2.3编写代码

实体类

package pojo;
//实体类
public class User {
    private int id;
    private String name;
    private String pwd;
​
    public User() {
    }
​
    public User(int id, String name, String pwd) {
        this.id = id;
        this.name = name;
        this.pwd = pwd;
    }
​
    public int getId() {
        return id;
    }
​
    public void setId(int id) {
        this.id = id;
    }
​
    public String getName() {
        return name;
    }
​
    public void setName(String name) {
        this.name = name;
    }
​
    public String getPwd() {
        return pwd;
    }
​
    public void setPwd(String pwd) {
        this.pwd = pwd;
    }
​
    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", pwd='" + pwd + '\'' +
                '}';
    }
}
​
Dao接口

package com.mu.dao;
​
import com.mu.pojo.User;
​
import java.util.List;
​
public interface UserDao {
    List<User> getUserList();
}
​
接口实现类

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "https://mybatis.org/dtd/mybatis-3-mapper.dtd">
​
<!--namespqce=绑定一个对应的Mapper接口-->
<mapper namespace="com.mu.dao.UserDao">
    
    <!--select查询语句-->
    <select id="getUserList" resultType="com.mu.pojo.User">
        select * from mybatis.user
    </select>
</mapper>