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Yasuhiro KIMURA
167 lines
5.7 KiB
HTML
167 lines
5.7 KiB
HTML
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
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<title>Db::get_partition_callback()</title>
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<link rel="stylesheet" href="apiReference.css" type="text/css" />
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<meta name="generator" content="DocBook XSL Stylesheets V1.73.2" />
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<link rel="start" href="index.html" title="Berkeley DB C++ API Reference" />
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<link rel="up" href="db.html" title="Chapter 2. The Db Handle" />
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<link rel="prev" href="dbget_open_flags.html" title="Db::get_open_flags()" />
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<body>
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<p>Library Version 18.1.40</p>
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<table width="100%" summary="Navigation header">
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<tr>
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<th colspan="3" align="center">
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<span xmlns="http://www.w3.org/1999/xhtml">Db::get_partition_callback()</span>
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</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="dbget_open_flags.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 2.
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The Db Handle
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</th>
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<td width="20%" align="right"> <a accesskey="n" href="dbget_partition_dirs.html">Next</a></td>
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</tr>
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<hr />
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</div>
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<div class="sect1" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h2 class="title" style="clear: both"><a id="dbget_partition_callback"></a>
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<span>Db::get_partition_callback()</span>
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</h2>
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</div>
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</div>
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</div>
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<pre class="programlisting">#include <db_cxx.h>
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int
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Db::get_partition_callback(u_int32_t *partsp,
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u_int32_t (**callback_fcn) (DB *dbp, DBT *key);</pre>
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<p>
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The <code class="methodname">Db::get_partition_callback()</code> method
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returns the database partitioning callback as set by the
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<a class="xref" href="dbset_partition.html" title="Db::set_partition()">
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<span>Db::set_partition()</span>
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</a>
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method.
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</p>
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<p>
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The <code class="methodname">Db::get_partition_callback()</code> method
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may be called at any time during the life of the application.
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</p>
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<p>
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The <code class="methodname">Db::get_partition_callback()</code> <span>
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<span>
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method either returns a non-zero error value or throws an
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exception that encapsulates a non-zero error value on
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failure, and returns 0 on success.
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</span>
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</span>
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</p>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h3 class="title"><a id="idm139755633131936"></a>Parameters</h3>
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</div>
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</div>
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</div>
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<div class="sect3" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h4 class="title"><a id="idm139755633127040"></a>partsp</h4>
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</div>
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</div>
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</div>
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<p>
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The <span class="bold"><strong>partsp</strong></span>
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parameter returns the number of partitions used by the
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database.
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</p>
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</div>
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<div class="sect3" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h4 class="title"><a id="idm139755633528960"></a>callback_fcn</h4>
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</div>
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</div>
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</div>
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<p>
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The <span class="bold"><strong>callback_fcn</strong></span>
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parameter returns the partitioning callback.
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</p>
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</div>
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</div>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h3 class="title"><a id="idm139755632070672"></a>Class</h3>
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</div>
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</div>
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</div>
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<p>
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<a class="link" href="db.html" title="Chapter 2. The Db Handle">Db</a>
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</p>
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</div>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h3 class="title"><a id="idm139755633144112"></a>See Also</h3>
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</div>
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</div>
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</div>
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<p>
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<a class="xref" href="db.html#dblist" title="Database and Related Methods">Database and Related Methods</a>,
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<a class="xref" href="dbset_partition.html" title="Db::set_partition()">
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<span>Db::set_partition()</span>
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</a>
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</p>
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</div>
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</div>
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<div class="navfooter">
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<hr />
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<table width="100%" summary="Navigation footer">
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<tr>
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<td width="40%" align="left"><a accesskey="p" href="dbget_open_flags.html">Prev</a> </td>
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<td width="20%" align="center">
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<a accesskey="u" href="db.html">Up</a>
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</td>
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<td width="40%" align="right"> <a accesskey="n" href="dbget_partition_dirs.html">Next</a></td>
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</tr>
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<tr>
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<td width="40%" align="left" valign="top">
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<span>Db::get_open_flags()</span>
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</td>
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<td width="20%" align="center">
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<a accesskey="h" href="index.html">Home</a>
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</td>
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<td width="40%" align="right" valign="top">
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<span>Db::get_partition_dirs()</span>
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</td>
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</tr>
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</table>
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</body>
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