<!--$Id: func.so,v 11.9 2001/03/01 15:58:20 bostic Exp $--> <!--Copyright (c) 1997,2008 Oracle. All rights reserved.--> <!--See the file LICENSE for redistribution information.--> <html> <head> <title>Berkeley DB Reference Guide: Release 3.0: function arguments</title> <meta name="description" content="Berkeley DB: An embedded database programmatic toolkit."> <meta name="keywords" content="embedded,database,programmatic,toolkit,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,Java,C,C++"> </head> <body bgcolor=white> <table width="100%"><tr valign=top> <td><b><dl><dt>Berkeley DB Reference Guide:<dd>Upgrading Berkeley DB Applications</dl></b></td> <td align=right><a href="../upgrade.3.0/envopen.html"><img src="../../images/prev.gif" alt="Prev"></a><a href="../toc.html"><img src="../../images/ref.gif" alt="Ref"></a><a href="../upgrade.3.0/dbenv.html"><img src="../../images/next.gif" alt="Next"></a> </td></tr></table> <p align=center><b>Release 3.0: function arguments</b></p> <p>In Berkeley DB 3.0, there are no longer separate structures that represent each subsystem (for example, DB_LOCKTAB or DB_TXNMGR), and an overall <a href="../../api_c/env_class.html">DB_ENV</a> environment structure. Instead there is only the <a href="../../api_c/env_class.html">DB_ENV</a> structure. This means that <a href="../../api_c/env_class.html">DB_ENV</a> references should be passed around by your application instead of passing around DB_LOCKTAB or DB_TXNMGR references.</p> <p>Each of the following functions:</p> <blockquote><pre>lock_detect lock_get lock_id lock_put lock_stat lock_vec</pre></blockquote> <p>should have its first argument, a reference to the DB_LOCKTAB structure, replaced with a reference to the enclosing <a href="../../api_c/env_class.html">DB_ENV</a> structure. For example, the following line of code from a Berkeley DB 2.X application:</p> <blockquote><pre>DB_LOCKTAB *lt; DB_LOCK lock; ret = lock_put(lt, lock);</pre></blockquote> <p>should now be written as follows:</p> <blockquote><pre>DB_ENV *dbenv; DB_LOCK *lock; ret = lock_put(dbenv, lock);</pre></blockquote> <p>Similarly, all of the functions:</p> <blockquote><pre>log_archive log_compare log_file log_flush log_get log_put log_register log_stat log_unregister</pre></blockquote> <p>should have their DB_LOG argument replaced with a reference to a <a href="../../api_c/env_class.html">DB_ENV</a> structure, and the functions:</p> <blockquote><pre>memp_fopen memp_register memp_stat memp_sync memp_trickle</pre></blockquote> <p>should have their DB_MPOOL argument replaced with a reference to a <a href="../../api_c/env_class.html">DB_ENV</a> structure.</p> <p>You should remove all references to DB_LOCKTAB, DB_LOG, DB_MPOOL, and DB_TXNMGR structures from your application, they are no longer useful in any way. In fact, a simple way to identify all of the places that need to be upgraded is to remove all such structures and variables they declare, and then compile. You will see a warning message from your compiler in each case that needs to be upgraded.</p> <table width="100%"><tr><td><br></td><td align=right><a href="../upgrade.3.0/envopen.html"><img src="../../images/prev.gif" alt="Prev"></a><a href="../toc.html"><img src="../../images/ref.gif" alt="Ref"></a><a href="../upgrade.3.0/dbenv.html"><img src="../../images/next.gif" alt="Next"></a> </td></tr></table> <p><font size=1>Copyright (c) 1996,2008 Oracle. All rights reserved.</font> </body> </html>