<!--$Id: dbc_count.so,v 10.26 2006/10/24 13:26:50 bostic Exp $--> <!--Copyright (c) 1997,2007 Oracle. All rights reserved.--> <!--See the file LICENSE for redistribution information.--> <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,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,Java,C,C++"> </head> <body bgcolor=white> <table width="100%"><tr valign=top> <td> <h3>Dbc::count</h3> </td> <td align=right> <a href="../api_cxx/api_core.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> <hr size=1 noshade> <h3>Description: Dbc::count</h3> <p>The Dbc::count method returns a count of the number of data items for the key to which the cursor refers.</p> <p>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. </p> <h3>Parameters</h3> <dl compact> <dt><b>countp</b><dd>The <b>countp</b> parameter references memory into which the count of the number of duplicate data items is copied. <dt><b>flags</b><dd>The <b>flags</b> parameter is currently unused, and must be set to 0. </dl> <h3>Errors</h3> <p>The Dbc::count method may fail and throw <a href="../api_cxx/except_class.html">DbException</a>, encapsulating one of the following non-zero errors, or return one of the following non-zero errors:</p> <dl compact> <dt>DB_REP_HANDLE_DEAD<dd>The database handle has been invalidated because a replication election unrolled a committed transaction. <dt>DB_REP_LOCKOUT<dd>The operation was blocked by client/master synchronization. </dl> <dl compact> <dt>EINVAL<dd>If the cursor has not been initialized; or if an invalid flag value or parameter was specified. </dl> <hr size=1 noshade> <h3>Class</h3> <a href="../api_cxx/dbc_class.html">Dbc</a> <h3>See Also</h3> <a href="../api_cxx/dbc_list.html">Database Cursors and Related Methods</a> </tt> <table width="100%"><tr><td><br></td><td align=right> <a href="../api_cxx/api_core.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>Copyright (c) 1996,2007 Oracle. All rights reserved.</font> </body> </html>