To force a lock timeout error, establish a first database connection and execute some SQL statements simulating a real transaction on the table employee.
为了促使一个锁定超时错误发生，我们首先建立一个数据库连接，并执行一些sql语句来模拟表employee上的真实事务。
SaaS application architectures which force you to make decisions that lock you into a particular technology stack will compromise the ability of a SaaS application to evolve and adapt.
强制您作出选择并使您锁定到某种特定的技术堆栈，这种SaaS应用程序架构将不利于SaaS应用程序的未来演变和适应能力。
Since pessimistic session locks can be removed as described above, the application that obtained the lock should always check to see if it is still in force before updating data.
如上所述，由于可以删除悲观会话锁，因此获得锁的应用程序始终需要在更新数据之前检测锁是否有效。
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