Berkeley DB: DbTxn::abort
Полезная информация

DbTxn::abort


#include <db_cxx.h>

int DbTxn::abort();

Description

The DbTxn::abort method causes an abnormal termination of the transaction.

The log is played backwards and any necessary recovery operations are initiated through the recover function specified to DbTxnMgr::open. 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 DbTxn::commit, applications that require strict two-phase locking should not explicitly release any locks.

In the case of nested transactions, aborting the parent transaction causes all children of that transaction to be aborted.

The DbTxn::abort method either returns errno or throws an exception that encapsulates an errno on failure, and 0 on success.

Errors

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 errno will, by default, throw an exception that encapsulates the error information. The default error behavior can be changed, see DbException.

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), DbLockTab::vec, DbLog::get, memset(3), strerror(3), vfprintf(3), and vsnprintf(3).

In addition, the DbTxn::abort method may fail and throw an exception or return errno for the following conditions:

EINVAL
The transaction was already aborted.

Class

DbTxn

See Also

DbTxn::abort, DbTxn::commit, DbTxn::id and DbTxn::prepare.