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4.3 KiB
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<!--$Id: env_close.so,v 10.21 2000/03/01 21:41:29 bostic Exp $-->
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<!--Copyright 1997, 1998, 1999, 2000 by Sleepycat Software, Inc.-->
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<!--All rights reserved.-->
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<html>
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<head>
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<title>Berkeley DB: DbEnv.close</title>
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<meta name="description" content="Berkeley DB: An embedded database programmatic toolkit.">
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<meta name="keywords" content="embedded,database,programmatic,toolkit,b+tree,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,java,C,C++">
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</head>
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<body bgcolor=white>
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<a name="2"><!--meow--></a>
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<table><tr valign=top>
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<td>
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<h1>DbEnv.close</h1>
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</td>
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<td width="1%">
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<a href="../api_java/java_index.html"><img src="../images/api.gif" alt="API"></a><a href="../ref/toc.html"><img src="../images/ref.gif" alt="Ref"></a>
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</td></tr></table>
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<hr size=1 noshade>
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<tt>
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<h3><pre>
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import com.sleepycat.db.*;
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<p>
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public void close(int flags)
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throws DbException;
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</pre></h3>
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<h1>Description</h1>
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<p>The DbEnv.close method closes the Berkeley DB environment, freeing any
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allocated resources and closing any underlying subsystems.
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<p>Calling DbEnv.close does not imply closing any databases that were
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opened in the environment.
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<p>The <b>flags</b> parameter is currently unused, and must be set to 0.
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<p>Where the environment was initialized with the <a href="../api_java/env_open.html#DB_INIT_LOCK">Db.DB_INIT_LOCK</a> flag,
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calling DbEnv.close does not release any locks still held by the
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closing process, providing functionality for long-lived locks.
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<p>Where the environment was initialized with the <a href="../api_java/env_open.html#DB_INIT_MPOOL">Db.DB_INIT_MPOOL</a>
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flag, calling DbEnv.close implies calls to <a href="../api_java/memp_fclose.html">DbMpoolFile.close</a> for
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any remaining open files in the memory pool that were returned to this
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process by calls to <a href="../api_java/memp_fopen.html">DbMpoolFile.open</a>. It does not imply a call to
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<a href="../api_java/memp_fsync.html">DbMpoolFile.sync</a> for those files.
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<p>Where the environment was initialized with the <a href="../api_java/env_open.html#DB_INIT_TXN">Db.DB_INIT_TXN</a> flag,
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calling DbEnv.close aborts any uncommitted transactions.
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(Applications are should not depend on this behavior. If the process' has
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already closed a database handle which is necessary to abort an
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uncommitted transaction, the Berkeley DB environment must then require that
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recovery be run before further operations are done, since once a
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transaction exists that cannot be committed or aborted, no future
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checkpoint can ever succeed.)
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<p>In multi-threaded applications, only a single thread may call
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DbEnv.close.
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<p>Once DbEnv.close has been called, regardless of its return,
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the Berkeley DB environment handle may not be accessed again.
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<p>The DbEnv.close method throws an exception that encapsulates a non-zero error value on
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failure.
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<h1>Errors</h1>
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<p>The DbEnv.close method may fail and throw an exception for errors specified for other Berkeley DB and C library or system methods.
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If a catastrophic error has occurred, the DbEnv.close method may fail and throw
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a <a href="../api_java/runrec_class.html">DbRunRecoveryException</a>, in which case all subsequent Berkeley DB calls
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will fail in the same way.
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<h3>Class</h3>
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<a href="../api_java/dbenv_class.html">DbEnv</a>
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<h1>See Also</h1>
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<a href="../api_java/env_close.html">DbEnv.close</a>,
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<a href="../api_java/env_open.html">DbEnv.open</a>,
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<a href="../api_java/env_remove.html">DbEnv.remove</a>,
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<a href="../api_java/env_strerror.html">DbEnv.strerror</a>,
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<a href="../api_java/env_version.html">DbEnv.get_version_string</a>
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<a href="../api_java/env_set_cachesize.html">DbEnv.set_cachesize</a>,
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<a href="../api_java/env_set_errcall.html">DbEnv.set_errcall</a>,
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<a href="../api_java/env_set_error_stream.html">DbEnv.set_error_stream</a>,
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<a href="../api_java/env_set_errpfx.html">DbEnv.set_errpfx</a>,
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<a href="../api_java/env_set_flags.html">DbEnv.set_flags</a>,
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<a href="../api_java/env_set_mutexlocks.html">DbEnv.set_mutexlocks</a>,
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and
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<a href="../api_java/env_set_verbose.html">DbEnv.set_verbose</a>.
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</tt>
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<table><tr><td><br></td><td width="1%">
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<a href="../api_java/java_index.html"><img src="../images/api.gif" alt="API"></a><a href="../ref/toc.html"><img src="../images/ref.gif" alt="Ref"></a>
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</td></tr></table>
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