简易JSR 235 SDO 实现
SDO 2.1 具备以下features:
1) Dynamic Data API.
2)?Support for Static Data API.SDO supports code-generating interfaces for Data Objects.
3)?Complex Data Objects.
4)?Change Summary.
5)?Navigation through graphs of data.
6)?Metadata.
7)?Validation and Constraints.
8)?Relationship integrity.
9)?Complete metamodel and metadata API.
10)Data Access Service (DAS) specification.
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下图是SDO的应用场景
在有些情况下并不是所有的特性都是需要的，如果引用一个完整的实现，显得有点重
