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103 lines
5.2 KiB
HTML
<!--$Id: db_set_dup_compare.so,v 10.21 2000/10/26 15:20:40 bostic Exp $-->
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<!--Copyright 1997, 1998, 1999, 2000 by Sleepycat Software, Inc.-->
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<!--All rights reserved.-->
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<html>
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<head>
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<title>Berkeley DB: DB->set_dup_compare</title>
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<meta name="description" content="Berkeley DB: An embedded database programmatic toolkit.">
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<meta name="keywords" content="embedded,database,programmatic,toolkit,b+tree,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,java,C,C++">
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</head>
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<body bgcolor=white>
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<a name="2"><!--meow--></a>
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<table><tr valign=top>
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<td>
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<h1>DB->set_dup_compare</h1>
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</td>
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<td width="1%">
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<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>
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</td></tr></table>
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<hr size=1 noshade>
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<tt>
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<h3><pre>
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#include <db.h>
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<p>
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int
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DB->set_dup_compare(DB *db,
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int (*dup_compare_fcn)(DB *, const DBT *, const DBT *));
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</pre></h3>
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<h1>Description</h1>
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<p>Set the duplicate data item comparison function. The comparison function
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is called when it is necessary to compare a data item specified by the
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application with a data item currently stored in the tree. The first
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argument to the comparison function is the <a href="../api_c/dbt.html">DBT</a> representing the
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application's data item, the second is the current tree's data item.
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<p>The comparison function must return an integer value less than, equal
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to, or greater than zero if the first data item argument is considered
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to be respectively less than, equal to, or greater than the second data
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item argument. In addition, the comparison function must cause the data
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items in the set to be <i>well-ordered</i>. The comparison function
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must correctly handle any data item values used by the application
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(possibly including zero-length data items). The <b>data</b> and
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<b>size</b> fields of the <a href="../api_c/dbt.html">DBT</a> are the only fields that may be
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used for the purposes of this comparison.
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<p>If no comparison function is specified, the data items are compared
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lexically, with shorter data items collating before longer data items.
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The same duplicate data item comparison method must be used each time
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a particular Btree is opened.
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<p>The DB->set_dup_compare interface may only be used to configure Berkeley DB before
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the <a href="../api_c/db_open.html">DB->open</a> interface is called.
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<p>The DB->set_dup_compare function returns a non-zero error value on failure and 0 on success.
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<h1>Errors</h1>
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<p><dl compact>
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<p><dt>EINVAL<dd>An invalid flag value or parameter was specified.
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</dl>
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<h1>See Also</h1>
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<a href="../api_c/db_create.html">db_create</a>,
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<a href="../api_c/db_close.html">DB->close</a>,
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<a href="../api_c/db_cursor.html">DB->cursor</a>,
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<a href="../api_c/db_del.html">DB->del</a>,
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<a href="../api_c/db_err.html">DB->err</a>,
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<a href="../api_c/db_fd.html">DB->fd</a>,
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<a href="../api_c/db_get.html">DB->get</a>,
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<a href="../api_c/db_get_byteswapped.html">DB->get_byteswapped</a>,
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<a href="../api_c/db_get_type.html">DB->get_type</a>,
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<a href="../api_c/db_join.html">DB->join</a>,
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<a href="../api_c/db_key_range.html">DB->key_range</a>,
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<a href="../api_c/db_open.html">DB->open</a>,
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<a href="../api_c/db_put.html">DB->put</a>,
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<a href="../api_c/db_remove.html">DB->remove</a>,
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<a href="../api_c/db_set_bt_compare.html">DB->set_bt_compare</a>,
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<a href="../api_c/db_set_bt_minkey.html">DB->set_bt_minkey</a>,
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<a href="../api_c/db_set_bt_prefix.html">DB->set_bt_prefix</a>,
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<a href="../api_c/db_set_cachesize.html">DB->set_cachesize</a>,
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<a href="../api_c/db_set_dup_compare.html">DB->set_dup_compare</a>,
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<a href="../api_c/db_set_errcall.html">DB->set_errcall</a>,
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<a href="../api_c/db_set_errfile.html">DB->set_errfile</a>,
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<a href="../api_c/db_set_errpfx.html">DB->set_errpfx</a>,
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<a href="../api_c/db_set_flags.html">DB->set_flags</a>,
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<a href="../api_c/db_set_h_ffactor.html">DB->set_h_ffactor</a>,
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<a href="../api_c/db_set_h_hash.html">DB->set_h_hash</a>,
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<a href="../api_c/db_set_h_nelem.html">DB->set_h_nelem</a>,
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<a href="../api_c/db_set_lorder.html">DB->set_lorder</a>,
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<a href="../api_c/db_set_malloc.html">DB->set_malloc</a>,
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<a href="../api_c/db_set_pagesize.html">DB->set_pagesize</a>,
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<a href="../api_c/db_set_paniccall.html">DB->set_paniccall</a>,
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<a href="../api_c/db_set_q_extentsize.html">DB->set_q_extentsize</a>,
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<a href="../api_c/db_set_realloc.html">DB->set_realloc</a>,
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<a href="../api_c/db_set_re_delim.html">DB->set_re_delim</a>,
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<a href="../api_c/db_set_re_len.html">DB->set_re_len</a>,
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<a href="../api_c/db_set_re_pad.html">DB->set_re_pad</a>,
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<a href="../api_c/db_set_re_source.html">DB->set_re_source</a>,
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<a href="../api_c/db_stat.html">DB->stat</a>,
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<a href="../api_c/db_sync.html">DB->sync</a>,
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<a href="../api_c/db_upgrade.html">DB->upgrade</a>
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and
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<a href="../api_c/db_verify.html">DB->verify</a>.
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</tt>
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<table><tr><td><br></td><td width="1%">
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<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>
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</td></tr></table>
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<p><font size=1><a href="http://www.sleepycat.com">Copyright Sleepycat Software</a></font>
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