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HTML
79 lines
4.1 KiB
HTML
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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 callback functions, app_private field</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_2_toc.html" title="Chapter 12. Upgrading Berkeley DB 3.1 applications to Berkeley DB 3.2" />
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<link rel="prev" href="upgrade_3_2_set_flags.html" title="DB_ENV->set_flags" />
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<link rel="next" href="upgrade_3_2_renumber.html" title="Logically renumbering records" />
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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 callback functions, app_private field</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_2_set_flags.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 12. Upgrading Berkeley DB 3.1 applications to Berkeley DB 3.2</th>
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<td width="20%" align="right"> <a accesskey="n" href="upgrade_3_2_renumber.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_2_callback"></a>DB callback functions, app_private field</h2>
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</div>
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</div>
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</div>
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<p>In the Berkeley DB 3.2 release, four application callback functions (the
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callback functions set by <a href="../api_reference/C/dbset_bt_compare.html" class="olink">DB->set_bt_compare()</a>,
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<a href="../api_reference/C/dbset_bt_prefix.html" class="olink">DB->set_bt_prefix()</a>, <a href="../api_reference/C/dbset_dup_compare.html" class="olink">DB->set_dup_compare()</a> and
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<a href="../api_reference/C/dbset_h_hash.html" class="olink">DB->set_h_hash()</a>) were modified to take a reference to a
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<a href="../api_reference/C/db.html" class="olink">DB</a> object as their first argument. This change allows the Berkeley DB
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Java API to reasonably support these interfaces. There is currently no
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need for the callback functions to do anything with this additional
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argument.</p>
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<p>C and C++ applications that specify their own Btree key comparison,
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Btree prefix comparison, duplicate data item comparison or Hash
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functions should modify these functions to take a reference to a
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<a href="../api_reference/C/db.html" class="olink">DB</a> structure as their first argument. No further change is
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required.</p>
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<p>The app_private field of the <a href="../api_reference/C/dbt.html" class="olink">DBT</a> structure (accessible only from
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the Berkeley DB C API) has been removed in the 3.2 release. It was replaced
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with app_private fields in the <a href="../api_reference/C/env.html" class="olink">DB_ENV</a> handles.
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Applications using this field will have to convert to using one of the
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replacement fields.</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_2_set_flags.html">Prev</a> </td>
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<td width="20%" align="center">
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<a accesskey="u" href="upgrade_3_2_toc.html">Up</a>
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</td>
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<td width="40%" align="right"> <a accesskey="n" href="upgrade_3_2_renumber.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_ENV->set_flags </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"> Logically renumbering records</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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