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<! "@(#)abort.so 10.9 (Sleepycat) 1/3/99">
<!Copyright 1997, 1998 by Sleepycat Software, Inc. All rights reserved.>
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<head>
<title>Berkeley DB: DbTxn::abort</title>
<meta name="description" content="Berkeley DB: An embedded database programmatic toolkit.">
<meta name="keywords" content="embedded,database,programmatic,toolkit,b+tree,btr
ee,hash,hashing,transaction,transactions,locking,logging,access method,access me
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<h1>DbTxn::abort</h1>
<hr size=1 noshade>
<tt>
<h3>
<pre>
#include <db_cxx.h>
<p>
int
DbTxn::abort();
</pre>
</h3>
<h1>Description</h1>
<p>
The DbTxn::abort method causes an abnormal termination of the transaction.
<p>
The log is played backwards and any necessary recovery operations are
initiated through the <b>recover</b> function specified to <a href="../../api_cxx/DbTxnMgr/open.html">DbTxnMgr::open</a>.
After recovery is completed, all locks held by the transaction are acquired
by the parent transaction in the case of a nested transaction or released
in the case of a non-nested transaction.
As is the case for <a href="../../api_cxx/DbTxn/commit.html">DbTxn::commit</a>, applications that require strict
two-phase locking should not explicitly release any locks.
<p>
In the case of nested transactions, aborting the parent transaction causes
all children of that transaction to be aborted.
<p>
The DbTxn::abort
method either returns <b>errno</b> or throws an exception that
encapsulates an <b>errno</b> on failure, and 0 on success.
<p>
<h1>Errors</h1>
If a fatal error occurs in Berkeley DB, the DbTxn::abort method may fail and either
return DB_RUNRECOVERY or throw an exception encapsulating DB_RUNRECOVERY,
at which point all subsequent database calls will also fail in the same
way. Methods marked as returning <b>errno</b> will, by default, throw
an exception that encapsulates the error information. The default error
behavior can be changed, see <a href="../../api_cxx/DbException/class.html">DbException</a>.
<p>
The DbTxn::abort
method may fail and throw an exception
for any of the errors specified for the following Berkeley DB and C library
functions:
DBenv->tx_recover,
abort(3),
fcntl(3),
fflush(3),
fprintf(3),
free(3),
getpid(3),
<a href="../../api_cxx/DbLockTab/vec.html">DbLockTab::vec</a>,
<a href="../../api_cxx/DbLog/get.html">DbLog::get</a>,
memset(3),
strerror(3),
vfprintf(3),
and
vsnprintf(3).
<p>
In addition, the DbTxn::abort
method may fail and throw an exception
or return <b>errno</b>
for the following conditions:
<dl compact>
<p><dt>EINVAL<dd>The transaction was already aborted.
</dl>
<p>
<h1>Class</h1>
<a href="../../api_cxx/DbTxn/class.html">DbTxn</a>
<p>
<h1>See Also</h1>
DbTxn::abort,
<a href="../../api_cxx/DbTxn/commit.html">DbTxn::commit</a>,
<a href="../../api_cxx/DbTxn/id.html">DbTxn::id</a>
and
<a href="../../api_cxx/DbTxn/prepare.html">DbTxn::prepare</a>.
</tt>
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