基于Mybatis中从角色到用户的多对多操作修改。
User类:
package com.qublog.domain;
import java.io.Serializable;
import java.util.Date;
import java.util.List;
public class User implements Serializable {
private Integer id;
private String username;
private String address;
private String sex;
private Date birthday;
//多对多的关系映射:一个用户可以具备多个角色
private List<Role> roles;
public List<Role> getRoles() {
return roles;
}
public void setRoles(List<Role> roles) {
this.roles = roles;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
public Date getBirthday() {
return birthday;
}
public void setBirthday(Date birthday) {
this.birthday = birthday;
}
@Override
public String toString() {
return "User{" +
"id=" + id +
", username='" + username + '\'' +
", address='" + address + '\'' +
", sex='" + sex + '\'' +
", birthday=" + birthday +
'}';
}
}
UserDao.xml:
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.qublog.dao.UserDao">
<!-- 定义user的resultMap -->
<resultMap id="userMap" type="user">
<id property="id" column="id"></id>
<result property="username" column="username"></result>
<result property="address" column="address"></result>
<result property="sex" column="sex"></result>
<result property="birthday" column="birthday"></result>
<!-- 配置角色集合的映射 -->
<collection property="roles" ofType="role">
<id property="roleId" column="rid"></id>
<result property="roleName" column="role_name"></result>
<result property="roleDesc" column="role_desc"></result>
</collection>
</resultMap>
<!-- 配置查询所有 -->
<select id="findAll" resultMap="userMap">
SELECT u.*, r.id as rid, r.ROLE_NAME, r.ROLE_DESC
from user u left outer join user_role ur on ur.uid=u.id
left outer join role r on r.id=ur.rid
</select>
</mapper>
UserTest类:
package com.qublog.test;
import com.qublog.dao.UserDao;
import com.qublog.domain.User;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import java.io.InputStream;
import java.util.List;
public class UserTest {
private InputStream in = null;
private SqlSession sqlSession = null;
UserDao userDao = null;
@Before //用于在测试方法执行之前执行
public void init() throws Exception {
//读取配置文件,生成字节输入流
in = Resources.getResourceAsStream("SqlMapConfig.xml");
//获取SqlSessionFactory对象
SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(in);
//获取SqlSession对象
sqlSession = factory.openSession();
//获取dao代理对象
userDao = sqlSession.getMapper(UserDao.class);
}
@After //用于在测试方法执行之后执行
public void destroy() throws Exception {
//提交事务
sqlSession.commit();
//释放资源
sqlSession.close();
in.close();
}
@Test
public void testFindAll() throws Exception {
//执行查询所有方法
List<User> users = userDao.findAll();
for (User user:users) {
System.out.println("---------每个用户的信息-----------");
System.out.println(user);
System.out.println(user.getRoles());
}
}
}