mirror of
https://github.com/yasuhirokimura/db18
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Yasuhiro KIMURA
200 lines
7.1 KiB
HTML
200 lines
7.1 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_ENV->set_ext_file_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="blob.html" title="Chapter 13. External Files" />
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<link rel="prev" href="envget_blob_threshold.html" title="DB_ENV->get_ext_file_threshold()" />
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<link rel="next" href="envset_blob_threshold.html" title="DB_ENV->set_ext_file_threshold()" />
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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_ENV->set_ext_file_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="envget_blob_threshold.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 13.
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External Files
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</th>
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<td width="20%" align="right"> <a accesskey="n" href="envset_blob_threshold.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_blob_dir"></a>
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<span>DB_ENV->set_ext_file_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.h>
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int
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DB_ENV->set_ext_file_dir(DB_ENV *dbenv, const char *dir); </pre>
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<p>
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The <code class="methodname">DB_ENV->set_ext_file_dir()</code> method sets the
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directory where external file data is stored. Use this method when the
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database is opened within an encompassing environment. If an
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environment is not in use, use <a class="xref" href="set_blob_dir.html" title="DB->set_ext_file_dir()">
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<span>DB->set_ext_file_dir()</span>
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</a> instead.
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</p>
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<p>
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By default, if this method is not called then external file data is placed
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in a subdirectory within the DB's environment.
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</p>
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<p>
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Once this method has been used, you can call <a class="xref" href="envget_blob_dir.html" title="DB_ENV->get_ext_file_dir()">
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<span>DB_ENV->get_ext_file_dir()</span>
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</a> to
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identify the current storage location used for external file data.
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</p>
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<p>
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This method configures operations performed using the specified
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<a class="link" href="env.html" title="Chapter 5. The DB_ENV Handle">DB_ENV</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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This method may not be called after <a class="xref" href="envopen.html" title="DB_ENV->open()">
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<span>DB_ENV->open()</span>
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</a> is called.
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</p>
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<p>
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Unless otherwise specified, the
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<code class="methodname">DB_ENV->set_ext_file_dir()</code> <span>
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<span>
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method returns a non-zero error value on failure and 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="idm139753795373824"></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="idm139753795373504"></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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Provides the name of the directory where external file data is to
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be stored. If an absolute path is not provided, then the
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directory identified here is relative to the environment's
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home directory.
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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="idm139753795371328"></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">DB_ENV->set_ext_file_dir()</code> <span>
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<span>
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method may fail and return one 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="idm139753795385440"></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="dbopen.html" title="DB->open()">
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<span>DB->open()</span>
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</a> was called; or if
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an invalid 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="idm139753795361248"></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 DB_ENV Handle">DB_ENV</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="idm139753795358272"></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="blob.html#bloblist" title="External Files and Related Methods">External Files 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="envget_blob_threshold.html">Prev</a> </td>
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<td width="20%" align="center">
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<a accesskey="u" href="blob.html">Up</a>
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</td>
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<td width="40%" align="right"> <a accesskey="n" href="envset_blob_threshold.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_ENV->get_ext_file_threshold()</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_ENV->set_ext_file_threshold()</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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