Why does the commit or rollback of a transaction close the result set?
为何事务的提交或回滚关闭结果集？
If a problem occurs, we will call the rollback method on the transaction object.
如果出现了任何问题，我们将调用事务对象中的rollback方法。
True if the current transaction is marked for rollback, false otherwise.
如果当前事务被标记为回滚，返回true，否则为false。
Mark the current transaction for rollback.
将当前事务标记为回滚。
Mark the current transaction for rollback.
将当前事务标记为回滚。
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