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<b>DB-&gt;del</b>
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<tt>
<b><pre>
#include &lt;db.h&gt;
<p>
int
DB-&gt;del(DB *db, DB_TXN *txnid, DBT *key, u_int32_t flags);
</pre></b>
<hr size=1 noshade>
<b>Description: DB-&gt;del</b>
<p>The DB-&gt;del method removes key/data pairs from the database.  The
key/data pair associated with the specified <b>key</b> is discarded from
the database.  In the presence of duplicate key values, all records
associated with the designated key will be discarded.</p>
<p>When called on a database that has been made into a secondary index
using the <a href="../../db4-devel-4.7.25/api_c/db_associate.html">DB-&gt;associate</a> method, the DB-&gt;del method deletes the
key/data pair from the primary database and all secondary indices.</p>
<p>The DB-&gt;del method will return <a href="../../db4-devel-4.7.25/ref/program/errorret.html#DB_NOTFOUND">DB_NOTFOUND</a> if the specified key is not in the database.
The DB-&gt;del method will return <a href="../../db4-devel-4.7.25/ref/program/errorret.html#DB_KEYEMPTY">DB_KEYEMPTY</a> if the database is a Queue or Recno database and
the specified key exists, but was never explicitly created by the
application or was later deleted.
Unless otherwise specified, the DB-&gt;del method
returns a non-zero error value on failure
and 0 on success.
</p>
<b>Parameters</b> <br>
 <b>flags</b><ul compact><li>The <b>flags</b> parameter is currently unused, and must be set to 0.</ul>
 <b>key</b><ul compact><li>The key <a href="../../db4-devel-4.7.25/api_c/dbt_class.html">DBT</a> operated on.</ul>
 <b>txnid</b><ul compact><li>If the operation is part of an application-specified transaction, the
<b>txnid</b> parameter is a transaction handle returned from
<a href="../../db4-devel-4.7.25/api_c/txn_begin.html">DB_ENV-&gt;txn_begin</a>; if the operation is part of a Berkeley DB Concurrent Data Store group, the
<b>txnid</b> parameter is a handle returned from
<a href="../../db4-devel-4.7.25/api_c/env_cdsgroup_begin.html">DB_ENV-&gt;cdsgroup_begin</a>; otherwise NULL.
If no transaction handle is
specified, but the
operation occurs in a transactional
database,
the operation will be implicitly transaction protected.
</ul>
<br>
<br><b>Errors</b>
<p>The DB-&gt;del method
may fail and return one of the following non-zero errors:</p>
<br>
<b>DB_LOCK_DEADLOCK</b><ul compact><li>A transactional database environment operation was selected to resolve
a deadlock.</ul>
<b>DB_LOCK_NOTGRANTED</b><ul compact><li>A Berkeley DB Concurrent Data Store database environment configured for lock timeouts was unable
to grant a lock in the allowed time.</ul>
<br>
<br>
<b>DB_REP_HANDLE_DEAD</b><ul compact><li>The database handle has been invalidated because a replication election
unrolled a committed transaction.</ul>
<br>
<br>
<b>DB_REP_LOCKOUT</b><ul compact><li>The operation was blocked by client/master synchronization.</ul>
<br>
<br>
<b>DB_SECONDARY_BAD</b><ul compact><li>A secondary index references a nonexistent primary key.</ul>
<br>
<br>
<b>EACCES</b><ul compact><li>An attempt was made to modify a read-only database.</ul>
<br>
<br>
<b>EINVAL</b><ul compact><li>An
invalid flag value or parameter was specified.</ul>
<br>
<hr size=1 noshade>
<br><b>Class</b>
<a href="../../db4-devel-4.7.25/api_c/db_class.html">DB</a>
<br><b>See Also</b>
<a href="../../db4-devel-4.7.25/api_c/db_list.html">Databases and Related Methods</a>
</tt>
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