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<title>Berkeley DB: Dbc::count</title>
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#include <db_cxx.h>
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Dbc::count(db_recno_t *countp, u_int32_t flags);
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<p>The Dbc::count method returns a count of the number of duplicate data
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items for the key to which the
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cursor refers, into the memory location to which <b>countp</b> refers.
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If the underlying database does not support duplicate data items, the
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call will still succeed and a count of 1 will be returned.
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<p>The <b>flags</b> parameter is currently unused, and must be set to 0.
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If the <b>cursor</b> argument is not yet initialized, the Dbc::count method either returns EINVAL or throws an exception that encapsulates EINVAL.
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Otherwise, the Dbc::count method either returns a non-zero error value or throws an exception that
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encapsulates a non-zero error value on failure, and returns 0 on success.
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<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.
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If a catastrophic error has occurred, the Dbc::count method may fail and
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either return <a href="../ref/program/errorret.html#DB_RUNRECOVERY">DB_RUNRECOVERY</a> or throw a
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<a href="../api_cxx/runrec_class.html">DbRunRecoveryException</a>,
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in which case all subsequent Berkeley DB calls will fail in the same way.
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<a href="../api_cxx/dbc_class.html">Dbc</a>
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<a href="../api_cxx/dbc_list.html">Database Cursors and Related Methods</a>
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