取出数据的代码与此类似，见清单3。
The code for popping data out is similar, as Listing 3 shows.
为了将数据输入服务或者从服务取出数据，输入和输出是必须的。
To get data into and out of the service, an input and an output are required.
您需要给出一个JDBC的数据源，从中可以提取出数据库模式的信息。
You give it a JDBC source from which it can extract database schema information.
应用推荐