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200 lines
8.5 KiB
HTML
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<?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::add_data_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="dbgetenv.html" title="Db::get_env()" />
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<link rel="next" href="envclose.html" title="DbEnv::close()" />
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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 11.2.5.2</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">DbEnv::add_data_dir()</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="dbgetenv.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="envclose.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="envadd_data_dir"></a>DbEnv::add_data_dir()</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::add_data_dir(const char *dir); </pre>
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<p>
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Add the path of a directory to be used as the location of the access
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method database files. Paths specified to the
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<a class="xref" href="dbopen.html" title="Db::open()">Db::open()</a> function will be
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searched relative to this path. Paths set using this method are
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additive, and specifying more than one will result in each specified
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directory being searched for database files.
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</p>
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<p>
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If no database directories are specified, database files must be named
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either by absolute paths or relative to the environment home
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directory. See
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<a href="../../programmer_reference/env_naming.html" class="olink">Berkeley DB File Naming</a>
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for more information.
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</p>
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<p>
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The database environment's data directories may also be configured
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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 of the entry
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in that file is a single line with the string "add_data_dir", one
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or more whitespace characters, and the directory name.
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Note that if you use this method for your application, and you also want to use the
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<a class="xref" href="db_recover.html" title="db_recover">db_recover</a>,
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<a class="xref" href="db_printlog.html" title="db_printlog">db_printlog</a>,
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<a class="xref" href="db_archive.html" title="db_archive">db_archive</a>, or
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<a class="xref" href="db_log_verify.html" title="db_log_verify">db_log_verify</a>
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utilities, then you should set create a <a href="../../programmer_reference/env_db_config.html#env_db_config.DB_CONFIG" class="olink">DB_CONFIG</a> file and set
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the "add_data_dir" parameter in it.
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</p>
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<p>
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The <code class="methodname">DbEnv::add_data_dir()</code> method configures operations performed
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using the specified <a class="link" href="env.html" title="Chapter 5. The DbEnv Handle">DbEnv</a>
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handle, not all operations 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::add_data_dir()</code> method may not be called after the
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<a class="xref" href="envopen.html" title="DbEnv::open()">DbEnv::open()</a> method is called.
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If the database environment already exists when
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<a class="xref" href="envopen.html" title="DbEnv::open()">DbEnv::open()</a> is called, the
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information specified to <code class="methodname">DbEnv::add_data_dir()</code> must be consistent
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with the existing environment or corruption can occur.
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</p>
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<p>
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The <code class="methodname">DbEnv::add_data_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="id3611722"></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="id3611285"></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 a directory to
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be used as a location for database files.
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</p>
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<p>
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When using a Unicode build on Windows (the default), this argument will be interpreted
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as a UTF-8 string, which 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="id3611793"></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::add_data_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="id3612028"></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()">DbEnv::open()</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="id3612050"></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="id3611754"></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="dbgetenv.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="envclose.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">Db::get_env() </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"> DbEnv::close()</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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