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Yasuhiro KIMURA
281 lines
10 KiB
HTML
281 lines
10 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>DbEnv::set_tmp_dir()</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="env.html" title="Chapter 5. The DbEnv Handle" />
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<link rel="prev" href="envset_timeout.html" title="DbEnv::set_timeout()" />
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<link rel="next" href="envset_verbose.html" title="DbEnv::set_verbose()" />
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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">DbEnv::set_tmp_dir()</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="envset_timeout.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 5.
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The DbEnv Handle
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</th>
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<td width="20%" align="right"> <a accesskey="n" href="envset_verbose.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="envset_tmp_dir"></a>
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<span>DbEnv::set_tmp_dir()</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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DbEnv::set_tmp_dir(const char *dir); </pre>
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<p>
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Specify the path of a directory to be used as the location of
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temporary files. The files created to back in-memory access method
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databases will be created relative to this path. These temporary
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files can be quite large, depending on the size of the database.
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</p>
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<p>
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If no directories are specified, the following alternatives are
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checked in the specified order. The first existing directory path is
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used for all temporary files.
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</p>
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<div class="orderedlist">
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<ol type="1">
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<li>
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<p>
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The value of the environment variable
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<span class="bold"><strong>TMPDIR</strong></span>.
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</p>
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</li>
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<li>
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<p>
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The value of the environment variable
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<span class="bold"><strong>TEMP</strong></span>.
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</p>
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</li>
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<li>
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<p>
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The value of the environment variable
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<span class="bold"><strong>TMP</strong></span>.
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</p>
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</li>
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<li>
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<p>
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The value of the environment variable
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<span class="bold"><strong>TempFolder</strong></span>.
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</p>
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</li>
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<li>
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<p>
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The value returned by the
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<span class="bold"><strong>GetTempPath</strong></span> interface.
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</p>
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</li>
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<li>
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<p>
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The directory <span class="bold"><strong>/var/tmp</strong></span>.
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</p>
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</li>
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<li>
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<p>
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The directory <span class="bold"><strong>/usr/tmp</strong></span>.
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</p>
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</li>
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<li>
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<p>
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The directory <span class="bold"><strong>/temp</strong></span>.
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</p>
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</li>
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<li>
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<p>
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The directory <span class="bold"><strong>/tmp</strong></span>.
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</p>
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</li>
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<li>
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<p>
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The directory <span class="bold"><strong>C:/temp</strong></span>.
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</p>
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</li>
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<li>
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<p>
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The directory <span class="bold"><strong>C:/tmp</strong></span>.
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</p>
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</li>
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</ol>
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</div>
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<div class="note" style="margin-left: 0.5in; margin-right: 0.5in;">
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<h3 class="title">Note</h3>
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<p>
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Environment variables are only checked if one of the
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<a class="link" href="envopen.html#envopen_DB_USE_ENVIRON">DB_USE_ENVIRON</a> or
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<a class="link" href="envopen.html#envopen_DB_USE_ENVIRON_ROOT">DB_USE_ENVIRON_ROOT</a>
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flags were specified.
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</p>
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</div>
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<div class="note" style="margin-left: 0.5in; margin-right: 0.5in;">
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<h3 class="title">Note</h3>
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<p>
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The GetTempPath interface is only checked on Win/32 platforms.
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</p>
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</div>
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<p>
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The database environment's temporary file directory may also be
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configured using the environment's <a href="../../programmer_reference/env_db_config.html#env_db_config.DB_CONFIG" class="olink">DB_CONFIG</a> file. The syntax
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of the entry in that file is a single line with the string
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"set_tmp_dir", one or more whitespace characters, and the
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directory name. Because the <a href="../../programmer_reference/env_db_config.html#env_db_config.DB_CONFIG" class="olink">DB_CONFIG</a> file is read when the
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database environment is opened, it will silently overrule
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configuration done before that time.
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</p>
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<p>
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The <code class="methodname">DbEnv::set_tmp_dir()</code> method configures
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operations performed using the specified
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<a class="link" href="env.html" title="Chapter 5. The DbEnv Handle">DbEnv</a> handle, not all operations
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performed on the underlying database environment.
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</p>
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<p>
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The <code class="methodname">DbEnv::set_tmp_dir()</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="idm139755614320288"></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="idm139755614372304"></a>dir</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>dir</strong></span> parameter is the
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directory to be used to store temporary files. This
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directory must currently exist at environment open time.
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</p>
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<p>
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When using a Unicode build on Windows (the default), the
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this argument will be interpreted as a UTF-8 string, which
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is equivalent to ASCII for Latin characters.
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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="idm139755614438992"></a>Errors</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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The <code class="methodname">DbEnv::set_tmp_dir()</code> <span>
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<span>
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method may fail and throw a <a class="link" href="dbexception.html" title="Chapter 6. The DbException Class">DbException</a>
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exception, encapsulating one of the following non-zero errors, or return one
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of the following non-zero errors:
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</span>
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</span>
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</p>
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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="idm139755614304256"></a>EINVAL</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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If the method was called after <a class="xref" href="envopen.html" title="DbEnv::open()">
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<span>DbEnv::open()</span>
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</a>
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was called; or if an invalid flag value or parameter was specified.
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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="idm139755614301696"></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="env.html" title="Chapter 5. The DbEnv Handle">DbEnv</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="idm139755614330048"></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="env.html#envlist" title="Database Environments and Related Methods">Database Environments 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="envset_timeout.html">Prev</a> </td>
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||
<td width="20%" align="center">
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<a accesskey="u" href="env.html">Up</a>
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||
</td>
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||
<td width="40%" align="right"> <a accesskey="n" href="envset_verbose.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>DbEnv::set_timeout()</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>DbEnv::set_verbose()</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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