1<?xml version="1.0" encoding="UTF-8" standalone="no"?> 2<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 3<html xmlns="http://www.w3.org/1999/xhtml"> 4 <head> 5 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> 6 <title>DB->get_partition_callback()</title> 7 <link rel="stylesheet" href="apiReference.css" type="text/css" /> 8 <meta name="generator" content="DocBook XSL Stylesheets V1.73.2" /> 9 <link rel="start" href="index.html" title="Berkeley DB C API Reference" /> 10 <link rel="up" href="db.html" title="Chapter��2.�� The DB Handle" /> 11 <link rel="prev" href="dbget_open_flags.html" title="DB->get_open_flags()" /> 12 <link rel="next" href="dbget_partition_dirs.html" title="DB->get_partition_dirs()" /> 13 </head> 14 <body> 15 <div class="navheader"> 16 <table width="100%" summary="Navigation header"> 17 <tr> 18 <th colspan="3" align="center">DB->get_partition_callback()</th> 19 </tr> 20 <tr> 21 <td width="20%" align="left"><a accesskey="p" href="dbget_open_flags.html">Prev</a>��</td> 22 <th width="60%" align="center">Chapter��2.�� 23 The DB Handle 24 </th> 25 <td width="20%" align="right">��<a accesskey="n" href="dbget_partition_dirs.html">Next</a></td> 26 </tr> 27 </table> 28 <hr /> 29 </div> 30 <div class="sect1" lang="en" xml:lang="en"> 31 <div class="titlepage"> 32 <div> 33 <div> 34 <h2 class="title" style="clear: both"><a id="dbget_partition_callback"></a>DB->get_partition_callback()</h2> 35 </div> 36 </div> 37 </div> 38 <pre class="programlisting">#include <db.h> 39 40int 41DB->get_partition_callback(DB *db, u_int32_t *partsp, 42 u_int32_t (**callback_fcn) (DB *dbp, DBT *key); </pre> 43 <p> 44 The <code class="methodname">DB->get_partition_callback()</code> method returns the partitioning information as 45 set by the <a class="xref" href="dbset_partition.html" title="DB->set_partition()">DB->set_partition()</a> method. 46 </p> 47 <p> 48 The <code class="methodname">DB->get_partition_callback()</code> method may be called at any time during the life 49 of the application. 50 </p> 51 <p> 52 The <code class="methodname">DB->get_partition_callback()</code> <span> 53 <span> 54 method returns a non-zero error value on failure and 0 on success. 55 </span> 56 57 </span> 58 </p> 59 <div class="sect2" lang="en" xml:lang="en"> 60 <div class="titlepage"> 61 <div> 62 <div> 63 <h3 class="title"><a id="id1637153"></a>Parameters</h3> 64 </div> 65 </div> 66 </div> 67 <div class="sect3" lang="en" xml:lang="en"> 68 <div class="titlepage"> 69 <div> 70 <div> 71 <h4 class="title"><a id="id1637207"></a>partsp</h4> 72 </div> 73 </div> 74 </div> 75 <p> 76 The 77 <code class="methodname">DB->get_partition_callback()</code> 78 method returns number of partitions in the 79 <span class="bold"><strong>partsp</strong></span> 80 parameter. 81 </p> 82 </div> 83 <div class="sect3" lang="en" xml:lang="en"> 84 <div class="titlepage"> 85 <div> 86 <div> 87 <h4 class="title"><a id="id1637438"></a>callback_fcn</h4> 88 </div> 89 </div> 90 </div> 91 <p> 92 The <span class="bold"><strong>callback_fcn</strong></span> parameter will be set to the partitioning function. 93 </p> 94 </div> 95 </div> 96 <div class="sect2" lang="en" xml:lang="en"> 97 <div class="titlepage"> 98 <div> 99 <div> 100 <h3 class="title"><a id="id1637442"></a>Class</h3> 101 </div> 102 </div> 103 </div> 104 <p> 105 <a class="link" href="db.html" title="Chapter��2.�� The DB Handle">DB</a> 106 </p> 107 </div> 108 <div class="sect2" lang="en" xml:lang="en"> 109 <div class="titlepage"> 110 <div> 111 <div> 112 <h3 class="title"><a id="id1637439"></a>See Also</h3> 113 </div> 114 </div> 115 </div> 116 <p> 117 <a class="xref" href="db.html#dblist" title="Database and Related Methods">Database and Related Methods</a>, 118 <a class="xref" href="dbset_partition.html" title="DB->set_partition()">DB->set_partition()</a> 119 </p> 120 </div> 121 </div> 122 <div class="navfooter"> 123 <hr /> 124 <table width="100%" summary="Navigation footer"> 125 <tr> 126 <td width="40%" align="left"><a accesskey="p" href="dbget_open_flags.html">Prev</a>��</td> 127 <td width="20%" align="center"> 128 <a accesskey="u" href="db.html">Up</a> 129 </td> 130 <td width="40%" align="right">��<a accesskey="n" href="dbget_partition_dirs.html">Next</a></td> 131 </tr> 132 <tr> 133 <td width="40%" align="left" valign="top">DB->get_open_flags()��</td> 134 <td width="20%" align="center"> 135 <a accesskey="h" href="index.html">Home</a> 136 </td> 137 <td width="40%" align="right" valign="top">��DB->get_partition_dirs()</td> 138 </tr> 139 </table> 140 </div> 141 </body> 142</html> 143