JavaPersistenceWithHibernate第二版笔记-第六章-Mapping inheritance-004Table per class hierarchy(@Inheritance..SINGLE_TABLE)、@DiscriminatorColumn、@DiscriminatorValue、@DiscriminatorFormula) 一、结构 You can map an entire class hierarchy to a single table. This table includes columnsfor all properties of al...
1 package org.jpwh.model.inheritance.mappedsuperclass; 2 3 import javax.persistence.MappedSuperclass; 4 import javax.validation.constraints.NotNull; 5 6 @MappedSuperclass 7 public abstract class BillingDetails { 8 9 @NotNull 10 protected String owner; 11 12 // ... 13 14 protected BillingDet...
对于Table Per Concrete类,每个类都创建表。因此表中没有可为空的值。这种方法的缺点是在子类表中创建了重复的列。 在这里,我们需要在父类中使用@Inheritance(strategy = InheritanceType.TABLE_PER_CLASS)注释,在子类中使用@AttributeOverrides注释。 @Inheritance(strategy = InheritanceType.TABLE_PER_CLASS) 指定我们...
在JPA中使用映射注解Inheritance,有三种策略属性 SINGLE_TABLE – 将所有父类和子类集合在一张表 TABLE_PER_CLASS – 每个子类会生成一张单独的表,父类可以查询所有子类的表数据,参考上一篇笔记Union查询 JOINED – 每个类分别生成一张单独的表,但是每张表只有自己的属性,没有父类的属性,通过外键关联的形式使两张...
hibernate 继承映射关系( TABLE_PER_CLASS) Person,Student,Teacher各创建一个表,主键用一个中间表生成。 package com.bjsxt.hibernate; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.GenerationType; import ;...
DB First Inheritance Mapping - Table Per Type I am an SQL developer by experience working with entity framework 5 and MVC 4 (C#) for the first time, having trouble finding an answer to an inheritance mapping solution I need. The application I am developing has a base class of Person with...
The following steps summarize how to implement table-per-type inheritance in this case (the procedures later in this topic provide more detail): Delete the association between the OnlineCourse entity type and the Course entity type. Delete the association between the OnsiteCourse entity type and ...
_ LastName + ", " + Instructor.FirstName) Next End Sub End Class Next Steps You have successfully implemented table-per-hierarchy inheritance in a conceptual model. For more information about how to define a conceptual model with table-per-hierarchy inheritance, see How to: Define a Model ...
网络表的结构设计 网络释义 1. 表的结构设计 ...的常见。在这个例子中,我将给大家展示通过NHibernate去映射继承类型的一种方法,称为所有类型使用一张表的结构设计(t… www.cyqdata.com|基于4个网页 例句 释义: 全部,表的结构设计
The Entity Framework offers very rich inheritance mapping schemes for building your conceptual model. The inheritance capabilities in EF include: · TPH (Table per Hierarchy): This is the inheritance scheme where there is a single table in the database represen...