Instead, it requires the developer only to denote the attributes to be persisted and to identify the attribute to represent the object's unique identifier (or primary key).
相反，它只需要程序员将属性标记为持久性的，并识别出能代表对象唯一标识符(或者主键)的属性。
They use database-generated primary key values for the ID attribute.
它们为ID属性使用数据库生成的主键值。
We will include this Key as an attribute of AcmeMembership, mark it as a Primary Key, and specify the strategy the Google App Engine runtime will use to populate it automatically with unique values.
我们将会将该Key作为AcmeMembership的属性添加，并将其标记为一个主键，并指定GoogleAppEngine运行时的策略，它将会自动填充上唯一的值。
Therefore, you need to map the foreign key attribute in Employee to the Department's primary key.
因此您需要将Employee的外部关键字属性，与Department的主关键字映射上。
All Hibernator objects require a primary key. This is specified through the "id" attribute.
所有Hibernator对象都需要主键，通过“id”属性指定。
An entity's primary key is the attribute or set of attributes that distinguish one instance of the entity from another.
实体的主键是使该实体的一个实例区别于其他实例的一个或一组属性。
Make a separate table for each set of related attributes, and give each table a primary key. Each field contains at most one value from its attribute domain.
为每个相关属性的集合创建一个单独的表，并为每个表指定一个主键。每列最多包含一个来自其属性域的值。
The name attribute defines the foreign key on the table to which the Customer class is mapped, and the referenced column defines the primary key to which the table CustomerOrder is mapped.
名称属性在customer类映射到的表上定义外键，参考列定义Table CustomerOrder映射到的主键。
In normalization theory of relation database, finding candidate key and primary attribute is always a difficult problem.
在关系数据库规范化理论中，求解后选关键字和主属性一直是一个棘手的问题。
We use place name as the primary key word to build the relationships between the spatial database and attribute database or each attribute tables.
并将各地地名作为主关键字，以实现空间库与属性库以及各属性库之间的关联。
This model decomposes a nested relational schema into a set of atomic schemas, each of them constitutes of a primary key or a primary key plus a non-primary attribute.
此模型将复杂的嵌套关系模式分解为由主键或主键和一个非主属性构成的原子模式集合。
For an entity class, at least one member must have this attribute and should be mapped to the primary key or a unique key in the corresponding table or view.
对于实体类，必须至少有一个成员具有此特性，并应映射到相应表或视图中的主键或唯一键。
For an entity class, at least one member must have this attribute and should be mapped to the primary key or a unique key in the corresponding table or view.
对于实体类，必须至少有一个成员具有此特性，并应映射到相应表或视图中的主键或唯一键。
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