mirror of
https://github.com/yasuhirokimura/db18
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Yasuhiro KIMURA
163 lines
6.0 KiB
HTML
163 lines
6.0 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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<html xmlns="http://www.w3.org/1999/xhtml">
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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->set_msgpfx()</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="dbset_msgfile.html" title="DB->set_msgfile()" />
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<link rel="next" href="dbset_pagesize.html" title="DB->set_pagesize()" />
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</head>
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<body>
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<div xmlns="" class="navheader">
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<div class="libver">
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<p>Library Version 18.1.40</p>
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</div>
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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->set_msgpfx()</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="dbset_msgfile.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="dbset_pagesize.html">Next</a></td>
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</tr>
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</table>
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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="dbset_msgpfx"></a>
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<span>DB->set_msgpfx()</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.h>
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void
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DB->set_msgpfx(DB *db, const char *msgpfx); </pre>
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<p>
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Set the prefix string that appears before informational messages
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issued by Berkeley DB. The length of this string can be no longer
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than 200.
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</p>
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<p>
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The <code class="methodname">DB->set_msgpfx()</code> and
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<a class="xref" href="envset_msgpfx.html" title="DB_ENV->set_msgpfx()">
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<span>DB_ENV->set_msgpfx()</span>
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</a>
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methods do not copy the memory to which the <span class="bold"><strong>msgpfx</strong></span> parameter refers; rather, they maintain
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a reference to it. Although this allows applications to modify the
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informational message prefix at any time (without repeatedly calling the
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interfaces), it means the memory must be maintained until the handle
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is closed.
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</p>
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<p>
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For <a class="link" href="db.html" title="Chapter 2. The DB Handle">DB</a> handles opened
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inside of Berkeley DB environments, calling the <code class="methodname">DB->set_msgpfx()</code>
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method affects the entire environment and is equivalent to calling the
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<a class="xref" href="envset_msgpfx.html" title="DB_ENV->set_msgpfx()">
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<span>DB_ENV->set_msgpfx()</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->set_msgpfx()</code> method configures
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operations performed using the specified
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<a class="link" href="db.html" title="Chapter 2. The DB Handle">DB</a> handle, not all operations
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performed on the underlying database.
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</p>
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<p>
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The <code class="methodname">DB->set_msgpfx()</code> method may be
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called at any time during the life of the application.
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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="idm139753804412432"></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="idm139753804412048"></a>msgpfx</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>msgpfx</strong></span> parameter is
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the application-specified informational prefix for
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additional informational messages.
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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="idm139753804452640"></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="idm139753804434288"></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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</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="dbset_msgfile.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="dbset_pagesize.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->set_msgfile()</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->set_pagesize()</span>
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</td>
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</tr>
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</table>
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</div>
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</body>
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</html>
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