... Class-defined 已定义类 Table per Class 每个类一张表 Single Table per Class Hierarchy 每个类层次结构一张表 ...
基于14个网页-相关网页
Table per class hierarchy 一张表 ; 单表继承
Single Table per Class Hierarchy 每个类层次结构一张表
Table per concrete class 每个具体类一张表
One Class per Table 每个类映射为一张表
Inheritance: Annotations — Single table, joined table, and table per class.
继承：标注——单个表、联合表和按类表。
For our second strategy (one table per class hierarchy), you'll have to define your integrity using check constraints.
对于第二个策略(每个类层次结构一个表)，您必须用检测约束定义您自己的完整性。
With this approach you create one table per class, the attributes of which are the OID and the attributes that are specific to that class.
使用这种方法，为每个类创建一张表，它的属性是 OID和特定于该类的属性。
应用推荐