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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break语句的一个特殊特性是，它完全中断循环，并跳转到循环下面的任一个else子句。

One special feature of the break statement is that it breaks completely out of the loop, thereby skipping any else clause that follows the loop.

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此时，break语句导致程序执行中断while循环，跳转到else子句。

At this point, the break statement causes program execution to break out of the while loop, skipping the else clause.

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