mirror of
https://github.com/berkeleydb/libdb.git
synced 2024-11-17 09:36:24 +00:00
79 lines
4.1 KiB
HTML
79 lines
4.1 KiB
HTML
|
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
|
|||
|
|
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
|
|||
|
|
<html xmlns="http://www.w3.org/1999/xhtml">
|
|||
|
|
<head>
|
|||
|
|
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
|
|||
|
|
<title>DB callback functions, app_private field</title>
|
|||
|
|
<link rel="stylesheet" href="gettingStarted.css" type="text/css" />
|
|||
|
|
<meta name="generator" content="DocBook XSL Stylesheets V1.73.2" />
|
|||
|
|
<link rel="start" href="index.html" title="Berkeley DB Upgrade Guide" />
|
|||
|
|
<link rel="up" href="upgrade_3_2_toc.html" title="Chapter 12. Upgrading Berkeley DB 3.1 applications to Berkeley DB 3.2" />
|
|||
|
|
<link rel="prev" href="upgrade_3_2_set_flags.html" title="DB_ENV->set_flags" />
|
|||
|
|
<link rel="next" href="upgrade_3_2_renumber.html" title="Logically renumbering records" />
|
|||
|
|
</head>
|
|||
|
|
<body>
|
|||
|
|
<div xmlns="" class="navheader">
|
|||
|
|
<div class="libver">
|
|||
|
|
<p>Library Version 11.2.5.2</p>
|
|||
|
|
</div>
|
|||
|
|
<table width="100%" summary="Navigation header">
|
|||
|
|
<tr>
|
|||
|
|
<th colspan="3" align="center">DB callback functions, app_private field</th>
|
|||
|
|
</tr>
|
|||
|
|
<tr>
|
|||
|
|
<td width="20%" align="left"><a accesskey="p" href="upgrade_3_2_set_flags.html">Prev</a> </td>
|
|||
|
|
<th width="60%" align="center">Chapter 12. Upgrading Berkeley DB 3.1 applications to Berkeley DB 3.2</th>
|
|||
|
|
<td width="20%" align="right"> <a accesskey="n" href="upgrade_3_2_renumber.html">Next</a></td>
|
|||
|
|
</tr>
|
|||
|
|
</table>
|
|||
|
|
<hr />
|
|||
|
|
</div>
|
|||
|
|
<div class="sect1" lang="en" xml:lang="en">
|
|||
|
|
<div class="titlepage">
|
|||
|
|
<div>
|
|||
|
|
<div>
|
|||
|
|
<h2 class="title" style="clear: both"><a id="upgrade_3_2_callback"></a>DB callback functions, app_private field</h2>
|
|||
|
|
</div>
|
|||
|
|
</div>
|
|||
|
|
</div>
|
|||
|
|
<p>In the Berkeley DB 3.2 release, four application callback functions (the
|
|||
|
|
callback functions set by <a href="../api_reference/C/dbset_bt_compare.html" class="olink">DB->set_bt_compare()</a>,
|
|||
|
|
<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
|
|||
|
|
<a href="../api_reference/C/dbset_h_hash.html" class="olink">DB->set_h_hash()</a>) were modified to take a reference to a
|
|||
|
|
<a href="../api_reference/C/db.html" class="olink">DB</a> object as their first argument. This change allows the Berkeley DB
|
|||
|
|
Java API to reasonably support these interfaces. There is currently no
|
|||
|
|
need for the callback functions to do anything with this additional
|
|||
|
|
argument.</p>
|
|||
|
|
<p>C and C++ applications that specify their own Btree key comparison,
|
|||
|
|
Btree prefix comparison, duplicate data item comparison or Hash
|
|||
|
|
functions should modify these functions to take a reference to a
|
|||
|
|
<a href="../api_reference/C/db.html" class="olink">DB</a> structure as their first argument. No further change is
|
|||
|
|
required.</p>
|
|||
|
|
<p>The app_private field of the <a href="../api_reference/C/dbt.html" class="olink">DBT</a> structure (accessible only from
|
|||
|
|
the Berkeley DB C API) has been removed in the 3.2 release. It was replaced
|
|||
|
|
with app_private fields in the <a href="../api_reference/C/env.html" class="olink">DB_ENV</a> handles.
|
|||
|
|
Applications using this field will have to convert to using one of the
|
|||
|
|
replacement fields.</p>
|
|||
|
|
</div>
|
|||
|
|
<div class="navfooter">
|
|||
|
|
<hr />
|
|||
|
|
<table width="100%" summary="Navigation footer">
|
|||
|
|
<tr>
|
|||
|
|
<td width="40%" align="left"><a accesskey="p" href="upgrade_3_2_set_flags.html">Prev</a> </td>
|
|||
|
|
<td width="20%" align="center">
|
|||
|
|
<a accesskey="u" href="upgrade_3_2_toc.html">Up</a>
|
|||
|
|
</td>
|
|||
|
|
<td width="40%" align="right"> <a accesskey="n" href="upgrade_3_2_renumber.html">Next</a></td>
|
|||
|
|
</tr>
|
|||
|
|
<tr>
|
|||
|
|
<td width="40%" align="left" valign="top">DB_ENV->set_flags </td>
|
|||
|
|
<td width="20%" align="center">
|
|||
|
|
<a accesskey="h" href="index.html">Home</a>
|
|||
|
|
</td>
|
|||
|
|
<td width="40%" align="right" valign="top"> Logically renumbering records</td>
|
|||
|
|
</tr>
|
|||
|
|
</table>
|
|||
|
|
</div>
|
|||
|
|
</body>
|
|||
|
|
</html>
|