数据库应用与开发都有专门成熟的工具，但是在利用层层接口去访问数据库时却往往影响了数据的访问、处理速度。
There are special tools for database applications and developing, which always lower the speed of data access and processing while accessing database with hierarchical interface.
这使执行数据库操作非常容易，并且与应用程序用什么语言开发无关。
This makes it easy to perform database operations, whatever language your application is developed in.
如果要开发的数据库应用程序必须与许多不同的数据库或JDBC驱动程序进行交互，那么数据库元数据是最有用的。
Database metadata is most useful if you're developing a database application that must interact with a number of different databases or JDBC drivers.
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