data·has·come·in·from·the·database.·That·speeds·things·up,·but·what·happens·if·you·lose·your·network·connection·while·transferring·the·data?·Your·application·may·already·have·processed·some·of·the·data·before·finding·out·that·the·rest·isn't·coming.·If·that·is·a·problem·for·your·application,·streaming·may·not·be·the·right·choice.</p>	114	<p><b>One,</b>·you·start·getting·rows·before·all·the·data·has·come·in·from·the·database.·That·speeds·things·up,·but·what·happens·if·you·lose·your·network·connection·while·transferring·the·data?·Your·application·may·already·have·processed·some·of·the·data·before·finding·out·that·the·rest·isn't·coming.·If·that·is·a·problem·for·your·application,·streaming·may·not·be·the·right·choice.</p>
115	<p><b>Two,</b>·streaming·only·works·for·some·types·of·query.·The·<code>stream()</code>·function·wraps·your·query·in·a·PostgreSQL·<code>COPY</code>·command,·and·<code>COPY</code>·only·supports·a·few·commands:·<code>SELECT</code>,·<code>VALUES</code>,·or·an·<code>INSERT</code>,·<code>UPDATE</code>,·or·<code>DELETE</code>·with·a·<code>RETURNING</code>·clause.·See·the·<code>COPY</code>·documentation·here:·[·<a·href="https://www.postgresql.org/docs/current/sql-copy.html">https://www.postgresql.org/docs/current/sql-copy.html</a>·](<a·href="https://www.postgresql.org/docs/current/sql-copy.html">https://www.postgresql.org/docs/current/sql-copy.html</a>).</p>	115	<p><b>Two,</b>·streaming·only·works·for·some·types·of·query.·The·<code>stream()</code>·function·wraps·your·query·in·a·PostgreSQL·<code>COPY</code>·command,·and·<code>COPY</code>·only·supports·a·few·commands:·<code>SELECT</code>,·<code>VALUES</code>,·or·an·<code>INSERT</code>,·<code>UPDATE</code>,·or·<code>DELETE</code>·with·a·<code>RETURNING</code>·clause.·See·the·<code>COPY</code>·documentation·here:·[·<a·href="https://www.postgresql.org/docs/current/sql-copy.html">https://www.postgresql.org/docs/current/sql-copy.html</a>·](<a·href="https://www.postgresql.org/docs/current/sql-copy.html">https://www.postgresql.org/docs/current/sql-copy.html</a>).</p>
116	<p><b>Three,</b>·when·you·convert·a·field·to·a·"view"·type·(such·as·<code>std::string_view</code>·or·<code><a·class="el"·href="namespacepqxx.html#adf98e8b2ed585c586f9575928421e07d"·title="Type·alias·for·a·view·of·bytes.">pqxx::bytes_view</a></code>),·the·view·points·to·underlying·data·which·only·stays·valid·until·you·iterate·to·the·next·row·or·exit·the·loop.·So·if·you·want·to·use·that·data·for·longer·than·a·single·iteration·of·the·streaming·loop,·you'll·have·to·store·it·somewhere·yourself.</p>	116	<p><b>Three,</b>·when·you·convert·a·field·to·a·"view"·type·(such·as·<code>std::string_view</code>·or·<code><a·class="el"·href="namespacepqxx.html#adf98e8b2ed585c586f9575928421e07d"·title="Type·alias·for·a·view·of·bytes.">pqxx::bytes_view</a></code>),·the·view·points·to·underlying·data·which·only·stays·valid·until·you·iterate·to·the·next·row·or·exit·the·loop.·So·if·you·want·to·use·that·data·for·longer·than·a·single·iteration·of·the·streaming·loop,·you'll·have·to·store·it·somewhere·yourself.</p>
117	<p>Now·for·the·good·news.·Streaming·does·make·it·very·easy·to·query·data·and·loop·over·it,·and·often·faster·than·with·the·"query"·or·"exec"·functions:</p>	117	<p>Now·for·the·good·news.·Streaming·does·make·it·very·easy·to·query·data·and·loop·over·it,·and·often·faster·than·with·the·"query"·or·"exec"·functions:</p>
118	<div·class="fragment"><div·class="line"><span·class="keywordflow">for</span>·(<span·class="keyword">auto</span>·[<span·class="keywordtype">id</span>,·name,·x,·y]·:</div>	118	<div·class="fragment"><div·class="line"><span·class="keywordflow">for</span>·(<span·class="keyword">auto</span>·[<span·class="keywordtype">id</span>,·name,·x,·y]·:</div>
119	<div·class="line">····tx.stream<int,·std::string_view,·float,·float>(</div>	119	<div·class="line">····tx.stream<int,·std::string_view,·float,·float>(</div>
120	<div·class="line">········<span·class="stringliteral">"SELECT·id,·name,·x,·y·FROM·point"</span>))</div>	120	<div·class="line">········<span·class="stringliteral">"SELECT·id,·name,·x,·y·FROM·point"</span>))</div>
121	<div·class="line">··process(id·+·1,·<span·class="stringliteral">"point-"</span>·+·name,·x··10.0,·y··10.0);</div>	121	<div·class="line">··process(id·+·1,·<span·class="stringliteral">"point-"</span>·+·name,·x··10.0,·y··10.0);</div>
122	</div><!--·fragment·--><p>The·conversion·to·C++·types·(here·<code>int</code>,·<code>std::string_view</code>,·and·two·<code>float</code>s)·is·built·into·the·function.·You·never·even·see·<code>row</code>·objects,·<code>field</code>·objects,·iterators,·or·conversion·methods.·You·just·put·in·your·query·and·you·receive·your·data.</p>	122	</div><!--·fragment·--><p>The·conversion·to·C++·types·(here·<code>int</code>,·<code>std::string_view</code>,·and·two·<code>float</code>s)·is·built·into·the·function.·You·never·even·see·<code>row</code>·objects,·<code>field</code>·objects,·iterators,·or·conversion·methods.·You·just·put·in·your·query·and·you·receive·your·data.</p>
123	<h1><a·class="anchor"·id="autotoc_md15"></a>	123	<h1><a·class="anchor"·id="autotoc_md28"></a>
124	Results·with·metadata</h1>	124	Results·with·metadata</h1>
125	<p>Sometimes·you·want·more·from·a·query·result·than·just·rows·of·data.·You·may·need·to·know·right·away·how·many·rows·of·result·data·you·received,·or·how·many·rows·your·<code>UPDATE</code>·statement·has·affected,·or·the·names·of·the·columns,·etc.</p>	125	<p>Sometimes·you·want·more·from·a·query·result·than·just·rows·of·data.·You·may·need·to·know·right·away·how·many·rows·of·result·data·you·received,·or·how·many·rows·your·<code>UPDATE</code>·statement·has·affected,·or·the·names·of·the·columns,·etc.</p>
126	<p>For·that,·use·the·transaction's·"exec"·query·execution·functions.·Apart·from·a·few·exceptions,·these·return·a·<code><a·class="el"·href="classpqxx_1_1result.html"·title="Result·set·containing·data·returned·by·a·query·or·command.">pqxx::result</a></code>·object.·A·<code>result</code>·is·a·container·of·<code><a·class="el"·href="classpqxx_1_1row.html"·title="Reference·to·one·row·in·a·result.">pqxx::row</a></code>·objects,·so·you·can·iterate·them·as·normal,·or·index·them·like·you·would·index·an·array.·Each·<code>row</code>·in·turn·is·a·container·of·<code><a·class="el"·href="classpqxx_1_1field.html"·title="Reference·to·a·field·in·a·result·set.">pqxx::field</a></code>,·Each·<code>field</code>·holds·a·value,·but·doesn't·know·its·type.·You·specify·the·type·when·you·read·the·value.</p>	126	<p>For·that,·use·the·transaction's·"exec"·query·execution·functions.·Apart·from·a·few·exceptions,·these·return·a·<code><a·class="el"·href="classpqxx_1_1result.html"·title="Result·set·containing·data·returned·by·a·query·or·command.">pqxx::result</a></code>·object.·A·<code>result</code>·is·a·container·of·<code><a·class="el"·href="classpqxx_1_1row.html"·title="Reference·to·one·row·in·a·result.">pqxx::row</a></code>·objects,·so·you·can·iterate·them·as·normal,·or·index·them·like·you·would·index·an·array.·Each·<code>row</code>·in·turn·is·a·container·of·<code><a·class="el"·href="classpqxx_1_1field.html"·title="Reference·to·a·field·in·a·result·set.">pqxx::field</a></code>,·Each·<code>field</code>·holds·a·value,·but·doesn't·know·its·type.·You·specify·the·type·when·you·read·the·value.</p>
127	<p>For·example,·your·code·might·do:</p>	127	<p>For·example,·your·code·might·do:</p>
128	<div·class="fragment"><div·class="line"><a·class="code·hl_class"·href="classpqxx_1_1result.html">pqxx::result</a>·r·=·tx.exec(<span·class="stringliteral">"SELECT·*·FROM·mytable"</span>);</div>	128	<div·class="fragment"><div·class="line"><a·class="code·hl_class"·href="classpqxx_1_1result.html">pqxx::result</a>·r·=·tx.exec(<span·class="stringliteral">"SELECT·*·FROM·mytable"</span>);</div>
129	<div·class="line"><span·class="keywordflow">for</span>·(<span·class="keyword">auto</span>·<span·class="keyword">const</span>·&row:·r)</div>	129	<div·class="line"><span·class="keywordflow">for</span>·(<span·class="keyword">auto</span>·<span·class="keyword">const</span>·&row:·r)</div>
130	<div·class="line">{</div>	130	<div·class="line">{</div>


Offset 103, 15 lines modified		Offset 103, 15 lines modified
103	<div·class="fragment"><div·class="line">std::string·hi{<span·class="stringliteral">"Hello·binary·world"</span>};</div>	103	<div·class="fragment"><div·class="line">std::string·hi{<span·class="stringliteral">"Hello·binary·world"</span>};</div>
104	<div·class="line">my_blob.write(<a·class="code·hl_function"·href="namespacepqxx.html#a738592f8a73c4ded3e30d4adb2ccc3a4">pqxx::binary_cast</a>(hi);</div>	104	<div·class="line">my_blob.write(<a·class="code·hl_function"·href="namespacepqxx.html#a738592f8a73c4ded3e30d4adb2ccc3a4">pqxx::binary_cast</a>(hi);</div>
105	<div·class="ttc"·id="anamespacepqxx_html_a738592f8a73c4ded3e30d4adb2ccc3a4"><div·class="ttname"><a·href="namespacepqxx.html#a738592f8a73c4ded3e30d4adb2ccc3a4">pqxx::binary_cast</a></div><div·class="ttdeci">bytes_view·binary_cast(TYPE·const·&data)</div><div·class="ttdoc">Cast·binary·data·to·a·type·that·libpqxx·will·recognise·as·binary.</div><div·class="ttdef"><b>Definition</b>·util.hxx:409</div></div>	105	<div·class="ttc"·id="anamespacepqxx_html_a738592f8a73c4ded3e30d4adb2ccc3a4"><div·class="ttname"><a·href="namespacepqxx.html#a738592f8a73c4ded3e30d4adb2ccc3a4">pqxx::binary_cast</a></div><div·class="ttdeci">bytes_view·binary_cast(TYPE·const·&data)</div><div·class="ttdoc">Cast·binary·data·to·a·type·that·libpqxx·will·recognise·as·binary.</div><div·class="ttdef"><b>Definition</b>·util.hxx:409</div></div>
106	</div><!--·fragment·--><p>The·other·takes·a·pointer·and·a·size:</p>	106	</div><!--·fragment·--><p>The·other·takes·a·pointer·and·a·size:</p>
107	<div·class="fragment"><div·class="line"><span·class="keywordtype">char</span>·<span·class="keyword">const</span>·greeting[]·=·<span·class="stringliteral">"Hello·binary·world"</span>;</div>	107	<div·class="fragment"><div·class="line"><span·class="keywordtype">char</span>·<span·class="keyword">const</span>·greeting[]·=·<span·class="stringliteral">"Hello·binary·world"</span>;</div>
108	<div·class="line"><span·class="keywordtype">char</span>·<span·class="keyword">const</span>·*hi·=·greeting;</div>	108	<div·class="line"><span·class="keywordtype">char</span>·<span·class="keyword">const</span>·*hi·=·greeting;</div>
109	<div·class="line">my_blob.write(<a·class="code·hl_function"·href="namespacepqxx.html#a738592f8a73c4ded3e30d4adb2ccc3a4">pqxx::binary_cast</a>(hi,·<span·class="keyword">sizeof</span>(greeting)));</div>	109	<div·class="line">my_blob.write(<a·class="code·hl_function"·href="namespacepqxx.html#a738592f8a73c4ded3e30d4adb2ccc3a4">pqxx::binary_cast</a>(hi,·<span·class="keyword">sizeof</span>(greeting)));</div>
110	</div><!--·fragment·--><h1><a·class="anchor"·id="autotoc_md12"></a>	110	</div><!--·fragment·--><h1><a·class="anchor"·id="autotoc_md0"></a>
111	Caveats</h1>	111	Caveats</h1>
112	<p>There·are·some·restrictions·on·<code>binary_cast</code>·that·you·must·be·aware·of.</p>	112	<p>There·are·some·restrictions·on·<code>binary_cast</code>·that·you·must·be·aware·of.</p>
113	<p>First,·your·data·must·of·a·type·that·gives·us·<em>bytes.</em>·So:·<code>char</code>,·<code>unsigned·char</code>,·<code>signed·char</code>,·<code>int8_t</code>,·<code>uint8_t</code>,·or·of·course·<code>std::byte</code>.·You·can't·feed·in·a·vector·of·<code>double</code>,·or·anything·like·that.</p>	113	<p>First,·your·data·must·of·a·type·that·gives·us·<em>bytes.</em>·So:·<code>char</code>,·<code>unsigned·char</code>,·<code>signed·char</code>,·<code>int8_t</code>,·<code>uint8_t</code>,·or·of·course·<code>std::byte</code>.·You·can't·feed·in·a·vector·of·<code>double</code>,·or·anything·like·that.</p>
114	<p>Second,·the·data·must·be·laid·out·as·a·contiguous·block·in·memory.·If·there's·no·<code>std::data()</code>·implementation·for·your·type,·it's·not·suitable.</p>	114	<p>Second,·the·data·must·be·laid·out·as·a·contiguous·block·in·memory.·If·there's·no·<code>std::data()</code>·implementation·for·your·type,·it's·not·suitable.</p>
115	<p>Third,·<code>binary_cast</code>·only·constructs·something·like·a·<code>std::string_view</code>.·It·does·not·make·a·copy·of·your·actual·data.·So,·make·sure·that·your·data·remains·alive·and·in·the·same·place·while·you're·using·it.·</p>	115	<p>Third,·<code>binary_cast</code>·only·constructs·something·like·a·<code>std::string_view</code>.·It·does·not·make·a·copy·of·your·actual·data.·So,·make·sure·that·your·data·remains·alive·and·in·the·same·place·while·you're·using·it.·</p>
116	</div></div><!--·contents·-->	116	</div></div><!--·contents·-->
117	</div><!--·PageDoc·-->	117	</div><!--·PageDoc·-->


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122	<tr·class="separator:accdb2ebade9563ca1c396925d65ce6ff"><td·class="memSeparator"·colspan="2"> </td></tr>	122	<tr·class="separator:accdb2ebade9563ca1c396925d65ce6ff"><td·class="memSeparator"·colspan="2"> </td></tr>
123	<tr·class="memitem:a4d31bd279a4e2314030b8f86b2dd3c2e"·id="r_a4d31bd279a4e2314030b8f86b2dd3c2e"><td·class="memItemLeft"·align="right"·valign="top">std::pair<·<a·class="el"·href="classpqxx_1_1array__parser.html#a039577d83d313a6daf35fd7c273e189e">juncture</a>,·std::string·> </td><td·class="memItemRight"·valign="bottom"><a·class="el"·href="classpqxx_1_1array__parser.html#a4d31bd279a4e2314030b8f86b2dd3c2e">get_next</a>·()</td></tr>	123	<tr·class="memitem:a4d31bd279a4e2314030b8f86b2dd3c2e"·id="r_a4d31bd279a4e2314030b8f86b2dd3c2e"><td·class="memItemLeft"·align="right"·valign="top">std::pair<·<a·class="el"·href="classpqxx_1_1array__parser.html#a039577d83d313a6daf35fd7c273e189e">juncture</a>,·std::string·> </td><td·class="memItemRight"·valign="bottom"><a·class="el"·href="classpqxx_1_1array__parser.html#a4d31bd279a4e2314030b8f86b2dd3c2e">get_next</a>·()</td></tr>
124	<tr·class="memdesc:a4d31bd279a4e2314030b8f86b2dd3c2e"><td·class="mdescLeft"> </td><td·class="mdescRight">Parse·the·next·step·in·the·array.··<br·/></td></tr>	124	<tr·class="memdesc:a4d31bd279a4e2314030b8f86b2dd3c2e"><td·class="mdescLeft"> </td><td·class="mdescRight">Parse·the·next·step·in·the·array.··<br·/></td></tr>
125	<tr·class="separator:a4d31bd279a4e2314030b8f86b2dd3c2e"><td·class="memSeparator"·colspan="2"> </td></tr>	125	<tr·class="separator:a4d31bd279a4e2314030b8f86b2dd3c2e"><td·class="memSeparator"·colspan="2"> </td></tr>
126	</table>	126	</table>
127	<a·name="details"·id="details"></a><h2·class="groupheader">Detailed·Description</h2>	127	<a·name="details"·id="details"></a><h2·class="groupheader">Detailed·Description</h2>
128	<div·class="textblock"><p>Low-level·parser·for·C++·arrays.·</p>	128	<div·class="textblock"><p>Low-level·parser·for·C++·arrays.·</p>
129	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000006">Deprecated:</a></b></dt><dd>Use·<a·class="el"·href="classpqxx_1_1array.html">pqxx::array</a>·instead.·</dd></dl>	129	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000001">Deprecated:</a></b></dt><dd>Use·<a·class="el"·href="classpqxx_1_1array.html">pqxx::array</a>·instead.·</dd></dl>
130	<p>Clunky·old·API·for·parsing·SQL·arrays.</p>	130	<p>Clunky·old·API·for·parsing·SQL·arrays.</p>
131	<dl·class="section·warning"><dt>Warning</dt><dd>This·parser·will·only·work·reliably·if·your·client·encoding·is·UTF-8,·ASCII,·or·a·"safe·ASCII·superset"·(such·as·the·EUC·encodings)·where·a·byte·value·in·the·ASCII·range·can·only·occur·as·an·actual·ASCII·character,·never·as·one·byte·in·a·multi-byte·character.</dd>	131	<dl·class="section·warning"><dt>Warning</dt><dd>This·parser·will·only·work·reliably·if·your·client·encoding·is·UTF-8,·ASCII,·or·a·"safe·ASCII·superset"·(such·as·the·EUC·encodings)·where·a·byte·value·in·the·ASCII·range·can·only·occur·as·an·actual·ASCII·character,·never·as·one·byte·in·a·multi-byte·character.</dd>
132	<dd>	132	<dd>
133	The·parser·only·supports·array·element·types·which·use·a·comma·(‘’,'<code>)·as·the·separator·between·array·elements.·All·built-in·SQL·types·use·comma,·except·for</code>box`·which·uses·semicolon.·However·some·custom·types·may·not·work.</dd></dl>	133	The·parser·only·supports·array·element·types·which·use·a·comma·(‘’,'<code>)·as·the·separator·between·array·elements.·All·built-in·SQL·types·use·comma,·except·for</code>box`·which·uses·semicolon.·However·some·custom·types·may·not·work.</dd></dl>
134	<p>The·input·is·a·C-style·string·containing·the·textual·representation·of·an·array,·as·returned·by·the·database.·The·parser·reads·this·representation·on·the·fly.·The·string·must·remain·in·memory·until·parsing·is·done.</p>	134	<p>The·input·is·a·C-style·string·containing·the·textual·representation·of·an·array,·as·returned·by·the·database.·The·parser·reads·this·representation·on·the·fly.·The·string·must·remain·in·memory·until·parsing·is·done.</p>
135	<p>Parse·the·array·by·making·calls·to·<a·class="el"·href="classpqxx_1_1array__parser.html#a4d31bd279a4e2314030b8f86b2dd3c2e">get_next</a>·until·it·returns·a·<a·class="el"·href="classpqxx_1_1array__parser.html#a039577d83d313a6daf35fd7c273e189e">juncture</a>·of·<code>done</code>.·The·<a·class="el"·href="classpqxx_1_1array__parser.html#a039577d83d313a6daf35fd7c273e189e">juncture</a>·tells·you·what·the·parser·found·in·that·step:·did·the·array·"nest"·to·a·deeper·level,·or·"un-nest"·back·up?·</p>	135	<p>Parse·the·array·by·making·calls·to·<a·class="el"·href="classpqxx_1_1array__parser.html#a4d31bd279a4e2314030b8f86b2dd3c2e">get_next</a>·until·it·returns·a·<a·class="el"·href="classpqxx_1_1array__parser.html#a039577d83d313a6daf35fd7c273e189e">juncture</a>·of·<code>done</code>.·The·<a·class="el"·href="classpqxx_1_1array__parser.html#a039577d83d313a6daf35fd7c273e189e">juncture</a>·tells·you·what·the·parser·found·in·that·step:·did·the·array·"nest"·to·a·deeper·level,·or·"un-nest"·back·up?·</p>
136	</div><h2·class="groupheader">Member·Enumeration·Documentation</h2>	136	</div><h2·class="groupheader">Member·Enumeration·Documentation</h2>


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148	<tr·class="memitem:a1eb13da2bc5a6ec395c7d1832c6266c2"·id="r_a1eb13da2bc5a6ec395c7d1832c6266c2"><td·class="memItemLeft"·align="right"·valign="top"><a·id="a1eb13da2bc5a6ec395c7d1832c6266c2"·name="a1eb13da2bc5a6ec395c7d1832c6266c2"></a>	148	<tr·class="memitem:a1eb13da2bc5a6ec395c7d1832c6266c2"·id="r_a1eb13da2bc5a6ec395c7d1832c6266c2"><td·class="memItemLeft"·align="right"·valign="top"><a·id="a1eb13da2bc5a6ec395c7d1832c6266c2"·name="a1eb13da2bc5a6ec395c7d1832c6266c2"></a>
149	</td><td·class="memItemRight"·valign="bottom"><b>basic_fieldstream</b>·(<a·class="el"·href="classpqxx_1_1field.html">field</a>·const·&f)</td></tr>	149	</td><td·class="memItemRight"·valign="bottom"><b>basic_fieldstream</b>·(<a·class="el"·href="classpqxx_1_1field.html">field</a>·const·&f)</td></tr>
150	<tr·class="separator:a1eb13da2bc5a6ec395c7d1832c6266c2"><td·class="memSeparator"·colspan="2"> </td></tr>	150	<tr·class="separator:a1eb13da2bc5a6ec395c7d1832c6266c2"><td·class="memSeparator"·colspan="2"> </td></tr>
151	</table>	151	</table>
152	<a·name="details"·id="details"></a><h2·class="groupheader">Detailed·Description</h2>	152	<a·name="details"·id="details"></a><h2·class="groupheader">Detailed·Description</h2>
153	<div·class="textblock"><div·class="compoundTemplParams">template<typename·CHAR·=·char,·typename·TRAITS·=·std::char_traits<CHAR>><br·/>	153	<div·class="textblock"><div·class="compoundTemplParams">template<typename·CHAR·=·char,·typename·TRAITS·=·std::char_traits<CHAR>><br·/>
154	class·pqxx::basic_fieldstream<·CHAR,·TRAITS·></div><p>Input·stream·that·gets·its·data·from·a·result·field.·</p>	154	class·pqxx::basic_fieldstream<·CHAR,·TRAITS·></div><p>Input·stream·that·gets·its·data·from·a·result·field.·</p>
155	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000014">Deprecated:</a></b></dt><dd>To·convert·a·field's·value·string·to·some·other·type,·e.g.·to·an·<code>int</code>,·use·the·field's·<code>as<...>()</code>·member·function.·To·read·a·field·efficiently·just·as·a·string,·use·its·<code>c_str()</code>·or·its·<code>as<std::string_vview>()</code>.</dd></dl>	155	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000006">Deprecated:</a></b></dt><dd>To·convert·a·field's·value·string·to·some·other·type,·e.g.·to·an·<code>int</code>,·use·the·field's·<code>as<...>()</code>·member·function.·To·read·a·field·efficiently·just·as·a·string,·use·its·<code>c_str()</code>·or·its·<code>as<std::string_vview>()</code>.</dd></dl>
156	<p>Works·like·any·other·istream·to·read·data·from·a·field.·It·supports·all·formatting·and·streaming·operations·of·<code>std::istream</code>.·For·convenience·there·is·a·fieldstream·alias,·which·defines·a·<a·class="el"·href="classpqxx_1_1basic__fieldstream.html">basic_fieldstream</a>·for·<code>char</code>.·This·is·similar·to·how·e.g.·<code>std::ifstream</code>·relates·to·<code>std::basic_ifstream</code>.</p>	156	<p>Works·like·any·other·istream·to·read·data·from·a·field.·It·supports·all·formatting·and·streaming·operations·of·<code>std::istream</code>.·For·convenience·there·is·a·fieldstream·alias,·which·defines·a·<a·class="el"·href="classpqxx_1_1basic__fieldstream.html">basic_fieldstream</a>·for·<code>char</code>.·This·is·similar·to·how·e.g.·<code>std::ifstream</code>·relates·to·<code>std::basic_ifstream</code>.</p>
157	<p>This·class·has·only·been·tested·for·the·char·type·(and·its·default·traits).·</p>	157	<p>This·class·has·only·been·tested·for·the·char·type·(and·its·default·traits).·</p>
158	</div><hr/>The·documentation·for·this·class·was·generated·from·the·following·file:<ul>	158	</div><hr/>The·documentation·for·this·class·was·generated·from·the·following·file:<ul>
159	<li>/build/reproducible-path/libpqxx-7.10.0/include/pqxx/<a·class="el"·href="field_8hxx_source.html">field.hxx</a></li>	159	<li>/build/reproducible-path/libpqxx-7.10.0/include/pqxx/<a·class="el"·href="field_8hxx_source.html">field.hxx</a></li>
160	</ul>	160	</ul>
161	</div><!--·contents·-->	161	</div><!--·contents·-->
162	</div><!--·doc-content·-->	162	</div><!--·doc-content·-->


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151	<tr·class="memitem:a1ad04f291d7854a4dd66a3ea72035534"·id="r_a1ad04f291d7854a4dd66a3ea72035534"><td·class="memItemLeft"·align="right"·valign="top"> </td><td·class="memItemRight"·valign="bottom"><a·class="el"·href="classpqxx_1_1basic__ilostream.html#a1ad04f291d7854a4dd66a3ea72035534">basic_ilostream</a>·(<a·class="el"·href="group__transactions.html#classpqxx_1_1dbtransaction">dbtransaction</a>·&t,·<a·class="el"·href="namespacepqxx.html#ac9eb697318d27a5b023609e0160f1ade">oid</a>·o,·largeobject::size_type·buf_size=512)</td></tr>	151	<tr·class="memitem:a1ad04f291d7854a4dd66a3ea72035534"·id="r_a1ad04f291d7854a4dd66a3ea72035534"><td·class="memItemLeft"·align="right"·valign="top"> </td><td·class="memItemRight"·valign="bottom"><a·class="el"·href="classpqxx_1_1basic__ilostream.html#a1ad04f291d7854a4dd66a3ea72035534">basic_ilostream</a>·(<a·class="el"·href="group__transactions.html#classpqxx_1_1dbtransaction">dbtransaction</a>·&t,·<a·class="el"·href="namespacepqxx.html#ac9eb697318d27a5b023609e0160f1ade">oid</a>·o,·largeobject::size_type·buf_size=512)</td></tr>
152	<tr·class="memdesc:a1ad04f291d7854a4dd66a3ea72035534"><td·class="mdescLeft"> </td><td·class="mdescRight">Create·a·<a·class="el"·href="classpqxx_1_1basic__ilostream.html"·title="Input·stream·that·gets·its·data·from·a·large·object.">basic_ilostream</a>.··<br·/></td></tr>	152	<tr·class="memdesc:a1ad04f291d7854a4dd66a3ea72035534"><td·class="mdescLeft"> </td><td·class="mdescRight">Create·a·<a·class="el"·href="classpqxx_1_1basic__ilostream.html"·title="Input·stream·that·gets·its·data·from·a·large·object.">basic_ilostream</a>.··<br·/></td></tr>
153	<tr·class="separator:a1ad04f291d7854a4dd66a3ea72035534"><td·class="memSeparator"·colspan="2"> </td></tr>	153	<tr·class="separator:a1ad04f291d7854a4dd66a3ea72035534"><td·class="memSeparator"·colspan="2"> </td></tr>
154	</table>	154	</table>
155	<a·name="details"·id="details"></a><h2·class="groupheader">Detailed·Description</h2>	155	<a·name="details"·id="details"></a><h2·class="groupheader">Detailed·Description</h2>
156	<div·class="textblock"><div·class="compoundTemplParams">template<typename·CHAR·=·char,·typename·TRAITS·=·std::char_traits<CHAR>><br·/>	156	<div·class="textblock"><div·class="compoundTemplParams">template<typename·CHAR·=·char,·typename·TRAITS·=·std::char_traits<CHAR>><br·/>
157	class·pqxx::basic_ilostream<·CHAR,·TRAITS·></div><p>Input·stream·that·gets·its·data·from·a·large·object.·</p>	157	class·pqxx::basic_ilostream<·CHAR,·TRAITS·></div><p>Input·stream·that·gets·its·data·from·a·large·object.·</p>
158	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000041">Deprecated:</a></b></dt><dd>Access·large·objects·directly·using·the·<a·class="el"·href="classpqxx_1_1blob.html">blob</a>·class.</dd></dl>	158	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000031">Deprecated:</a></b></dt><dd>Access·large·objects·directly·using·the·<a·class="el"·href="classpqxx_1_1blob.html">blob</a>·class.</dd></dl>
159	<p>This·class·worked·like·any·other·istream,·but·to·read·data·from·a·large·object.·It·supported·all·formatting·and·streaming·operations·of·<code>std::istream</code>.</p>	159	<p>This·class·worked·like·any·other·istream,·but·to·read·data·from·a·large·object.·It·supported·all·formatting·and·streaming·operations·of·<code>std::istream</code>.</p>
160	<p>This·functionality·was·considered·too·fragile·and·complex,·so·it·has·been·replaced·with·a·single,·much·simpler·class.·</p>	160	<p>This·functionality·was·considered·too·fragile·and·complex,·so·it·has·been·replaced·with·a·single,·much·simpler·class.·</p>
161	</div><h2·class="groupheader">Constructor·&·Destructor·Documentation</h2>	161	</div><h2·class="groupheader">Constructor·&·Destructor·Documentation</h2>
162	<a·id="a67f1cdf6e05f02e4ac2bbcde5ce117b8"·name="a67f1cdf6e05f02e4ac2bbcde5ce117b8"></a>	162	<a·id="a67f1cdf6e05f02e4ac2bbcde5ce117b8"·name="a67f1cdf6e05f02e4ac2bbcde5ce117b8"></a>
163	<h2·class="memtitle"><span·class="permalink"><a·href="#a67f1cdf6e05f02e4ac2bbcde5ce117b8">◆ </a></span>basic_ilostream()·<span·class="overload">[1/2]</span></h2>	163	<h2·class="memtitle"><span·class="permalink"><a·href="#a67f1cdf6e05f02e4ac2bbcde5ce117b8">◆ </a></span>basic_ilostream()·<span·class="overload">[1/2]</span></h2>

164	<div·class="memitem">	164	<div·class="memitem">


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151	<tr·class="memitem:ac8a118d4e4b7eb0acff3df853d698b66"·id="r_ac8a118d4e4b7eb0acff3df853d698b66"><td·class="memItemLeft"·align="right"·valign="top"> </td><td·class="memItemRight"·valign="bottom"><a·class="el"·href="classpqxx_1_1basic__lostream.html#ac8a118d4e4b7eb0acff3df853d698b66">basic_lostream</a>·(<a·class="el"·href="group__transactions.html#classpqxx_1_1dbtransaction">dbtransaction</a>·&t,·<a·class="el"·href="namespacepqxx.html#ac9eb697318d27a5b023609e0160f1ade">oid</a>·o,·largeobject::size_type·buf_size=512)</td></tr>	151	<tr·class="memitem:ac8a118d4e4b7eb0acff3df853d698b66"·id="r_ac8a118d4e4b7eb0acff3df853d698b66"><td·class="memItemLeft"·align="right"·valign="top"> </td><td·class="memItemRight"·valign="bottom"><a·class="el"·href="classpqxx_1_1basic__lostream.html#ac8a118d4e4b7eb0acff3df853d698b66">basic_lostream</a>·(<a·class="el"·href="group__transactions.html#classpqxx_1_1dbtransaction">dbtransaction</a>·&t,·<a·class="el"·href="namespacepqxx.html#ac9eb697318d27a5b023609e0160f1ade">oid</a>·o,·largeobject::size_type·buf_size=512)</td></tr>
152	<tr·class="memdesc:ac8a118d4e4b7eb0acff3df853d698b66"><td·class="mdescLeft"> </td><td·class="mdescRight">Create·a·<a·class="el"·href="classpqxx_1_1basic__lostream.html"·title="Stream·that·reads·and·writes·a·large·object.">basic_lostream</a>.··<br·/></td></tr>	152	<tr·class="memdesc:ac8a118d4e4b7eb0acff3df853d698b66"><td·class="mdescLeft"> </td><td·class="mdescRight">Create·a·<a·class="el"·href="classpqxx_1_1basic__lostream.html"·title="Stream·that·reads·and·writes·a·large·object.">basic_lostream</a>.··<br·/></td></tr>
153	<tr·class="separator:ac8a118d4e4b7eb0acff3df853d698b66"><td·class="memSeparator"·colspan="2"> </td></tr>	153	<tr·class="separator:ac8a118d4e4b7eb0acff3df853d698b66"><td·class="memSeparator"·colspan="2"> </td></tr>
154	</table>	154	</table>
155	<a·name="details"·id="details"></a><h2·class="groupheader">Detailed·Description</h2>	155	<a·name="details"·id="details"></a><h2·class="groupheader">Detailed·Description</h2>
156	<div·class="textblock"><div·class="compoundTemplParams">template<typename·CHAR·=·char,·typename·TRAITS·=·std::char_traits<CHAR>><br·/>	156	<div·class="textblock"><div·class="compoundTemplParams">template<typename·CHAR·=·char,·typename·TRAITS·=·std::char_traits<CHAR>><br·/>
157	class·pqxx::basic_lostream<·CHAR,·TRAITS·></div><p>Stream·that·reads·and·writes·a·large·object.·</p>	157	class·pqxx::basic_lostream<·CHAR,·TRAITS·></div><p>Stream·that·reads·and·writes·a·large·object.·</p>
158	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000043">Deprecated:</a></b></dt><dd>Access·large·objects·directly·using·the·<a·class="el"·href="classpqxx_1_1blob.html">blob</a>·class.</dd></dl>	158	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000039">Deprecated:</a></b></dt><dd>Access·large·objects·directly·using·the·<a·class="el"·href="classpqxx_1_1blob.html">blob</a>·class.</dd></dl>
159	<p>This·worked·like·a·std::iostream,·but·to·read·data·from,·or·write·data·to,·a·large·object.·It·supported·all·formatting·and·streaming·operations·of·<code>std::iostream</code>.</p>	159	<p>This·worked·like·a·std::iostream,·but·to·read·data·from,·or·write·data·to,·a·large·object.·It·supported·all·formatting·and·streaming·operations·of·<code>std::iostream</code>.</p>
160	<p>This·functionality·was·considered·too·fragile·and·complex,·so·it·has·been·replaced·with·a·single,·much·simpler·class.·</p>	160	<p>This·functionality·was·considered·too·fragile·and·complex,·so·it·has·been·replaced·with·a·single,·much·simpler·class.·</p>
161	</div><h2·class="groupheader">Constructor·&·Destructor·Documentation</h2>	161	</div><h2·class="groupheader">Constructor·&·Destructor·Documentation</h2>
162	<a·id="a8aaf8ee6fd445f410ce1153212315baa"·name="a8aaf8ee6fd445f410ce1153212315baa"></a>	162	<a·id="a8aaf8ee6fd445f410ce1153212315baa"·name="a8aaf8ee6fd445f410ce1153212315baa"></a>
163	<h2·class="memtitle"><span·class="permalink"><a·href="#a8aaf8ee6fd445f410ce1153212315baa">◆ </a></span>basic_lostream()·<span·class="overload">[1/2]</span></h2>	163	<h2·class="memtitle"><span·class="permalink"><a·href="#a8aaf8ee6fd445f410ce1153212315baa">◆ </a></span>basic_lostream()·<span·class="overload">[1/2]</span></h2>

164	<div·class="memitem">	164	<div·class="memitem">


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151	<tr·class="memitem:aa444228f010d79bbbc2b23a10cb20e5c"·id="r_aa444228f010d79bbbc2b23a10cb20e5c"><td·class="memItemLeft"·align="right"·valign="top"> </td><td·class="memItemRight"·valign="bottom"><a·class="el"·href="classpqxx_1_1basic__olostream.html#aa444228f010d79bbbc2b23a10cb20e5c">basic_olostream</a>·(<a·class="el"·href="group__transactions.html#classpqxx_1_1dbtransaction">dbtransaction</a>·&t,·<a·class="el"·href="namespacepqxx.html#ac9eb697318d27a5b023609e0160f1ade">oid</a>·o,·largeobject::size_type·buf_size=512)</td></tr>	151	<tr·class="memitem:aa444228f010d79bbbc2b23a10cb20e5c"·id="r_aa444228f010d79bbbc2b23a10cb20e5c"><td·class="memItemLeft"·align="right"·valign="top"> </td><td·class="memItemRight"·valign="bottom"><a·class="el"·href="classpqxx_1_1basic__olostream.html#aa444228f010d79bbbc2b23a10cb20e5c">basic_olostream</a>·(<a·class="el"·href="group__transactions.html#classpqxx_1_1dbtransaction">dbtransaction</a>·&t,·<a·class="el"·href="namespacepqxx.html#ac9eb697318d27a5b023609e0160f1ade">oid</a>·o,·largeobject::size_type·buf_size=512)</td></tr>
152	<tr·class="memdesc:aa444228f010d79bbbc2b23a10cb20e5c"><td·class="mdescLeft"> </td><td·class="mdescRight">Create·a·<a·class="el"·href="classpqxx_1_1basic__olostream.html"·title="Output·stream·that·writes·data·back·to·a·large·object.">basic_olostream</a>.··<br·/></td></tr>	152	<tr·class="memdesc:aa444228f010d79bbbc2b23a10cb20e5c"><td·class="mdescLeft"> </td><td·class="mdescRight">Create·a·<a·class="el"·href="classpqxx_1_1basic__olostream.html"·title="Output·stream·that·writes·data·back·to·a·large·object.">basic_olostream</a>.··<br·/></td></tr>
153	<tr·class="separator:aa444228f010d79bbbc2b23a10cb20e5c"><td·class="memSeparator"·colspan="2"> </td></tr>	153	<tr·class="separator:aa444228f010d79bbbc2b23a10cb20e5c"><td·class="memSeparator"·colspan="2"> </td></tr>
154	</table>	154	</table>
155	<a·name="details"·id="details"></a><h2·class="groupheader">Detailed·Description</h2>	155	<a·name="details"·id="details"></a><h2·class="groupheader">Detailed·Description</h2>
156	<div·class="textblock"><div·class="compoundTemplParams">template<typename·CHAR·=·char,·typename·TRAITS·=·std::char_traits<CHAR>><br·/>	156	<div·class="textblock"><div·class="compoundTemplParams">template<typename·CHAR·=·char,·typename·TRAITS·=·std::char_traits<CHAR>><br·/>
157	class·pqxx::basic_olostream<·CHAR,·TRAITS·></div><p>Output·stream·that·writes·data·back·to·a·large·object.·</p>	157	class·pqxx::basic_olostream<·CHAR,·TRAITS·></div><p>Output·stream·that·writes·data·back·to·a·large·object.·</p>
158	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000042">Deprecated:</a></b></dt><dd>Access·large·objects·directly·using·the·<a·class="el"·href="classpqxx_1_1blob.html">blob</a>·class.</dd></dl>	158	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000032">Deprecated:</a></b></dt><dd>Access·large·objects·directly·using·the·<a·class="el"·href="classpqxx_1_1blob.html">blob</a>·class.</dd></dl>
159	<p>This·worked·like·any·other·ostream,·but·to·write·data·to·a·large·object.·It·supported·all·formatting·and·streaming·operations·of·<code>std::ostream</code>.</p>	159	<p>This·worked·like·any·other·ostream,·but·to·write·data·to·a·large·object.·It·supported·all·formatting·and·streaming·operations·of·<code>std::ostream</code>.</p>
160	<p>This·functionality·was·considered·too·fragile·and·complex,·so·it·has·been·replaced·with·a·single,·much·simpler·class.·</p>	160	<p>This·functionality·was·considered·too·fragile·and·complex,·so·it·has·been·replaced·with·a·single,·much·simpler·class.·</p>
161	</div><h2·class="groupheader">Constructor·&·Destructor·Documentation</h2>	161	</div><h2·class="groupheader">Constructor·&·Destructor·Documentation</h2>
162	<a·id="a48a66d3ebac27506cfcccd2d30e27e9e"·name="a48a66d3ebac27506cfcccd2d30e27e9e"></a>	162	<a·id="a48a66d3ebac27506cfcccd2d30e27e9e"·name="a48a66d3ebac27506cfcccd2d30e27e9e"></a>
163	<h2·class="memtitle"><span·class="permalink"><a·href="#a48a66d3ebac27506cfcccd2d30e27e9e">◆ </a></span>basic_olostream()·<span·class="overload">[1/2]</span></h2>	163	<h2·class="memtitle"><span·class="permalink"><a·href="#a48a66d3ebac27506cfcccd2d30e27e9e">◆ </a></span>basic_olostream()·<span·class="overload">[1/2]</span></h2>

164	<div·class="memitem">	164	<div·class="memitem">


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126	<tr·class="heading"><td·colspan="2"><h2·class="groupheader"><a·id="friends"·name="friends"></a>	126	<tr·class="heading"><td·colspan="2"><h2·class="groupheader"><a·id="friends"·name="friends"></a>
127	Friends</h2></td></tr>	127	Friends</h2></td></tr>
128	<tr·class="memitem:af70de8ea5e1464b69bc5a4c4eaadb98e"·id="r_af70de8ea5e1464b69bc5a4c4eaadb98e"><td·class="memItemLeft"·align="right"·valign="top"><a·id="af70de8ea5e1464b69bc5a4c4eaadb98e"·name="af70de8ea5e1464b69bc5a4c4eaadb98e"></a>	128	<tr·class="memitem:af70de8ea5e1464b69bc5a4c4eaadb98e"·id="r_af70de8ea5e1464b69bc5a4c4eaadb98e"><td·class="memItemLeft"·align="right"·valign="top"><a·id="af70de8ea5e1464b69bc5a4c4eaadb98e"·name="af70de8ea5e1464b69bc5a4c4eaadb98e"></a>
129	class </td><td·class="memItemRight"·valign="bottom"><b>internal::gate::errorhandler_connection</b></td></tr>	129	class </td><td·class="memItemRight"·valign="bottom"><b>internal::gate::errorhandler_connection</b></td></tr>
130	<tr·class="separator:af70de8ea5e1464b69bc5a4c4eaadb98e"><td·class="memSeparator"·colspan="2"> </td></tr>	130	<tr·class="separator:af70de8ea5e1464b69bc5a4c4eaadb98e"><td·class="memSeparator"·colspan="2"> </td></tr>
131	</table>	131	</table>
132	<a·name="details"·id="details"></a><h2·class="groupheader">Detailed·Description</h2>	132	<a·name="details"·id="details"></a><h2·class="groupheader">Detailed·Description</h2>
133	<div·class="textblock"><dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000001">Deprecated:</a></b></dt><dd>Base·class·for·obsolete·error-handler·callbacks.·</dd></dl>	133	<div·class="textblock"><dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000004">Deprecated:</a></b></dt><dd>Base·class·for·obsolete·error-handler·callbacks.·</dd></dl>
134	<p>This·method·of·handling·errors·is·obsolete.·Use·a·"notice·handler"·instead.</p>	134	<p>This·method·of·handling·errors·is·obsolete.·Use·a·"notice·handler"·instead.</p>
135	<dl·class="section·warning"><dt>Warning</dt><dd>Strange·things·happen·when·a·result·object·outlives·its·parent·connection.·If·you·register·an·error·handler·on·a·connection,·then·you·must·not·access·the·result·after·destroying·the·connection.·This·applies·even·if·you·destroy·the·error·handler·first!·</dd></dl>	135	<dl·class="section·warning"><dt>Warning</dt><dd>Strange·things·happen·when·a·result·object·outlives·its·parent·connection.·If·you·register·an·error·handler·on·a·connection,·then·you·must·not·access·the·result·after·destroying·the·connection.·This·applies·even·if·you·destroy·the·error·handler·first!·</dd></dl>
136	</div><h2·class="groupheader">Constructor·&·Destructor·Documentation</h2>	136	</div><h2·class="groupheader">Constructor·&·Destructor·Documentation</h2>
137	<a·id="a397ca98800efffe365f52d5998bb8b94"·name="a397ca98800efffe365f52d5998bb8b94"></a>	137	<a·id="a397ca98800efffe365f52d5998bb8b94"·name="a397ca98800efffe365f52d5998bb8b94"></a>
138	<h2·class="memtitle"><span·class="permalink"><a·href="#a397ca98800efffe365f52d5998bb8b94">◆ </a></span>errorhandler()</h2>	138	<h2·class="memtitle"><span·class="permalink"><a·href="#a397ca98800efffe365f52d5998bb8b94">◆ </a></span>errorhandler()</h2>

139	<div·class="memitem">	139	<div·class="memitem">


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124	<tr·class="memitem:a6a7c269ca56ea7a8525594f48c42cc80"·id="r_a6a7c269ca56ea7a8525594f48c42cc80"><td·class="memItemLeft"·align="right"·valign="top"><a·id="a6a7c269ca56ea7a8525594f48c42cc80"·name="a6a7c269ca56ea7a8525594f48c42cc80"></a>	124	<tr·class="memitem:a6a7c269ca56ea7a8525594f48c42cc80"·id="r_a6a7c269ca56ea7a8525594f48c42cc80"><td·class="memItemLeft"·align="right"·valign="top"><a·id="a6a7c269ca56ea7a8525594f48c42cc80"·name="a6a7c269ca56ea7a8525594f48c42cc80"></a>
125	constexpr·auto </td><td·class="memItemRight"·valign="bottom"><b>access</b>·(decltype(*std::declval<·IT·>())·value)·const·->·decltype(std::declval<·ACCESSOR·>()(value))</td></tr>	125	constexpr·auto </td><td·class="memItemRight"·valign="bottom"><b>access</b>·(decltype(*std::declval<·IT·>())·value)·const·->·decltype(std::declval<·ACCESSOR·>()(value))</td></tr>
126	<tr·class="separator:a6a7c269ca56ea7a8525594f48c42cc80"><td·class="memSeparator"·colspan="2"> </td></tr>	126	<tr·class="separator:a6a7c269ca56ea7a8525594f48c42cc80"><td·class="memSeparator"·colspan="2"> </td></tr>
127	</table>	127	</table>
128	<a·name="details"·id="details"></a><h2·class="groupheader">Detailed·Description</h2>	128	<a·name="details"·id="details"></a><h2·class="groupheader">Detailed·Description</h2>
129	<div·class="textblock"><div·class="compoundTemplParams">template<typename·IT,·typename·ACCESSOR·=·decltype(iterator_identity<IT>)><br·/>	129	<div·class="textblock"><div·class="compoundTemplParams">template<typename·IT,·typename·ACCESSOR·=·decltype(iterator_identity<IT>)><br·/>
130	class·pqxx::internal::dynamic_params<·IT,·ACCESSOR·></div><dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000004">Deprecated:</a></b></dt><dd>Use·<a·class="el"·href="classpqxx_1_1params.html">params</a>·instead.·</dd></dl>	130	class·pqxx::internal::dynamic_params<·IT,·ACCESSOR·></div><dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000009">Deprecated:</a></b></dt><dd>Use·<a·class="el"·href="classpqxx_1_1params.html">params</a>·instead.·</dd></dl>
131	</div><h2·class="groupheader">Constructor·&·Destructor·Documentation</h2>	131	</div><h2·class="groupheader">Constructor·&·Destructor·Documentation</h2>
132	<a·id="aadfb6e389288cca5a5f5b89cc3a2fdc3"·name="aadfb6e389288cca5a5f5b89cc3a2fdc3"></a>	132	<a·id="aadfb6e389288cca5a5f5b89cc3a2fdc3"·name="aadfb6e389288cca5a5f5b89cc3a2fdc3"></a>
133	<h2·class="memtitle"><span·class="permalink"><a·href="#aadfb6e389288cca5a5f5b89cc3a2fdc3">◆ </a></span>dynamic_params()·<span·class="overload">[1/2]</span></h2>	133	<h2·class="memtitle"><span·class="permalink"><a·href="#aadfb6e389288cca5a5f5b89cc3a2fdc3">◆ </a></span>dynamic_params()·<span·class="overload">[1/2]</span></h2>

134	<div·class="memitem">	134	<div·class="memitem">
135	<div·class="memproto">	135	<div·class="memproto">
136	<div·class="memtemplate">	136	<div·class="memtemplate">


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172	<tr·class="memitem:a49f6a19f15da88a9f5d8cd0a484f368e"·id="r_a49f6a19f15da88a9f5d8cd0a484f368e"><td·class="memItemLeft"·align="right"·valign="top"><a·id="a49f6a19f15da88a9f5d8cd0a484f368e"·name="a49f6a19f15da88a9f5d8cd0a484f368e"></a>	172	<tr·class="memitem:a49f6a19f15da88a9f5d8cd0a484f368e"·id="r_a49f6a19f15da88a9f5d8cd0a484f368e"><td·class="memItemLeft"·align="right"·valign="top"><a·id="a49f6a19f15da88a9f5d8cd0a484f368e"·name="a49f6a19f15da88a9f5d8cd0a484f368e"></a>
173	PQXX_PRIVATE·std::string </td><td·class="memItemRight"·valign="bottom"><b>reason</b>·(<a·class="el"·href="classpqxx_1_1connection.html">connection</a>·const·&,·int·err)·const</td></tr>	173	PQXX_PRIVATE·std::string </td><td·class="memItemRight"·valign="bottom"><b>reason</b>·(<a·class="el"·href="classpqxx_1_1connection.html">connection</a>·const·&,·int·err)·const</td></tr>
174	<tr·class="separator:a49f6a19f15da88a9f5d8cd0a484f368e"><td·class="memSeparator"·colspan="2"> </td></tr>	174	<tr·class="separator:a49f6a19f15da88a9f5d8cd0a484f368e"><td·class="memSeparator"·colspan="2"> </td></tr>
175	</table>	175	</table>
176	<a·name="details"·id="details"></a><h2·class="groupheader">Detailed·Description</h2>	176	<a·name="details"·id="details"></a><h2·class="groupheader">Detailed·Description</h2>
177	<div·class="textblock"><p>Identity·of·a·large·object.·</p>	177	<div·class="textblock"><p>Identity·of·a·large·object.·</p>
178	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000038">Deprecated:</a></b></dt><dd>Use·the·<a·class="el"·href="classpqxx_1_1blob.html">blob</a>·class·instead.</dd></dl>	178	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000028">Deprecated:</a></b></dt><dd>Use·the·<a·class="el"·href="classpqxx_1_1blob.html">blob</a>·class·instead.</dd></dl>
179	<p>Encapsulates·the·identity·of·a·large·object.</p>	179	<p>Encapsulates·the·identity·of·a·large·object.</p>
180	<p>A·largeobject·must·be·accessed·only·from·within·a·backend·transaction,·but·the·object's·identity·remains·valid·as·long·as·the·object·exists.·</p>	180	<p>A·largeobject·must·be·accessed·only·from·within·a·backend·transaction,·but·the·object's·identity·remains·valid·as·long·as·the·object·exists.·</p>
181	</div><h2·class="groupheader">Constructor·&·Destructor·Documentation</h2>	181	</div><h2·class="groupheader">Constructor·&·Destructor·Documentation</h2>
182	<a·id="a9450db026a6206b00fdd95054360e224"·name="a9450db026a6206b00fdd95054360e224"></a>	182	<a·id="a9450db026a6206b00fdd95054360e224"·name="a9450db026a6206b00fdd95054360e224"></a>
183	<h2·class="memtitle"><span·class="permalink"><a·href="#a9450db026a6206b00fdd95054360e224">◆ </a></span>largeobject()·<span·class="overload">[1/5]</span></h2>	183	<h2·class="memtitle"><span·class="permalink"><a·href="#a9450db026a6206b00fdd95054360e224">◆ </a></span>largeobject()·<span·class="overload">[1/5]</span></h2>

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190	<tr·class="memitem:aabc6021018cb6ec95c95545657ff4ac5"·id="r_aabc6021018cb6ec95c95545657ff4ac5"><td·class="memItemLeft"·align="right"·valign="top"><a·id="aabc6021018cb6ec95c95545657ff4ac5"·name="aabc6021018cb6ec95c95545657ff4ac5"></a>	190	<tr·class="memitem:aabc6021018cb6ec95c95545657ff4ac5"·id="r_aabc6021018cb6ec95c95545657ff4ac5"><td·class="memItemLeft"·align="right"·valign="top"><a·id="aabc6021018cb6ec95c95545657ff4ac5"·name="aabc6021018cb6ec95c95545657ff4ac5"></a>
191	virtual·int_type </td><td·class="memItemRight"·valign="bottom"><b>underflow</b>·()·override</td></tr>	191	virtual·int_type </td><td·class="memItemRight"·valign="bottom"><b>underflow</b>·()·override</td></tr>
192	<tr·class="separator:aabc6021018cb6ec95c95545657ff4ac5"><td·class="memSeparator"·colspan="2"> </td></tr>	192	<tr·class="separator:aabc6021018cb6ec95c95545657ff4ac5"><td·class="memSeparator"·colspan="2"> </td></tr>
193	</table>	193	</table>
194	<a·name="details"·id="details"></a><h2·class="groupheader">Detailed·Description</h2>	194	<a·name="details"·id="details"></a><h2·class="groupheader">Detailed·Description</h2>
195	<div·class="textblock"><div·class="compoundTemplParams">template<typename·CHAR·=·char,·typename·TRAITS·=·std::char_traits<CHAR>><br·/>	195	<div·class="textblock"><div·class="compoundTemplParams">template<typename·CHAR·=·char,·typename·TRAITS·=·std::char_traits<CHAR>><br·/>
196	class·pqxx::largeobject_streambuf<·CHAR,·TRAITS·></div><p>Streambuf·to·use·large·objects·in·standard·I/O·streams.·</p>	196	class·pqxx::largeobject_streambuf<·CHAR,·TRAITS·></div><p>Streambuf·to·use·large·objects·in·standard·I/O·streams.·</p>
197	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000040">Deprecated:</a></b></dt><dd>Access·large·objects·directly·using·the·<a·class="el"·href="classpqxx_1_1blob.html">blob</a>·class.</dd></dl>	197	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000030">Deprecated:</a></b></dt><dd>Access·large·objects·directly·using·the·<a·class="el"·href="classpqxx_1_1blob.html">blob</a>·class.</dd></dl>
198	<p>The·standard·streambuf·classes·provide·uniform·access·to·data·storage·such·as·files·or·string·buffers,·so·they·can·be·accessed·using·standard·input·or·output·streams.·This·streambuf·implementation·provided·similar·access·to·large·objects,·so·they·could·be·read·and·written·using·the·same·stream·classes.</p>	198	<p>The·standard·streambuf·classes·provide·uniform·access·to·data·storage·such·as·files·or·string·buffers,·so·they·can·be·accessed·using·standard·input·or·output·streams.·This·streambuf·implementation·provided·similar·access·to·large·objects,·so·they·could·be·read·and·written·using·the·same·stream·classes.</p>
199	<p>This·functionality·was·considered·too·fragile·and·complex,·so·it·has·been·replaced·with·a·single,·much·simpler·class.·</p>	199	<p>This·functionality·was·considered·too·fragile·and·complex,·so·it·has·been·replaced·with·a·single,·much·simpler·class.·</p>
200	</div><h2·class="groupheader">Member·Data·Documentation</h2>	200	</div><h2·class="groupheader">Member·Data·Documentation</h2>
201	<a·id="a26bc8151792d7e058e7640022a95a4c1"·name="a26bc8151792d7e058e7640022a95a4c1"></a>	201	<a·id="a26bc8151792d7e058e7640022a95a4c1"·name="a26bc8151792d7e058e7640022a95a4c1"></a>
202	<h2·class="memtitle"><span·class="permalink"><a·href="#a26bc8151792d7e058e7640022a95a4c1">◆ </a></span>default_mode</h2>	202	<h2·class="memtitle"><span·class="permalink"><a·href="#a26bc8151792d7e058e7640022a95a4c1">◆ </a></span>default_mode</h2>

203	<div·class="memitem">	203	<div·class="memitem">


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238	<tr·class="separator:ae33a0403408df984ad0999eb9a33db30"><td·class="memSeparator"·colspan="2"> </td></tr>	238	<tr·class="separator:ae33a0403408df984ad0999eb9a33db30"><td·class="memSeparator"·colspan="2"> </td></tr>
239	<tr·class="memitem:a0f1c6e0804d1829c81efb76f39db7dd7"·id="r_a0f1c6e0804d1829c81efb76f39db7dd7"><td·class="memItemLeft"·align="right"·valign="top">bool </td><td·class="memItemRight"·valign="bottom"><a·class="el"·href="classpqxx_1_1largeobjectaccess.html#a0f1c6e0804d1829c81efb76f39db7dd7">operator>=</a>·(<a·class="el"·href="classpqxx_1_1largeobject.html">largeobject</a>·const·&other)·const</td></tr>	239	<tr·class="memitem:a0f1c6e0804d1829c81efb76f39db7dd7"·id="r_a0f1c6e0804d1829c81efb76f39db7dd7"><td·class="memItemLeft"·align="right"·valign="top">bool </td><td·class="memItemRight"·valign="bottom"><a·class="el"·href="classpqxx_1_1largeobjectaccess.html#a0f1c6e0804d1829c81efb76f39db7dd7">operator>=</a>·(<a·class="el"·href="classpqxx_1_1largeobject.html">largeobject</a>·const·&other)·const</td></tr>
240	<tr·class="memdesc:a0f1c6e0804d1829c81efb76f39db7dd7"><td·class="mdescLeft"> </td><td·class="mdescRight">Compare·object·identities.··<br·/></td></tr>	240	<tr·class="memdesc:a0f1c6e0804d1829c81efb76f39db7dd7"><td·class="mdescLeft"> </td><td·class="mdescRight">Compare·object·identities.··<br·/></td></tr>
241	<tr·class="separator:a0f1c6e0804d1829c81efb76f39db7dd7"><td·class="memSeparator"·colspan="2"> </td></tr>	241	<tr·class="separator:a0f1c6e0804d1829c81efb76f39db7dd7"><td·class="memSeparator"·colspan="2"> </td></tr>
242	</table>	242	</table>
243	<a·name="details"·id="details"></a><h2·class="groupheader">Detailed·Description</h2>	243	<a·name="details"·id="details"></a><h2·class="groupheader">Detailed·Description</h2>
244	<div·class="textblock"><p>Accessor·for·large·object's·contents.·</p>	244	<div·class="textblock"><p>Accessor·for·large·object's·contents.·</p>
245	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000039">Deprecated:</a></b></dt><dd>Use·the·<code>blob</code>·class·instead.·</dd></dl>	245	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000029">Deprecated:</a></b></dt><dd>Use·the·<code>blob</code>·class·instead.·</dd></dl>
246	</div><h2·class="groupheader">Member·Typedef·Documentation</h2>	246	</div><h2·class="groupheader">Member·Typedef·Documentation</h2>
247	<a·id="a6b09598014eca3c4c4b8a0c1495185d3"·name="a6b09598014eca3c4c4b8a0c1495185d3"></a>	247	<a·id="a6b09598014eca3c4c4b8a0c1495185d3"·name="a6b09598014eca3c4c4b8a0c1495185d3"></a>
248	<h2·class="memtitle"><span·class="permalink"><a·href="#a6b09598014eca3c4c4b8a0c1495185d3">◆ </a></span>openmode</h2>	248	<h2·class="memtitle"><span·class="permalink"><a·href="#a6b09598014eca3c4c4b8a0c1495185d3">◆ </a></span>openmode</h2>

249	<div·class="memitem">	249	<div·class="memitem">
250	<div·class="memproto">	250	<div·class="memproto">
251	······<table·class="memname">	251	······<table·class="memname">


Offset 137, 15 lines modified		Offset 137, 15 lines modified
137	</td><td·class="memItemRight"·valign="bottom"><b>errorhandler</b>·(<a·class="el"·href="classpqxx_1_1errorhandler.html">errorhandler</a>·const·&)=delete</td></tr>	137	</td><td·class="memItemRight"·valign="bottom"><b>errorhandler</b>·(<a·class="el"·href="classpqxx_1_1errorhandler.html">errorhandler</a>·const·&)=delete</td></tr>
138	<tr·class="separator:ae6e3073c572e5ed6190b640be8b08fa1·inherit·pub_methods_classpqxx_1_1errorhandler"><td·class="memSeparator"·colspan="2"> </td></tr>	138	<tr·class="separator:ae6e3073c572e5ed6190b640be8b08fa1·inherit·pub_methods_classpqxx_1_1errorhandler"><td·class="memSeparator"·colspan="2"> </td></tr>
139	<tr·class="memitem:ac52009eced624930fdecaa9594c89c28·inherit·pub_methods_classpqxx_1_1errorhandler"·id="r_ac52009eced624930fdecaa9594c89c28"><td·class="memItemLeft"·align="right"·valign="top">	139	<tr·class="memitem:ac52009eced624930fdecaa9594c89c28·inherit·pub_methods_classpqxx_1_1errorhandler"·id="r_ac52009eced624930fdecaa9594c89c28"><td·class="memItemLeft"·align="right"·valign="top">
140	<a·class="el"·href="classpqxx_1_1errorhandler.html">errorhandler</a>·& </td><td·class="memItemRight"·valign="bottom"><b>operator=</b>·(<a·class="el"·href="classpqxx_1_1errorhandler.html">errorhandler</a>·const·&)=delete</td></tr>	140	<a·class="el"·href="classpqxx_1_1errorhandler.html">errorhandler</a>·& </td><td·class="memItemRight"·valign="bottom"><b>operator=</b>·(<a·class="el"·href="classpqxx_1_1errorhandler.html">errorhandler</a>·const·&)=delete</td></tr>
141	<tr·class="separator:ac52009eced624930fdecaa9594c89c28·inherit·pub_methods_classpqxx_1_1errorhandler"><td·class="memSeparator"·colspan="2"> </td></tr>	141	<tr·class="separator:ac52009eced624930fdecaa9594c89c28·inherit·pub_methods_classpqxx_1_1errorhandler"><td·class="memSeparator"·colspan="2"> </td></tr>
142	</table>	142	</table>
143	<a·name="details"·id="details"></a><h2·class="groupheader">Detailed·Description</h2>	143	<a·name="details"·id="details"></a><h2·class="groupheader">Detailed·Description</h2>
144	<div·class="textblock"><dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000002">Deprecated:</a></b></dt><dd>Use·a·notice·handler·instead.·</dd></dl>	144	<div·class="textblock"><dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000005">Deprecated:</a></b></dt><dd>Use·a·notice·handler·instead.·</dd></dl>
145	</div><h2·class="groupheader">Member·Function·Documentation</h2>	145	</div><h2·class="groupheader">Member·Function·Documentation</h2>
146	<a·id="a051f8a9a1019974daffc47c75addc46e"·name="a051f8a9a1019974daffc47c75addc46e"></a>	146	<a·id="a051f8a9a1019974daffc47c75addc46e"·name="a051f8a9a1019974daffc47c75addc46e"></a>
147	<h2·class="memtitle"><span·class="permalink"><a·href="#a051f8a9a1019974daffc47c75addc46e">◆ </a></span>operator()()</h2>	147	<h2·class="memtitle"><span·class="permalink"><a·href="#a051f8a9a1019974daffc47c75addc46e">◆ </a></span>operator()()</h2>

148	<div·class="memitem">	148	<div·class="memitem">
149	<div·class="memproto">	149	<div·class="memproto">
150	<table·class="mlabels">	150	<table·class="mlabels">


Offset 67, 41 lines modified		Offset 67, 41 lines modified
67	··Member·_\x8p_\x8q_\x8x_\x8x_\x8:_\x8:_\x8r_\x8o_\x8w_\x8:_\x8:_\x8s_\x8l_\x8i_\x8c_\x8e·(size_type·sbegin,·size_type·send)·const	67	··Member·_\x8p_\x8q_\x8x_\x8x_\x8:_\x8:_\x8r_\x8o_\x8w_\x8:_\x8:_\x8s_\x8l_\x8i_\x8c_\x8e·(size_type·sbegin,·size_type·send)·const
68	······I·haven't·heard·of·anyone·caring·about·row·slicing·at·all·in·at·least·the	68	······I·haven't·heard·of·anyone·caring·about·row·slicing·at·all·in·at·least·the
69	······last·15·years.·Yet·it·adds·complexity,·so·unless·anyone·files·a·bug	69	······last·15·years.·Yet·it·adds·complexity,·so·unless·anyone·files·a·bug
70	······explaining·why·they·really·need·this·feature,·I'm·going·to·remove·it.	70	······explaining·why·they·really·need·this·feature,·I'm·going·to·remove·it.
71	······Even·if·they·do,·the·feature·may·need·an·update.	71	······Even·if·they·do,·the·feature·may·need·an·update.
72	··Class·_\x8p_\x8q_\x8x_\x8x_\x8:_\x8:_\x8s_\x8t_\x8r_\x8e_\x8a_\x8m_\x8__\x8f_\x8r_\x8o_\x8m	72	··Class·_\x8p_\x8q_\x8x_\x8x_\x8:_\x8:_\x8s_\x8t_\x8r_\x8e_\x8a_\x8m_\x8__\x8f_\x8r_\x8o_\x8m
73	······Use·_\x8t_\x8r_\x8a_\x8n_\x8s_\x8a_\x8c_\x8t_\x8i_\x8o_\x8n_\x8__\x8b_\x8a_\x8s_\x8e_\x8:_\x8:_\x8s_\x8t_\x8r_\x8e_\x8a_\x8m.	73	······Use·_\x8t_\x8r_\x8a_\x8n_\x8s_\x8a_\x8c_\x8t_\x8i_\x8o_\x8n_\x8__\x8b_\x8a_\x8s_\x8e_\x8:_\x8:_\x8s_\x8t_\x8r_\x8e_\x8a_\x8m.
74	··Member·_\x8p_\x8q_\x8x_\x8x_\x8:_\x8:_\x8s_\x8t_\x8r_\x8e_\x8a_\x8m_\x8__\x8f_\x8r_\x8o_\x8m_\x8:_\x8:_\x8s_\x8t_\x8r_\x8e_\x8a_\x8m_\x8__\x8f_\x8r_\x8o_\x8m·(_\x8t_\x8r_\x8a_\x8n_\x8s_\x8a_\x8c_\x8t_\x8i_\x8o_\x8n_\x8__\x8b_\x8a_\x8s_\x8e·&~~,·_.f_.r_.o_.m_.__.~~t_.~~a_.b~~_.l_.e~~_.__.t~~,	74	··Member·_\x8p_\x8q_\x8x_\x8x_\x8:_\x8:_\x8s_\x8t_\x8r_\x8e_\x8a_\x8m_\x8__\x8f_\x8r_\x8o_\x8m_\x8:_\x8:_\x8s_\x8t_\x8r_\x8e_\x8a_\x8m_\x8__\x8f_\x8r_\x8o_\x8m·(_\x8t_\x8r_\x8a_\x8n_\x8s_\x8a_\x8c_\x8t_\x8i_\x8o_\x8n_\x8__\x8b_\x8a_\x8s_\x8e·&tx,·std::string_view
75	··~~std::string_view·~~ta~~ble,·Iter·columns_~~b~~egin,·Iter·co~~l~~umns_~~end)	75	··table)
76	······Use·factories·_\x8t_\x8a_\x8b_\x8l_\x8e·or·_\x8r_\x8a_\x8w_\x8__\x8t_\x8a_\x8b_\x8l_\x8e·instead.	76	······Use·factories·_\x8t_\x8a_\x8b_\x8l_\x8e·or·_\x8r_\x8a_\x8w_\x8__\x8t_\x8a_\x8b_\x8l_\x8e·instead.
77	··Member·_\x8p_\x8q_\x8x_\x8x_\x8:_\x8:_\x8s_\x8t_\x8r_\x8e_\x8a_\x8m_\x8__\x8f_\x8r_\x8o_\x8m_\x8:_\x8:_\x8s_\x8t_\x8r_\x8e_\x8a_\x8m_\x8__\x8f_\x8r_\x8o_\x8m·(_\x8t_\x8r_\x8a_\x8n_\x8s_\x8a_\x8c_\x8t_\x8i_\x8o_\x8n_\x8__\x8b_\x8a_\x8s_\x8e·&,·std::string_view	77	··Member·_\x8p_\x8q_\x8x_\x8x_\x8:_\x8:_\x8s_\x8t_\x8r_\x8e_\x8a_\x8m_\x8__\x8f_\x8r_\x8o_\x8m_\x8:_\x8:_\x8s_\x8t_\x8r_\x8e_\x8a_\x8m_\x8__\x8f_\x8r_\x8o_\x8m·(_\x8t_\x8r_\x8a_\x8n_\x8s_\x8a_\x8c_\x8t_\x8i_\x8o_\x8n_\x8__\x8b_\x8a_\x8s_\x8e·&,·std::string_view
78	··table,·Iter·columns_begin,·Iter·columns_end)	78	··table,·Iter·columns_begin,·Iter·columns_end)
79	······Use·factories·_\x8t_\x8a_\x8b_\x8l_\x8e·or·_\x8r_\x8a_\x8w_\x8__\x8t_\x8a_\x8b_\x8l_\x8e·instead.	79	······Use·factories·_\x8t_\x8a_\x8b_\x8l_\x8e·or·_\x8r_\x8a_\x8w_\x8__\x8t_\x8a_\x8b_\x8l_\x8e·instead.
80	··Member·_\x8p_\x8q_\x8x_\x8x_\x8:_\x8:_\x8s_\x8t_\x8r_\x8e_\x8a_\x8m_\x8__\x8f_\x8r_\x8o_\x8m_\x8:_\x8:_\x8s_\x8t_\x8r_\x8e_\x8a_\x8m_\x8__\x8f_\x8r_\x8o_\x8m·(_\x8t_\x8r_\x8a_\x8n_\x8s_\x8a_\x8c_\x8t_\x8i_\x8o_\x8n_\x8__\x8b_\x8a_\x8s_\x8e·&tx,·std::string_view	80	··Member·_\x8p_\x8q_\x8x_\x8x_\x8:_\x8:_\x8s_\x8t_\x8r_\x8e_\x8a_\x8m_\x8__\x8f_\x8r_\x8o_\x8m_\x8:_\x8:_\x8s_\x8t_\x8r_\x8e_\x8a_\x8m_\x8__\x8f_\x8r_\x8o_\x8m·(_\x8t_\x8r_\x8a_\x8n_\x8s_\x8a_\x8c_\x8t_\x8i_\x8o_\x8n_\x8__\x8b_\x8a_\x8s_\x8e·&tx,·std::string_view
81	··table,·Columns·const·&columns)	81	··table,·Columns·const·&columns)
82	······Use·factories·_\x8t_\x8a_\x8b_\x8l_\x8e·or·_\x8r_\x8a_\x8w_\x8__\x8t_\x8a_\x8b_\x8l_\x8e·instead.	82	······Use·factories·_\x8t_\x8a_\x8b_\x8l_\x8e·or·_\x8r_\x8a_\x8w_\x8__\x8t_\x8a_\x8b_\x8l_\x8e·instead.
83	··Member·_\x8p_\x8q_\x8x_\x8x_\x8:_\x8:_\x8s_\x8t_\x8r_\x8e_\x8a_\x8m_\x8__\x8f_\x8r_\x8o_\x8m_\x8:_\x8:_\x8s_\x8t_\x8r_\x8e_\x8a_\x8m_\x8__\x8f_\x8r_\x8o_\x8m·(_\x8t_\x8r_\x8a_\x8n_\x8s_\x8a_\x8c_\x8t_\x8i_\x8o_\x8n_\x8__\x8b_\x8a_\x8s_\x8e·&tx,·std::string_view
84	··table)
85	······Use·factories·_\x8t_\x8a_\x8b_\x8l_\x8e·or·_\x8r_\x8a_\x8w_\x8__\x8t_\x8a_\x8b_\x8l_\x8e·instead.
86	··Member·_\x8p_\x8q_\x8x_\x8x_\x8:_\x8:_\x8s_\x8t_\x8r_\x8e_\x8a_\x8m_\x8__\x8f_\x8r_\x8o_\x8m_\x8:_\x8:_\x8s_\x8t_\x8r_\x8e_\x8a_\x8m_\x8__\x8f_\x8r_\x8o_\x8m·(_\x8t_\x8r_\x8a_\x8n_\x8s_\x8a_\x8c_\x8t_\x8i_\x8o_\x8n_\x8__\x8b_\x8a_\x8s_\x8e·&tx,·_\x8f_\x8r_\x8o_\x8m_\x8__\x8t_\x8a_\x8b_\x8l_\x8e_\x8__\x8t,	83	··Member·_\x8p_\x8q_\x8x_\x8x_\x8:_\x8:_\x8s_\x8t_\x8r_\x8e_\x8a_\x8m_\x8__\x8f_\x8r_\x8o_\x8m_\x8:_\x8:_\x8s_\x8t_\x8r_\x8e_\x8a_\x8m_\x8__\x8f_\x8r_\x8o_\x8m·(_\x8t_\x8r_\x8a_\x8n_\x8s_\x8a_\x8c_\x8t_\x8i_\x8o_\x8n_\x8__\x8b_\x8a_\x8s_\x8e·&tx,·_\x8f_\x8r_\x8o_\x8m_\x8__\x8t_\x8a_\x8b_\x8l_\x8e_\x8__\x8t,
87	··std::string_view·table,·Columns·const·&columns)	84	··std::string_view·table,·Columns·const·&columns)
88	······Use·factory·function·_\x8q_\x8u_\x8e_\x8r_\x8y·instead.	85	······Use·factory·function·_\x8q_\x8u_\x8e_\x8r_\x8y·instead.
89	··Member·_\x8p_\x8q_\x8x_\x8x_\x8:_\x8:_\x8s_\x8t_\x8r_\x8e_\x8a_\x8m_\x8__\x8f_\x8r_\x8o_\x8m_\x8:_\x8:_\x8s_\x8t_\x8r_\x8e_\x8a_\x8m_\x8__\x8f_\x8r_\x8o_\x8m·(_\x8t_\x8r_\x8a_\x8n_\x8s_\x8a_\x8c_\x8t_\x8i_\x8o_\x8n_\x8__\x8b_\x8a_\x8s_\x8e·&,·_\x8f_\x8r_\x8o_\x8m_\x8__\x8t_\x8a_\x8b_\x8l_\x8e_\x8__\x8t,	86	··Member·_\x8p_\x8q_\x8x_\x8x_\x8:_\x8:_\x8s_\x8t_\x8r_\x8e_\x8a_\x8m_\x8__\x8f_\x8r_\x8o_\x8m_\x8:_\x8:_\x8s_\x8t_\x8r_\x8e_\x8a_\x8m_\x8__\x8f_\x8r_\x8o_\x8m·(_\x8t_\x8r_\x8a_\x8n_\x8s_\x8a_\x8c_\x8t_\x8i_\x8o_\x8n_\x8__\x8b_\x8a_\x8s_\x8e·&,·_\x8f_\x8r_\x8o_\x8m_\x8__\x8t_\x8a_\x8b_\x8l_\x8e_\x8__\x8t,
		87	··std::string_view·table,·Iter·columns_begin,·Iter·columns_end)
		88	······Use·factories·_\x8t_\x8a_\x8b_\x8l_\x8e·or·_\x8r_\x8a_\x8w_\x8__\x8t_\x8a_\x8b_\x8l_\x8e·instead.
		89	··Member·_\x8p_\x8q_\x8x_\x8x_\x8:_\x8:_\x8s_\x8t_\x8r_\x8e_\x8a_\x8m_\x8__\x8f_\x8r_\x8o_\x8m_\x8:_\x8:_\x8s_\x8t_\x8r_\x8e_\x8a_\x8m_\x8__\x8f_\x8r_\x8o_\x8m·(_\x8t_\x8r_\x8a_\x8n_\x8s_\x8a_\x8c_\x8t_\x8i_\x8o_\x8n_\x8__\x8b_\x8a_\x8s_\x8e·&,·_\x8f_\x8r_\x8o_\x8m_\x8__\x8t_\x8a_\x8b_\x8l_\x8e_\x8__\x8t,
90	··std::string_view·table)	90	··std::string_view·table)
91	······Use·factories·_\x8t_\x8a_\x8b_\x8l_\x8e·or·_\x8r_\x8a_\x8w_\x8__\x8t_\x8a_\x8b_\x8l_\x8e·instead.	91	······Use·factories·_\x8t_\x8a_\x8b_\x8l_\x8e·or·_\x8r_\x8a_\x8w_\x8__\x8t_\x8a_\x8b_\x8l_\x8e·instead.
92	··Member·_\x8p_\x8q_\x8x_\x8x_\x8:_\x8:_\x8s_\x8t_\x8r_\x8e_\x8a_\x8m_\x8__\x8f_\x8r_\x8o_\x8m_\x8:_\x8:_\x8s_\x8t_\x8r_\x8e_\x8a_\x8m_\x8__\x8f_\x8r_\x8o_\x8m·(_\x8t_\x8r_\x8a_\x8n_\x8s_\x8a_\x8c_\x8t_\x8i_\x8o_\x8n_\x8__\x8b_\x8a_\x8s_\x8e·&,·_\x8f_\x8r_\x8o_\x8m_\x8__\x8q_\x8u_\x8e_\x8r_\x8y_\x8__\x8t,	92	··Member·_\x8p_\x8q_\x8x_\x8x_\x8:_\x8:_\x8s_\x8t_\x8r_\x8e_\x8a_\x8m_\x8__\x8f_\x8r_\x8o_\x8m_\x8:_\x8:_\x8s_\x8t_\x8r_\x8e_\x8a_\x8m_\x8__\x8f_\x8r_\x8o_\x8m·(_\x8t_\x8r_\x8a_\x8n_\x8s_\x8a_\x8c_\x8t_\x8i_\x8o_\x8n_\x8__\x8b_\x8a_\x8s_\x8e·&,·_\x8f_\x8r_\x8o_\x8m_\x8__\x8q_\x8u_\x8e_\x8r_\x8y_\x8__\x8t,
93	··std::string_view·query)	93	··std::string_view·query)
94	······Use·factory·function·_\x8q_\x8u_\x8e_\x8r_\x8y·instead.	94	······Use·factory·function·_\x8q_\x8u_\x8e_\x8r_\x8y·instead.
95	··Member·_\x8p_\x8q_\x8x_\x8x_\x8:_\x8:_\x8s_\x8t_\x8r_\x8e_\x8a_\x8m_\x8__\x8t_\x8o_\x8:_\x8:_\x8s_\x8t_\x8r_\x8e_\x8a_\x8m_\x8__\x8t_\x8o·(_\x8t_\x8r_\x8a_\x8n_\x8s_\x8a_\x8c_\x8t_\x8i_\x8o_\x8n_\x8__\x8b_\x8a_\x8s_\x8e·&,·std::string_view
96	··table_name,·Columns·const·&columns)
97	······Use·_\x8t_\x8a_\x8b_\x8l_\x8e·or·_\x8r_\x8a_\x8w_\x8__\x8t_\x8a_\x8b_\x8l_\x8e·as·a·factory.
98	··Member·_\x8p_\x8q_\x8x_\x8x_\x8:_\x8:_\x8s_\x8t_\x8r_\x8e_\x8a_\x8m_\x8__\x8t_\x8o_\x8:_\x8:_\x8s_\x8t_\x8r_\x8e_\x8a_\x8m_\x8__\x8t_\x8o·(_\x8t_\x8r_\x8a_\x8n_\x8s_\x8a_\x8c_\x8t_\x8i_\x8o_\x8n_\x8__\x8b_\x8a_\x8s_\x8e·&tx,·std::string_view	95	··Member·_\x8p_\x8q_\x8x_\x8x_\x8:_\x8:_\x8s_\x8t_\x8r_\x8e_\x8a_\x8m_\x8__\x8t_\x8o_\x8:_\x8:_\x8s_\x8t_\x8r_\x8e_\x8a_\x8m_\x8__\x8t_\x8o·(_\x8t_\x8r_\x8a_\x8n_\x8s_\x8a_\x8c_\x8t_\x8i_\x8o_\x8n_\x8__\x8b_\x8a_\x8s_\x8e·&tx,·std::string_view
99	··table_name)	96	··table_name)
100	······Use·_\x8t_\x8a_\x8b_\x8l_\x8e·or·_\x8r_\x8a_\x8w_\x8__\x8t_\x8a_\x8b_\x8l_\x8e·as·a·factory.	97	······Use·_\x8t_\x8a_\x8b_\x8l_\x8e·or·_\x8r_\x8a_\x8w_\x8__\x8t_\x8a_\x8b_\x8l_\x8e·as·a·factory.
		98	··Member·_\x8p_\x8q_\x8x_\x8x_\x8:_\x8:_\x8s_\x8t_\x8r_\x8e_\x8a_\x8m_\x8__\x8t_\x8o_\x8:_\x8:_\x8s_\x8t_\x8r_\x8e_\x8a_\x8m_\x8__\x8t_\x8o·(_\x8t_\x8r_\x8a_\x8n_\x8s_\x8a_\x8c_\x8t_\x8i_\x8o_\x8n_\x8__\x8b_\x8a_\x8s_\x8e·&,·std::string_view
		99	··table_name,·Columns·const·&columns)
		100	······Use·_\x8t_\x8a_\x8b_\x8l_\x8e·or·_\x8r_\x8a_\x8w_\x8__\x8t_\x8a_\x8b_\x8l_\x8e·as·a·factory.
101	··Member·_\x8p_\x8q_\x8x_\x8x_\x8:_\x8:_\x8s_\x8t_\x8r_\x8i_\x8p_\x8__\x8t	101	··Member·_\x8p_\x8q_\x8x_\x8x_\x8:_\x8:_\x8s_\x8t_\x8r_\x8i_\x8p_\x8__\x8t
102	······In·C++20·we'll·replace·this·with·std::remove_cvref.	102	······In·C++20·we'll·replace·this·with·std::remove_cvref.
103	··Member·_\x8p_\x8q_\x8x_\x8x_\x8:_\x8:_\x8t_\x8r_\x8a_\x8n_\x8s_\x8a_\x8c_\x8t_\x8i_\x8o_\x8n_\x8__\x8b_\x8a_\x8s_\x8e_\x8:_\x8:_\x8s_\x8e_\x8t_\x8__\x8v_\x8a_\x8r_\x8i_\x8a_\x8b_\x8l_\x8e·(std::string_view·var,·std::	103	··Member·_\x8p_\x8q_\x8x_\x8x_\x8:_\x8:_\x8t_\x8r_\x8a_\x8n_\x8s_\x8a_\x8c_\x8t_\x8i_\x8o_\x8n_\x8__\x8b_\x8a_\x8s_\x8e_\x8:_\x8:_\x8s_\x8e_\x8t_\x8__\x8v_\x8a_\x8r_\x8i_\x8a_\x8b_\x8l_\x8e·(std::string_view·var,·std::
104	··string_view·value)	104	··string_view·value)
105	······To·set·a·transaction-local·variable,·execute·an·SQL·SET·command.·To·set·a	105	······To·set·a·transaction-local·variable,·execute·an·SQL·SET·command.·To·set·a
106	······session·variable,·use·the·connection's·set_session_var·function.	106	······session·variable,·use·the·connection's·set_session_var·function.
107	····*·Generated·by·_\x8[_\x8d_\x8o_\x8x_\x8y_\x8g_\x8e_\x8n_\x8]1.9.8	107	····*·Generated·by·_\x8[_\x8d_\x8o_\x8x_\x8y_\x8g_\x8e_\x8n_\x8]1.9.8


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95	<div·class="contents">	95	<div·class="contents">
96	<div·class="textblock"><p>Writing·queries·as·strings·is·easy.·But·sometimes·you·need·a·variable·in·there:·‘"SELECT·id·FROM·user·WHERE·name·=·&rsquo;"·+·name·+·"'"`.</p>	96	<div·class="textblock"><p>Writing·queries·as·strings·is·easy.·But·sometimes·you·need·a·variable·in·there:·‘"SELECT·id·FROM·user·WHERE·name·=·&rsquo;"·+·name·+·"'"`.</p>
97	<p>This·is·dangerous.·See·the·bug?·If·<code>name</code>·can·contain·quotes,·you·may·have·an·SQL·injection·vulnerability·there,·where·users·can·enter·nasty·stuff·like·"`.';·DROP·TABLE·user`".·Or·if·you're·lucky,·it's·just·a·nasty·bug·that·you·discover·when·<code>name</code>·happens·to·be·"d'Arcy".·Or...·Well,·I·was·born·in·a·place·called·_'s-Gravenhage..._</p>	97	<p>This·is·dangerous.·See·the·bug?·If·<code>name</code>·can·contain·quotes,·you·may·have·an·SQL·injection·vulnerability·there,·where·users·can·enter·nasty·stuff·like·"`.';·DROP·TABLE·user`".·Or·if·you're·lucky,·it's·just·a·nasty·bug·that·you·discover·when·<code>name</code>·happens·to·be·"d'Arcy".·Or...·Well,·I·was·born·in·a·place·called·_'s-Gravenhage..._</p>
98	<p>There·are·two·ways·of·dealing·with·this.·One·is·statement·<a·class="el"·href="parameters.html">Statement·parameters</a>·—·many·SQL·execution·functions·in·libpqxx·let·you·write·<em>placeholders</em>·for·variable·values·in·your·SQL,·like·<code>$1</code>,·<code>$2</code>,·etc.·When·you·then·pass·your·variables·as·the·parameter·values,·they·get·substituted·into·the·query,·but·in·a·safe·form.</p>	98	<p>There·are·two·ways·of·dealing·with·this.·One·is·statement·<a·class="el"·href="parameters.html">Statement·parameters</a>·—·many·SQL·execution·functions·in·libpqxx·let·you·write·<em>placeholders</em>·for·variable·values·in·your·SQL,·like·<code>$1</code>,·<code>$2</code>,·etc.·When·you·then·pass·your·variables·as·the·parameter·values,·they·get·substituted·into·the·query,·but·in·a·safe·form.</p>
99	<p>The·other·is·to·<em>escape</em>·the·values·yourself,·before·inserting·them·into·your·SQL.·This·isn't·as·safe·as·using·parameters,·since·you·need·to·be·really·conscientious·about·it.·Use·<a·class="el"·href="parameters.html">Statement·parameters</a>·if·you·can...·and·libpqxx·will·do·the·escaping·for·you.</p>	99	<p>The·other·is·to·<em>escape</em>·the·values·yourself,·before·inserting·them·into·your·SQL.·This·isn't·as·safe·as·using·parameters,·since·you·need·to·be·really·conscientious·about·it.·Use·<a·class="el"·href="parameters.html">Statement·parameters</a>·if·you·can...·and·libpqxx·will·do·the·escaping·for·you.</p>
100	<p>In·escaping,·quotes·and·other·problematic·characters·are·marked·as·"this·is	100	<p>In·escaping,·quotes·and·other·problematic·characters·are·marked·as·"this·is
101	just·a·character·inside·the·string,·not·the·end·of·the·string."·There·are·<a·class="el"·href="group__escaping-functions.html">several·functions</a>·in·libpqxx·to·do·this·for·you.</p>	101	just·a·character·inside·the·string,·not·the·end·of·the·string."·There·are·<a·class="el"·href="group__escaping-functions.html">several·functions</a>·in·libpqxx·to·do·this·for·you.</p>
102	<h1><a·class="anchor"·id="autotoc_md25"></a>	102	<h1><a·class="anchor"·id="autotoc_md13"></a>
103	SQL·injection</h1>	103	SQL·injection</h1>
104	<p>To·understand·what·SQL·injection·vulnerabilities·are·and·why·they·should·be·prevented,·imagine·you·use·the·following·SQL·statement·somewhere·in·your·program:</p>	104	<p>To·understand·what·SQL·injection·vulnerabilities·are·and·why·they·should·be·prevented,·imagine·you·use·the·following·SQL·statement·somewhere·in·your·program:</p>
105	<div·class="fragment"><div·class="line">tx.exec(</div>	105	<div·class="fragment"><div·class="line">tx.exec(</div>
106	<div·class="line">····<span·class="stringliteral">"SELECT·number,·amount·"</span></div>	106	<div·class="line">····<span·class="stringliteral">"SELECT·number,·amount·"</span></div>
107	<div·class="line">····<span·class="stringliteral">"FROM·account·"</span></div>	107	<div·class="line">····<span·class="stringliteral">"FROM·account·"</span></div>
108	<div·class="line">····<span·class="stringliteral">"WHERE·allowed_to_see('"</span>·+·userid·+·<span·class="stringliteral">"','"</span>·+·password·+·<span·class="stringliteral">"')"</span>);</div>	108	<div·class="line">····<span·class="stringliteral">"WHERE·allowed_to_see('"</span>·+·userid·+·<span·class="stringliteral">"','"</span>·+·password·+·<span·class="stringliteral">"')"</span>);</div>
109	</div><!--·fragment·--><p>This·shows·a·logged-in·user·important·information·on·all·accounts·he·is·authorized·to·view.·The·userid·and·password·strings·are·variables·entered·by·the·user·himself.</p>	109	</div><!--·fragment·--><p>This·shows·a·logged-in·user·important·information·on·all·accounts·he·is·authorized·to·view.·The·userid·and·password·strings·are·variables·entered·by·the·user·himself.</p>
110	<p>Now,·if·the·user·is·actually·an·attacker·who·knows·(or·can·guess)·the·general·shape·of·this·SQL·statement,·imagine·getting·the·following·password:</p>	110	<p>Now,·if·the·user·is·actually·an·attacker·who·knows·(or·can·guess)·the·general·shape·of·this·SQL·statement,·imagine·getting·the·following·password:</p>
111	<div·class="fragment"><div·class="line">x')·OR·('x'·=·'x</div>	111	<div·class="fragment"><div·class="line">x')·OR·('x'·=·'x</div>
112	</div><!--·fragment·--><p>Does·that·make·sense·to·you?·Probably·not.·But·if·this·is·inserted·into·the·SQL·string·by·the·C++·code·above,·the·query·becomes:</p>	112	</div><!--·fragment·--><p>Does·that·make·sense·to·you?·Probably·not.·But·if·this·is·inserted·into·the·SQL·string·by·the·C++·code·above,·the·query·becomes:</p>
113	<div·class="fragment"><div·class="line"><span·class="keyword">SELECT</span>·number,·amount</div>	113	<div·class="fragment"><div·class="line"><span·class="keyword">SELECT</span>·number,·amount</div>
114	<div·class="line"><span·class="keyword">FROM</span>·account</div>	114	<div·class="line"><span·class="keyword">FROM</span>·account</div>
115	<div·class="line"><span·class="keyword">WHERE</span>·allowed_to_see(<span·class="stringliteral">'user'</span>,<span·class="stringliteral">'x'</span>)·<span·class="keyword">OR</span>·(<span·class="stringliteral">'x'</span>·=·<span·class="stringliteral">'x'</span>)</div>	115	<div·class="line"><span·class="keyword">WHERE</span>·allowed_to_see(<span·class="stringliteral">'user'</span>,<span·class="stringliteral">'x'</span>)·<span·class="keyword">OR</span>·(<span·class="stringliteral">'x'</span>·=·<span·class="stringliteral">'x'</span>)</div>
116	</div><!--·fragment·--><p>Is·this·what·you·wanted·to·happen?·Probably·not!·The·neat·<code>allowed_to_see()</code>·clause·is·completely·circumvented·by·the·"`OR·('x'·=·'x')`"·clause,·which·is·always·<code>true</code>.·Therefore,·the·attacker·will·get·to·see·all·accounts·in·the·database!</p>	116	</div><!--·fragment·--><p>Is·this·what·you·wanted·to·happen?·Probably·not!·The·neat·<code>allowed_to_see()</code>·clause·is·completely·circumvented·by·the·"`OR·('x'·=·'x')`"·clause,·which·is·always·<code>true</code>.·Therefore,·the·attacker·will·get·to·see·all·accounts·in·the·database!</p>
117	<h1><a·class="anchor"·id="autotoc_md26"></a>	117	<h1><a·class="anchor"·id="autotoc_md14"></a>
118	Using·the·esc·functions</h1>	118	Using·the·esc·functions</h1>
119	<p>Here's·how·you·can·fix·the·problem·in·the·example·above:</p>	119	<p>Here's·how·you·can·fix·the·problem·in·the·example·above:</p>
120	<div·class="fragment"><div·class="line">tx.exec(</div>	120	<div·class="fragment"><div·class="line">tx.exec(</div>
121	<div·class="line">····<span·class="stringliteral">"SELECT·number,·amount·"</span></div>	121	<div·class="line">····<span·class="stringliteral">"SELECT·number,·amount·"</span></div>
122	<div·class="line">····<span·class="stringliteral">"FROM·account·"</span></div>	122	<div·class="line">····<span·class="stringliteral">"FROM·account·"</span></div>
123	<div·class="line">····<span·class="stringliteral">"WHERE·allowed_to_see('"</span>·+·tx.esc(userid)·+·<span·class="stringliteral">"',·"</span></div>	123	<div·class="line">····<span·class="stringliteral">"WHERE·allowed_to_see('"</span>·+·tx.esc(userid)·+·<span·class="stringliteral">"',·"</span></div>
124	<div·class="line">····<span·class="stringliteral">"'"</span>·+·tx.esc(password)·+·<span·class="stringliteral">"')"</span>);</div>	124	<div·class="line">····<span·class="stringliteral">"'"</span>·+·tx.esc(password)·+·<span·class="stringliteral">"')"</span>);</div>


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21	·OUT·OF·OR·IN·CONNECTION·WITH·THE·SOFTWARE·OR·THE·USE·OR·OTHER·DEALINGS·IN·THE·SOFTWARE.	21	·OUT·OF·OR·IN·CONNECTION·WITH·THE·SOFTWARE·OR·THE·USE·OR·OTHER·DEALINGS·IN·THE·SOFTWARE.

22	·@licend··The·above·is·the·entire·license·notice·for·the·JavaScript·code·in·this·file	22	·@licend··The·above·is·the·entire·license·notice·for·the·JavaScript·code·in·this·file
23	*/	23	*/
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30	········]],	30	········]],
31	········["Binary·data",·"binary.html",·[	31	········["Binary·data",·"binary.html",·[
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33	········]],	33	········]],
34	········["Supporting·additional·data·types",·"datatypes.html",·[	34	········["Supporting·additional·data·types",·"datatypes.html",·[
35	············["Converting·types",·"datatypes.html#autotoc_md0",·null],	35	············["Converting·types",·"datatypes.html#autotoc_md1",·null],
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37	············["Your·type",·"datatypes.html#autotoc_md2",·null],	37	············["Your·type",·"datatypes.html#autotoc_md3",·null],
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42	················["<tt>to_buf</tt>",·"datatypes.html#autotoc_md7",·null],	42	················["<tt>to_buf</tt>",·"datatypes.html#autotoc_md8",·null],
43	················["<tt>into_buf</tt>",·"datatypes.html#autotoc_md8",·null],	43	················["<tt>into_buf</tt>",·"datatypes.html#autotoc_md9",·null],
44	················["<tt>size_buffer</tt>",·"datatypes.html#autotoc_md9",·null]	44	················["<tt>size_buffer</tt>",·"datatypes.html#autotoc_md10",·null]
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48	········]],	48	········]],
49	········["String·escaping",·"escaping.html",·[	49	········["String·escaping",·"escaping.html",·[
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51	············["Using·the·esc·functions",·"escaping.html#autotoc_md26",·null]	51	············["Using·the·esc·functions",·"escaping.html#autotoc_md14",·null]
52	········]],	52	········]],
53	········["Getting·started",·"getting-started.html",·null],	53	········["Getting·started",·"getting-started.html",·null],
54	········["Statement·parameters",·"parameters.html",·[	54	········["Statement·parameters",·"parameters.html",·[
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56	············["Generating·placeholders",·"parameters.html#autotoc_md28",·null]	56	············["Generating·placeholders",·"parameters.html#autotoc_md16",·null]
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59	········["Prepared·statements",·"prepared.html",·[	59	········["Prepared·statements",·"prepared.html",·[
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74	········["Deprecated·List",·"deprecated.html",·null],	74	········["Deprecated·List",·"deprecated.html",·null],
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101	</div><!--·fragment·--><p>Inserting·the·<code>101</code>·in·there·is·awkward·and·even·dangerous.·We'll·get·to·that·in·a·moment.·Here's·how·you·do·it·better,·using·parameters:</p>	101	</div><!--·fragment·--><p>Inserting·the·<code>101</code>·in·there·is·awkward·and·even·dangerous.·We'll·get·to·that·in·a·moment.·Here's·how·you·do·it·better,·using·parameters:</p>
102	<div·class="fragment"><div·class="line"><a·class="code·hl_class"·href="classpqxx_1_1result.html">pqxx::result</a>·r·=·tx.exec(<span·class="stringliteral">"SELECT·name·FROM·employee·WHERE·id=$1"</span>,·{101});</div>	102	<div·class="fragment"><div·class="line"><a·class="code·hl_class"·href="classpqxx_1_1result.html">pqxx::result</a>·r·=·tx.exec(<span·class="stringliteral">"SELECT·name·FROM·employee·WHERE·id=$1"</span>,·{101});</div>
103	</div><!--·fragment·--><p>That·second·argument·to·<code>exec()</code>,·the·<code>{101}</code>,·constructs·a·<code><a·class="el"·href="classpqxx_1_1params.html"·title="Build·a·parameter·list·for·a·parameterised·or·prepared·statement.">pqxx::params</a></code>·object.·The·<code>exec()</code>·call·will·fill·this·value·in·where·the·query·says·<code>$1</code>.</p>	103	</div><!--·fragment·--><p>That·second·argument·to·<code>exec()</code>,·the·<code>{101}</code>,·constructs·a·<code><a·class="el"·href="classpqxx_1_1params.html"·title="Build·a·parameter·list·for·a·parameterised·or·prepared·statement.">pqxx::params</a></code>·object.·The·<code>exec()</code>·call·will·fill·this·value·in·where·the·query·says·<code>$1</code>.</p>
104	<p>Doing·this·saves·you·work.·If·you·don't·use·statement·parameters,·you'll·need·to·quote·and·escape·your·values·(see·<code>connection::quote()</code>·and·friends)·as·you·insert·them·into·your·query·as·literal·values.</p>	104	<p>Doing·this·saves·you·work.·If·you·don't·use·statement·parameters,·you'll·need·to·quote·and·escape·your·values·(see·<code>connection::quote()</code>·and·friends)·as·you·insert·them·into·your·query·as·literal·values.</p>
105	<p>Or·if·you·forget·to·do·that,·you·leave·yourself·open·to·horrible·<a·href="https://xkcd.com/327/">SQL·injection·attacks</a>.·Trust·me,·I·was·born·in·a·town·whose·name·started·with·an·apostrophe!</p>	105	<p>Or·if·you·forget·to·do·that,·you·leave·yourself·open·to·horrible·<a·href="https://xkcd.com/327/">SQL·injection·attacks</a>.·Trust·me,·I·was·born·in·a·town·whose·name·started·with·an·apostrophe!</p>
106	<p>With·parameters·you·can·pass·your·values·as·they·are,·and·they·will·go·across·the·wire·to·the·database·in·a·safe·format.</p>	106	<p>With·parameters·you·can·pass·your·values·as·they·are,·and·they·will·go·across·the·wire·to·the·database·in·a·safe·format.</p>
107	<p>In·some·cases·it·may·even·be·faster!·When·a·parameter·represents·binary·data·(as·in·the·SQL·<code>BYTEA</code>·type),·libpqxx·will·send·it·directly·as·binary,·which·is·a·bit·more·efficient·than·the·standard·textual·format·in·which·the·data·normally·gets·sent·to·the·database.·If·you·insert·the·binary·data·directly·in·your·query·text,·your·CPU·will·have·some·extra·work·to·do,·converting·the·data·into·a·text·format,·escaping·it,·and·adding·quotes;·and·the·data·will·take·up·more·bytes,·which·take·time·to·transmit.</p>	107	<p>In·some·cases·it·may·even·be·faster!·When·a·parameter·represents·binary·data·(as·in·the·SQL·<code>BYTEA</code>·type),·libpqxx·will·send·it·directly·as·binary,·which·is·a·bit·more·efficient·than·the·standard·textual·format·in·which·the·data·normally·gets·sent·to·the·database.·If·you·insert·the·binary·data·directly·in·your·query·text,·your·CPU·will·have·some·extra·work·to·do,·converting·the·data·into·a·text·format,·escaping·it,·and·adding·quotes;·and·the·data·will·take·up·more·bytes,·which·take·time·to·transmit.</p>
108	<h1><a·class="anchor"·id="autotoc_md27"></a>	108	<h1><a·class="anchor"·id="autotoc_md15"></a>
109	Multiple·parameters</h1>	109	Multiple·parameters</h1>
110	<p>The·<code><a·class="el"·href="classpqxx_1_1params.html"·title="Build·a·parameter·list·for·a·parameterised·or·prepared·statement.">pqxx::params</a></code>·class·is·quite·fleixble.·It·can·contain·any·number·of·parameter·values,·of·many·different·types.</p>	110	<p>The·<code><a·class="el"·href="classpqxx_1_1params.html"·title="Build·a·parameter·list·for·a·parameterised·or·prepared·statement.">pqxx::params</a></code>·class·is·quite·fleixble.·It·can·contain·any·number·of·parameter·values,·of·many·different·types.</p>
111	<p>You·can·pass·them·in·while·constructing·the·<code>params</code>·object:</p>	111	<p>You·can·pass·them·in·while·constructing·the·<code>params</code>·object:</p>
112	<div·class="fragment"><div·class="line"><a·class="code·hl_class"·href="classpqxx_1_1params.html">pqxx::params</a>{23,·<span·class="stringliteral">"acceptance"</span>,·3.14159}</div>	112	<div·class="fragment"><div·class="line"><a·class="code·hl_class"·href="classpqxx_1_1params.html">pqxx::params</a>{23,·<span·class="stringliteral">"acceptance"</span>,·3.14159}</div>
113	<div·class="ttc"·id="aclasspqxx_1_1params_html"><div·class="ttname"><a·href="classpqxx_1_1params.html">pqxx::params</a></div><div·class="ttdoc">Build·a·parameter·list·for·a·parameterised·or·prepared·statement.</div><div·class="ttdef"><b>Definition</b>·params.hxx:33</div></div>	113	<div·class="ttc"·id="aclasspqxx_1_1params_html"><div·class="ttname"><a·href="classpqxx_1_1params.html">pqxx::params</a></div><div·class="ttdoc">Build·a·parameter·list·for·a·parameterised·or·prepared·statement.</div><div·class="ttdef"><b>Definition</b>·params.hxx:33</div></div>
114	</div><!--·fragment·--><p>Or·you·can·add·them·one·by·one:</p>	114	</div><!--·fragment·--><p>Or·you·can·add·them·one·by·one:</p>
115	<div·class="fragment"><div·class="line"><a·class="code·hl_class"·href="classpqxx_1_1params.html">pqxx::params</a>·p;</div>	115	<div·class="fragment"><div·class="line"><a·class="code·hl_class"·href="classpqxx_1_1params.html">pqxx::params</a>·p;</div>
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117	<div·class="line">p.<a·class="code·hl_function"·href="classpqxx_1_1params.html#ae53445f42f2698b93ba7860264ccea2e">append</a>(<span·class="stringliteral">"acceptance"</span>);</div>	117	<div·class="line">p.<a·class="code·hl_function"·href="classpqxx_1_1params.html#ae53445f42f2698b93ba7860264ccea2e">append</a>(<span·class="stringliteral">"acceptance"</span>);</div>
118	<div·class="line">p.<a·class="code·hl_function"·href="classpqxx_1_1params.html#ae53445f42f2698b93ba7860264ccea2e">append</a>(3.14159);</div>	118	<div·class="line">p.<a·class="code·hl_function"·href="classpqxx_1_1params.html#ae53445f42f2698b93ba7860264ccea2e">append</a>(3.14159);</div>
119	<div·class="ttc"·id="aclasspqxx_1_1params_html_ae53445f42f2698b93ba7860264ccea2e"><div·class="ttname"><a·href="classpqxx_1_1params.html#ae53445f42f2698b93ba7860264ccea2e">pqxx::params::append</a></div><div·class="ttdeci">void·append()·&</div><div·class="ttdoc">Append·a·null·value.</div><div·class="ttdef"><b>Definition</b>·params.cxx:32</div></div>	119	<div·class="ttc"·id="aclasspqxx_1_1params_html_ae53445f42f2698b93ba7860264ccea2e"><div·class="ttname"><a·href="classpqxx_1_1params.html#ae53445f42f2698b93ba7860264ccea2e">pqxx::params::append</a></div><div·class="ttdeci">void·append()·&</div><div·class="ttdoc">Append·a·null·value.</div><div·class="ttdef"><b>Definition</b>·params.cxx:32</div></div>
120	</div><!--·fragment·--><p>You·can·also·combine·the·two,·passing·some·values·int·the·constructor·and·adding·the·rest·later.·You·can·even·insert·a·<code>params</code>·into·a·<code>params</code>:</p>	120	</div><!--·fragment·--><p>You·can·also·combine·the·two,·passing·some·values·int·the·constructor·and·adding·the·rest·later.·You·can·even·insert·a·<code>params</code>·into·a·<code>params</code>:</p>
121	<div·class="fragment"><div·class="line"><a·class="code·hl_class"·href="classpqxx_1_1params.html">pqxx::params</a>·p{23};</div>	121	<div·class="fragment"><div·class="line"><a·class="code·hl_class"·href="classpqxx_1_1params.html">pqxx::params</a>·p{23};</div>
122	<div·class="line">p.<a·class="code·hl_function"·href="classpqxx_1_1params.html#ae53445f42f2698b93ba7860264ccea2e">append</a>(params{<span·class="stringliteral">"acceptance"</span>,·3.14159});</div>	122	<div·class="line">p.<a·class="code·hl_function"·href="classpqxx_1_1params.html#ae53445f42f2698b93ba7860264ccea2e">append</a>(params{<span·class="stringliteral">"acceptance"</span>,·3.14159});</div>
123	</div><!--·fragment·--><p>Each·of·these·examples·will·produce·the·same·list·of·parameters.</p>	123	</div><!--·fragment·--><p>Each·of·these·examples·will·produce·the·same·list·of·parameters.</p>
124	<h1><a·class="anchor"·id="autotoc_md28"></a>	124	<h1><a·class="anchor"·id="autotoc_md16"></a>
125	Generating·placeholders</h1>	125	Generating·placeholders</h1>
126	<p>If·your·code·gets·particularly·complex,·it·may·sometimes·happen·that·it·becomes·hard·to·track·which·parameter·value·belongs·with·which·placeholder.·Did·you·intend·to·pass·this·numeric·value·as·<code>$7</code>,·or·as·<code>$8</code>?·The·answer·may·depend·on·an·<code>if</code>·that·happened·earlier·in·a·different·function.</p>	126	<p>If·your·code·gets·particularly·complex,·it·may·sometimes·happen·that·it·becomes·hard·to·track·which·parameter·value·belongs·with·which·placeholder.·Did·you·intend·to·pass·this·numeric·value·as·<code>$7</code>,·or·as·<code>$8</code>?·The·answer·may·depend·on·an·<code>if</code>·that·happened·earlier·in·a·different·function.</p>
127	<p>(Generally·if·things·get·that·complex,·it's·a·good·idea·to·look·for·simpler·solutions.·But·especially·when·performance·matters,·sometimes·you·can't·avoid·complexity·like·that.)</p>	127	<p>(Generally·if·things·get·that·complex,·it's·a·good·idea·to·look·for·simpler·solutions.·But·especially·when·performance·matters,·sometimes·you·can't·avoid·complexity·like·that.)</p>
128	<p>There's·a·little·helper·class·called·<code>placeholders</code>.·You·can·use·it·as·a·counter·which·produces·those·placeholder·strings,·<code>$1</code>,·<code>$2</code>,·<code>$3</code>,·et·cetera.·When·you·start·generating·a·complex·statement,·you·can·create·both·a·<code>params</code>·and·a·<code>placeholders</code>:</p>	128	<p>There's·a·little·helper·class·called·<code>placeholders</code>.·You·can·use·it·as·a·counter·which·produces·those·placeholder·strings,·<code>$1</code>,·<code>$2</code>,·<code>$3</code>,·et·cetera.·When·you·start·generating·a·complex·statement,·you·can·create·both·a·<code>params</code>·and·a·<code>placeholders</code>:</p>
129	<div·class="fragment"><div·class="line"><a·class="code·hl_class"·href="classpqxx_1_1params.html">pqxx::params</a>·values;</div>	129	<div·class="fragment"><div·class="line"><a·class="code·hl_class"·href="classpqxx_1_1params.html">pqxx::params</a>·values;</div>
130	<div·class="line"><a·class="code·hl_class"·href="classpqxx_1_1placeholders.html">pqxx::placeholders</a>·name;</div>	130	<div·class="line"><a·class="code·hl_class"·href="classpqxx_1_1placeholders.html">pqxx::placeholders</a>·name;</div>
131	<div·class="ttc"·id="aclasspqxx_1_1placeholders_html"><div·class="ttname"><a·href="classpqxx_1_1placeholders.html">pqxx::placeholders</a></div><div·class="ttdoc">Generate·parameter·placeholders·for·use·in·an·SQL·statement.</div><div·class="ttdef"><b>Definition</b>·params.hxx:206</div></div>	131	<div·class="ttc"·id="aclasspqxx_1_1placeholders_html"><div·class="ttname"><a·href="classpqxx_1_1placeholders.html">pqxx::placeholders</a></div><div·class="ttdoc">Generate·parameter·placeholders·for·use·in·an·SQL·statement.</div><div·class="ttdef"><b>Definition</b>·params.hxx:206</div></div>


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91	<div><div·class="header">	91	<div><div·class="header">
92	··<div·class="headertitle"><div·class="title">Prepared·statements</div></div>	92	··<div·class="headertitle"><div·class="title">Prepared·statements</div></div>
93	</div><!--header-->	93	</div><!--header-->
94	<div·class="contents">	94	<div·class="contents">
95	<div·class="textblock"><p>Prepared·statements·are·SQL·queries·that·you·define·once·and·then·invoke·as·many·times·as·you·like,·typically·with·varying·parameters.·It's·a·lot·like·a·function·that·you·can·define·ad·hoc,·within·the·scope·of·one·connection.</p>	95	<div·class="textblock"><p>Prepared·statements·are·SQL·queries·that·you·define·once·and·then·invoke·as·many·times·as·you·like,·typically·with·varying·parameters.·It's·a·lot·like·a·function·that·you·can·define·ad·hoc,·within·the·scope·of·one·connection.</p>
96	<p>If·you·have·an·SQL·statement·that·you're·going·to·execute·many·times·in·quick·succession,·it·<em>may</em>·(but·see·below!)·be·more·efficient·to·prepare·it·once·and·reuse·it.·This·saves·the·database·backend·the·effort·of·parsing·the·SQL·and·figuring·out·an·efficient·execution·plan.</p>	96	<p>If·you·have·an·SQL·statement·that·you're·going·to·execute·many·times·in·quick·succession,·it·<em>may</em>·(but·see·below!)·be·more·efficient·to·prepare·it·once·and·reuse·it.·This·saves·the·database·backend·the·effort·of·parsing·the·SQL·and·figuring·out·an·efficient·execution·plan.</p>
97	<h1><a·class="anchor"·id="autotoc_md20"></a>	97	<h1><a·class="anchor"·id="autotoc_md17"></a>
98	Preparing·a·statement</h1>	98	Preparing·a·statement</h1>
99	<p>You·create·a·prepared·statement·by·preparing·it·on·the·connection·(using·the·<code><a·class="el"·href="classpqxx_1_1connection.html#add8ab06057cfd57e509c1e4e1f26e944"·title="Define·a·prepared·statement.">pqxx::connection::prepare</a></code>·functions),·passing·an·identifying·name·for·the·statement,·and·its·SQL·text.</p>	99	<p>You·create·a·prepared·statement·by·preparing·it·on·the·connection·(using·the·<code><a·class="el"·href="classpqxx_1_1connection.html#add8ab06057cfd57e509c1e4e1f26e944"·title="Define·a·prepared·statement.">pqxx::connection::prepare</a></code>·functions),·passing·an·identifying·name·for·the·statement,·and·its·SQL·text.</p>
100	<p>The·statement's·name·should·consist·of·ASCII·letters,·digits,·and·underscores·only,·and·start·with·an·ASCII·letter.·The·name·is·case-sensitive.</p>	100	<p>The·statement's·name·should·consist·of·ASCII·letters,·digits,·and·underscores·only,·and·start·with·an·ASCII·letter.·The·name·is·case-sensitive.</p>
101	<div·class="fragment"><div·class="line"><span·class="keywordtype">void</span>·prepare_my_statement(<a·class="code·hl_class"·href="classpqxx_1_1connection.html">pqxx::connection</a>·&cx)</div>	101	<div·class="fragment"><div·class="line"><span·class="keywordtype">void</span>·prepare_my_statement(<a·class="code·hl_class"·href="classpqxx_1_1connection.html">pqxx::connection</a>·&cx)</div>
102	<div·class="line">{</div>	102	<div·class="line">{</div>
103	<div·class="line">··cx.<a·class="code·hl_function"·href="classpqxx_1_1connection.html#add8ab06057cfd57e509c1e4e1f26e944">prepare</a>(</div>	103	<div·class="line">··cx.<a·class="code·hl_function"·href="classpqxx_1_1connection.html#add8ab06057cfd57e509c1e4e1f26e944">prepare</a>(</div>
104	<div·class="line">······<span·class="stringliteral">"my_statement"</span>,</div>	104	<div·class="line">······<span·class="stringliteral">"my_statement"</span>,</div>
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112	<div·class="line">{</div>	112	<div·class="line">{</div>
113	<div·class="line">··<span·class="keywordflow">return</span>·t.<a·class="code·hl_function"·href="group__transactions.html#adae522da46299d4cd7c48128403e7c93">exec</a>(<a·class="code·hl_class"·href="classpqxx_1_1prepped.html">pqxx::prepped</a>{<span·class="stringliteral">"my_statement"</span>});</div>	113	<div·class="line">··<span·class="keywordflow">return</span>·t.<a·class="code·hl_function"·href="group__transactions.html#adae522da46299d4cd7c48128403e7c93">exec</a>(<a·class="code·hl_class"·href="classpqxx_1_1prepped.html">pqxx::prepped</a>{<span·class="stringliteral">"my_statement"</span>});</div>
114	<div·class="line">}</div>	114	<div·class="line">}</div>
115	<div·class="ttc"·id="aclasspqxx_1_1prepped_html"><div·class="ttname"><a·href="classpqxx_1_1prepped.html">pqxx::prepped</a></div><div·class="ttdoc">A·string·that·is·the·name·of·a·prepared·statement.</div><div·class="ttdef"><b>Definition</b>·prepared_statement.hxx:70</div></div>	115	<div·class="ttc"·id="aclasspqxx_1_1prepped_html"><div·class="ttname"><a·href="classpqxx_1_1prepped.html">pqxx::prepped</a></div><div·class="ttdoc">A·string·that·is·the·name·of·a·prepared·statement.</div><div·class="ttdef"><b>Definition</b>·prepared_statement.hxx:70</div></div>
116	<div·class="ttc"·id="aclasspqxx_1_1result_html"><div·class="ttname"><a·href="classpqxx_1_1result.html">pqxx::result</a></div><div·class="ttdoc">Result·set·containing·data·returned·by·a·query·or·command.</div><div·class="ttdef"><b>Definition</b>·result.hxx:92</div></div>	116	<div·class="ttc"·id="aclasspqxx_1_1result_html"><div·class="ttname"><a·href="classpqxx_1_1result.html">pqxx::result</a></div><div·class="ttdoc">Result·set·containing·data·returned·by·a·query·or·command.</div><div·class="ttdef"><b>Definition</b>·result.hxx:92</div></div>
117	<div·class="ttc"·id="agroup__transactions_html_adae522da46299d4cd7c48128403e7c93"><div·class="ttname"><a·href="group__transactions.html#adae522da46299d4cd7c48128403e7c93">pqxx::transaction_base::exec</a></div><div·class="ttdeci">result·exec(std::string_view·query,·std::string_view·desc)</div><div·class="ttdoc">Execute·a·command.</div><div·class="ttdef"><b>Definition</b>·transaction_base.cxx:249</div></div>	117	<div·class="ttc"·id="agroup__transactions_html_adae522da46299d4cd7c48128403e7c93"><div·class="ttname"><a·href="group__transactions.html#adae522da46299d4cd7c48128403e7c93">pqxx::transaction_base::exec</a></div><div·class="ttdeci">result·exec(std::string_view·query,·std::string_view·desc)</div><div·class="ttdoc">Execute·a·command.</div><div·class="ttdef"><b>Definition</b>·transaction_base.cxx:249</div></div>
118	<div·class="ttc"·id="agroup__transactions_html_classpqxx_1_1transaction__base"><div·class="ttname"><a·href="group__transactions.html#classpqxx_1_1transaction__base">pqxx::transaction_base</a></div><div·class="ttdoc">Interface·definition·(and·common·code)·for·"transaction"·classes.</div><div·class="ttdef"><b>Definition</b>·transaction_base.hxx:151</div></div>	118	<div·class="ttc"·id="agroup__transactions_html_classpqxx_1_1transaction__base"><div·class="ttname"><a·href="group__transactions.html#classpqxx_1_1transaction__base">pqxx::transaction_base</a></div><div·class="ttdoc">Interface·definition·(and·common·code)·for·"transaction"·classes.</div><div·class="ttdef"><b>Definition</b>·transaction_base.hxx:151</div></div>
119	</div><!--·fragment·--><h1><a·class="anchor"·id="autotoc_md21"></a>	119	</div><!--·fragment·--><h1><a·class="anchor"·id="autotoc_md18"></a>
120	Parameters</h1>	120	Parameters</h1>
121	<p>You·can·pass·parameters·to·a·prepared·statemet,·just·like·you·can·with·a·regular·statement.·The·query·text·can·contain·<code>$1</code>,·<code>$2</code>·etc.·as·placeholders·for·parameter·values·that·you·will·provide·when·you·invoke·the·prepared·satement.</p>	121	<p>You·can·pass·parameters·to·a·prepared·statemet,·just·like·you·can·with·a·regular·statement.·The·query·text·can·contain·<code>$1</code>,·<code>$2</code>·etc.·as·placeholders·for·parameter·values·that·you·will·provide·when·you·invoke·the·prepared·satement.</p>
122	<p>See·<a·class="el"·href="parameters.html">Statement·parameters</a>·for·more·about·this.·And·here's·a·simple·example·of·preparing·a·statement·and·invoking·it·with·parameters:</p>	122	<p>See·<a·class="el"·href="parameters.html">Statement·parameters</a>·for·more·about·this.·And·here's·a·simple·example·of·preparing·a·statement·and·invoking·it·with·parameters:</p>
123	<div·class="fragment"><div·class="line"><span·class="keywordtype">void</span>·prepare_find(<a·class="code·hl_class"·href="classpqxx_1_1connection.html">pqxx::connection</a>·&cx)</div>	123	<div·class="fragment"><div·class="line"><span·class="keywordtype">void</span>·prepare_find(<a·class="code·hl_class"·href="classpqxx_1_1connection.html">pqxx::connection</a>·&cx)</div>
124	<div·class="line">{</div>	124	<div·class="line">{</div>
125	<div·class="line">··<span·class="comment">//·Prepare·a·statement·called·"find"·that·looks·for·employees·with·a</span></div>	125	<div·class="line">··<span·class="comment">//·Prepare·a·statement·called·"find"·that·looks·for·employees·with·a</span></div>
126	<div·class="line">··<span·class="comment">//·given·name·(parameter·1)·whose·salary·exceeds·a·given·number</span></div>	126	<div·class="line">··<span·class="comment">//·given·name·(parameter·1)·whose·salary·exceeds·a·given·number</span></div>
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131	<div·class="line">}</div>	131	<div·class="line">}</div>
132	</div><!--·fragment·--><p>This·example·looks·up·the·prepared·statement·"find,"·passes·<code>name</code>·and·<code>min_salary</code>·as·parameters,·and·invokes·the·statement·with·those·values:</p>	132	</div><!--·fragment·--><p>This·example·looks·up·the·prepared·statement·"find,"·passes·<code>name</code>·and·<code>min_salary</code>·as·parameters,·and·invokes·the·statement·with·those·values:</p>
133	<div·class="fragment"><div·class="line"><a·class="code·hl_class"·href="classpqxx_1_1result.html">pqxx::result</a>·execute_find(</div>	133	<div·class="fragment"><div·class="line"><a·class="code·hl_class"·href="classpqxx_1_1result.html">pqxx::result</a>·execute_find(</div>
134	<div·class="line">··<a·class="code·hl_class"·href="group__transactions.html#classpqxx_1_1transaction__base">pqxx::transaction_base</a>·&tx,·std::string·name,·<span·class="keywordtype">int</span>·min_salary)</div>	134	<div·class="line">··<a·class="code·hl_class"·href="group__transactions.html#classpqxx_1_1transaction__base">pqxx::transaction_base</a>·&tx,·std::string·name,·<span·class="keywordtype">int</span>·min_salary)</div>
135	<div·class="line">{</div>	135	<div·class="line">{</div>
136	<div·class="line">··<span·class="keywordflow">return</span>·tx.<a·class="code·hl_function"·href="group__transactions.html#adae522da46299d4cd7c48128403e7c93">exec</a>(<a·class="code·hl_class"·href="classpqxx_1_1prepped.html">pqxx::prepped</a>{<span·class="stringliteral">"find"</span>},·name,·min_salary);</div>	136	<div·class="line">··<span·class="keywordflow">return</span>·tx.<a·class="code·hl_function"·href="group__transactions.html#adae522da46299d4cd7c48128403e7c93">exec</a>(<a·class="code·hl_class"·href="classpqxx_1_1prepped.html">pqxx::prepped</a>{<span·class="stringliteral">"find"</span>},·name,·min_salary);</div>
137	<div·class="line">}</div>	137	<div·class="line">}</div>
138	</div><!--·fragment·--><h1><a·class="anchor"·id="autotoc_md22"></a>	138	</div><!--·fragment·--><h1><a·class="anchor"·id="autotoc_md19"></a>
139	A·special·prepared·statement</h1>	139	A·special·prepared·statement</h1>
140	<p>There·is·one·special·case:·the·<em>nameless</em>·prepared·statement.·You·may·prepare·a·statement·without·a·name,·i.e.·whose·name·is·an·empty·string.·The·unnamed·statement·can·be·redefined·at·any·time,·without·un-preparing·it·first.</p>	140	<p>There·is·one·special·case:·the·<em>nameless</em>·prepared·statement.·You·may·prepare·a·statement·without·a·name,·i.e.·whose·name·is·an·empty·string.·The·unnamed·statement·can·be·redefined·at·any·time,·without·un-preparing·it·first.</p>
141	<h1><a·class="anchor"·id="autotoc_md23"></a>	141	<h1><a·class="anchor"·id="autotoc_md20"></a>
142	Performance·note</h1>	142	Performance·note</h1>
143	<p>Don't·<em>assume</em>·that·using·prepared·statements·will·speed·up·your·application.·There·are·cases·where·prepared·statements·are·actually·slower·than·plain·SQL.</p>	143	<p>Don't·<em>assume</em>·that·using·prepared·statements·will·speed·up·your·application.·There·are·cases·where·prepared·statements·are·actually·slower·than·plain·SQL.</p>
144	<p>The·reason·is·that·the·backend·can·often·produce·a·better·execution·plan·when·it·knows·the·statement's·actual·parameter·values.</p>	144	<p>The·reason·is·that·the·backend·can·often·produce·a·better·execution·plan·when·it·knows·the·statement's·actual·parameter·values.</p>
145	<p>For·example,·say·you've·got·a·web·application·and·you're·querying·for·users·with·status·"inactive"·who·have·email·addresses·in·a·given·domain·name·X.·If·X·is·a·very·popular·provider,·the·best·way·for·the·database·engine·to·plan·the·query·may·be·to·list·the·inactive·users·first·and·then·filter·for·the·email·addresses·you're·looking·for.·But·in·other·cases,·it·may·be·much·faster·to·find·matching·email·addresses·first·and·then·see·which·of·their·owners·are·"inactive."·A·prepared·statement·must·be·planned·to·fit·either·case,·but·a·direct·query·will·be·optimised·based·on·table·statistics,·partial·indexes,·etc.</p>	145	<p>For·example,·say·you've·got·a·web·application·and·you're·querying·for·users·with·status·"inactive"·who·have·email·addresses·in·a·given·domain·name·X.·If·X·is·a·very·popular·provider,·the·best·way·for·the·database·engine·to·plan·the·query·may·be·to·list·the·inactive·users·first·and·then·filter·for·the·email·addresses·you're·looking·for.·But·in·other·cases,·it·may·be·much·faster·to·find·matching·email·addresses·first·and·then·see·which·of·their·owners·are·"inactive."·A·prepared·statement·must·be·planned·to·fit·either·case,·but·a·direct·query·will·be·optimised·based·on·table·statistics,·partial·indexes,·etc.</p>
146	<p>So,·as·with·any·optimisation...·measure·where·your·real·performance·problems·are·before·you·start·making·changes,·and·then·afterwards,·measure·whether·your·changes·actually·helped.·Don't·complicate·your·code·unless·it·solves·a·real·problem.·Knuth's·Law·applies.</p>	146	<p>So,·as·with·any·optimisation...·measure·where·your·real·performance·problems·are·before·you·start·making·changes,·and·then·afterwards,·measure·whether·your·changes·actually·helped.·Don't·complicate·your·code·unless·it·solves·a·real·problem.·Knuth's·Law·applies.</p>
147	<h1><a·class="anchor"·id="autotoc_md24"></a>	147	<h1><a·class="anchor"·id="autotoc_md21"></a>
148	Zero·bytes</h1>	148	Zero·bytes</h1>
149	<dl·class="section·warning"><dt>Warning</dt><dd>Beware·of·zero·("nul")·bytes!</dd></dl>	149	<dl·class="section·warning"><dt>Warning</dt><dd>Beware·of·zero·("nul")·bytes!</dd></dl>
150	<p>Since·libpqxx·is·a·wrapper·around·libpq,·the·C-level·client·library,·most·strings·you·pass·to·the·library·should·be·compatible·with·C-style·strings.·So·they·must·end·with·a·single·byte·with·value·0,·and·the·text·within·them·cannot·contain·any·such·zero·bytes.</p>	150	<p>Since·libpqxx·is·a·wrapper·around·libpq,·the·C-level·client·library,·most·strings·you·pass·to·the·library·should·be·compatible·with·C-style·strings.·So·they·must·end·with·a·single·byte·with·value·0,·and·the·text·within·them·cannot·contain·any·such·zero·bytes.</p>
151	<p>(The·<code><a·class="el"·href="classpqxx_1_1zview.html"·title="Marker-type·wrapper:·zero-terminated·std::string_view.">pqxx::zview</a></code>·type·exists·specifically·to·tell·libpqxx:·"this·is·a	151	<p>(The·<code><a·class="el"·href="classpqxx_1_1zview.html"·title="Marker-type·wrapper:·zero-terminated·std::string_view.">pqxx::zview</a></code>·type·exists·specifically·to·tell·libpqxx:·"this·is·a
152	C-compatible·string,·containing·no·zero·bytes·but·ending·in·a·zero·byte.")</p>	152	C-compatible·string,·containing·no·zero·bytes·but·ending·in·a·zero·byte.")</p>
153	<p>One·example·is·prepared·statement·names.·But·the·same·also·goes·for·the·parameters·values.·Any·string·you·pass·as·a·parameter·will·end·at·the·<em>first·char·with·value·zero.</em>·If·you·pass·a·string·that·contains·a·zero·byte,·the·last·byte·in·the·value·will·be·the·one·just·before·the·zero.</p>	153	<p>One·example·is·prepared·statement·names.·But·the·same·also·goes·for·the·parameters·values.·Any·string·you·pass·as·a·parameter·will·end·at·the·<em>first·char·with·value·zero.</em>·If·you·pass·a·string·that·contains·a·zero·byte,·the·last·byte·in·the·value·will·be·the·one·just·before·the·zero.</p>
154	<p>So,·if·you·need·a·zero·byte·in·a·string,·consider·that·it's·really·a·<em>binary·string,</em>·which·is·not·the·same·thing·as·a·text·string.·SQL·represents·binary·data·as·the·<code>BYTEA</code>·type,·or·in·binary·large·objects·("blobs").</p>	154	<p>So,·if·you·need·a·zero·byte·in·a·string,·consider·that·it's·really·a·<em>binary·string,</em>·which·is·not·the·same·thing·as·a·text·string.·SQL·represents·binary·data·as·the·<code>BYTEA</code>·type,·or·in·binary·large·objects·("blobs").</p>


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