Each DAO instance is responsible for one primary domain object or entity.
每个dao实例负责一个主要域对象或实体。
Each entity in the logical data model is assigned a primary key.
逻辑数据模型中的每个实体都被指定了一个主键。
Click the Employee entity, and select empno its primary key.
点击Employee实体，并选择empno作为它的主要关键字。
Find : Locate an entity by its primary identifier.
find：通过实体的主标识符查找实体。
An Entity class needs a primary key.
Entity类需要一个主键。
实体具有主键。
实体具有主键。
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