/usr/bin/diffoscope --timeout 7200 --html /srv/reproducible-results/rbuild-debian/r-b-build.PcrvfZou/libpqxx_7.9.1-2.diffoscope.html --text /srv/reproducible-results/rbuild-debian/r-b-build.PcrvfZou/libpqxx_7.9.1-2.diffoscope.txt --json /srv/reproducible-results/rbuild-debian/r-b-build.PcrvfZou/libpqxx_7.9.1-2.diffoscope.json --profile=- /srv/reproducible-results/rbuild-debian/r-b-build.PcrvfZou/b1/libpqxx_7.9.1-2_armhf.changes /srv/reproducible-results/rbuild-debian/r-b-build.PcrvfZou/b2/libpqxx_7.9.1-2

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1	·cab63651c49119dc9e3158d3ed918b77·2407376·debug·optional·libpqxx-7.9-dbgsym_7.9.1-2_armhf.deb	1	·cab63651c49119dc9e3158d3ed918b77·2407376·debug·optional·libpqxx-7.9-dbgsym_7.9.1-2_armhf.deb
2	·5d2725ccb9dd0c16397291436cae8922·176532·libs·optional·libpqxx-7.9_7.9.1-2_armhf.deb	2	·5d2725ccb9dd0c16397291436cae8922·176532·libs·optional·libpqxx-7.9_7.9.1-2_armhf.deb
3	·13edd2fbed23ffedf95ad54024c11d5f·362284·libdevel·optional·libpqxx-dev_7.9.1-2_armhf.deb	3	·13edd2fbed23ffedf95ad54024c11d5f·362284·libdevel·optional·libpqxx-dev_7.9.1-2_armhf.deb
4	·b9~~fb3~~6397b20d4ed~~fa8a~~278bede~~57d0~~5·2602~~872~~·doc·optional·libpqxx-doc_7.9.1-2_all.deb	4	·989c02c864657340a6d1499247fb09ea·2602948·doc·optional·libpqxx-doc_7.9.1-2_all.deb

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183	··········<td>(</td>	183	··········<td>(</td>
184	··········<td·class="paramtype"><a·class="el"·href="group__escaping-functions.html#classpqxx_1_1binarystring">binarystring</a>·const·& </td>	184	··········<td·class="paramtype"><a·class="el"·href="group__escaping-functions.html#classpqxx_1_1binarystring">binarystring</a>·const·& </td>
185	··········<td·class="paramname"><em>value</em></td><td>)</td>	185	··········<td·class="paramname"><em>value</em></td><td>)</td>
186	··········<td>·&</td>	186	··········<td>·&</td>
187	········</tr>	187	········</tr>
188	······</table>	188	······</table>
189	</div><div·class="memdoc">	189	</div><div·class="memdoc">
190	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000012">Deprecated:</a></b></dt><dd>Append·binarystring·parameter.·</dd></dl>	190	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000014">Deprecated:</a></b></dt><dd>Append·binarystring·parameter.·</dd></dl>
191	<p>The·binarystring·must·stay·valid·for·as·long·as·the·<code>params</code>·remains·active.·</p>	191	<p>The·binarystring·must·stay·valid·for·as·long·as·the·<code>params</code>·remains·active.·</p>

192	</div>	192	</div>
193	</div>	193	</div>
194	<a·id="a60b0a2f320c12b241e429865faf5bfdf"·name="a60b0a2f320c12b241e429865faf5bfdf"></a>	194	<a·id="a60b0a2f320c12b241e429865faf5bfdf"·name="a60b0a2f320c12b241e429865faf5bfdf"></a>
195	<h2·class="memtitle"><span·class="permalink"><a·href="#a60b0a2f320c12b241e429865faf5bfdf">◆ </a></span>append()·<span·class="overload">[2/6]</span></h2>	195	<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_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#_deprecated000035">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#_deprecated000023">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#_deprecated000025">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#_deprecated000026">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#_deprecated000026">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#_deprecated000028">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#_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>	293	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000030">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#_deprecated000028">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#_deprecated000032">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">
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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#_deprecated000029">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#_deprecated000033">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#_deprecated000030">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#_deprecated000034">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#_deprecated000031">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#_deprecated000035">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#_deprecated000032">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#_deprecated000036">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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223	<span·class="mlabels"><span·class="mlabel">inline</span></span>··</td>	223	<span·class="mlabels"><span·class="mlabel">inline</span></span>··</td>
224	··</tr>	224	··</tr>
225	</table>	225	</table>
226	</div><div·class="memdoc">	226	</div><div·class="memdoc">

227	<p>Create·a·stream,·without·specifying·columns.·</p>	227	<p>Create·a·stream,·without·specifying·columns.·</p>
228	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000036">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>	228	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000027">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>
229	<p>Fields·will·be·inserted·in·whatever·order·the·columns·have·in·the·database.</p>	229	<p>Fields·will·be·inserted·in·whatever·order·the·columns·have·in·the·database.</p>
230	<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>	230	<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>

231	</div>	231	</div>
232	</div>	232	</div>
233	<a·id="a3491f56118589adff7b7fc214689ad67"·name="a3491f56118589adff7b7fc214689ad67"></a>	233	<a·id="a3491f56118589adff7b7fc214689ad67"·name="a3491f56118589adff7b7fc214689ad67"></a>
234	<h2·class="memtitle"><span·class="permalink"><a·href="#a3491f56118589adff7b7fc214689ad67">◆ </a></span>stream_to()·<span·class="overload">[2/3]</span></h2>	234	<h2·class="memtitle"><span·class="permalink"><a·href="#a3491f56118589adff7b7fc214689ad67">◆ </a></span>stream_to()·<span·class="overload">[2/3]</span></h2>
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271	··<td·class="mlabels-right">	271	··<td·class="mlabels-right">
272	<span·class="mlabels"><span·class="mlabel">inline</span></span>··</td>	272	<span·class="mlabels"><span·class="mlabel">inline</span></span>··</td>
273	··</tr>	273	··</tr>
274	</table>	274	</table>
275	</div><div·class="memdoc">	275	</div><div·class="memdoc">

276	<p>Create·a·stream,·specifying·column·names·as·a·container·of·strings.·</p>	276	<p>Create·a·stream,·specifying·column·names·as·a·container·of·strings.·</p>
277	<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__to.html#a34d7ca93963c0b5733a9ebcc10f2429b">table</a>·or·<a·class="el"·href="classpqxx_1_1stream__to.html#a05279e61c463fb48a4182eea47f8f531">raw_table</a>·as·a·factory.·</dd></dl>	277	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000029">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>

278	</div>	278	</div>
279	</div>	279	</div>
280	<a·id="af7d4df107f7c1db0bff89a61ae5df7a3"·name="af7d4df107f7c1db0bff89a61ae5df7a3"></a>	280	<a·id="af7d4df107f7c1db0bff89a61ae5df7a3"·name="af7d4df107f7c1db0bff89a61ae5df7a3"></a>
281	<h2·class="memtitle"><span·class="permalink"><a·href="#af7d4df107f7c1db0bff89a61ae5df7a3">◆ </a></span>stream_to()·<span·class="overload">[3/3]</span></h2>	281	<h2·class="memtitle"><span·class="permalink"><a·href="#af7d4df107f7c1db0bff89a61ae5df7a3">◆ </a></span>stream_to()·<span·class="overload">[3/3]</span></h2>

282	<div·class="memitem">	282	<div·class="memitem">
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325	<span·class="mlabels"><span·class="mlabel">inline</span></span>··</td>	325	<span·class="mlabels"><span·class="mlabel">inline</span></span>··</td>
326	··</tr>	326	··</tr>
327	</table>	327	</table>
328	</div><div·class="memdoc">	328	</div><div·class="memdoc">

329	<p>Create·a·stream,·specifying·column·names·as·a·sequence·of·strings.·</p>	329	<p>Create·a·stream,·specifying·column·names·as·a·sequence·of·strings.·</p>
330	<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__to.html#a34d7ca93963c0b5733a9ebcc10f2429b">table</a>·or·<a·class="el"·href="classpqxx_1_1stream__to.html#a05279e61c463fb48a4182eea47f8f531">raw_table</a>·as·a·factory.·</dd></dl>	330	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000031">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>

331	</div>	331	</div>
332	</div>	332	</div>
333	<h2·class="groupheader">Member·Function·Documentation</h2>	333	<h2·class="groupheader">Member·Function·Documentation</h2>
334	<a·id="a6284b8a32d0841436e1761b449287788"·name="a6284b8a32d0841436e1761b449287788"></a>	334	<a·id="a6284b8a32d0841436e1761b449287788"·name="a6284b8a32d0841436e1761b449287788"></a>
335	<h2·class="memtitle"><span·class="permalink"><a·href="#a6284b8a32d0841436e1761b449287788">◆ </a></span>complete()</h2>	335	<h2·class="memtitle"><span·class="permalink"><a·href="#a6284b8a32d0841436e1761b449287788">◆ </a></span>complete()</h2>

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1915	<span·class="mlabels"><span·class="mlabel">constexpr</span></span>··</td>	1915	<span·class="mlabels"><span·class="mlabel">constexpr</span></span>··</td>
1916	··</tr>	1916	··</tr>
1917	</table>	1917	</table>
1918	</div><div·class="memdoc">	1918	</div><div·class="memdoc">

1919	<p>Pass·this·to·a·<code><a·class="el"·href="classpqxx_1_1stream__from.html"·title="Stream·data·from·the·database.">stream_from</a></code>·constructor·to·stream·query·results.·</p>	1919	<p>Pass·this·to·a·<code><a·class="el"·href="classpqxx_1_1stream__from.html"·title="Stream·data·from·the·database.">stream_from</a></code>·constructor·to·stream·query·results.·</p>
1920	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000024">Deprecated:</a></b></dt><dd>Use·<a·class="el"·href="group__transactions.html#aec4d0f102c2c0fab8fa1a48f452abc0f"·title="Execute·a·query,·in·streaming·fashion;·loop·over·the·results·row·by·row.">transaction_base::stream</a>·instead·of·<a·class="el"·href="classpqxx_1_1stream__from.html"·title="Stream·data·from·the·database.">stream_from</a>.·</dd></dl>	1920	<dl·class="deprecated"><dt><b><a·class="el"·href="deprecated.html#_deprecated000025">Deprecated:</a></b></dt><dd>Use·<a·class="el"·href="group__transactions.html#aec4d0f102c2c0fab8fa1a48f452abc0f"·title="Execute·a·query,·in·streaming·fashion;·loop·over·the·results·row·by·row.">transaction_base::stream</a>·instead·of·<a·class="el"·href="classpqxx_1_1stream__from.html"·title="Stream·data·from·the·database.">stream_from</a>.·</dd></dl>

1921	</div>	1921	</div>
1922	</div>	1922	</div>
1923	<a·id="a66648ed503eb162846c41247daa32660"·name="a66648ed503eb162846c41247daa32660"></a>	1923	<a·id="a66648ed503eb162846c41247daa32660"·name="a66648ed503eb162846c41247daa32660"></a>
1924	<h2·class="memtitle"><span·class="permalink"><a·href="#a66648ed503eb162846c41247daa32660">◆ </a></span>from_table</h2>	1924	<h2·class="memtitle"><span·class="permalink"><a·href="#a66648ed503eb162846c41247daa32660">◆ </a></span>from_table</h2>

1925	<div·class="memitem">	1925	<div·class="memitem">
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1939	··<td·class="mlabels-right">	1939	··<td·class="mlabels-right">
1940	<span·class="mlabels"><span·class="mlabel">constexpr</span></span>··</td>	1940	<span·class="mlabels"><span·class="mlabel">constexpr</span></span>··</td>
1941	··</tr>	1941	··</tr>
1942	</table>	1942	</table>
1943	</div><div·class="memdoc">	1943	</div><div·class="memdoc">

1944	<p>Pass·this·to·a·<code><a·class="el"·href="classpqxx_1_1stream__from.html"·title="Stream·data·from·the·database.">stream_from</a></code>·constructor·to·stream·table·contents.·</p>	1944	<p>Pass·this·to·a·<code><a·class="el"·href="classpqxx_1_1stream__from.html"·title="Stream·data·from·the·database.">stream_from</a></code>·constructor·to·stream·table·contents.·</p>
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91	<div·class="header">	91	<div·class="header">
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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_md1"></a>	100	<h1><a·class="anchor"·id="autotoc_md0"></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_md2"></a>	111	<h1><a·class="anchor"·id="autotoc_md1"></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_md3"></a>	123	<h1><a·class="anchor"·id="autotoc_md2"></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>


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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_md0"></a>	110	</div><!--·fragment·--><h1><a·class="anchor"·id="autotoc_md3"></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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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#_deprecated000016">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#_deprecated000017">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#_deprecated000018">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#_deprecated000019">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>

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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#_deprecated000017">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#_deprecated000018">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">


Offset 190, 15 lines modified		Offset 190, 15 lines modified
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#_deprecated000015">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#_deprecated000016">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#_deprecated000014">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#_deprecated000015">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 22, 18 lines modified		Offset 22, 18 lines modified
22	······take·and·return·std::span<std::byte>.	22	······take·and·return·std::span<std::byte>.
23	··Member·_\x8p_\x8q_\x8x_\x8x_\x8:_\x8:_\x8c_\x8o_\x8n_\x8n_\x8e_\x8c_\x8t_\x8i_\x8o_\x8n_\x8:_\x8:_\x8s_\x8e_\x8t_\x8__\x8v_\x8a_\x8r_\x8i_\x8a_\x8b_\x8l_\x8e·(std::string_view·var,·std::string_view	23	··Member·_\x8p_\x8q_\x8x_\x8x_\x8:_\x8:_\x8c_\x8o_\x8n_\x8n_\x8e_\x8c_\x8t_\x8i_\x8o_\x8n_\x8:_\x8:_\x8s_\x8e_\x8t_\x8__\x8v_\x8a_\x8r_\x8i_\x8a_\x8b_\x8l_\x8e·(std::string_view·var,·std::string_view
24	··value)·&	24	··value)·&
25	······To·set·a·session·variable,·use·_\x8s_\x8e_\x8t_\x8__\x8s_\x8e_\x8s_\x8s_\x8i_\x8o_\x8n_\x8__\x8v_\x8a_\x8r.·To·set·a·transaction-	25	······To·set·a·session·variable,·use·_\x8s_\x8e_\x8t_\x8__\x8s_\x8e_\x8s_\x8s_\x8i_\x8o_\x8n_\x8__\x8v_\x8a_\x8r.·To·set·a·transaction-
26	······local·variable,·execute·an·SQL·SET·command.	26	······local·variable,·execute·an·SQL·SET·command.
27	··Member·_\x8p_\x8q_\x8x_\x8x_\x8:_\x8:_\x8c_\x8o_\x8n_\x8n_\x8e_\x8c_\x8t_\x8i_\x8o_\x8n_\x8__\x8b_\x8a_\x8s_\x8e	27	··Member·_\x8p_\x8q_\x8x_\x8x_\x8:_\x8:_\x8c_\x8o_\x8n_\x8n_\x8e_\x8c_\x8t_\x8i_\x8o_\x8n_\x8__\x8b_\x8a_\x8s_\x8e
28	······Old·base·class·for·connection.·They·are·now·the·same·class.	28	······Old·base·class·for·connection.·They·are·now·the·same·class.
29	··Member·_\x8p_\x8q_\x8x_\x8x_\x8:_\x8:_\x8e_\x8n_\x8c_\x8r_\x8y_\x8p_\x8t_\x8__\x8p_\x8a_\x8s_\x8s_\x8w_\x8o_\x8r_\x8d·(zview·user,·zview·password)
30	······Use·_\x8c_\x8o_\x8n_\x8n_\x8e_\x8c_\x8t_\x8i_\x8o_\x8n_\x8:_\x8:_\x8e_\x8n_\x8c_\x8r_\x8y_\x8p_\x8t_\x8__\x8p_\x8a_\x8s_\x8s_\x8w_\x8o_\x8r_\x8d·instead.
31	··Member·_\x8p_\x8q_\x8x_\x8x_\x8:_\x8:_\x8e_\x8n_\x8c_\x8r_\x8y_\x8p_\x8t_\x8__\x8p_\x8a_\x8s_\x8s_\x8w_\x8o_\x8r_\x8d·(char·const·user[],·char·const·password[])	29	··Member·_\x8p_\x8q_\x8x_\x8x_\x8:_\x8:_\x8e_\x8n_\x8c_\x8r_\x8y_\x8p_\x8t_\x8__\x8p_\x8a_\x8s_\x8s_\x8w_\x8o_\x8r_\x8d·(char·const·user[],·char·const·password[])
32	······Use·_\x8c_\x8o_\x8n_\x8n_\x8e_\x8c_\x8t_\x8i_\x8o_\x8n_\x8:_\x8:_\x8e_\x8n_\x8c_\x8r_\x8y_\x8p_\x8t_\x8__\x8p_\x8a_\x8s_\x8s_\x8w_\x8o_\x8r_\x8d·instead.	30	······Use·_\x8c_\x8o_\x8n_\x8n_\x8e_\x8c_\x8t_\x8i_\x8o_\x8n_\x8:_\x8:_\x8e_\x8n_\x8c_\x8r_\x8y_\x8p_\x8t_\x8__\x8p_\x8a_\x8s_\x8s_\x8w_\x8o_\x8r_\x8d·instead.
		31	··Member·_\x8p_\x8q_\x8x_\x8x_\x8:_\x8:_\x8e_\x8n_\x8c_\x8r_\x8y_\x8p_\x8t_\x8__\x8p_\x8a_\x8s_\x8s_\x8w_\x8o_\x8r_\x8d·(zview·user,·zview·password)
		32	······Use·_\x8c_\x8o_\x8n_\x8n_\x8e_\x8c_\x8t_\x8i_\x8o_\x8n_\x8:_\x8:_\x8e_\x8n_\x8c_\x8r_\x8y_\x8p_\x8t_\x8__\x8p_\x8a_\x8s_\x8s_\x8w_\x8o_\x8r_\x8d·instead.
33	··Member·_\x8p_\x8q_\x8x_\x8x_\x8:_\x8:_\x8f_\x8i_\x8e_\x8l_\x8d_\x8s_\x8t_\x8r_\x8e_\x8a_\x8m	33	··Member·_\x8p_\x8q_\x8x_\x8x_\x8:_\x8:_\x8f_\x8i_\x8e_\x8l_\x8d_\x8s_\x8t_\x8r_\x8e_\x8a_\x8m
34	······Read·a·field·using·_\x8f_\x8i_\x8e_\x8l_\x8d_\x8:_\x8:_\x8a_\x8s<...>()·or·_\x8f_\x8i_\x8e_\x8l_\x8d_\x8:_\x8:_\x8c_\x8__\x8s_\x8t_\x8r_\x8(_\x8).	34	······Read·a·field·using·_\x8f_\x8i_\x8e_\x8l_\x8d_\x8:_\x8:_\x8a_\x8s<...>()·or·_\x8f_\x8i_\x8e_\x8l_\x8d_\x8:_\x8:_\x8c_\x8__\x8s_\x8t_\x8r_\x8(_\x8).
35	··Member·_\x8p_\x8q_\x8x_\x8x_\x8:_\x8:_\x8f_\x8r_\x8o_\x8m_\x8__\x8q_\x8u_\x8e_\x8r_\x8y	35	··Member·_\x8p_\x8q_\x8x_\x8x_\x8:_\x8:_\x8f_\x8r_\x8o_\x8m_\x8__\x8q_\x8u_\x8e_\x8r_\x8y
36	······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·instead·of·_\x8s_\x8t_\x8r_\x8e_\x8a_\x8m_\x8__\x8f_\x8r_\x8o_\x8m.	36	······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·instead·of·_\x8s_\x8t_\x8r_\x8e_\x8a_\x8m_\x8__\x8f_\x8r_\x8o_\x8m.
37	··Struct·_\x8p_\x8q_\x8x_\x8x_\x8:_\x8:_\x8f_\x8r_\x8o_\x8m_\x8__\x8q_\x8u_\x8e_\x8r_\x8y_\x8__\x8t	37	··Struct·_\x8p_\x8q_\x8x_\x8x_\x8:_\x8:_\x8f_\x8r_\x8o_\x8m_\x8__\x8q_\x8u_\x8e_\x8r_\x8y_\x8__\x8t
38	······Use·_\x8s_\x8t_\x8r_\x8e_\x8a_\x8m_\x8__\x8f_\x8r_\x8o_\x8m_\x8:_\x8:_\x8q_\x8u_\x8e_\x8r_\x8y_\x8(_\x8)·instead.	38	······Use·_\x8s_\x8t_\x8r_\x8e_\x8a_\x8m_\x8__\x8f_\x8r_\x8o_\x8m_\x8:_\x8:_\x8q_\x8u_\x8e_\x8r_\x8y_\x8(_\x8)·instead.
39	··Member·_\x8p_\x8q_\x8x_\x8x_\x8:_\x8:_\x8f_\x8r_\x8o_\x8m_\x8__\x8t_\x8a_\x8b_\x8l_\x8e	39	··Member·_\x8p_\x8q_\x8x_\x8x_\x8:_\x8:_\x8f_\x8r_\x8o_\x8m_\x8__\x8t_\x8a_\x8b_\x8l_\x8e
Offset 59, 43 lines modified		Offset 59, 43 lines modified
59	··Member·_\x8p_\x8q_\x8x_\x8x_\x8:_\x8:_\x8r_\x8o_\x8w_\x8:_\x8:_\x8s_\x8l_\x8i_\x8c_\x8e·(size_type·sbegin,·size_type·send)·const	59	··Member·_\x8p_\x8q_\x8x_\x8x_\x8:_\x8:_\x8r_\x8o_\x8w_\x8:_\x8:_\x8s_\x8l_\x8i_\x8c_\x8e·(size_type·sbegin,·size_type·send)·const
60	······I·haven't·heard·of·anyone·caring·about·row·slicing·at·all·in·at·least·the	60	······I·haven't·heard·of·anyone·caring·about·row·slicing·at·all·in·at·least·the
61	······last·15·years.·Yet·it·adds·complexity,·so·unless·anyone·files·a·bug	61	······last·15·years.·Yet·it·adds·complexity,·so·unless·anyone·files·a·bug
62	······explaining·why·they·really·need·this·feature,·I'm·going·to·remove·it.	62	······explaining·why·they·really·need·this·feature,·I'm·going·to·remove·it.
63	······Even·if·they·do,·the·feature·may·need·an·update.	63	······Even·if·they·do,·the·feature·may·need·an·update.
64	··Class·_\x8p_\x8q_\x8x_\x8x_\x8:_\x8:_\x8s_\x8t_\x8r_\x8e_\x8a_\x8m_\x8__\x8f_\x8r_\x8o_\x8m	64	··Class·_\x8p_\x8q_\x8x_\x8x_\x8:_\x8:_\x8s_\x8t_\x8r_\x8e_\x8a_\x8m_\x8__\x8f_\x8r_\x8o_\x8m
65	······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.	65	······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.
66	··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_.a_.b_.l_.e_\x8__\x8t,	66	··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_.u_.e_.r_.y_\x8__\x8t,
67	··std::string_view·table,·Iter·columns_begin,·Iter·columns_end)
68	··~~····U~~s~~e·fac~~to~~rie~~s~~·_.~~t~~_.a_.b_.l_.e·o~~r·~~_.r~~_.~~a_.~~w~~_.__.t_.a_.b_.l_.e~~·inste~~ad.~~	67	··std::string_view·query)
		68	······Use·factory·function·_\x8q_\x8u_\x8e_\x8r_\x8y·instead.
69	··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	69	··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
70	··table,·Iter·columns_begin,·Iter·columns_end)	70	··table,·Iter·columns_begin,·Iter·columns_end)
71	······Use·factories·_\x8t_\x8a_\x8b_\x8l_\x8e·or·_\x8r_\x8a_\x8w_\x8__\x8t_\x8a_\x8b_\x8l_\x8e·instead.	71	······Use·factories·_\x8t_\x8a_\x8b_\x8l_\x8e·or·_\x8r_\x8a_\x8w_\x8__\x8t_\x8a_\x8b_\x8l_\x8e·instead.
72	··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	72	··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
73	··table,·Columns·const·&columns)	73	··table,·Columns·const·&columns)
74	······Use·factories·_\x8t_\x8a_\x8b_\x8l_\x8e·or·_\x8r_\x8a_\x8w_\x8__\x8t_\x8a_\x8b_\x8l_\x8e·instead.	74	······Use·factories·_\x8t_\x8a_\x8b_\x8l_\x8e·or·_\x8r_\x8a_\x8w_\x8__\x8t_\x8a_\x8b_\x8l_\x8e·instead.
75	··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	··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
76	··table)	76	··table)
77	······Use·factories·_\x8t_\x8a_\x8b_\x8l_\x8e·or·_\x8r_\x8a_\x8w_\x8__\x8t_\x8a_\x8b_\x8l_\x8e·instead.	77	······Use·factories·_\x8t_\x8a_\x8b_\x8l_\x8e·or·_\x8r_\x8a_\x8w_\x8__\x8t_\x8a_\x8b_\x8l_\x8e·instead.
78	··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,	78	··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,
79	··std::string_view·table,·Columns·const·&columns)	79	··std::string_view·table,·Columns·const·&columns)
80	······Use·factory·function·_\x8q_\x8u_\x8e_\x8r_\x8y·instead.	80	······Use·factory·function·_\x8q_\x8u_\x8e_\x8r_\x8y·instead.
81	··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,	81	··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,
		82	··std::string_view·table,·Iter·columns_begin,·Iter·columns_end)
		83	······Use·factories·_\x8t_\x8a_\x8b_\x8l_\x8e·or·_\x8r_\x8a_\x8w_\x8__\x8t_\x8a_\x8b_\x8l_\x8e·instead.
		84	··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,
82	··std::string_view·table)	85	··std::string_view·table)
83	······Use·factories·_\x8t_\x8a_\x8b_\x8l_\x8e·or·_\x8r_\x8a_\x8w_\x8__\x8t_\x8a_\x8b_\x8l_\x8e·instead.	86	······Use·factories·_\x8t_\x8a_\x8b_\x8l_\x8e·or·_\x8r_\x8a_\x8w_\x8__\x8t_\x8a_\x8b_\x8l_\x8e·instead.
84	··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,
85	··std::string_view·query)
86	······Use·factory·function·_\x8q_\x8u_\x8e_\x8r_\x8y·instead.
87	··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	87	··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
88	··table_name)	88	··table_name,·Iter·columns_begin,·Iter·columns_end)
89	······Use·_\x8t_\x8a_\x8b_\x8l_\x8e·or·_\x8r_\x8a_\x8w_\x8__\x8t_\x8a_\x8b_\x8l_\x8e·as·a·factory.	89	······Use·_\x8t_\x8a_\x8b_\x8l_\x8e·or·_\x8r_\x8a_\x8w_\x8__\x8t_\x8a_\x8b_\x8l_\x8e·as·a·factory.
90	··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	90	··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
91	··table_name,·Columns·const·&columns)	91	··table_name,·Columns·const·&columns)
92	······Use·_\x8t_\x8a_\x8b_\x8l_\x8e·or·_\x8r_\x8a_\x8w_\x8__\x8t_\x8a_\x8b_\x8l_\x8e·as·a·factory.	92	······Use·_\x8t_\x8a_\x8b_\x8l_\x8e·or·_\x8r_\x8a_\x8w_\x8__\x8t_\x8a_\x8b_\x8l_\x8e·as·a·factory.
93	··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	93	··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
94	··table_name~~,·Iter·columns_begin,·Iter·columns_end~~)	94	··table_name)
95	······Use·_\x8t_\x8a_\x8b_\x8l_\x8e·or·_\x8r_\x8a_\x8w_\x8__\x8t_\x8a_\x8b_\x8l_\x8e·as·a·factory.	95	······Use·_\x8t_\x8a_\x8b_\x8l_\x8e·or·_\x8r_\x8a_\x8w_\x8__\x8t_\x8a_\x8b_\x8l_\x8e·as·a·factory.
96	··Member·_\x8p_\x8q_\x8x_\x8x_\x8:_\x8:_\x8s_\x8t_\x8r_\x8i_\x8p_\x8__\x8t	96	··Member·_\x8p_\x8q_\x8x_\x8x_\x8:_\x8:_\x8s_\x8t_\x8r_\x8i_\x8p_\x8__\x8t
97	······In·C++20·we'll·replace·this·with·std::remove_cvref.	97	······In·C++20·we'll·replace·this·with·std::remove_cvref.
98	··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::	98	··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::
99	··string_view·value)	99	··string_view·value)
100	······To·set·a·transaction-local·variable,·execute·an·SQL·SET·command.·To·set·a	100	······To·set·a·transaction-local·variable,·execute·an·SQL·SET·command.·To·set·a
101	······session·variable,·use·the·connection's·set_session_var·function.	101	······session·variable,·use·the·connection's·set_session_var·function.


Offset 21, 52 lines modified		Offset 21, 52 lines modified
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	*/
24	var·NAVTREE·=·[	24	var·NAVTREE·=·[
25	····["libpqxx",·"index.html",·[	25	····["libpqxx",·"index.html",·[
26	········["Accessing·results·and·result·rows",·"accessing-results.html",·[	26	········["Accessing·results·and·result·rows",·"accessing-results.html",·[
27	············["Querying·rows·of·data",·"accessing-results.html#autotoc_md1",·null],	27	············["Querying·rows·of·data",·"accessing-results.html#autotoc_md0",·null],
28	············["Streaming·rows",·"accessing-results.html#autotoc_md2",·null],	28	············["Streaming·rows",·"accessing-results.html#autotoc_md1",·null],
29	············["Results·with·metadata",·"accessing-results.html#autotoc_md3",·null]	29	············["Results·with·metadata",·"accessing-results.html#autotoc_md2",·null]
30	········]],	30	········]],
31	········["Binary·data",·"binary.html",·[	31	········["Binary·data",·"binary.html",·[
32	············["Caveats",·"binary.html#autotoc_md0",·null]	32	············["Caveats",·"binary.html#autotoc_md3",·null]
33	········]],	33	········]],
34	········["Supporting·additional·data·types",·"datatypes.html",·[	34	········["Supporting·additional·data·types",·"datatypes.html",·[
35	············["Converting·types",·"datatypes.html#autotoc_md8",·null],	35	············["Converting·types",·"datatypes.html#autotoc_md6",·null],
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49	········["String·escaping",·"escaping.html",·[	49	········["String·escaping",·"escaping.html",·[
50	············["SQL·injection",·"escaping.html#autotoc_md4",·null],	50	············["SQL·injection",·"escaping.html#autotoc_md4",·null],
51	············["Using·the·esc·functions",·"escaping.html#autotoc_md5",·null]	51	············["Using·the·esc·functions",·"escaping.html#autotoc_md5",·null]
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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_md7",·null]	56	············["Generating·placeholders",·"parameters.html#autotoc_md19",·null]
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58	········["Performance·features",·"performance.html",·null],	58	········["Performance·features",·"performance.html",·null],
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61	············["Parameters",·"prepared.html#autotoc_md14",·null],	61	············["Parameters",·"prepared.html#autotoc_md21",·null],
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71	············["Streaming·data·<em>into·a·table</em>",·"streams.html#autotoc_md28",·null]	71	············["Streaming·data·<em>into·a·table</em>",·"streams.html#autotoc_md28",·null]


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95	<div·class="contents">	95	<div·class="contents">
96	<div·class="textblock"><p>When·you·execute·a·prepared·statement·(see·<a·class="el"·href="prepared.html">Prepared·statements</a>),·or·a·parameterised·statement·(using·functions·like·<code>pqxx::connection::exec_params</code>),·you·may·write·special·<em>placeholders</em>·in·the·query·text.·They·look·like·<code>$1</code>,·<code>$2</code>,·and·so·on.</p>	96	<div·class="textblock"><p>When·you·execute·a·prepared·statement·(see·<a·class="el"·href="prepared.html">Prepared·statements</a>),·or·a·parameterised·statement·(using·functions·like·<code>pqxx::connection::exec_params</code>),·you·may·write·special·<em>placeholders</em>·in·the·query·text.·They·look·like·<code>$1</code>,·<code>$2</code>,·and·so·on.</p>
97	<p>If·you·execute·the·query·and·pass·parameter·values,·the·call·will·respectively·substitute·the·first·where·it·finds·<code>$1</code>,·the·second·where·it·finds·<code>$2</code>,·et·cetera.</p>	97	<p>If·you·execute·the·query·and·pass·parameter·values,·the·call·will·respectively·substitute·the·first·where·it·finds·<code>$1</code>,·the·second·where·it·finds·<code>$2</code>,·et·cetera.</p>
98	<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>	98	<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>
99	<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>	99	<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>
100	<p>Statement·parameters·save·you·this·work.·With·these·parameters·you·can·pass·your·values·as-is,·and·they·will·go·across·the·wire·to·the·database·in·a·safe·format.</p>	100	<p>Statement·parameters·save·you·this·work.·With·these·parameters·you·can·pass·your·values·as-is,·and·they·will·go·across·the·wire·to·the·database·in·a·safe·format.</p>
101	<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.·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.</p>	101	<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.·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.</p>
102	<h1><a·class="anchor"·id="autotoc_md6"></a>	102	<h1><a·class="anchor"·id="autotoc_md18"></a>
103	Dynamic·parameter·lists</h1>	103	Dynamic·parameter·lists</h1>
104	<p>In·rare·cases·you·may·just·not·know·how·many·parameters·you'll·pass·into·your·statement·when·you·call·it.</p>	104	<p>In·rare·cases·you·may·just·not·know·how·many·parameters·you'll·pass·into·your·statement·when·you·call·it.</p>
105	<p>For·these·situations,·have·a·look·at·<code>params</code>.·It·lets·you·compose·your·parameters·list·on·the·fly,·even·add·whole·ranges·of·parameters·at·a·time.</p>	105	<p>For·these·situations,·have·a·look·at·<code>params</code>.·It·lets·you·compose·your·parameters·list·on·the·fly,·even·add·whole·ranges·of·parameters·at·a·time.</p>
106	<p>You·can·pass·a·<code>params</code>·into·your·statement·as·a·normal·parameter.·It·will·fill·in·all·the·parameter·values·it·contains·into·that·position·of·the·statement's·overall·parameter·list.</p>	106	<p>You·can·pass·a·<code>params</code>·into·your·statement·as·a·normal·parameter.·It·will·fill·in·all·the·parameter·values·it·contains·into·that·position·of·the·statement's·overall·parameter·list.</p>
107	<p>So·if·you·call·your·statement·passing·a·regular·parameter·<code>a</code>,·a·<code>params</code>·containing·just·a·parameter·<code>b</code>,·and·another·regular·parameter·<code>c</code>,·then·your·call·will·pass·parameters·<code>a</code>,·<code>b</code>,·and·<code>c</code>.·Or·if·the·params·object·is·empty,·it·will·pass·just·<code>a</code>·and·<code>c</code>.·If·the·params·object·contains·<code>x</code>·and·<code>y</code>,·your·call·will·pass·<code>a,·x,·y,·c</code>.</p>	107	<p>So·if·you·call·your·statement·passing·a·regular·parameter·<code>a</code>,·a·<code>params</code>·containing·just·a·parameter·<code>b</code>,·and·another·regular·parameter·<code>c</code>,·then·your·call·will·pass·parameters·<code>a</code>,·<code>b</code>,·and·<code>c</code>.·Or·if·the·params·object·is·empty,·it·will·pass·just·<code>a</code>·and·<code>c</code>.·If·the·params·object·contains·<code>x</code>·and·<code>y</code>,·your·call·will·pass·<code>a,·x,·y,·c</code>.</p>
108	<p>You·can·mix·static·and·dynamic·parameters·freely.·Don't·go·overboard·though:·complexity·is·where·bugs·happen!</p>	108	<p>You·can·mix·static·and·dynamic·parameters·freely.·Don't·go·overboard·though:·complexity·is·where·bugs·happen!</p>
109	<h1><a·class="anchor"·id="autotoc_md7"></a>	109	<h1><a·class="anchor"·id="autotoc_md19"></a>
110	Generating·placeholders</h1>	110	Generating·placeholders</h1>
111	<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>	111	<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>
112	<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>	112	<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>
113	<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>	113	<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>
114	<div·class="fragment"><div·class="line"><a·class="code·hl_class"·href="classpqxx_1_1params.html">pqxx::params</a>·values;</div>	114	<div·class="fragment"><div·class="line"><a·class="code·hl_class"·href="classpqxx_1_1params.html">pqxx::params</a>·values;</div>
115	<div·class="line"><a·class="code·hl_class"·href="classpqxx_1_1placeholders.html">pqxx::placeholders</a>·name;</div>	115	<div·class="line"><a·class="code·hl_class"·href="classpqxx_1_1placeholders.html">pqxx::placeholders</a>·name;</div>
116	<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:46</div></div>	116	<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:46</div></div>


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Offset 93, 52 lines modified		Offset 93, 52 lines modified
93	··<div·class="headertitle"><div·class="title">Supporting·additional·data·types</div></div>	93	··<div·class="headertitle"><div·class="title">Supporting·additional·data·types</div></div>
94	</div><!--header-->	94	</div><!--header-->
95	<div·class="contents">	95	<div·class="contents">
96	<div·class="textblock"><p>Communication·with·the·database·mostly·happens·in·a·text·format.·When·you·include·an·integer·value·in·a·query,·either·you·use·<code>to_string</code>·to·convert·it·to·that·text·format,·or·under·the·bonnet,·libpqxx·does·it·for·you.·When·you·get·a·query·result·field·"as·a·float,"·libpqxx·converts·from·the·text·format·to·a·floating-point·type.·These·conversions·are·everywhere·in·libpqxx.</p>	96	<div·class="textblock"><p>Communication·with·the·database·mostly·happens·in·a·text·format.·When·you·include·an·integer·value·in·a·query,·either·you·use·<code>to_string</code>·to·convert·it·to·that·text·format,·or·under·the·bonnet,·libpqxx·does·it·for·you.·When·you·get·a·query·result·field·"as·a·float,"·libpqxx·converts·from·the·text·format·to·a·floating-point·type.·These·conversions·are·everywhere·in·libpqxx.</p>
97	<p>The·conversion·system·supports·many·built-in·types,·but·it·is·also·extensible.·You·can·"teach"·libpqxx·(in·the·scope·of·your·own·application)·to·convert·additional·types·of·values·to·and·from·PostgreSQL's·string·format.</p>	97	<p>The·conversion·system·supports·many·built-in·types,·but·it·is·also·extensible.·You·can·"teach"·libpqxx·(in·the·scope·of·your·own·application)·to·convert·additional·types·of·values·to·and·from·PostgreSQL's·string·format.</p>
98	<p>This·is·massively·useful,·but·it's·not·for·the·faint·of·heart.·You'll·need·to·specialise·some·templates.·And,·<b>the·API·for·doing·this·can·change·with·any·major·libpqxx·release.</b></p>	98	<p>This·is·massively·useful,·but·it's·not·for·the·faint·of·heart.·You'll·need·to·specialise·some·templates.·And,·<b>the·API·for·doing·this·can·change·with·any·major·libpqxx·release.</b></p>
99	<p>If·that·happens,·your·code·may·fail·to·compile·with·the·newer·libpqxx·version,·and·you'll·have·to·go·through·the·<code>NEWS</code>·file·to·find·the·API·changes.·Usually·it'll·be·a·small·change,·like·an·additional·function·you·need·to·implement,·or·a·constant·you·need·to·define.</p>	99	<p>If·that·happens,·your·code·may·fail·to·compile·with·the·newer·libpqxx·version,·and·you'll·have·to·go·through·the·<code>NEWS</code>·file·to·find·the·API·changes.·Usually·it'll·be·a·small·change,·like·an·additional·function·you·need·to·implement,·or·a·constant·you·need·to·define.</p>
100	<h1><a·class="anchor"·id="autotoc_md8"></a>	100	<h1><a·class="anchor"·id="autotoc_md6"></a>
101	Converting·types</h1>	101	Converting·types</h1>
102	<p>In·your·application,·a·conversion·is·driven·entirely·by·a·C++·type·you·specify.·The·value's·SQL·type·on·the·database·side·has·nothing·to·do·with·it.·Nor·is·there·anything·in·the·string·that·would·identify·its·type.·Your·code·says·"convert·to·this·type"·and·libpqxx·does·it.</p>	102	<p>In·your·application,·a·conversion·is·driven·entirely·by·a·C++·type·you·specify.·The·value's·SQL·type·on·the·database·side·has·nothing·to·do·with·it.·Nor·is·there·anything·in·the·string·that·would·identify·its·type.·Your·code·says·"convert·to·this·type"·and·libpqxx·does·it.</p>
103	<p>So,·if·you've·SELECTed·a·64-bit·integer·from·the·database,·and·you·try·to·convert·it·to·a·C++·<code>short,</code>·one·of·two·things·will·happen:·either·the·number·is·small·enough·to·fit·in·your·<code>short</code>·and·it·just·works,·or·else·it·throws·a·conversion·exception.·Similarly,·if·you·try·to·read·a·32-bit·SQL·<code>int</code>·as·a·C++·32-bit·<code>unsigned·int</code>,·that'll·work·fine,·unless·the·value·happens·to·be·negative.·In·such·cases·the·conversion·will·throw·a·<code>conversion_error</code>.</p>	103	<p>So,·if·you've·SELECTed·a·64-bit·integer·from·the·database,·and·you·try·to·convert·it·to·a·C++·<code>short,</code>·one·of·two·things·will·happen:·either·the·number·is·small·enough·to·fit·in·your·<code>short</code>·and·it·just·works,·or·else·it·throws·a·conversion·exception.·Similarly,·if·you·try·to·read·a·32-bit·SQL·<code>int</code>·as·a·C++·32-bit·<code>unsigned·int</code>,·that'll·work·fine,·unless·the·value·happens·to·be·negative.·In·such·cases·the·conversion·will·throw·a·<code>conversion_error</code>.</p>
104	<p>Or,·your·database·table·might·have·a·text·column,·but·a·given·field·may·contain·a·string·that·<em>looks</em>·just·like·a·number.·You·can·convert·that·value·to·an·integer·type·just·fine.·Or·to·a·floating-point·type.·All·that·matters·to·the·conversion·is·the·actual·value,·and·the·type·your·code·specifies.</p>	104	<p>Or,·your·database·table·might·have·a·text·column,·but·a·given·field·may·contain·a·string·that·<em>looks</em>·just·like·a·number.·You·can·convert·that·value·to·an·integer·type·just·fine.·Or·to·a·floating-point·type.·All·that·matters·to·the·conversion·is·the·actual·value,·and·the·type·your·code·specifies.</p>
105	<p>In·some·cases·the·templates·for·these·conversions·can·tell·the·type·from·the·arguments·you·pass·them:</p>	105	<p>In·some·cases·the·templates·for·these·conversions·can·tell·the·type·from·the·arguments·you·pass·them:</p>
106	<div·class="fragment"><div·class="line"><span·class="keyword">auto</span>·x·=·to_string(99);</div>	106	<div·class="fragment"><div·class="line"><span·class="keyword">auto</span>·x·=·to_string(99);</div>
107	</div><!--·fragment·--><p>In·other·cases·you·may·need·to·instantiate·template·explicitly:</p>	107	</div><!--·fragment·--><p>In·other·cases·you·may·need·to·instantiate·template·explicitly:</p>
108	<div·class="fragment"><div·class="line"><span·class="keyword">auto</span>·y·=·from_string<int>(<span·class="stringliteral">"99"</span>);</div>	108	<div·class="fragment"><div·class="line"><span·class="keyword">auto</span>·y·=·from_string<int>(<span·class="stringliteral">"99"</span>);</div>
109	</div><!--·fragment·--><h1><a·class="anchor"·id="autotoc_md9"></a>	109	</div><!--·fragment·--><h1><a·class="anchor"·id="autotoc_md7"></a>
110	Supporting·a·new·type</h1>	110	Supporting·a·new·type</h1>
111	<p>Let's·say·you·have·some·other·SQL·type·which·you·want·to·be·able·to·store·in,·or·retrieve·from,·the·database.·What·would·it·take·to·support·that?</p>	111	<p>Let's·say·you·have·some·other·SQL·type·which·you·want·to·be·able·to·store·in,·or·retrieve·from,·the·database.·What·would·it·take·to·support·that?</p>
112	<p>Sometimes·you·do·not·need·<em>complete</em>·support.·You·might·need·a·conversion·<em>to</em>·a·string·but·not·<em>from</em>·a·string,·for·example.·You·write·out·the·conversion·at·compile·time,·so·don't·be·too·afraid·to·be·incomplete.·If·you·leave·out·one·of·these·steps,·it's·not·going·to·crash·at·run·time·or·mess·up·your·data.·The·worst·that·can·happen·is·that·your·code·won't·build.</p>	112	<p>Sometimes·you·do·not·need·<em>complete</em>·support.·You·might·need·a·conversion·<em>to</em>·a·string·but·not·<em>from</em>·a·string,·for·example.·You·write·out·the·conversion·at·compile·time,·so·don't·be·too·afraid·to·be·incomplete.·If·you·leave·out·one·of·these·steps,·it's·not·going·to·crash·at·run·time·or·mess·up·your·data.·The·worst·that·can·happen·is·that·your·code·won't·build.</p>
113	<p>So·what·do·you·need·for·a·complete·conversion?</p>	113	<p>So·what·do·you·need·for·a·complete·conversion?</p>
114	<p>First·off,·of·course,·you·need·a·C++·type.·It·may·be·your·own,·but·it·doesn't·have·to·be.·It·could·be·a·type·from·a·third-party·library,·or·even·one·from·the·standard·library·that·libpqxx·does·not·yet·support.</p>	114	<p>First·off,·of·course,·you·need·a·C++·type.·It·may·be·your·own,·but·it·doesn't·have·to·be.·It·could·be·a·type·from·a·third-party·library,·or·even·one·from·the·standard·library·that·libpqxx·does·not·yet·support.</p>
115	<p>First·thing·to·do·is·specialise·the·<code><a·class="el"·href="namespacepqxx.html#a03b51dc175989959be170596670dafa4"·title="A·human-readable·name·for·a·type,·used·in·error·messages·and·such.">pqxx::type_name</a></code>·variable·to·give·the·type·a·human-readable·name.·That·allows·libpqxx·error·messages·and·such·to·talk·about·the·type.·If·you·don't·define·a·name,·libpqxx·will·try·to·figure·one·out·with·some·help·from·the·compiler,·but·it·may·not·always·be·easy·to·read.</p>	115	<p>First·thing·to·do·is·specialise·the·<code><a·class="el"·href="namespacepqxx.html#a03b51dc175989959be170596670dafa4"·title="A·human-readable·name·for·a·type,·used·in·error·messages·and·such.">pqxx::type_name</a></code>·variable·to·give·the·type·a·human-readable·name.·That·allows·libpqxx·error·messages·and·such·to·talk·about·the·type.·If·you·don't·define·a·name,·libpqxx·will·try·to·figure·one·out·with·some·help·from·the·compiler,·but·it·may·not·always·be·easy·to·read.</p>
116	<p>Then,·does·your·type·have·a·built-in·null·value?·For·example,·a·<code>char·*</code>·can·be·null·on·the·C++·side.·Or·some·types·are·<em>always</em>·null,·such·as·<code>nullptr</code>.·You·specialise·the·<code><a·class="el"·href="structpqxx_1_1nullness.html"·title="Traits·describing·a·type's·"null·value,"·if·any.">pqxx::nullness</a></code>·template·to·specify·the·details.</p>	116	<p>Then,·does·your·type·have·a·built-in·null·value?·For·example,·a·<code>char·*</code>·can·be·null·on·the·C++·side.·Or·some·types·are·<em>always</em>·null,·such·as·<code>nullptr</code>.·You·specialise·the·<code><a·class="el"·href="structpqxx_1_1nullness.html"·title="Traits·describing·a·type's·"null·value,"·if·any.">pqxx::nullness</a></code>·template·to·specify·the·details.</p>
117	<p>Finally,·you·specialise·the·<code><a·class="el"·href="structpqxx_1_1string__traits.html"·title="Traits·class·for·use·in·string·conversions.">pqxx::string_traits</a></code>·template.·This·is·where·you·define·the·actual·conversions.</p>	117	<p>Finally,·you·specialise·the·<code><a·class="el"·href="structpqxx_1_1string__traits.html"·title="Traits·class·for·use·in·string·conversions.">pqxx::string_traits</a></code>·template.·This·is·where·you·define·the·actual·conversions.</p>
118	<p>Let's·go·through·these·steps·one·by·one.</p>	118	<p>Let's·go·through·these·steps·one·by·one.</p>
119	<h1><a·class="anchor"·id="autotoc_md10"></a>	119	<h1><a·class="anchor"·id="autotoc_md8"></a>
120	Your·type</h1>	120	Your·type</h1>
121	<p>You'll·need·a·type·for·which·the·conversions·are·not·yet·defined,·because·the·C++·type·is·what·determines·the·right·conversion.·One·type,·one·set·of·conversions.</p>	121	<p>You'll·need·a·type·for·which·the·conversions·are·not·yet·defined,·because·the·C++·type·is·what·determines·the·right·conversion.·One·type,·one·set·of·conversions.</p>
122	<p>The·type·doesn't·have·to·be·one·that·you·create.·The·conversion·logic·was·designed·such·that·you·can·build·it·around·any·type.·So·you·can·just·as·easily·build·a·conversion·for·a·type·that's·defined·somewhere·else.·There's·no·need·to·include·any·special·methods·or·other·members·inside·the·type·itself.·That's·also·why·libpqxx·can·convert·built-in·types·like·<code>int</code>.</p>	122	<p>The·type·doesn't·have·to·be·one·that·you·create.·The·conversion·logic·was·designed·such·that·you·can·build·it·around·any·type.·So·you·can·just·as·easily·build·a·conversion·for·a·type·that's·defined·somewhere·else.·There's·no·need·to·include·any·special·methods·or·other·members·inside·the·type·itself.·That's·also·why·libpqxx·can·convert·built-in·types·like·<code>int</code>.</p>
123	<p>By·the·way,·if·the·type·is·an·enum,·you·don't·need·to·do·any·of·this.·Just·invoke·the·preprocessor·macro·<code>PQXX_DECLARE_ENUM_CONVERSION</code>,·from·the·global·namespace·near·the·top·of·your·translation·unit,·and·pass·the·type·as·an·argument.</p>	123	<p>By·the·way,·if·the·type·is·an·enum,·you·don't·need·to·do·any·of·this.·Just·invoke·the·preprocessor·macro·<code>PQXX_DECLARE_ENUM_CONVERSION</code>,·from·the·global·namespace·near·the·top·of·your·translation·unit,·and·pass·the·type·as·an·argument.</p>
124	<p>The·library·also·provides·specialisations·for·<code>std::optional<T></code>,·<code>std::shared_ptr<T></code>,·and·<code>std::unique_ptr<T></code>.·If·you·have·conversions·for·<code>T</code>,·you'll·also·automatically·have·conversions·for·those.</p>	124	<p>The·library·also·provides·specialisations·for·<code>std::optional<T></code>,·<code>std::shared_ptr<T></code>,·and·<code>std::unique_ptr<T></code>.·If·you·have·conversions·for·<code>T</code>,·you'll·also·automatically·have·conversions·for·those.</p>
125	<h1><a·class="anchor"·id="autotoc_md11"></a>	125	<h1><a·class="anchor"·id="autotoc_md9"></a>
126	Specialise·<tt>type_name</tt></h1>	126	Specialise·<tt>type_name</tt></h1>
127	<p>When·errors·happen·during·conversion,·libpqxx·will·compose·error·messages·for·the·user.·Sometimes·these·will·include·the·name·of·the·type·that's·being·converted.</p>	127	<p>When·errors·happen·during·conversion,·libpqxx·will·compose·error·messages·for·the·user.·Sometimes·these·will·include·the·name·of·the·type·that's·being·converted.</p>
128	<p>To·tell·libpqxx·the·name·of·each·type,·there's·a·template·variable·called·<code><a·class="el"·href="namespacepqxx.html#a03b51dc175989959be170596670dafa4"·title="A·human-readable·name·for·a·type,·used·in·error·messages·and·such.">pqxx::type_name</a></code>.·For·any·given·type·<code>T</code>,·it·should·have·a·specialisation·that·provides·that·<code>T</code>'s·human-readable·name:</p>	128	<p>To·tell·libpqxx·the·name·of·each·type,·there's·a·template·variable·called·<code><a·class="el"·href="namespacepqxx.html#a03b51dc175989959be170596670dafa4"·title="A·human-readable·name·for·a·type,·used·in·error·messages·and·such.">pqxx::type_name</a></code>.·For·any·given·type·<code>T</code>,·it·should·have·a·specialisation·that·provides·that·<code>T</code>'s·human-readable·name:</p>
129	<div·class="fragment"><div·class="line"><span·class="comment">//·T·is·your·type.</span></div>	129	<div·class="fragment"><div·class="line"><span·class="comment">//·T·is·your·type.</span></div>
130	<div·class="line"><span·class="keyword">namespace·</span><a·class="code·hl_namespace"·href="namespacepqxx.html">pqxx</a></div>	130	<div·class="line"><span·class="keyword">namespace·</span><a·class="code·hl_namespace"·href="namespacepqxx.html">pqxx</a></div>


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93	··<div·class="headertitle"><div·class="title">Deprecated·List</div></div>	93	··<div·class="headertitle"><div·class="title">Deprecated·List</div></div>
94	</div><!--header-->	94	</div><!--header-->
95	<div·class="contents">	95	<div·class="contents">
96	<div·class="textblock"><dl·class="reflist">	96	<div·class="textblock"><dl·class="reflist">
97	<dt>Class·<a·class="el"·href="classpqxx_1_1basic__fieldstream.html">pqxx::basic_fieldstream<·CHAR,·TRAITS·></a>··</dt>	97	<dt>Class·<a·class="el"·href="classpqxx_1_1basic__fieldstream.html">pqxx::basic_fieldstream<·CHAR,·TRAITS·></a>··</dt>
98	<dd><a·class="anchor"·id="_deprecated000006"></a>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>	98	<dd><a·class="anchor"·id="_deprecated000006"></a>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>
99	<dt>Class·<a·class="el"·href="classpqxx_1_1basic__ilostream.html">pqxx::basic_ilostream<·CHAR,·TRAITS·></a>··</dt>	99	<dt>Class·<a·class="el"·href="classpqxx_1_1basic__ilostream.html">pqxx::basic_ilostream<·CHAR,·TRAITS·></a>··</dt>
100	<dd><a·class="anchor"·id="_deprecated000016"></a>Access·large·objects·directly·using·the·<a·class="el"·href="classpqxx_1_1blob.html">blob</a>·class.·</dd>	100	<dd><a·class="anchor"·id="_deprecated000017"></a>Access·large·objects·directly·using·the·<a·class="el"·href="classpqxx_1_1blob.html">blob</a>·class.·</dd>
101	<dt>Class·<a·class="el"·href="classpqxx_1_1basic__lostream.html">pqxx::basic_lostream<·CHAR,·TRAITS·></a>··</dt>	101	<dt>Class·<a·class="el"·href="classpqxx_1_1basic__lostream.html">pqxx::basic_lostream<·CHAR,·TRAITS·></a>··</dt>
102	<dd><a·class="anchor"·id="_deprecated000018"></a>Access·large·objects·directly·using·the·<a·class="el"·href="classpqxx_1_1blob.html">blob</a>·class.·</dd>	102	<dd><a·class="anchor"·id="_deprecated000019"></a>Access·large·objects·directly·using·the·<a·class="el"·href="classpqxx_1_1blob.html">blob</a>·class.·</dd>
103	<dt>Class·<a·class="el"·href="classpqxx_1_1basic__olostream.html">pqxx::basic_olostream<·CHAR,·TRAITS·></a>··</dt>	103	<dt>Class·<a·class="el"·href="classpqxx_1_1basic__olostream.html">pqxx::basic_olostream<·CHAR,·TRAITS·></a>··</dt>
104	<dd><a·class="anchor"·id="_deprecated000017"></a>Access·large·objects·directly·using·the·<a·class="el"·href="classpqxx_1_1blob.html">blob</a>·class.·</dd>	104	<dd><a·class="anchor"·id="_deprecated000018"></a>Access·large·objects·directly·using·the·<a·class="el"·href="classpqxx_1_1blob.html">blob</a>·class.·</dd>
105	<dt>Class·<a·class="el"·href="group__escaping-functions.html">pqxx::binarystring</a>··</dt>	105	<dt>Class·<a·class="el"·href="group__escaping-functions.html">pqxx::binarystring</a>··</dt>
106	<dd><a·class="anchor"·id="_deprecated000001"></a>Use·<code>bytes</code>·and·<code>bytes_view</code>·for·binary·data.·In·C++20·or·better,·any·<code>contiguous_range</code>·of·<code>std::byte</code>·will·do.·</dd>	106	<dd><a·class="anchor"·id="_deprecated000001"></a>Use·<code>bytes</code>·and·<code>bytes_view</code>·for·binary·data.·In·C++20·or·better,·any·<code>contiguous_range</code>·of·<code>std::byte</code>·will·do.·</dd>
107	<dt>Member·<a·class="el"·href="classpqxx_1_1blob.html#af687083e0ce3884d27e8fcf3f6254a23">pqxx::blob::read</a>··(std::vector<·std::byte,·ALLOC·>·&buf)</dt>	107	<dt>Member·<a·class="el"·href="classpqxx_1_1blob.html#af687083e0ce3884d27e8fcf3f6254a23">pqxx::blob::read</a>··(std::vector<·std::byte,·ALLOC·>·&buf)</dt>
108	<dd><a·class="anchor"·id="_deprecated000002"></a>As·libpqxx·moves·to·C++20·as·its·baseline·language·version,·this·will·take·and·return·<code>std::span<std::byte></code>.·</dd>	108	<dd><a·class="anchor"·id="_deprecated000002"></a>As·libpqxx·moves·to·C++20·as·its·baseline·language·version,·this·will·take·and·return·<code>std::span<std::byte></code>.·</dd>
109	<dt>Member·<a·class="el"·href="classpqxx_1_1connection.html#a59295a47049b03ab949b3781dd60ed42">pqxx::connection::set_variable</a>··(std::string_view·var,·std::string_view·value)·&</dt>	109	<dt>Member·<a·class="el"·href="classpqxx_1_1connection.html#a59295a47049b03ab949b3781dd60ed42">pqxx::connection::set_variable</a>··(std::string_view·var,·std::string_view·value)·&</dt>
110	<dd><a·class="anchor"·id="_deprecated000009"></a>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>	110	<dd><a·class="anchor"·id="_deprecated000009"></a>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>
111	<dt>Member·<a·class="el"·href="namespacepqxx.html#a81df5de3c98b6a4ffe24530f37bb764d">pqxx::connection_base</a>··</dt>	111	<dt>Member·<a·class="el"·href="namespacepqxx.html#a81df5de3c98b6a4ffe24530f37bb764d">pqxx::connection_base</a>··</dt>
112	<dd><a·class="anchor"·id="_deprecated000003"></a>Old·base·class·for·connection.·They·are·now·the·same·class.··</dd>	112	<dd><a·class="anchor"·id="_deprecated000003"></a>Old·base·class·for·connection.·They·are·now·the·same·class.··</dd>
113	<dt>Member·<a·class="el"·href="namespacepqxx.html#a204a7f521845d2fa16035b60eab9ddbb">pqxx::encrypt_password</a>··(zview·user,·zview·password)</dt>
114	<dd><a·class="anchor"·id="_deprecated000005"></a>Use·<a·class="el"·href="classpqxx_1_1connection.html#a0724de6ed0e9b65267967adaa34c4f78"·title="Encrypt·a·password·for·a·given·user.">connection::encrypt_password</a>·instead.··</dd>
115	<dt>Member·<a·class="el"·href="namespacepqxx.html#abb5e089e78f78ecb49a5da2c802113bd">pqxx::encrypt_password</a>··(char·const·user[],·char·const·password[])</dt>	113	<dt>Member·<a·class="el"·href="namespacepqxx.html#abb5e089e78f78ecb49a5da2c802113bd">pqxx::encrypt_password</a>··(char·const·user[],·char·const·password[])</dt>
116	<dd><a·class="anchor"·id="_deprecated000004"></a>Use·<a·class="el"·href="classpqxx_1_1connection.html#a0724de6ed0e9b65267967adaa34c4f78"·title="Encrypt·a·password·for·a·given·user.">connection::encrypt_password</a>·instead.··</dd>	114	<dd><a·class="anchor"·id="_deprecated000004"></a>Use·<a·class="el"·href="classpqxx_1_1connection.html#a0724de6ed0e9b65267967adaa34c4f78"·title="Encrypt·a·password·for·a·given·user.">connection::encrypt_password</a>·instead.··</dd>
		115	<dt>Member·<a·class="el"·href="namespacepqxx.html#a204a7f521845d2fa16035b60eab9ddbb">pqxx::encrypt_password</a>··(zview·user,·zview·password)</dt>
		116	<dd><a·class="anchor"·id="_deprecated000005"></a>Use·<a·class="el"·href="classpqxx_1_1connection.html#a0724de6ed0e9b65267967adaa34c4f78"·title="Encrypt·a·password·for·a·given·user.">connection::encrypt_password</a>·instead.··</dd>
117	<dt>Member·<a·class="el"·href="namespacepqxx.html#ac3b4a1e80160ee2d6fd623ad043e5416">pqxx::fieldstream</a>··</dt>	117	<dt>Member·<a·class="el"·href="namespacepqxx.html#ac3b4a1e80160ee2d6fd623ad043e5416">pqxx::fieldstream</a>··</dt>
118	<dd><a·class="anchor"·id="_deprecated000007"></a>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>	118	<dd><a·class="anchor"·id="_deprecated000007"></a>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>
119	<dt>Member·<a·class="el"·href="namespacepqxx.html#a31fff381823ee2bc5af1f47139b3b48c">pqxx::from_query</a>··</dt>	119	<dt>Member·<a·class="el"·href="namespacepqxx.html#a31fff381823ee2bc5af1f47139b3b48c">pqxx::from_query</a>··</dt>
120	<dd><a·class="anchor"·id="_deprecated000024"></a>Use·<a·class="el"·href="group__transactions.html#aec4d0f102c2c0fab8fa1a48f452abc0f"·title="Execute·a·query,·in·streaming·fashion;·loop·over·the·results·row·by·row.">transaction_base::stream</a>·instead·of·<a·class="el"·href="classpqxx_1_1stream__from.html"·title="Stream·data·from·the·database.">stream_from</a>.··</dd>	120	<dd><a·class="anchor"·id="_deprecated000025"></a>Use·<a·class="el"·href="group__transactions.html#aec4d0f102c2c0fab8fa1a48f452abc0f"·title="Execute·a·query,·in·streaming·fashion;·loop·over·the·results·row·by·row.">transaction_base::stream</a>·instead·of·<a·class="el"·href="classpqxx_1_1stream__from.html"·title="Stream·data·from·the·database.">stream_from</a>.··</dd>
121	<dt>Struct·<a·class="el"·href="namespacepqxx.html">pqxx::from_query_t</a>··</dt>	121	<dt>Struct·<a·class="el"·href="namespacepqxx.html">pqxx::from_query_t</a>··</dt>
122	<dd><a·class="anchor"·id="_deprecated000041"></a>Use·<a·class="el"·href="classpqxx_1_1stream__from.html#a062c20b73f6c9d019bfc35806c432ec0">stream_from::query()</a>·instead.··</dd>	122	<dd><a·class="anchor"·id="_deprecated000041"></a>Use·<a·class="el"·href="classpqxx_1_1stream__from.html#a062c20b73f6c9d019bfc35806c432ec0">stream_from::query()</a>·instead.··</dd>
123	<dt>Member·<a·class="el"·href="namespacepqxx.html#a66648ed503eb162846c41247daa32660">pqxx::from_table</a>··</dt>	123	<dt>Member·<a·class="el"·href="namespacepqxx.html#a66648ed503eb162846c41247daa32660">pqxx::from_table</a>··</dt>
124	<dd><a·class="anchor"·id="_deprecated000023"></a>Use·<a·class="el"·href="group__transactions.html#aec4d0f102c2c0fab8fa1a48f452abc0f">transaction_base::stream</a>·instead·of·<a·class="el"·href="classpqxx_1_1stream__from.html"·title="Stream·data·from·the·database.">stream_from</a>.··</dd>	124	<dd><a·class="anchor"·id="_deprecated000024"></a>Use·<a·class="el"·href="group__transactions.html#aec4d0f102c2c0fab8fa1a48f452abc0f">transaction_base::stream</a>·instead·of·<a·class="el"·href="classpqxx_1_1stream__from.html"·title="Stream·data·from·the·database.">stream_from</a>.··</dd>
125	<dt>Struct·<a·class="el"·href="namespacepqxx.html">pqxx::from_table_t</a>··</dt>	125	<dt>Struct·<a·class="el"·href="namespacepqxx.html">pqxx::from_table_t</a>··</dt>
126	<dd><a·class="anchor"·id="_deprecated000040"></a>Use·<a·class="el"·href="classpqxx_1_1stream__from.html#a8bd03db93560766414f74258202f86fd">stream_from::table()</a>·instead.··</dd>	126	<dd><a·class="anchor"·id="_deprecated000040"></a>Use·<a·class="el"·href="classpqxx_1_1stream__from.html#a8bd03db93560766414f74258202f86fd">stream_from::table()</a>·instead.··</dd>
127	<dt>Class·<a·class="el"·href="classpqxx_1_1internal_1_1dynamic__params.html">pqxx::internal::dynamic_params<·IT,·ACCESSOR·></a>··</dt>	127	<dt>Class·<a·class="el"·href="classpqxx_1_1internal_1_1dynamic__params.html">pqxx::internal::dynamic_params<·IT,·ACCESSOR·></a>··</dt>
128	<dd><a·class="anchor"·id="_deprecated000010"></a>Use·<a·class="el"·href="classpqxx_1_1params.html">params</a>·instead.·</dd>	128	<dd><a·class="anchor"·id="_deprecated000010"></a>Use·<a·class="el"·href="classpqxx_1_1params.html">params</a>·instead.·</dd>


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3	····"accessing-results.html#autotoc_md1":·[0,·0],	3	····"accessing-results.html#autotoc_md0":·[0,·0],
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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·basically·a·function·that·you·can·define·ad·hoc.</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·basically·a·function·that·you·can·define·ad·hoc.</p>
96	<p>If·you·have·an·SQL·statement·that·you're·going·to·execute·many·times·in·quick·succession,·it·may·be·more·efficient·to·prepare·it·once·and·reuse·it.·This·saves·the·database·backend·the·effort·of·parsing·complex·SQL·and·figuring·out·an·efficient·execution·plan.·Another·nice·side·effect·is·that·you·don't·need·to·worry·about·escaping·parameters.·Some·corporate·coding·standards·require·all·SQL·parameters·to·be·passed·in·this·way,·to·reduce·the·risk·of·programmer·mistakes·leaving·room·for·SQL·injections.</p>	96	<p>If·you·have·an·SQL·statement·that·you're·going·to·execute·many·times·in·quick·succession,·it·may·be·more·efficient·to·prepare·it·once·and·reuse·it.·This·saves·the·database·backend·the·effort·of·parsing·complex·SQL·and·figuring·out·an·efficient·execution·plan.·Another·nice·side·effect·is·that·you·don't·need·to·worry·about·escaping·parameters.·Some·corporate·coding·standards·require·all·SQL·parameters·to·be·passed·in·this·way,·to·reduce·the·risk·of·programmer·mistakes·leaving·room·for·SQL·injections.</p>
97	<h1><a·class="anchor"·id="autotoc_md13"></a>	97	<h1><a·class="anchor"·id="autotoc_md20"></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·identifier·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·identifier·and·its·SQL·text.</p>
100	<p>The·identifier·is·the·name·by·which·the·prepared·statement·will·be·known;·it·should·consist·of·ASCII·letters,·digits,·and·underscores·only,·and·start·with·an·ASCII·letter.·The·name·is·case-sensitive.</p>	100	<p>The·identifier·is·the·name·by·which·the·prepared·statement·will·be·known;·it·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>·&c)</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>·&c)</div>
102	<div·class="line">{</div>	102	<div·class="line">{</div>
103	<div·class="line">··c.<a·class="code·hl_function"·href="classpqxx_1_1connection.html#add8ab06057cfd57e509c1e4e1f26e944">prepare</a>(</div>	103	<div·class="line">··c.<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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111	<div·class="fragment"><div·class="line"><a·class="code·hl_class"·href="classpqxx_1_1result.html">pqxx::result</a>·execute_my_statement(<a·class="code·hl_class"·href="group__transactions.html#classpqxx_1_1transaction__base">pqxx::transaction_base</a>·&t)</div>	111	<div·class="fragment"><div·class="line"><a·class="code·hl_class"·href="classpqxx_1_1result.html">pqxx::result</a>·execute_my_statement(<a·class="code·hl_class"·href="group__transactions.html#classpqxx_1_1transaction__base">pqxx::transaction_base</a>·&t)</div>
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#a0ca4a1543e55c3c1e4a2becc51f70e0b">exec_prepared</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#a0ca4a1543e55c3c1e4a2becc51f70e0b">exec_prepared</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_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:73</div></div>	115	<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:73</div></div>
116	<div·class="ttc"·id="agroup__transactions_html_a0ca4a1543e55c3c1e4a2becc51f70e0b"><div·class="ttname"><a·href="group__transactions.html#a0ca4a1543e55c3c1e4a2becc51f70e0b">pqxx::transaction_base::exec_prepared</a></div><div·class="ttdeci">result·exec_prepared(zview·statement,·Args·&&...args)</div><div·class="ttdoc">Execute·a·prepared·statement,·with·optional·arguments.</div><div·class="ttdef"><b>Definition</b>·transaction_base.hxx:948</div></div>	116	<div·class="ttc"·id="agroup__transactions_html_a0ca4a1543e55c3c1e4a2becc51f70e0b"><div·class="ttname"><a·href="group__transactions.html#a0ca4a1543e55c3c1e4a2becc51f70e0b">pqxx::transaction_base::exec_prepared</a></div><div·class="ttdeci">result·exec_prepared(zview·statement,·Args·&&...args)</div><div·class="ttdoc">Execute·a·prepared·statement,·with·optional·arguments.</div><div·class="ttdef"><b>Definition</b>·transaction_base.hxx:948</div></div>
117	<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:150</div></div>	117	<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:150</div></div>
118	</div><!--·fragment·--><h1><a·class="anchor"·id="autotoc_md14"></a>	118	</div><!--·fragment·--><h1><a·class="anchor"·id="autotoc_md21"></a>
119	Parameters</h1>	119	Parameters</h1>
120	<p>Did·I·mention·that·prepared·statements·can·have·parameters?·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>	120	<p>Did·I·mention·that·prepared·statements·can·have·parameters?·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>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>	121	<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	<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>·&c)</div>	122	<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>·&c)</div>
123	<div·class="line">{</div>	123	<div·class="line">{</div>
124	<div·class="line">··<span·class="comment">//·Prepare·a·statement·called·"find"·that·looks·for·employees·with·a</span></div>	124	<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">//·given·name·(parameter·1)·whose·salary·exceeds·a·given·number</span></div>	125	<div·class="line">··<span·class="comment">//·given·name·(parameter·1)·whose·salary·exceeds·a·given·number</span></div>
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130	<div·class="line">}</div>	130	<div·class="line">}</div>
131	</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>	131	</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·class="fragment"><div·class="line"><a·class="code·hl_class"·href="classpqxx_1_1result.html">pqxx::result</a>·execute_find(</div>	132	<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="line">··<a·class="code·hl_class"·href="group__transactions.html#classpqxx_1_1transaction__base">pqxx::transaction_base</a>·&t,·std::string·name,·<span·class="keywordtype">int</span>·min_salary)</div>	133	<div·class="line">··<a·class="code·hl_class"·href="group__transactions.html#classpqxx_1_1transaction__base">pqxx::transaction_base</a>·&t,·std::string·name,·<span·class="keywordtype">int</span>·min_salary)</div>
134	<div·class="line">{</div>	134	<div·class="line">{</div>
135	<div·class="line">··<span·class="keywordflow">return</span>·t.<a·class="code·hl_function"·href="group__transactions.html#a0ca4a1543e55c3c1e4a2becc51f70e0b">exec_prepared</a>(<span·class="stringliteral">"find"</span>,·name,·min_salary);</div>	135	<div·class="line">··<span·class="keywordflow">return</span>·t.<a·class="code·hl_function"·href="group__transactions.html#a0ca4a1543e55c3c1e4a2becc51f70e0b">exec_prepared</a>(<span·class="stringliteral">"find"</span>,·name,·min_salary);</div>
136	<div·class="line">}</div>	136	<div·class="line">}</div>
137	</div><!--·fragment·--><h1><a·class="anchor"·id="autotoc_md15"></a>	137	</div><!--·fragment·--><h1><a·class="anchor"·id="autotoc_md22"></a>
138	A·special·prepared·statement</h1>	138	A·special·prepared·statement</h1>
139	<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>	139	<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	<h1><a·class="anchor"·id="autotoc_md16"></a>	140	<h1><a·class="anchor"·id="autotoc_md23"></a>
141	Performance·note</h1>	141	Performance·note</h1>
142	<p>Don't·assume·that·using·prepared·statements·will·speed·up·your·application.·There·are·cases·where·prepared·statements·are·actually·slower·than·plain·SQL.</p>	142	<p>Don't·assume·that·using·prepared·statements·will·speed·up·your·application.·There·are·cases·where·prepared·statements·are·actually·slower·than·plain·SQL.</p>
143	<p>The·reason·is·that·the·backend·can·often·produce·a·better·execution·plan·when·it·knows·the·statement's·actual·parameter·values.</p>	143	<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>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>	144	<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	<h1><a·class="anchor"·id="autotoc_md18"></a>	145	<h1><a·class="anchor"·id="autotoc_md24"></a>
146	Zero·bytes</h1>	146	Zero·bytes</h1>
147	<dl·class="section·warning"><dt>Warning</dt><dd>Beware·of·"nul"·bytes!</dd></dl>	147	<dl·class="section·warning"><dt>Warning</dt><dd>Beware·of·"nul"·bytes!</dd></dl>
148	<p>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>	148	<p>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>
149	<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>	149	<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>
150	<p>In·libpqxx,·you·represent·binary·data·as·a·range·of·<code>std::byte</code>.·They·must·be·contiguous·in·memory,·so·that·libpqxx·can·pass·pointers·to·the·underlying·C·library.·So·you·might·use·<code><a·class="el"·href="namespacepqxx.html#ac5e2f3e80ccc3a5f58bab7d699c9be05"·title="Type·alias·for·a·container·containing·bytes.">pqxx::bytes</a></code>,·or·<code><a·class="el"·href="namespacepqxx.html#adf98e8b2ed585c586f9575928421e07d"·title="Type·alias·for·a·view·of·bytes.">pqxx::bytes_view</a></code>,·or·<code>std::vector<std::byte></code>.·</p>	150	<p>In·libpqxx,·you·represent·binary·data·as·a·range·of·<code>std::byte</code>.·They·must·be·contiguous·in·memory,·so·that·libpqxx·can·pass·pointers·to·the·underlying·C·library.·So·you·might·use·<code><a·class="el"·href="namespacepqxx.html#ac5e2f3e80ccc3a5f58bab7d699c9be05"·title="Type·alias·for·a·container·containing·bytes.">pqxx::bytes</a></code>,·or·<code><a·class="el"·href="namespacepqxx.html#adf98e8b2ed585c586f9575928421e07d"·title="Type·alias·for·a·view·of·bytes.">pqxx::bytes_view</a></code>,·or·<code>std::vector<std::byte></code>.·</p>
151	</div></div><!--·contents·-->	151	</div></div><!--·contents·-->
152	</div><!--·PageDoc·-->	152	</div><!--·PageDoc·-->


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