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<th colspan="3" align="center">DbEnv::dbremove()</th>
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<h2 class="title" style="clear: both"><a id="envdbremove"></a>DbEnv::dbremove()</h2>
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<pre class="programlisting">#include <db_cxx.h>
int
DbEnv::dbremove(DbTxn *txnid,
const char *file, const char *database, u_int32_t flags);</pre>
<p>
The <code class="methodname">DbEnv::dbremove()</code> method removes the database specified by the
<span class="bold"><strong>file</strong></span> and <span class="bold"><strong>database</strong></span> parameters. If no <span class="bold"><strong>database</strong></span> is specified, the underlying file
represented by <span class="bold"><strong>file</strong></span> is removed,
incidentally removing all of the databases it contained.
</p>
<p>
Applications should never remove databases with open
<a class="link" href="db.html" title="Chapter 2. The Db Handle">Db</a> handles, or in the case of
removing a file, when any database in the file has an open handle.
</p>
<p>
The <code class="methodname">DbEnv::dbremove()</code> <span>
<span>
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.
</span>
</span>
</p>
<p>
<code class="methodname">DbEnv::dbremove()</code> is affected by any database directory specified using the
<a class="xref" href="envset_data_dir.html" title="DbEnv::set_data_dir()">DbEnv::set_data_dir()</a>
method, or by setting the <code class="literal">set_data_dir</code> string in the environment's
<a href="../../programmer_reference/env_db_config.html#env_db_config.DB_CONFIG" class="olink">DB_CONFIG</a> file.
</p>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h3 class="title"><a id="id1663493"></a>Parameters</h3>
</div>
</div>
</div>
<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h4 class="title"><a id="id1663513"></a>database</h4>
</div>
</div>
</div>
<p>
The <span class="bold"><strong>database</strong></span> parameter is the
database to be removed.
</p>
</div>
<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h4 class="title"><a id="id1663497"></a>file</h4>
</div>
</div>
</div>
<p>
The <span class="bold"><strong>file</strong></span> parameter is the physical
file which contains the database(s) to be removed.
</p>
</div>
<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h4 class="title"><a id="id1663397"></a>txnid</h4>
</div>
</div>
</div>
<p>
If the operation is part of an application-specified transaction, the
<span class="bold"><strong>txnid</strong></span> parameter is a transaction
handle returned from
<a class="xref" href="txnbegin.html" title="DbEnv::txn_begin()">DbEnv::txn_begin()</a>; if the
operation is part of a Berkeley DB Concurrent Data Store group, the
<span class="bold"><strong>txnid</strong></span> parameter is a handle returned
from <a class="xref" href="envcdsgroup_begin.html" title="DbEnv::cdsgroup_begin()">DbEnv::cdsgroup_begin()</a>;
otherwise NULL. If no transaction handle is specified, but the
<code class="literal">DB_AUTO_COMMIT</code> flag is specified to either this method
or the environment handle, the operation will be implicitly transaction protected.
</p>
</div>
<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h4 class="title"><a id="id1663467"></a>flags</h4>
</div>
</div>
</div>
<p>
The <span class="bold"><strong>flags</strong></span> parameter must
be set to 0 or the following value:
</p>
<div class="itemizedlist">
<ul type="disc">
<li>
<p>
<code class="literal">DB_AUTO_COMMIT</code>
</p>
<p>
Enclose the <code class="classname">DbEnv::dbremove()</code>
call within a transaction. If the call succeeds,
changes made by the operation will be recoverable.
If the call fails, the operation will have made no
changes.
</p>
</li>
</ul>
</div>
</div>
</div>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h3 class="title"><a id="id1663699"></a>Environment Variables</h3>
</div>
</div>
</div>
<p>
The environment variable <code class="literal">DB_HOME</code> may be used as the path of
the database environment home.
</p>
</div>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h3 class="title"><a id="id1663714"></a>Errors</h3>
</div>
</div>
</div>
<p>
The <code class="methodname">DbEnv::dbremove()</code> <span>
<span>
method may fail and throw a <a class="link" href="dbexception.html" title="Chapter 6. The DbException Class">DbException</a>
exception, encapsulating one of the following non-zero errors, or return one
of the following non-zero errors:
</span>
</span>
</p>
<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h4 class="title"><a id="id1663517"></a><span>DbDeadlockException or </span>DB_LOCK_DEADLOCK</h4>
</div>
</div>
</div>
<p>
A transactional database environment operation was selected to resolve
a deadlock.
</p>
<p>
<a class="xref" href="dbdeadlock.html" title="DbDeadlockException">DbDeadlockException</a> is thrown if
your Berkeley DB API is configured to throw exceptions.
Otherwise, <code class="literal">DB_LOCK_DEADLOCK</code> is returned.
</p>
</div>
<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h4 class="title"><a id="id1663844"></a><span>DbLockNotGrantedException or </span>DB_LOCK_NOTGRANTED</h4>
</div>
</div>
</div>
<p>
A Berkeley DB Concurrent Data Store database environment configured
for lock timeouts was unable to grant a lock in the allowed time.
</p>
<p>
<a class="xref" href="dblocknotgranted.html" title="DbLockNotGrantedException">DbLockNotGrantedException</a> is thrown if
your Berkeley DB API is configured to throw exceptions.
Otherwise, <code class="literal">DB_LOCK_NOTGRANTED</code> is returned.
</p>
</div>
<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h4 class="title"><a id="id1663514"></a>EINVAL</h4>
</div>
</div>
</div>
<p>
If the method was called before <a class="xref" href="envopen.html" title="DbEnv::open()">DbEnv::open()</a>
was called; or if an invalid flag value or parameter was specified.
</p>
</div>
<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h4 class="title"><a id="id1663580"></a>ENOENT</h4>
</div>
</div>
</div>
<p>
The file or directory does not exist.
</p>
</div>
</div>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h3 class="title"><a id="id1663917"></a>Class</h3>
</div>
</div>
</div>
<p>
<a class="link" href="env.html" title="Chapter 5. The DbEnv Handle">DbEnv</a>
</p>
</div>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h3 class="title"><a id="id1663634"></a>See Also</h3>
</div>
</div>
</div>
<p>
<a class="xref" href="env.html#envlist" title="Database Environments and Related Methods">Database Environments and Related Methods</a>
</p>
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