在该模式下，无论客户机实际上能否连接到服务器数据存储，客户机始终与本地数据库的数据进行交互。
In this pattern, the client always interacts with data from a local database regardless of whether or not the client can physically connect to the server data store.
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.
人与数据库交互：他们引导数据流的走向；他们解释并处理数据请求。
People interact with databases: they direct data flows; they interpret and service data requests.
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