inverse

Hibernate 多对多的增删改查你得先了解inverse功能作用。

百度文档：

Inverse是hibernate双向关系中的基本概念。inverse的真正作用就是指定由哪一方来维护之间的关联关系。当一方中指定了“inverse=false”（默认），那么那一方就有责任负责之间的关联关系。

Hibernate仅仅按照主控方对象的状态的变化来同步更新数据库。按照原来的映射文件，people.getAddresses().add(address)，即主控方对象的状态发生了改变，因此数据库会跟着对象状态的变化来同步更新数据库；而address.setPeople(people)，即被控方对象的状态发生了改变，它是不能触发对象和数据库的同步更新的。

下面直接上代码（简单的五表权限）：

实体类：

Menu 实体类：

package com.zking.entity;import java.util.HashSet;
import java.util.Set;
import java.util.UUID;public class Menu {private String mid=String.valueOf(UUID.randomUUID());;private String mname;private transient Set<Role> sr=new HashSet<>();public Menu() {super();// TODO Auto-generated constructor stub}public Menu(String mid, String mname, Set<Role> sr) {super();this.mid = mid;this.mname = mname;this.sr = sr;}public String getMid() {return mid;}public void setMid(String mid) {this.mid = mid;}public String getMname() {return mname;}public void setMname(String mname) {this.mname = mname;}public Set<Role> getSr() {return sr;}public void setSr(Set<Role> sr) {this.sr = sr;}}

Role实体类：

package com.zking.entity;import java.util.HashSet;
import java.util.Set;
import java.util.UUID;public class Role {private String rid=String.valueOf(UUID.randomUUID());;private String rname;private transient Set<Users> su=new HashSet<>();private Set<Menu> sm=new HashSet<>();public Role() {super();// TODO Auto-generated constructor stub}public Role(String rid, String rname, Set<Users> su, Set<Menu> sm) {super();this.rid = rid;this.rname = rname;this.su = su;this.sm = sm;}public String getRid() {return rid;}public void setRid(String rid) {this.rid = rid;}public String getRname() {return rname;}public void setRname(String rname) {this.rname = rname;}public Set<Users> getSu() {return su;}public void setSu(Set<Users> su) {this.su = su;}public Set<Menu> getSm() {return sm;}public void setSm(Set<Menu> sm) {this.sm = sm;}}

Users实体类：

package com.zking.entity;import java.util.HashSet;
import java.util.Set;
import java.util.UUID;public class Users {private String uid=String.valueOf(UUID.randomUUID());private String uname;private Set<Role> sr=new HashSet<>();public Users() {super();// TODO Auto-generated constructor stub}public Users(String uid, String uname, Set<Role> sr) {super();this.uid = uid;this.uname = uname;this.sr = sr;}public String getUid() {return uid;}public void setUid(String uid) {this.uid = uid;}public String getUname() {return uname;}public void setUname(String uname) {this.uname = uname;}public Set<Role> getSr() {return sr;}public void setSr(Set<Role> sr) {this.sr = sr;}}

实体类HBM.XML的文档

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- Generated 2018-9-11 11:25:08 by Hibernate Tools 3.5.0.Final -->
<hibernate-mapping><class name="com.zking.entity.Menu" table="MENU"><id name="mid" type="java.lang.String"><column name="MID" /><generator class="assigned" /></id><property name="mname" type="java.lang.String"><column name="MNAME" /></property><set name="sr" table="rolemenu" inverse="true" lazy="false"cascade="save-update"><key column="mid"></key><many-to-many column="rid" class="com.zking.entity.Role"></many-to-many></set></class>
</hibernate-mapping>

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- Generated 2018-9-11 11:25:08 by Hibernate Tools 3.5.0.Final -->
<hibernate-mapping><class name="com.zking.entity.Users" table="USERS"><id name="uid" type="java.lang.String"><column name="UID" /><generator class="assigned" /></id><property name="uname" type="java.lang.String"><column name="UNAME" /></property><set name="sr" table="usersrole" inverse="true" lazy="false"cascade="save-update"><key column="uid"></key><many-to-many class="com.zking.entity.Role" column="rid"></many-to-many></set></class>
</hibernate-mapping>

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- Generated 2018-9-11 11:25:08 by Hibernate Tools 3.5.0.Final -->
<hibernate-mapping><class name="com.zking.entity.Role" table="ROLE"><id name="rid" type="java.lang.String"><column name="RID" /><generator class="assigned" /></id><property name="rname" type="java.lang.String"><column name="RNAME" /></property><set name="su" table="usersrole" inverse="false" lazy="false"cascade="save-update"><key column="rid"></key><many-to-many column="uid" class="com.zking.entity.Users"></many-to-many></set><set name="sm" table="rolemenu" inverse="false" lazy="false"cascade="save-update"><key column="rid"></key><many-to-many column="mid" class="com.zking.entity.Menu"></many-to-many></set></class>
</hibernate-mapping>

CFG.XML文档：

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- Generated 2018-9-11 11:25:08 by Hibernate Tools 3.5.0.Final -->
<hibernate-mapping><class name="com.zking.entity.Users" table="USERS"><id name="uid" type="java.lang.String"><column name="UID" /><generator class="assigned" /></id><property name="uname" type="java.lang.String"><column name="UNAME" /></property><set name="sr" table="usersrole" inverse="true" lazy="false"cascade="save-update"><key column="uid"></key><many-to-many class="com.zking.entity.Role" column="rid"></many-to-many></set></class>
</hibernate-mapping>

测试类：

package com.zking.test;import java.util.Set;import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
import org.junit.Test;import com.alibaba.fastjson.JSON;
import com.zking.entity.Menu;
import com.zking.entity.Role;
import com.zking.entity.Users;public class MyTest {@Testpublic void add() {Configuration configuration = new Configuration().configure();SessionFactory sessionFactory = configuration.buildSessionFactory();Session session = sessionFactory.openSession();Transaction transaction = session.beginTransaction();//用户Users u1=new Users();u1.setUname("admin");Users u2=new Users();u2.setUname("System");//角色Role r1=new Role();r1.setRname("Admin");Role r2=new Role();r2.setRname("System_Admin");//菜单Menu m1=new Menu();m1.setMname("角色管理");Menu m2=new Menu();m2.setMname("查看信息");//互设u1.getSr().add(r1);u2.getSr().add(r2);r1.getSu().add(u1);r2.getSu().add(u2);r1.getSm().add(m1);r2.getSm().add(m2);//保存session.save(u1);session.save(u2);//提交transaction.commit();session.close();sessionFactory.close();}@Testpublic void query() {Configuration configuration = new Configuration().configure();SessionFactory sessionFactory = configuration.buildSessionFactory();Session session = sessionFactory.openSession();//h获得当前用户Users u=session.get(Users.class, "265bdd39-5b11-4deb-9099-2b04a714ebe2");//转为JSON格式String str=JSON.toJSONString(u);//输出StrSystem.out.println(str);}@Testpublic void delete() {Configuration configuration = new Configuration().configure();SessionFactory sessionFactory = configuration.buildSessionFactory();Session session = sessionFactory.openSession();Transaction transaction = session.beginTransaction();// 得到用户Users u = session.get(Users.class, "265bdd39-5b11-4deb-9099-2b04a714ebe2");// 得到当前用户所有权限Set<Role> sr = u.getSr();// 循环SET集合for (Role r : sr) {// 判断需要删除的权限if (r.getRname().equals("Admin")) {// 从权限表中获得用户再删除当前用户r.getSu().remove(u);}}session.update(u);transaction.commit();session.close();sessionFactory.close();}
}

代码什么的都在上面！

有什么不足的地方还请各位多多指教！！！

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Hibernate 多对多的增删改查。

inverse

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