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-<!--$Id: db_set_bt_compare.so,v 10.24 2000/10/26 15:20:40 bostic Exp $-->
-<!--Copyright 1997, 1998, 1999, 2000 by Sleepycat Software, Inc.-->
-<!--All rights reserved.-->
-<html>
-<head>
-<title>Berkeley DB: DB-&gt;set_bt_compare</title>
-<meta name="description" content="Berkeley DB: An embedded database programmatic toolkit.">
-<meta name="keywords" content="embedded,database,programmatic,toolkit,b+tree,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,java,C,C++">
-</head>
-<body bgcolor=white>
- <a name="2"><!--meow--></a>
-<table><tr valign=top>
-<td>
-<h1>DB-&gt;set_bt_compare</h1>
-</td>
-<td width="1%">
-<a href="../api_c/c_index.html"><img src="../images/api.gif" alt="API"></a><a href="../ref/toc.html"><img src="../images/ref.gif" alt="Ref"></a>
-</td></tr></table>
-<hr size=1 noshade>
-<tt>
-<h3><pre>
-#include &lt;db.h&gt;
-<p>
-int
-DB-&gt;set_bt_compare(DB *db,
- int (*bt_compare_fcn)(DB *, const DBT *, const DBT *));
-</pre></h3>
-<h1>Description</h1>
-<p>Set the Btree key comparison function. The comparison function is
-called when it is necessary to compare a key specified by the
-application with a key currently stored in the tree. The first argument
-to the comparison function is the <a href="../api_c/dbt.html">DBT</a> representing the
-application supplied key, the second is the current tree's key.
-<p>The comparison function must return an integer value less than, equal
-to, or greater than zero if the first key argument is considered to be
-respectively less than, equal to, or greater than the second key
-argument. In addition, the comparison function must cause the keys in
-the database to be <i>well-ordered</i>. The comparison function
-must correctly handle any key values used by the application (possibly
-including zero-length keys). In addition, when Btree key prefix
-comparison is being performed (see <a href="../api_c/db_set_bt_prefix.html">DB-&gt;set_bt_prefix</a> for more
-information), the comparison routine may be passed a prefix of any
-database key. The <b>data</b> and <b>size</b> fields of the
-<a href="../api_c/dbt.html">DBT</a> are the only fields that may be used for the purposes of
-this comparison.
-<p>If no comparison function is specified, the keys are compared lexically,
-with shorter keys collating before longer keys. The same comparison
-method must be used each time a particular Btree is opened.
-<p>The DB-&gt;set_bt_compare interface may only be used to configure Berkeley DB before
-the <a href="../api_c/db_open.html">DB-&gt;open</a> interface is called.
-<p>The DB-&gt;set_bt_compare function returns a non-zero error value on failure and 0 on success.
-<h1>Errors</h1>
-<p><dl compact>
-<p><dt>EINVAL<dd>An invalid flag value or parameter was specified.
-<p>Called after <a href="../api_c/db_open.html">DB-&gt;open</a> was called.
-</dl>
-<h1>See Also</h1>
-<a href="../api_c/db_create.html">db_create</a>,
-<a href="../api_c/db_close.html">DB-&gt;close</a>,
-<a href="../api_c/db_cursor.html">DB-&gt;cursor</a>,
-<a href="../api_c/db_del.html">DB-&gt;del</a>,
-<a href="../api_c/db_err.html">DB-&gt;err</a>,
-<a href="../api_c/db_fd.html">DB-&gt;fd</a>,
-<a href="../api_c/db_get.html">DB-&gt;get</a>,
-<a href="../api_c/db_get_byteswapped.html">DB-&gt;get_byteswapped</a>,
-<a href="../api_c/db_get_type.html">DB-&gt;get_type</a>,
-<a href="../api_c/db_join.html">DB-&gt;join</a>,
-<a href="../api_c/db_key_range.html">DB-&gt;key_range</a>,
-<a href="../api_c/db_open.html">DB-&gt;open</a>,
-<a href="../api_c/db_put.html">DB-&gt;put</a>,
-<a href="../api_c/db_remove.html">DB-&gt;remove</a>,
-<a href="../api_c/db_set_bt_compare.html">DB-&gt;set_bt_compare</a>,
-<a href="../api_c/db_set_bt_minkey.html">DB-&gt;set_bt_minkey</a>,
-<a href="../api_c/db_set_bt_prefix.html">DB-&gt;set_bt_prefix</a>,
-<a href="../api_c/db_set_cachesize.html">DB-&gt;set_cachesize</a>,
-<a href="../api_c/db_set_dup_compare.html">DB-&gt;set_dup_compare</a>,
-<a href="../api_c/db_set_errcall.html">DB-&gt;set_errcall</a>,
-<a href="../api_c/db_set_errfile.html">DB-&gt;set_errfile</a>,
-<a href="../api_c/db_set_errpfx.html">DB-&gt;set_errpfx</a>,
-<a href="../api_c/db_set_flags.html">DB-&gt;set_flags</a>,
-<a href="../api_c/db_set_h_ffactor.html">DB-&gt;set_h_ffactor</a>,
-<a href="../api_c/db_set_h_hash.html">DB-&gt;set_h_hash</a>,
-<a href="../api_c/db_set_h_nelem.html">DB-&gt;set_h_nelem</a>,
-<a href="../api_c/db_set_lorder.html">DB-&gt;set_lorder</a>,
-<a href="../api_c/db_set_malloc.html">DB-&gt;set_malloc</a>,
-<a href="../api_c/db_set_pagesize.html">DB-&gt;set_pagesize</a>,
-<a href="../api_c/db_set_paniccall.html">DB-&gt;set_paniccall</a>,
-<a href="../api_c/db_set_q_extentsize.html">DB-&gt;set_q_extentsize</a>,
-<a href="../api_c/db_set_realloc.html">DB-&gt;set_realloc</a>,
-<a href="../api_c/db_set_re_delim.html">DB-&gt;set_re_delim</a>,
-<a href="../api_c/db_set_re_len.html">DB-&gt;set_re_len</a>,
-<a href="../api_c/db_set_re_pad.html">DB-&gt;set_re_pad</a>,
-<a href="../api_c/db_set_re_source.html">DB-&gt;set_re_source</a>,
-<a href="../api_c/db_stat.html">DB-&gt;stat</a>,
-<a href="../api_c/db_sync.html">DB-&gt;sync</a>,
-<a href="../api_c/db_upgrade.html">DB-&gt;upgrade</a>
-and
-<a href="../api_c/db_verify.html">DB-&gt;verify</a>.
-</tt>
-<table><tr><td><br></td><td width="1%">
-<a href="../api_c/c_index.html"><img src="../images/api.gif" alt="API"></a><a href="../ref/toc.html"><img src="../images/ref.gif" alt="Ref"></a>
-</td></tr></table>
-<p><font size=1><a href="http://www.sleepycat.com">Copyright Sleepycat Software</a></font>
-</body>
-</html>