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<!--$Id: dbc_del.so,v 10.44 2004/08/13 03:38:56 bostic Exp $-->
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<title>Berkeley DB: Dbc::del</title>
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<h3>Dbc::del</h3>
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<tt>
<h3><pre>
#include <db_cxx.h>
<p>
int
Dbc::del(u_int32_t flags);
</pre></h3>
<hr size=1 noshade>
<h3>Description: Dbc::del</h3>
<p>The Dbc::del method deletes the key/data pair to which the cursor
refers.</p>
<p>When called on a cursor opened on a database that has been made into a
secondary index using the <a href="../api_cxx/db_associate.html">Db::associate</a> method, the <a href="../api_cxx/db_del.html">Db::del</a> method
deletes the key/data pair from the primary database and all secondary
indices.</p>
<p>The cursor position is unchanged after a delete, and subsequent calls to
cursor functions expecting the cursor to refer to an existing key will
fail.</p>
<p>The Dbc::del method will return <a href="../ref/program/errorret.html#DB_KEYEMPTY">DB_KEYEMPTY</a> if the element has already been deleted.
Unless otherwise specified, the Dbc::del 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>flags</b><dd>The <b>flags</b> parameter is currently unused, and must be set to 0.
</dl>
<h3>Errors</h3>
<p>The Dbc::del 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.
</dl>
<dl compact>
<dt>DB_SECONDARY_BAD<dd>A secondary index references a nonexistent primary key.
</dl>
<dl compact>
<dt>EACCES<dd>An attempt was made to modify a read-only database.
</dl>
<dl compact>
<dt>EINVAL<dd>If the cursor has not been initialized; or if an
invalid flag value or parameter was specified.
</dl>
<dl compact>
<dt>EPERM <dd>Write attempted on read-only cursor when the <a href="../api_cxx/env_open.html#DB_INIT_CDB">DB_INIT_CDB</a> flag was
specified to <a href="../api_cxx/env_open.html">DbEnv::open</a>.
</dl>
<p>If a transactional database environment operation was selected to
resolve a deadlock, the Dbc::del method will fail and
either return <a href="../ref/program/errorret.html#DB_LOCK_DEADLOCK">DB_LOCK_DEADLOCK</a> or
throw a <a href="../api_cxx/deadlock_class.html">DbDeadlockException</a> exception.</p>
<p>If a Berkeley DB Concurrent Data Store database environment configured for lock timeouts was unable
to grant a lock in the allowed time, the Dbc::del method will fail and
either return <a href="../ref/program/errorret.html#DB_LOCK_NOTGRANTED">DB_LOCK_NOTGRANTED</a> or
throw a <a href="../api_cxx/lockng_class.html">DbLockNotGrantedException</a> exception.</p>
<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>
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