<!--$Id: dbc_count.so,v 10.4 2000/03/01 21:41:29 bostic Exp $--> <!--Copyright 1997, 1998, 1999, 2000 by Sleepycat Software, Inc.--> <!--All rights reserved.--> <html> <head> <title>Berkeley DB: Dbc::count</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>Dbc::count</h1> </td> <td width="1%"> <a href="../api_cxx/cxx_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 <db_cxx.h> <p> int Dbc::count(db_recno_t *countp, u_int32_t flags); </pre></h3> <h1>Description</h1> <p>The Dbc::count method returns a count of the number of duplicate data items for the key referenced by the cursor into the memory location referenced by <b>countp</b>. If the underlying database does not support duplicate data items the call will still succeed and a count of 1 will be returned. <p>The <b>flags</b> parameter is currently unused, and must be set to 0. <p>If the <b>cursor</b> argument is not yet initialized, the Dbc::count method either returns EINVAL or throws an exception that encapsulates EINVAL. <p>Otherwise, the Dbc::count method either returns a non-zero error value or throws an exception that encapsulates a non-zero error value on failure, and returns 0 on success. <h1>Errors</h1> <p>The Dbc::count method may fail and throw an exception or return a non-zero error for errors specified for other Berkeley DB and C library or system methods. If a catastrophic error has occurred, the Dbc::count method may fail and either return <a href="../ref/program/errorret.html#DB_RUNRECOVERY">DB_RUNRECOVERY</a> or throw an exception encapsulating <a href="../ref/program/errorret.html#DB_RUNRECOVERY">DB_RUNRECOVERY</a>, in which case all subsequent Berkeley DB calls will fail in the same way. <h3>Class</h3> <a href="../api_cxx/dbc_class.html">Dbc</a> <h1>See Also</h1> <a href="../api_cxx/dbc_close.html">Dbc::close</a>, <a href="../api_cxx/dbc_count.html">Dbc::count</a>, <a href="../api_cxx/dbc_del.html">Dbc::del</a>, <a href="../api_cxx/dbc_dup.html">Dbc::dup</a>, <a href="../api_cxx/dbc_get.html">Dbc::get</a> and <a href="../api_cxx/dbc_put.html">Dbc::put</a>. </tt> <table><tr><td><br></td><td width="1%"> <a href="../api_cxx/cxx_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>