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190 lines
7.3 KiB
HTML
190 lines
7.3 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>Dbc::close()</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="dbc.html" title="Chapter 3. The Dbc Handle" />
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<link rel="prev" href="dbcursor.html" title="Db::cursor()" />
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<link rel="next" href="dbccmp.html" title="Dbc::cmp()" />
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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">Dbc::close()</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="dbcursor.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 3.
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The Dbc Handle
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</th>
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<td width="20%" align="right"> <a accesskey="n" href="dbccmp.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="dbcclose"></a>Dbc::close()</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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Dbc::close(void);</pre>
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<p>
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The <code class="methodname">Dbc::close()</code> method discards the cursor.
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</p>
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<p>
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It is possible for the <code class="methodname">Dbc::close()</code> method to return <a href="../../programmer_reference/program_errorret.html#program_errorret.DB_LOCK_DEADLOCK" class="olink">DB_LOCK_DEADLOCK</a>,
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signaling that any enclosing transaction should be aborted. If the
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application is already intending to abort the transaction, this error
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should be ignored, and the application should proceed.
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</p>
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<p>
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After the <code class="methodname">Dbc::close()</code> method has been called, regardless of its return value,
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you can not use the cursor handle again.
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</p>
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<p>
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It is not required to close the cursor explicitly before closing the database handle or the transaction handle that owns this cursor
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because, closing a database handle or a transaction handle closes those open cursors.
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</p>
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<p>
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However, it is recommended that you always close all cursor handles immediately after
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their use to promote concurrency and to release resources such as page locks.
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</p>
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<p>
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The <code class="methodname">Dbc::close()</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="id3603640"></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">Dbc::close()</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="id3604126"></a><span>DbDeadlockException or </span>DB_LOCK_DEADLOCK</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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A transactional database environment operation was selected to resolve
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a deadlock.
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</p>
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<p>
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<a class="xref" href="dbdeadlock.html" title="DbDeadlockException">DbDeadlockException</a> is thrown if
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your Berkeley DB API is configured to throw exceptions.
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Otherwise, <code class="literal">DB_LOCK_DEADLOCK</code> is returned.
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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="id3603908"></a><span>DbLockNotGrantedException or </span>DB_LOCK_NOTGRANTED</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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A Berkeley DB Concurrent Data Store database environment configured
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for lock timeouts was unable to grant a lock in the allowed time.
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</p>
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<p>
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<a class="xref" href="dblocknotgranted.html" title="DbLockNotGrantedException">DbLockNotGrantedException</a> is thrown if
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your Berkeley DB API is configured to throw exceptions.
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Otherwise, <code class="literal">DB_LOCK_NOTGRANTED</code> is returned.
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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="id3603958"></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 cursor is already closed; 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="id3603868"></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="dbc.html" title="Chapter 3. The Dbc Handle">Dbc</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="id3603651"></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="dbc.html#dbclist" title="Database Cursors and Related Methods">Database Cursors 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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|||
|
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<tr>
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<td width="40%" align="left"><a accesskey="p" href="dbcursor.html">Prev</a> </td>
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|||
|
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<td width="20%" align="center">
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<a accesskey="u" href="dbc.html">Up</a>
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|||
|
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</td>
|
|||
|
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<td width="40%" align="right"> <a accesskey="n" href="dbccmp.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::cursor() </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"> Dbc::cmp()</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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