Hibernate操作数据库的回调机制--Callback
1:一般情况下,在使用Hibernate Session存取数据库的代码中,基本上大部分是相同的,如下两个方法所示, //查询Teacher操作
1:一般情况下,在使用Hibernate Session存取数据库的代码中,基本上大部分是相同的,如下两个方法所示,
上面这两种方法的做法是不对的,大量重复的代码会导致后期维护困难,这里可以考虑把具体的业务逻辑处理部分剥离出来,而只对公共的Session获取及释放
和异常处理部分进行封装,形成一个公共的方法,如下面代码所示,
回调,就是由被调用者调用由调用者提供的对象实现具体的业务操作。回调机制一般与模板方法结合起来作为一种模式使用,回调机制让应用程序人员只关心业务逻辑实现,
而不用处理一些底层通用操作,从而可以实现通用操作和业务逻辑相分离。比如在Java数据库操作中,使用回调机制,不用关心数据库连接的打开和关闭,只需要在Callback实现相关的数据存取即可,,这样可以从一定程度上保证数据库连接总是被及时关闭。

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