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_q_extentsize()</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_priority.html" title="Db::get_priority()" /> 12 <link rel="next" href="dbget_re_delim.html" title="Db::get_re_delim()" /> 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_q_extentsize()</th> 19 </tr> 20 <tr> 21 <td width="20%" align="left"><a accesskey="p" href="dbget_priority.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_re_delim.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_q_extentsize"></a>Db::get_q_extentsize()</h2> 35 </div> 36 </div> 37 </div> 38 <pre class="programlisting">#include <db_cxx.h> 39 40int 41Db::get_q_extentsize(u_int32_t *extentsizep);</pre> 42 <p> 43 The <code class="methodname">Db::get_q_extentsize()</code> method returns the number of pages in an 44 extent. This value is used only for Queue databases and is set using the 45 <a class="xref" href="dbset_q_extentsize.html" title="Db::set_q_extentsize()">Db::set_q_extentsize()</a> 46 method. 47 </p> 48 <p> 49 The <code class="methodname">Db::get_q_extentsize()</code> method may be 50 called only after the database has been opened. 51 </p> 52 <p> 53 The <code class="methodname">Db::get_q_extentsize()</code> <span> 54 55 <span> 56 method either returns a non-zero error value or throws an 57 exception that encapsulates a non-zero error value on 58 failure, and returns 0 on success. 59 </span> 60 </span> 61 </p> 62 <div class="sect2" lang="en" xml:lang="en"> 63 <div class="titlepage"> 64 <div> 65 <div> 66 <h3 class="title"><a id="id1637682"></a>Parameters</h3> 67 </div> 68 </div> 69 </div> 70 <div class="sect3" lang="en" xml:lang="en"> 71 <div class="titlepage"> 72 <div> 73 <div> 74 <h4 class="title"><a id="id1637784"></a>extentsizep</h4> 75 </div> 76 </div> 77 </div> 78 <p> 79 The <code class="methodname">Db::get_q_extentsize()</code> method returns the number of pages in an 80 extent in <span class="bold"><strong>extentsizep</strong></span>. If used on a handle that has not yet been opened, 81 <code class="literal">0</code> is returned. 82 </p> 83 </div> 84 </div> 85 <div class="sect2" lang="en" xml:lang="en"> 86 <div class="titlepage"> 87 <div> 88 <div> 89 <h3 class="title"><a id="id1637684"></a>Class</h3> 90 </div> 91 </div> 92 </div> 93 <p> 94 <a class="link" href="db.html" title="Chapter 2. The Db Handle">Db</a> 95 </p> 96 </div> 97 <div class="sect2" lang="en" xml:lang="en"> 98 <div class="titlepage"> 99 <div> 100 <div> 101 <h3 class="title"><a id="id1638065"></a>See Also</h3> 102 </div> 103 </div> 104 </div> 105 <p> 106 <a class="xref" href="db.html#dblist" title="Database and Related Methods">Database and Related Methods</a>, 107 <a class="xref" href="dbset_q_extentsize.html" title="Db::set_q_extentsize()">Db::set_q_extentsize()</a> 108 </p> 109 </div> 110 </div> 111 <div class="navfooter"> 112 <hr /> 113 <table width="100%" summary="Navigation footer"> 114 <tr> 115 <td width="40%" align="left"><a accesskey="p" href="dbget_priority.html">Prev</a> </td> 116 <td width="20%" align="center"> 117 <a accesskey="u" href="db.html">Up</a> 118 </td> 119 <td width="40%" align="right"> <a accesskey="n" href="dbget_re_delim.html">Next</a></td> 120 </tr> 121 <tr> 122 <td width="40%" align="left" valign="top">Db::get_priority() </td> 123 <td width="20%" align="center"> 124 <a accesskey="h" href="index.html">Home</a> 125 </td> 126 <td width="40%" align="right" valign="top"> Db::get_re_delim()</td> 127 </tr> 128 </table> 129 </div> 130 </body> 131</html> 132