5、hibernate第六课

Hibernate多对多映射关系

1.先创建 3个实体类

package com.zking.entity;import java.util.HashSet;
import java.util.Set;public class Menus {private String mid;private String mname;private Set<Roles> sr = new HashSet<Roles>();public Set<Roles> getSr() {return sr;}public void setSr(Set<Roles> sr) {this.sr = sr;}public Menus() {super();// TODO Auto-generated constructor stub}public Menus(String mid, String mname, Set<Roles> 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;}}

package com.zking.entity;import java.util.HashSet;
import java.util.Set;public class Roles {private String rid;private String rname;private Set<Users> su = new HashSet<Users>();private Set<Menus> sm = new HashSet<Menus>();public Set<Menus> getSm() {return sm;}public void setSm(Set<Menus> sm) {this.sm = sm;}public Set<Users> getSu() {return su;}public Roles(String rid, String rname, Set<Users> su, Set<Menus> sm) {super();this.rid = rid;this.rname = rname;this.su = su;this.sm = sm;}public Roles() {super();// TODO Auto-generated constructor stub}public void setSu(Set<Users> su) {this.su = su;}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;}}

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

2.hibernate.cfg.xml文件配置

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC"-//Hibernate/Hibernate Configuration DTD 3.0//EN""http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration><session-factory><property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property><property name="hibernate.connection.password">sasa</property><property name="hibernate.connection.url">jdbc:mysql://localhost:3306/books?characterEncoding=utf-8</property><property name="hibernate.connection.username">root</property><property name="show_sql">true</property><property name="format_sql">true</property><mapping resource="com/zking/entity/Menus.hbm.xml" /><mapping resource="com/zking/entity/Roles.hbm.xml" /><mapping resource="com/zking/entity/Users.hbm.xml" /></session-factory>
</hibernate-configuration>

3.配置Menus.hbm.xml和Roles.hbm.xml和Users.hbm.xml映射文件

<?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 18:49:11 by Hibernate Tools 3.5.0.Final -->
<hibernate-mapping><class name="com.zking.entity.Menus" table="MENUS"><id name="mid" type="java.lang.String"><column name="MID" /><generator class="guid" /></id><property name="mname" type="java.lang.String"><column name="MNAME" /></property><set name="sr" table="rolemenus" cascade="sava-update" inverse="false"><key><column name="mid" /></key><many-to-many class="com.zking.entity.Roles" column="rid" /></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 18:49:11 by Hibernate Tools 3.5.0.Final -->
<hibernate-mapping><class name="com.zking.entity.Roles" table="ROLES"><id name="rid" type="java.lang.String"><column name="RID" /><generator class="guid" /></id><property name="rname" type="java.lang.String"><column name="RNAME" /></property><set name="su" table="userroles"><key><column name="rid" /></key><many-to-many class="com.zking.entity.Users" column="uid" /></set><set name="sm" table="rolemenus" cascade="sava-update" inverse="true"><key><column name="rid" /></key><many-to-many class="com.zking.entity.Menus" column="mid" /></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 18:49:11 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="guid" /></id><property name="uname" type="java.lang.String"><column name="UNAME" /></property><set name="sr" cascade="sava-update" table="ROLES" inverse="true"><key><column name="uid" /></key><many-to-many class="com.zking.entity.Roles" column="rid"/></set></class>
</hibernate-mapping>

4 . 测试类

package com.zking.test;import java.util.Set;import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.junit.Test;import com.alibaba.fastjson.JSON;
import com.zking.entity.Menus;
import com.zking.entity.Roles;
import com.zking.entity.Users;public class MeU {@Testpublic void add() {Configuration config = new Configuration().configure();SessionFactory sessionFactory = config.buildSessionFactory();Session session = sessionFactory.openSession();// 创建usersUsers u1 = new Users();u1.setUname("admin");// 创建角色Roles r1 = new Roles();r1.setRname("Admin");// 创建菜单Menus m1 = new Menus();m1.setMname("sda");// 互相设置u1.getSr().add(r1);r1.getSu().add(u1);r1.getSm().add(m1);m1.getSr().add(r1);// 保存session.save(u1);session.save(r1);session.save(m1);// 提交session.beginTransaction().commit();// 关闭session.close();sessionFactory.close();}@Testpublic void query() {Configuration config = new Configuration().configure();SessionFactory sessionFactory = config.buildSessionFactory();Session session = sessionFactory.openSession();Users u1 = session.get(Users.class, "cb637e3b-b5bc-11e8-9945-54e1ad416ca2");String str=JSON.toJSONString(u1);System.out.println(str);session.close();sessionFactory.close();}@Testpublic void delete() {Configuration config = new Configuration().configure();SessionFactory sessionFactory = config.buildSessionFactory();Session session = sessionFactory.openSession();Users u1 = session.get(Users.class, "cb637e3b-b5bc-11e8-9945-54e1ad416ca2");Set<Roles> sr = u1.getSr();for (Roles roles : sr) {if (roles.getRname().equals("Admin")) {roles.getSu().remove(u1);}session.update(u1);session.beginTransaction().commit();session.close();sessionFactory.close();}}
}

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5、hibernate第六课

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