整合mybatis的CRUD5

package com.itheima.domain;

import java.io.Serializable;
import java.util.Date;
import java.util.List;

/**
 * @author 黑马程序员
 * @Company http://www.ithiema.com
 */
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 roles;

    public List getRoles() {
        return roles;
    }

    public void setRoles(List 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 +
                '}';
    }
}

package com.itheima.domain;

import java.io.Serializable;
import java.util.List;

/**
 * @author 黑马程序员
 * @Company http://www.ithiema.com
 */
public class Role implements Serializable {

    private Integer roleId;
    private String roleName;
    private String roleDesc;

    //多对多的关系映射：一个角色可以赋予多个用户
    private List users;

    public List getUsers() {
        return users;
    }

    public void setUsers(List users) {
        this.users = users;
    }

    public Integer getRoleId() {
        return roleId;
    }

    public void setRoleId(Integer roleId) {
        this.roleId = roleId;
    }

    public String getRoleName() {
        return roleName;
    }

    public void setRoleName(String roleName) {
        this.roleName = roleName;
    }

    public String getRoleDesc() {
        return roleDesc;
    }

    public void setRoleDesc(String roleDesc) {
        this.roleDesc = roleDesc;
    }

    @Override
    public String toString() {
        return "Role{" +
                "roleId=" + roleId +
                ", roleName='" + roleName + '\'' +
                ", roleDesc='" + roleDesc + '\'' +
                '}';
    }
}

package com.itheima.dao;

import com.itheima.domain.Role;

import java.util.List;

/**
 * @author 黑马程序员
 * @Company http://www.ithiema.com
 */
public interface IRoleDao {

    /**
     * 查询所有角色
     * @return
     */
    List findAll();
}

package com.itheima.dao;

import com.itheima.domain.User;

import java.util.List;

/**
 * @author 黑马程序员
 * @Company http://www.ithiema.com
 *
 * 用户的持久层接口
 */
public interface IUserDao {

    /**
     * 查询所有用户，同时获取到用户下所有账户的信息
     * @return
     */
    List findAll();


    /**
     * 根据id查询用户信息
     * @param userId
     * @return
     */
    User findById(Integer userId);


}

DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">


    
    
        
        
        
        
            
            
            
            
            
        
    

    
    
       select u.*,r.id as rid,r.role_name,r.role_desc from role r
        left outer join user_role ur  on r.id = ur.rid
        left outer join user u on u.id = ur.uid
    

DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">


    
    
        
        
        
        
        
        
        
            
            
            
        
    

    
    
        select u.*,r.id as rid,r.role_name,r.role_desc from user u
         left outer join user_role ur  on u.id = ur.uid
         left outer join role r on r.id = ur.rid
    

    
    
        select * from user where id = #{uid}
    

 

转载于:https://www.cnblogs.com/yangshuyuan1009/p/11482192.html