另外，系统功能上分成三个层次结构，即表示层、业务逻辑层和数据源层。
In addition, the whole system is divided into 3-tier in functionality, representation level, business logic level and data level respectively.
JDBC 3.0让开发人员不再为此担心，因为数据源层现在负责为预备语句进行缓存。
JDBC 3.0 frees the developer from this concern because the data source layer is now responsible for caching prepared statements.
数据源层(Data Source Layer)提供了数据或原始资料(包括公司内部和外部的)，这些数据或原始资料将成为分析和知识的基础。
The data Source Layer provides the data or raw materials (both internal and external to the organization) that will be the foundation for analysis and knowledge.
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