[Hibernate] - Annotations - One To One

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[Hibernate] - Annotations - Many To Many

Hibernate annotation 多对多: 下面测试例子会自动生成一张表:card,这张是bank和user表的映射表.里头是bank_id和user_id两个组合字段. 如果想在这张映射表中加入额外的字段,那么hibernate似乎无法做到.因为这需要把多对多写成两个一对多的关系.事实上这样加额外字段到映射表,好像也是违反了DBMS的设计原则. hibernate.cfg.xml <?xml version="1.0" encoding="UTF-8"…

[Hibernate] - Annotations - One To One

Hibernate annotation 一对一的两种实现: 1)幅表中有主表的主键ID做为引用 2)幅表的主键即为主表的ID hibernate.cfg.xml <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" &qu…

JavaPersistenceWithHibernate第二版笔记-第五章-Mapping value types-007UserTypes的用法(@org.hibernate.annotations.Type、@org.hibernate.annotations.TypeDefs、CompositeUserType、DynamicParameterizedType、、、)

一.结构二.Hibernate支持的UserTypes接口  UserType —You can transform values by interacting with the plain JDBC PreparedStatement (when storing data) and ResultSet (when loading data).By implementing this interface, you can also control how Hibernate caches a…

JavaPersistenceWithHibernate第二版笔记-第五章-Mapping value types-005控制类型映射(Nationalized、@LOB、@org.hibernate.annotations.Type)

一.简介 1. 2. 3. 4. to override this default mapping. The JPA specification has a convenient shortcut annotation for this purpose, @Lob @Entity public class Item { @Lob protected byte[] image; @Lob protected String description; // ... } This maps the by…