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<title>Berkeley DB: Dbc::count</title>
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<h1>Dbc::count</h1>
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<h3><pre>
#include &lt;db_cxx.h&gt;
<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 to which the
cursor refers, into the memory location to which <b>countp</b> refers.
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.
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 a
<a href="../api_cxx/runrec_class.html">DbRunRecoveryException</a>,
in which case all subsequent Berkeley DB calls will fail in the same way.
<h1>Class</h1>
<a href="../api_cxx/dbc_class.html">Dbc</a>
<h1>See Also</h1>
<a href="../api_cxx/dbc_list.html">Database Cursors and Related Methods</a>
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