2011-09-13 17:44:24 +00:00
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<title>DbEnv class for C++ and Java</title>
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<link rel="start" href="index.html" title="Berkeley DB Upgrade Guide" />
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<link rel="up" href="upgrade_3_0_toc.html" title="Chapter 14. Upgrading Berkeley DB 2.X applications to Berkeley DB 3.0" />
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<link rel="prev" href="upgrade_3_0_value_set.html" title="db_value_set" />
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<div class="libver">
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2012-11-14 21:35:20 +00:00
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<p>Library Version 11.2.5.3</p>
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2011-09-13 17:44:24 +00:00
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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">DbEnv class for C++ and Java</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="upgrade_3_0_value_set.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 14. Upgrading Berkeley DB 2.X applications to Berkeley DB 3.0</th>
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<td width="20%" align="right"> <a accesskey="n" href="upgrade_3_0_db_cxx.html">Next</a></td>
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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="upgrade_3_0_dbenv_cxx"></a>DbEnv class for C++ and Java</h2>
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</div>
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</div>
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</div>
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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.</p>
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<p>Here's a C++ example creating a Berkeley DB environment using the 2.X interface</p>
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<pre class="programlisting">int dberr;
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DbEnv *dbenv = new DbEnv();
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dbenv->set_error_stream(&cerr);
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dbenv->set_errpfx("myprog");
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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>
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<p>In the Berkeley DB 3.0 release, this code would be written as:</p>
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<pre class="programlisting">int dberr;
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DbEnv *dbenv = new DbEnv(0);
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dbenv->set_error_stream(&cerr);
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dbenv->set_errpfx("myprog");
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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>
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<p>Here's a Java example creating a Berkeley DB environment using the 2.X interface:</p>
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<pre class="programlisting">int dberr;
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DbEnv dbenv = new DbEnv();
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dbenv.set_error_stream(System.err);
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dbenv.set_errpfx("myprog");
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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>
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<p>In the Berkeley DB 3.0 release, this code would be written as:</p>
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<pre class="programlisting">int dberr;
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DbEnv dbenv = new DbEnv(0);
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dbenv.set_error_stream(System.err);
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dbenv.set_errpfx("myprog");
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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>
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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.</p>
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<tr>
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<td width="40%" align="left"><a accesskey="p" href="upgrade_3_0_value_set.html">Prev</a> </td>
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<td width="20%" align="center">
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<a accesskey="u" href="upgrade_3_0_toc.html">Up</a>
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</td>
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<td width="40%" align="right"> <a accesskey="n" href="upgrade_3_0_db_cxx.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_value_set </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"> Db class for C++ and Java</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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