当只需要对数据库进行一次查询或简单的更新时，让会话bean直接访问数据库是正确的选择。
When just a query or a simple update to a database is needed, a session bean directly accessing the database is the right choice.
对于该场景，假定用户保留所选择的默认集合，输入一个简单的查询字符串，然后单击Search按钮。
For this scenario, assume that the user leaves the default collection selected, enters a simple query string, and then clicks the Search button.
如果您的服务是对一个具有良好索引的数据库的简单查询，花费少于100毫秒的时间，那么您将看到这两个选择之间巨大的差异。
If your services are doing simple inquiries into a well-indexed database that take less than 100 milliseconds, then you will see a big difference between the two choices.
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