1. 基于连接表的单向“一对多”关联,应该优先被采用其中指定many-to-many的unique="true",为单向“一对多”,不指定就是单向“多对多” <class name="Person">    <id name="id" column="personId"><generator class="native"/></id>    <set n…

1. 基于外键关联的单向“多对一”关联是最常见的单向关联其中指定many-to-one的unique="true",为单向“一对一”,不指定就是单向“多对一” <class name="Person">    <id name="id" column="personId"><generator class="native"/></id>    <many…

Person与Address关联:单向N->N,[有连接表的] #和单向1->N关联代码完全相同,控制关系的一端需要增加一个set类型的属性,被关联的持久化实例以集合形式存在. #N->N关联,需要使用@ManyToMany注解来修饰待代表关联实体的集合属性. #@JoinTable注解的inverseJoinColumn属性所指定的@JoinColumn中unique=false或去掉. Person.Java package org.crazyit.app.domain; impor…

Person与Address关联:单向1->N,[有连接表的] Person.java package org.crazyit.app.domain; import java.util.HashSet;import java.util.Set; import javax.persistence.CascadeType;import javax.persistence.Column;import javax.persistence.Entity;import javax.persistence.G…

Person与Address关联:单向1->1,[有连接表的] (使用较少!) Person.java package org.crazyit.app.domain; import javax.persistence.CascadeType;import javax.persistence.Column;import javax.persistence.Entity;import javax.persistence.GeneratedValue;import javax.persistence.…

Person与Address关联:单向N->1,[有连接表的] Person.java package org.crazyit.app.domain; import javax.persistence.CascadeType;import javax.persistence.Column;import javax.persistence.Entity;import javax.persistence.GeneratedValue;import javax.persistence.Generati…

Person与Address关联:单向1->N,[无连接表的] (性能较低,不推荐使用!) Person.java package org.crazyit.app.domain; import java.util.HashSet;import java.util.Set; import javax.persistence.CascadeType;import javax.persistence.Column;import javax.persistence.Entity;import javax…

Person与Address关联:双向1->N,[有连接表的],N端.1端同时参与控制关联关系 Person.java package org.crazyit.app.domain; import java.util.HashSet;import java.util.Set; import javax.persistence.Column;import javax.persistence.Entity;import javax.persistence.GeneratedValue;import…

Person与Address关联:双向1->N,[有连接表的],N端控制关联关系 Person.java package org.crazyit.app.domain; import java.util.HashSet;import java.util.Set; import javax.persistence.Column;import javax.persistence.Entity;import javax.persistence.GeneratedValue;import javax.p…

import java.io.Serializable; import java.sql.Date; import java.sql.Timestamp; import javax.persistence.Column; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.GenerationType; import javax.persistence…