如果语句执行返回一个错误，过程将自动中断或回滚事务。

If statement execution returns an error, the procedure is automatically aborted or the transaction is rolled back.

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Transaction Control (TCL)语句帮助把语句组织为逻辑事务，以便能够提交或回滚它们。

Transaction Control (TCL) statements help in grouping statements into logical transactions so that they can be committed or rolled back.

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触发器和激发它的语句同被视为一个事务，可以从触发器内部回滚。

The trigger and the statement that fires it are treated as a single transaction, which can be rolled back from within the trigger.

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