There are four different strategies for representing an inheritance hierarchy:
 Use one table per concrete class and default runtime polymorphic behavior.
 Use one table per concrete class but discard polymorphism and inheritance relationships completely from the SQL schema. Use SQL UNION queries for runtime polymorphic behavior.

 Use one table per class hierarchy: enable polymorphism by denormalizing the SQL schema and relying on row-based discrimination to determine super/subtypes.
 Use one table per subclass: represent is a (inheritance) relationships as has a (foreign key) relationships, and use SQL JOIN operations.

JavaPersistenceWithHibernate第二版笔记-第六章-Mapping inheritance-001Hibernate映射继承的方法的更多相关文章

  1. JavaPersistenceWithHibernate第二版笔记-第六章-Mapping inheritance-003Table per concrete class with unions(@Inheritance(strategy = InheritanceType.TABLE_PER_CLASS)、<union-subclass>)

    一.代码 1. package org.jpwh.model.inheritance.tableperclass; import org.jpwh.model.Constants; import ja ...

  2. JavaPersistenceWithHibernate第二版笔记-第六章-Mapping inheritance-002Table per concrete class with implicit polymorphism(@MappedSuperclass、@AttributeOverride)

    一.结构 二.代码 1. package org.jpwh.model.inheritance.mappedsuperclass; import javax.persistence.MappedSup ...

  3. JavaPersistenceWithHibernate第二版笔记-第六章-Mapping inheritance-006Mixing inheritance strategies(@SecondaryTable、@PrimaryKeyJoinColumn、<join fetch="select">)

    一.结构 For example, you can map a class hierarchy to a single table, but, for a particular subclass, s ...

  4. JavaPersistenceWithHibernate第二版笔记-第六章-Mapping inheritance-005Table per subclass with joins(@Inheritance(strategy = InheritanceType.JOINED)、@PrimaryKeyJoinColumn、)

    一.结构 The fourth option is to represent inheritance relationships as SQL foreign key associations. Ev ...

  5. 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 columns for all pr ...

  6. JavaPersistenceWithHibernate第二版笔记-第六章-Mapping inheritance-009Polymorphic collections(@OneToMany(mappedBy = "user")、@ManyToOne、)

    一.代码 1. package org.jpwh.model.inheritance.associations.onetomany; import org.jpwh.model.Constants; ...

  7. JavaPersistenceWithHibernate第二版笔记-第六章-Mapping inheritance-008Polymorphic many-to-one associations(@ManyToOne、@Inheritance、)

    一.结构 二.代码 1. package org.jpwh.model.inheritance.associations.manytoone; import org.jpwh.model.Consta ...

  8. JavaPersistenceWithHibernate第二版笔记-第六章-Mapping inheritance-007Inheritance of embeddable classes(@MappedSuperclass、@Embeddable、@AttributeOverrides、、)

    一.结构 二.代码 1. package org.jpwh.model.inheritance.embeddable; import javax.persistence.MappedSuperclas ...

  9. JavaPersistenceWithHibernate第二版笔记-第四章-Mapping persistent classes-003映射实体时的可选操作(<delimited-identifiers/>、PhysicalNamingStrategy、PhysicalNamingStrategyStandardImpl、、、)

    一.自定义映射的表名 1. @Entity @Table(name = "USERS") public class User implements Serializable { / ...

随机推荐

  1. Java实现Socket之WhoisClient

    Java实现Socket之WhoisClient 代码内容 从常用的whois服务器的43号端口得到对应域名的所有注册信息并显示出来 代码实现 /* WhoisClient.java */ impor ...

  2. C Primer Plus学习笔记(二)

    1. C的左值用是指用于标志一个特定的数据对象的名字或表达式.“数据对象”是泛指数据存储的术语. 赋值运算符的左边应该是以个可以修改的左值. 右值是指可赋给可修gia的左值的量.右值可以是常量.变量或 ...

  3. VS2010出现灾难性错误的解决办法

    VS2010出现灾难性错误的解决办法   之前本人利用VS2010 在编写一个基于对话框的程序的时候,要在对话框类C-.DLG中添加函数,右键点击类向导,此时界面上弹出一个消息框,告知出现灾难性事故, ...

  4. java数组元素的输出

    java数组元素的输出 利用Arrays.toString(数组名即可) String[] name = {"Tom", "John", "Nike& ...

  5. Material

    renderer.material  物理材质 实现二维图上的人物动作 新建Material,选择Shader(著色器)为transparent/diffuse(背景透明),将上图拉到背景图选项中. ...

  6. 拓展Jquery对象，实现Post提交并跳转

    $.extend({ StandardPost:function(url,args){ var body = $(document.body), form = $("<form met ...

  7. android开发 textview根据字数长度自动调整字体大小

    需求:根据输入的值实时显示到textview中预览,但是字体大小是要自动适配的 网上有一个代码,但是在我这里不能用,注意方法:refitText  注释掉的是之前的代码 import com.cars ...

  8. 【Permutations】cpp

    题目: Given a collection of numbers, return all possible permutations. For example,[1,2,3] have the fo ...

  9. ffmpeg 命令

    1.保存文件: ffmpeg -i rtsp://admin:12345@172.29.61.108/Streaming/Channels/1 -vcodec copy -acodec libvo_a ...

  10. 【VS2012】项目文件夹管理

    项目中添加文件夹 " 项目"显示所有文件 在"显示所有文件"的情况下,可以创建文件件 "新建文件夹"需要添加到物理路径中时,可以选择&quo ...