1<!--$Id: dbc_count.so,v 10.27 2007/10/24 16:06:07 bostic Exp $--> 2<!--Copyright (c) 1997,2008 Oracle. All rights reserved.--> 3<!--See the file LICENSE for redistribution information.--> 4<html> 5<head> 6<title>Berkeley DB: Dbc::count</title> 7<meta name="description" content="Berkeley DB: An embedded database programmatic toolkit."> 8<meta name="keywords" content="embedded,database,programmatic,toolkit,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,Java,C,C++"> 9</head> 10<body bgcolor=white> 11<table width="100%"><tr valign=top> 12<td> 13<b>Dbc::count</b> 14</td> 15<td align=right> 16<a href="../api_cxx/api_core.html"><img src="../images/api.gif" alt="API"></a> 17<a href="../ref/toc.html"><img src="../images/ref.gif" alt="Ref"></a></td> 18</tr></table> 19<hr size=1 noshade> 20<tt> 21<b><pre> 22#include <db_cxx.h> 23<p> 24int 25Dbc::count(db_recno_t *countp, u_int32_t flags); 26</pre></b> 27<hr size=1 noshade> 28<b>Description: Dbc::count</b> 29<p>The Dbc::count method returns a count of the number of data items for 30the key to which the cursor refers.</p> 31<p>The Dbc::count method 32either returns a non-zero error value 33or throws an exception that encapsulates a non-zero error value on 34failure, and returns 0 on success. 35</p> 36<b>Parameters</b> <br> 37 <b>countp</b><ul compact><li>The <b>countp</b> parameter references memory into which 38 the count of the number of duplicate data items is copied.</ul> 39 <b>flags</b><ul compact><li>The <b>flags</b> parameter is currently unused, and must be set to 0.</ul> 40<br> 41<br><b>Errors</b> 42<p>The Dbc::count method 43may fail and throw 44<a href="../api_cxx/except_class.html">DbException</a>, 45encapsulating one of the following non-zero errors, or return one of 46the following non-zero errors:</p> 47<br> 48<b>DB_REP_HANDLE_DEAD</b><ul compact><li>The database handle has been invalidated because a replication election 49unrolled a committed transaction.</ul> 50<br> 51<br> 52<b>DB_REP_LOCKOUT</b><ul compact><li>The operation was blocked by client/master synchronization.</ul> 53<br> 54<br> 55<b>EINVAL</b><ul compact><li>If the cursor has not been initialized; or if an 56invalid flag value or parameter was specified.</ul> 57<br> 58<hr size=1 noshade> 59<br><b>Class</b> 60<a href="../api_cxx/dbc_class.html">Dbc</a> 61<br><b>See Also</b> 62<a href="../api_cxx/dbc_list.html">Database Cursors and Related Methods</a> 63</tt> 64<table width="100%"><tr><td><br></td><td align=right> 65<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> 66</td></tr></table> 67<p><font size=1>Copyright (c) 1996,2008 Oracle. All rights reserved.</font> 68</body> 69</html> 70