【Hibernate】---【注解】多对多
2024-09-05 14:58:34
一、核心配置文件
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/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">root</property>
<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/test</property>
<property name="hibernate.connection.username">root</property> <property name="hibernate.show_sql">true</property>
<property name="hibernate.format_sql">true</property>
<property name="hibernate.hbm2ddl.auto">update</property>
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="current_session_context_class">thread</property>
<!--
<mapping resource="com/chinasofti/entity/User.hbm.xml" />
<mapping resource="com/chinasofti/entity/Role.hbm.xml" />
-->
<mapping class="com.chinasofti.entity.User"/>
<mapping class="com.chinasofti.entity.Role"/>
</session-factory>
</hibernate-configuration>
二、实体类
User
package com.chinasofti.entity; import java.util.HashSet;
import java.util.Set; import javax.persistence.CascadeType;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.JoinTable;
import javax.persistence.ManyToMany;
import javax.persistence.OneToMany;
import javax.persistence.Table; @Entity
@Table(name="T_USER3")
public class User {
@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
private Integer user_id;
private String user_name;
private String user_password; @ManyToMany(cascade=CascadeType.ALL)
@JoinTable(name="user_role3",joinColumns=@JoinColumn(name="user_id"),inverseJoinColumns=@JoinColumn(name="role_id"))
private Set<Role> roles = new HashSet<Role>(); public Set<Role> getRoles() {
return roles;
}
public void setRoles(Set<Role> roles) {
this.roles = roles;
}
public Integer getUser_id() {
return user_id;
}
public void setUser_id(Integer user_id) {
this.user_id = user_id;
}
public String getUser_name() {
return user_name;
}
public void setUser_name(String user_name) {
this.user_name = user_name;
}
public String getUser_password() {
return user_password;
}
public void setUser_password(String user_password) {
this.user_password = user_password;
}
@Override
public String toString() {
return "User [user_id=" + user_id + ", user_name=" + user_name
+ ", user_password=" + user_password + "]";
}
}
Role
package com.chinasofti.entity; import java.util.HashSet;
import java.util.Set; import javax.persistence.CascadeType;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.JoinTable;
import javax.persistence.ManyToMany;
import javax.persistence.ManyToOne;
import javax.persistence.Table; @Entity
@Table(name="T_ROLE3")
public class Role {
@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
private Integer role_id;
private String role_name;
private String role_memo; @ManyToMany(cascade=CascadeType.ALL)
@JoinTable(name="user_role3",joinColumns=@JoinColumn(name="role_id"),inverseJoinColumns=@JoinColumn(name="user_id"))
private Set<User> user = new HashSet<User>(); public Set<User> getUser() {
return user;
}
public void setUser(Set<User> user) {
this.user = user;
}
public Integer getRole_id() {
return role_id;
}
public void setRole_id(Integer role_id) {
this.role_id = role_id;
}
public String getRole_name() {
return role_name;
}
public void setRole_name(String role_name) {
this.role_name = role_name;
}
public String getRole_memo() {
return role_memo;
}
public void setRole_memo(String role_memo) {
this.role_memo = role_memo;
}
@Override
public String toString() {
return "Role [role_id=" + role_id + ", role_name=" + role_name
+ ", role_memo=" + role_memo + "]";
}
}
三、封装类
package com.chinasofti.entity; import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration; public class HibernateUtil {
static Configuration CONFIGURATION = null;
static SessionFactory SESSION_FACTORY = null;
static Session SESSION = null;
static{
CONFIGURATION = new Configuration();
CONFIGURATION.configure();
SESSION_FACTORY = CONFIGURATION.buildSessionFactory();
SESSION = SESSION_FACTORY.openSession();
}
public static SessionFactory getSessionFactory(){
return SESSION_FACTORY;
}
public static Session openSession(){
return SESSION;
}
}
四、测试类
package com.chinasofti.entity; import org.hibernate.Session;
import org.hibernate.Transaction;
import org.junit.Test; public class TestAnnotation { @Test
public void removeRoleForUser1(){
Session session = HibernateUtil.openSession();
session.close();
} /**
* 添加用户以、角色
*/
@Test
public void testManytoManyInsert(){
Session session = HibernateUtil.openSession();
Transaction transaction = session.beginTransaction();
//创建第一个用户
User user1 =new User();
user1.setUser_name("张三");
user1.setUser_password("zhagsan");
//创建第二个用户
User user2 = new User();
user2.setUser_name("李四");
user2.setUser_password("lisi");
//创建第三个用户
User user3 =new User();
user3.setUser_name("王五");
user3.setUser_password("wangwu"); //创建第一个角色
Role role1 = new Role();
role1.setRole_name("校长");
role1.setRole_memo("校长"); //创建第二个角色
Role role2 = new Role();
role2.setRole_name("主任");
role2.setRole_memo("主任"); //创建第三个角色
Role role3 = new Role();
role3.setRole_name("门房");
role3.setRole_memo("门房"); //创建第四个角色
Role role4 = new Role();
role4.setRole_name("体育老师");
role4.setRole_memo("体育老师"); //把角色放到用户里
user1.getRoles().add(role1);
user1.getRoles().add(role2); user2.getRoles().add(role2);
user2.getRoles().add(role4); user3.getRoles().add(role3);
user3.getRoles().add(role4); //保存
session.save(user1);
session.save(user2);
session.save(user3); transaction.commit(); session.close();
}
}
补充:关系/对象映射 多对多关系(@ManyToMany 注释)【重新认识】
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