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73 lines
3.3 KiB
HTML
<!--$Id: dbc_del.so,v 10.23 2000/05/22 20:51:46 bostic Exp $-->
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<!--Copyright 1997, 1998, 1999, 2000 by Sleepycat Software, Inc.-->
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<!--All rights reserved.-->
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<html>
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<head>
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<title>Berkeley DB: Dbc::del</title>
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<meta name="description" content="Berkeley DB: An embedded database programmatic toolkit.">
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<meta name="keywords" content="embedded,database,programmatic,toolkit,b+tree,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,java,C,C++">
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</head>
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<body bgcolor=white>
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<a name="2"><!--meow--></a>
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<table><tr valign=top>
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<td>
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<h1>Dbc::del</h1>
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</td>
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<td width="1%">
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<a href="../api_cxx/cxx_index.html"><img src="../images/api.gif" alt="API"></a><a href="../ref/toc.html"><img src="../images/ref.gif" alt="Ref"></a>
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</td></tr></table>
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<hr size=1 noshade>
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<tt>
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<h3><pre>
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#include <db_cxx.h>
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<p>
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int
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Dbc::del(u_int32_t flags);
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</pre></h3>
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<h1>Description</h1>
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<p>The Dbc::del method deletes the key/data pair currently referenced by
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the cursor.
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<p>The <b>flags</b> parameter is currently unused, and must be set to 0.
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<p>The cursor position is unchanged after a delete, and subsequent calls to
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cursor functions expecting the cursor to reference an existing key will
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fail.
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<p>If the element has already been deleted, Dbc::del will return
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<a href="../ref/program/errorret.html#DB_KEYEMPTY">DB_KEYEMPTY</a>.
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<p>If the cursor is not yet initialized, the Dbc::del method either returns EINVAL or throws an exception that encapsulates EINVAL.
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<p>Otherwise, the Dbc::del 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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<h1>Errors</h1>
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<p>The Dbc::del method may fail and throw an exception or return a non-zero error for the following conditions:
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<p><dl compact>
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<p><dt>DB_LOCK_DEADLOCK<dd>The operation was selected to resolve a deadlock.
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</dl>
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<p><dl compact>
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<p><dt>EINVAL<dd>An invalid flag value or parameter was specified.
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</dl>
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<p><dl compact>
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<p><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
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specified to <a href="../api_cxx/env_open.html">DbEnv::open</a>.
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</dl>
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<p>The Dbc::del 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::del method may fail and either
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return <a href="../ref/program/errorret.html#DB_RUNRECOVERY">DB_RUNRECOVERY</a> or throw an exception encapsulating
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<a href="../ref/program/errorret.html#DB_RUNRECOVERY">DB_RUNRECOVERY</a>, in which case all subsequent Berkeley DB calls will fail
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in the same way.
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<h3>Class</h3>
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<a href="../api_cxx/dbc_class.html">Dbc</a>
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<h1>See Also</h1>
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<a href="../api_cxx/dbc_close.html">Dbc::close</a>,
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<a href="../api_cxx/dbc_count.html">Dbc::count</a>,
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<a href="../api_cxx/dbc_del.html">Dbc::del</a>,
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<a href="../api_cxx/dbc_dup.html">Dbc::dup</a>,
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<a href="../api_cxx/dbc_get.html">Dbc::get</a>
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and
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<a href="../api_cxx/dbc_put.html">Dbc::put</a>.
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</tt>
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<table><tr><td><br></td><td width="1%">
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<a href="../api_cxx/cxx_index.html"><img src="../images/api.gif" alt="API"></a><a href="../ref/toc.html"><img src="../images/ref.gif" alt="Ref"></a>
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</td></tr></table>
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<p><font size=1><a href="http://www.sleepycat.com">Copyright Sleepycat Software</a></font>
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</body>
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</html>
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