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9.7 KiB
HTML
245 lines
9.7 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>DB->remove()</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="dbput.html" title="DB->put()" />
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<link rel="next" href="dbrename.html" title="DB->rename()" />
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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">DB->remove()</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="dbput.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="dbrename.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="dbremove"></a>DB->remove()</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->remove(DB *db,
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const char *file, const char *database, u_int32_t flags); </pre>
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<p>
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The <code class="methodname">DB->remove()</code> method removes the database specified by the
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<span class="bold"><strong>file</strong></span> and <span class="bold"><strong>database</strong></span> parameters. If no <span class="bold"><strong>database</strong></span> is specified, the underlying file
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represented by <span class="bold"><strong>file</strong></span> is removed,
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incidentally removing all of the databases it contained.
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</p>
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<p>
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Applications should never remove databases with open
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<a class="link" href="db.html" title="Chapter 2. The DB Handle">DB</a> handles, or in the case of
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removing a file, when any database in the file has an open handle.
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For example, some architectures do not permit the removal of files
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with open system handles. On these architectures, attempts to remove
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databases currently in use by any thread of control in the system may
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fail.
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</p>
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<p>
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The <code class="methodname">DB->remove()</code> method should not be called if the remove is
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intended to be transactionally safe; the
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<a class="xref" href="envdbremove.html" title="DB_ENV->dbremove()">DB_ENV->dbremove()</a> method
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should be used instead.
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</p>
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<p>
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The <code class="methodname">DB->remove()</code> method may not be called after calling the
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<a class="xref" href="dbopen.html" title="DB->open()">DB->open()</a> method on any
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<a class="link" href="db.html" title="Chapter 2. The DB Handle">DB</a> handle. If the
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<a class="xref" href="dbopen.html" title="DB->open()">DB->open()</a> method has already
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been called on a <a class="link" href="db.html" title="Chapter 2. The DB Handle">DB</a>
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handle, close the existing handle and create a new one before calling
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<code class="methodname">DB->remove.
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()</code> </p>
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<p>
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The <a class="link" href="db.html" title="Chapter 2. The DB Handle">DB</a> handle may not be
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accessed again after <code class="methodname">DB->remove()</code> is called, regardless of its
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return.
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</p>
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<p>
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The <code class="methodname">DB->remove()</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="id3863792"></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="id3863782"></a>file</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>file</strong></span> parameter is the physical
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file which contains the database(s) to be removed.
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</p>
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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="id3863186"></a>database</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>database</strong></span> parameter is the
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database to be removed.
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</p>
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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="id3863549"></a>flags</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>flags</strong></span> parameter is currently unused, and must
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be set to 0.
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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="id3863876"></a>Environment Variables</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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If the database was opened within a database environment, the
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environment variable <code class="literal">DB_HOME</code> may be used as the path of the
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database environment home.
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</p>
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<p>
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<code class="methodname">DB->remove()</code> is affected by any database directory specified using the
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<a class="xref" href="envset_data_dir.html" title="DB_ENV->set_data_dir()">DB_ENV->set_data_dir()</a>
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method, or by setting the "set_data_dir" string
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in the environment's <a href="../../programmer_reference/env_db_config.html#env_db_config.DB_CONFIG" class="olink">DB_CONFIG</a> file.
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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="id3863284"></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->remove()</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="id3863978"></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()">DB->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 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="id3863994"></a>ENOENT</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 file or directory does not exist.
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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="id3863957"></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="id3864009"></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="dbput.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="dbrename.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->put() </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"> DB->rename()</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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