业务层由业务 Bean 和 iBATIS 容器框架组成， 主 持久层 （Persistence Layer）是负责对象持久化也就 要是完成系统业务功能。具体实现功能的都是 DAO。
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It's been estimated that 75-80% of the SpecJEnterprise benchmark depends on the persistence layer (that is, JPA provider).
据估计，75 - 80%的SpecJEnterprise基准测试依赖持久化层(即jpa提供者)。
I hope you come away with the following point: NHibernate will dramatically simplify the persistence layer of your application.
NHibernate将会大大简化你程序中的持久化代码层，我希望你可以带着这个观点离开。
And there is another important layer missing from the stack, the persistence layer, and Grey Lens Man is still looking for a solution.
JOSH组合还缺了很重要的一层，持久化层的方案灰镜人尚在寻找当中。
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