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<title>Berkeley DB: DbEnv::dbrename</title>
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<h1>DbEnv::dbrename</h1>
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<h3><pre>
#include <db_cxx.h>
<p>
int
DbEnv::dbrename(DbTxn *txnid, const char *file,
const char *database, const char *newname, u_int32_t flags);
</pre></h3>
<h1>Description</h1>
<p>The DbEnv::dbrename method renames the database specified by the
<b>file</b> and <b>database</b> arguments to <b>newname</b>. If no
<b>database</b> is specified, the underlying file represented by
<b>file</b> is renamed, incidentally renaming all databases that it
contained.
<p>Applications should not rename databases that are currently in use. If
an underlying file is being renamed and logging is currently enabled in
the database environment, no database in the file may be open when the
DbEnv::dbrename method is called. In particular, some architectures do
not permit renaming files with open handles. On these architectures,
attempts to rename databases that are currently in use by any thread of
control in the system will fail.
<p>If the operation is to be transaction-protected, the <b>txnid</b>
parameter is a transaction handle returned from <a href="../api_cxx/txn_begin.html">DbEnv::txn_begin</a>;
otherwise, NULL.
<p>The <b>flags</b> value must be set to 0 or
the following value:
<p><dl compact>
<p><dt><a name="DB_AUTO_COMMIT">DB_AUTO_COMMIT</a><dd>Enclose the DbEnv::dbrename 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.
</dl>
<p>The DbEnv::dbrename 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.
<h1>Environment Variables</h1>
<p><dl compact>
<p><dt>DB_HOME<dd>The
environment variable <b>DB_HOME</b> may be used as the path of the
database environment home.
<p>DbEnv::dbrename is affected by any database directory specified using the
<a href="../api_cxx/env_set_data_dir.html">DbEnv::set_data_dir</a> method, or by setting the "set_data_dir" string
in the environment's <b>DB_CONFIG</b> file.
</dl>
<h1>Errors</h1>
<p>The DbEnv::dbrename method may fail and throw an exception or return a non-zero error for the following conditions:
<p><dl compact>
<p><dt>EINVAL<dd>An invalid flag value or parameter was specified.
<p>A database in the file is currently open.
<p>Called before <a href="../api_cxx/env_open.html">DbEnv::open</a> was called.
</dl>
<p>If the file or directory does not exist, the DbEnv::dbrename method will
fail and
and either return ENOENT or
throw a FileNotFoundException exception.
<p>The DbEnv::dbrename 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.
If a catastrophic error has occurred, the DbEnv::dbrename method may fail and
either return <a href="../ref/program/errorret.html#DB_RUNRECOVERY">DB_RUNRECOVERY</a> or throw a
<a href="../api_cxx/runrec_class.html">DbRunRecoveryException</a>,
in which case all subsequent Berkeley DB calls will fail in the same way.
<h1>Class</h1>
<a href="../api_cxx/env_class.html">DbEnv</a>
<h1>See Also</h1>
<a href="../api_cxx/env_list.html">Database Environments and Related Methods</a>
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