Richie

Sometimes at night when I look up at the stars, and see the whole sky just laid out there, don't you think I ain't remembering it all. I still got dreams like anybody else, and ever so often, I am thinking about how things might of been. And then, all of a sudden, I'm forty, fifty, sixty years old, you know?

2009年1月6日 #

JPA规范的主要内容

摘要： Entity Identity 实体标识一般采用单一值做为entity identity采用compsite primary key时，必须单独建立一个表示主键的类－primary key class主键类。这样在实体上compsite primary key就可以用一个属性（primary key class类型）表示持久化框架内部很多地方使用entity identity进行处理，因此prim... 阅读全文

posted @ 2009-01-06 23:18 riccc 阅读(13407) 评论(0) 推荐(0) 编辑

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