1、在命名上,entity的类名应该能体现出它所代表的表名。
2、在命名上,entity的属性名应该能体现出它所代表的字段名。
3、实体类一定实现java.io.Serializable接口。
4、表的关系一定要体现为实体关系。
5、在处理一对多的关系时,除特殊说明,保存的集合一律选Set
保存在Set中的实体类必须覆盖equals和hashcode方法。
equals方法的比较规则不要使用id,而要使用业务属性。
6、在设计关系属性的时候,处理提供set/get方法之外,也需
提供必要的关系维护方法。
7、不用多对多关系,将其拆分为两个一对多的关系。
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