The system has four layers, including application layer, data operation layer, data wrapping layer, and data source layer.
此原型分为四层，分别为应用层、数据操作层、数据包装层、数据源系统层。
JDBC 3.0 frees the developer from this concern because the data source layer is now responsible for caching prepared statements.
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。
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.
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。
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