DbTxn::commit |
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#include <db_cxx.h>int DbTxn::commit(u_int32_t flags);
The DbTxn::commit method ends the transaction. In the case of nested transactions, if the transaction is a child transaction, its locks are not released, but are acquired by its parent. While the commit of the child transaction will succeed, the actual resolution of the child transaction is postponed until the parent transaction is committed or aborted, i.e., if its parent transaction commits, it will be committed, and if its parent transaction aborts, it will be aborted.
In the case of nested transactions, if the transaction is a parent transaction with unresolved (neither committed or aborted) child transactions, DbTxn::commit will fail, either returning DB_UNRESOLVED_CHILD or throwing an exception that encapsulates DB_UNRESOLVED_CHILD. In this case, the child transactions should be resolved, then the parent may be resolved.
The flags parameter must be set to 0 or one of the following values:
This behavior may be set for an entire Berkeley DB environment as part of the DbEnv::set_flags interface.
This behavior is the default for Berkeley DB environments unless the DB_TXN_NOSYNC flag was specified to the DbEnv::set_flags or DbEnv::txn_begin interfaces.
Once the DbTxn::commit method returns, other than under the conditions described for unresolved child transactions, the DbTxn handle may not be accessed again. If DbTxn::commit encounters any error other than unresolved child transactions, then the transaction and all child transactions of this transaction are aborted.
The DbTxn::commit 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.
The DbTxn::commit 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 DbTxn::commit method may fail and either return DB_RUNRECOVERY or throw an exception encapsulating DB_RUNRECOVERY, in which case all subsequent Berkeley DB calls will fail in the same way.
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