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3.2 KiB
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<!--$Id: func.so,v 11.8 2000/03/18 21:43:20 bostic Exp $-->
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<!--Copyright 1997, 1998, 1999, 2000 by Sleepycat Software, Inc.-->
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<html>
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<head>
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<title>Berkeley DB Reference Guide: Release 3.0: function arguments</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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<body bgcolor=white>
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<table><tr valign=top>
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<td><h3><dl><dt>Berkeley DB Reference Guide:<dd>Upgrading Berkeley DB Applications</dl></h3></td>
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<td width="1%"><a href="../../ref/upgrade.3.0/envopen.html"><img src="../../images/prev.gif" alt="Prev"></a><a href="../../ref/toc.html"><img src="../../images/ref.gif" alt="Ref"></a><a href="../../ref/upgrade.3.0/dbenv.html"><img src="../../images/next.gif" alt="Next"></a>
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</td></tr></table>
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<p>
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<h1 align=center>Release 3.0: function arguments</h1>
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<p>In Berkeley DB 3.0, there are no longer separate structures that
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represent each subsystem (e.g., DB_LOCKTAB or DB_TXNMGR), and an overall
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DB_ENV environment structure. Instead there is only the
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DB_ENV structure. This means that DB_ENV references should
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be passed around by your application instead of passing around DB_LOCKTAB
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or DB_TXNMGR references.
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<p>Each of the following functions:
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<p><blockquote><pre>lock_detect
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lock_get
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lock_id
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lock_put
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lock_stat
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lock_vec</pre></blockquote>
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<p>should have its first argument, a reference to the DB_LOCKTAB structure,
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replaced with a reference to the enclosing DB_ENV structure. For
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example, the following line of code from a Berkeley DB 2.X application:
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<p><blockquote><pre>DB_LOCKTAB *lt;
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DB_LOCK lock;
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ret = lock_put(lt, lock);</pre></blockquote>
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<p>should now be written as follows:
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<p><blockquote><pre>DB_ENV *dbenv;
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DB_LOCK *lock;
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ret = lock_put(dbenv, lock);</pre></blockquote>
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<p>Similarly, all of the functions:
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<p><blockquote><pre>log_archive
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log_compare
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log_file
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log_flush
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log_get
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log_put
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log_register
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log_stat
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log_unregister</pre></blockquote>
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<p>should have their DB_LOG argument replaced with a reference to a
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DB_ENV structure, and the functions:
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<p><blockquote><pre>memp_fopen
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memp_register
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memp_stat
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memp_sync
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memp_trickle</pre></blockquote>
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<p>should have their DB_MPOOL argument replaced with a reference to a
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DB_ENV structure.
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<p>You should remove all references to DB_LOCKTAB, DB_LOG, DB_MPOOL, and
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DB_TXNMGR structures from your application, they are no longer useful
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in any way. In fact, a simple way to identify all of the places that
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need to be upgraded is to remove all such structures and variables
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they declare, and then compile. You will see a warning message from
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your compiler in each case that needs to be upgraded.
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<table><tr><td><br></td><td width="1%"><a href="../../ref/upgrade.3.0/envopen.html"><img src="../../images/prev.gif" alt="Prev"></a><a href="../../ref/toc.html"><img src="../../images/ref.gif" alt="Ref"></a><a href="../../ref/upgrade.3.0/dbenv.html"><img src="../../images/next.gif" alt="Next"></a>
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</td></tr></table>
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<p><font size=1><a href="http://www.sleepycat.com">Copyright Sleepycat Software</a></font>
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</body>
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