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86 lines
4.3 KiB
HTML
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
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<title>Db class for C++ and Java</title>
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<link rel="stylesheet" href="gettingStarted.css" type="text/css" />
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<meta name="generator" content="DocBook XSL Stylesheets V1.73.2" />
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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_dbenv_cxx.html" title="DbEnv class for C++ and Java" />
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<link rel="next" href="upgrade_3_0_cxx.html" title="additional C++ changes" />
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</head>
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<body>
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<div xmlns="" class="navheader">
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<div class="libver">
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<p>Library Version 11.2.5.2</p>
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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">Db 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_dbenv_cxx.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_cxx.html">Next</a></td>
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</tr>
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</table>
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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_db_cxx"></a>Db 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 static Db::open method and the DbInfo class have been removed in the
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Berkeley DB 3.0 release. The way to open a database file is to use the new Db
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constructor with two arguments, followed by set_XXX methods to configure
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the Db object, and finally a call to the new (nonstatic) Db::open(). In
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comparing the Berkeley DB 3.0 release open method with the 2.X static open
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method, the second argument is new. It is a database name, which can
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be null. The DbEnv argument has been removed, as the environment is now
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specified in the constructor. The open method no longer returns a Db,
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since it operates on one.</p>
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<p>Here's a C++ example opening a Berkeley DB database using the 2.X interface:</p>
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<pre class="programlisting">// Note: by default, errors are thrown as exceptions
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Db *table;
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Db::open("lookup.db", DB_BTREE, DB_CREATE, 0644, dbenv, 0, &table);</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">// Note: by default, errors are thrown as exceptions
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Db *table = new Db(dbenv, 0);
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table->open("lookup.db", NULL, DB_BTREE, DB_CREATE, 0644);</pre>
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<p>Here's a Java example opening a Berkeley DB database using the 2.X interface:</p>
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<pre class="programlisting">// Note: errors are thrown as exceptions
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Db table = Db.open("lookup.db", Db.DB_BTREE, Db.DB_CREATE, 0644, dbenv, 0);</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">// Note: errors are thrown as exceptions
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Db table = new Db(dbenv, 0);
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table.open("lookup.db", null, Db.DB_BTREE, Db.DB_CREATE, 0644);</pre>
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<p>Note that if the dbenv argument is null, the database will not exist
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within an environment.</p>
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</div>
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<div class="navfooter">
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<hr />
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<table width="100%" summary="Navigation footer">
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<tr>
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<td width="40%" align="left"><a accesskey="p" href="upgrade_3_0_dbenv_cxx.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_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">DbEnv class for C++ and Java </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"> additional C++ changes</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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