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73 lines
3.5 KiB
HTML
<!--$Id: dbenv_cxx.so,v 11.10 2000/12/01 17:59:32 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 Reference Guide: Release 3.0: the DbEnv class for C++ and Java</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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<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/value_set.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/db_cxx.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: the DbEnv class for C++ and Java</h1>
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<p>The DbEnv::appinit() method and two constructors for the DbEnv class are
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gone. There is now a single way to create and initialize the environment.
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The way to create an environment is to use the new DbEnv constructor with
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one argument. After this call, the DbEnv can be configured with various
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set_XXX methods. Finally, a call to DbEnv::open is made to initialize
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the environment.
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<p>Here's a C++ example creating a Berkeley DB environment using the 2.X interface
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<p><blockquote><pre>int dberr;
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DbEnv *dbenv = new DbEnv();
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<p>
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dbenv->set_error_stream(&cerr);
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dbenv->set_errpfx("myprog");
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<p>
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if ((dberr = dbenv->appinit("/database/home",
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NULL, DB_CREATE | DB_INIT_LOCK | DB_INIT_MPOOL)) != 0) {
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cerr << "failure: " << strerror(dberr);
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exit (1);
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}</pre></blockquote>
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<p>In the Berkeley DB 3.0 release, this code would be written as:
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<p><blockquote><pre>int dberr;
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DbEnv *dbenv = new DbEnv(0);
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<p>
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dbenv->set_error_stream(&cerr);
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dbenv->set_errpfx("myprog");
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<p>
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if ((dberr = dbenv->open("/database/home",
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NULL, DB_CREATE | DB_INIT_LOCK | DB_INIT_MPOOL, 0)) != 0) {
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cerr << "failure: " << dbenv->strerror(dberr);
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exit (1);
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}</pre></blockquote>
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<p>Here's a Java example creating a Berkeley DB environment using the 2.X interface:
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<p><blockquote><pre>int dberr;
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DbEnv dbenv = new DbEnv();
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<p>
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dbenv.set_error_stream(System.err);
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dbenv.set_errpfx("myprog");
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<p>
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dbenv.appinit("/database/home",
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null, Db.DB_CREATE | Db.DB_INIT_LOCK | Db.DB_INIT_MPOOL);</pre></blockquote>
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<p>In the Berkeley DB 3.0 release, this code would be written as:
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<p><blockquote><pre>int dberr;
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DbEnv dbenv = new DbEnv(0);
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<p>
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dbenv.set_error_stream(System.err);
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dbenv.set_errpfx("myprog");
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<p>
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dbenv.open("/database/home",
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null, Db.DB_CREATE | Db.DB_INIT_LOCK | Db.DB_INIT_MPOOL, 0);</pre></blockquote>
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<p>In the Berkeley DB 2.X release, DbEnv had accessors to obtain "managers" of type
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DbTxnMgr, DbMpool, DbLog, DbTxnMgr. If you used any of these managers,
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all their methods are now found directly in the DbEnv class.
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<table><tr><td><br></td><td width="1%"><a href="../../ref/upgrade.3.0/value_set.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/db_cxx.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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</html>
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