2011-09-13 17:44:24 +00:00
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<?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 structure</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_xa.html" title="db_xa_open" />
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<link rel="next" href="upgrade_3_0_dbinfo.html" title="DBINFO structure" />
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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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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">DB structure</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_xa.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_dbinfo.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"></a>DB structure</h2>
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</div>
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</div>
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</div>
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<p>The <a href="../api_reference/C/db.html" class="olink">DB</a> structure is now opaque for applications in the Berkeley DB 3.0
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release. Accesses to any fields within that structure by the application
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should be replaced with method calls. The following example illustrates
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this using the historic type structure field. In the Berkeley DB 2.X releases,
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applications could find the type of an underlying database using code
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similar to the following:</p>
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<pre class="programlisting">DB *db;
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DB_TYPE type;
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type = db->type;</pre>
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<p>in the Berkeley DB 3.X releases, this should be done using the
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<a href="../api_reference/C/dbget_type.html" class="olink">DB->get_type()</a> method, as follows:</p>
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<pre class="programlisting">DB *db;
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DB_TYPE type;
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type = db->get_type(db);</pre>
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<p>The following table lists the <a href="../api_reference/C/db.html" class="olink">DB</a> fields previously used by
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applications and the methods that should now be used to get or set them.</p>
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<div class="informaltable">
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<table border="1" width="80%">
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<colgroup>
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<col />
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<col />
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</colgroup>
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<thead>
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<tr>
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<th><a href="../api_reference/C/db.html" class="olink">DB</a> field</th>
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<th>Berkeley DB 3.X method</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td>byteswapped</td>
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<td>
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<a href="../api_reference/C/dbget_byteswapped.html" class="olink">DB->get_byteswapped()</a>
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</td>
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</tr>
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<tr>
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<td>db_errcall</td>
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<td>
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<a href="../api_reference/C/dbset_errcall.html" class="olink">DB->set_errcall()</a>
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</td>
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</tr>
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<tr>
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<td>db_errfile</td>
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<td>
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<a href="../api_reference/C/dbset_errfile.html" class="olink">DB->set_errfile()</a>
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</td>
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</tr>
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<tr>
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<td>db_errpfx</td>
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<td>
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<a href="../api_reference/C/dbset_errpfx.html" class="olink">DB->set_errpfx()</a>
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</td>
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</tr>
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<tr>
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<td>db_paniccall</td>
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<td>DB->set_paniccall</td>
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</tr>
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<tr>
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<td>type</td>
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<td>
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<a href="../api_reference/C/dbget_type.html" class="olink">DB->get_type()</a>
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</td>
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</tr>
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</tbody>
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</table>
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</div>
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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_xa.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_dbinfo.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_xa_open </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"> DBINFO structure</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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