MyBatis的配置

• Maven依赖
• mybatis-config.xml（Mybatis的配置文件）
• UserMapper（Mapper接口）
• Dao（实体类）
• Usermapper.xml（mapper的配置类）
• 包结构

    
        org.mybatis
        mybatis
        3.5.7
    
    
        mysql
        mysql-connector-java
        8.0.26
    

package cn.itcast.mapper;

import cn.itcast.pojo.User;

import java.util.List;

public interface UserMapper {
   public List selectUser();
}

package cn.itcast.pojo;

public class User {
   private int id;  //id
   private String name;   //姓名
   private String pwd;   //密码

    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 + ''' +
                '}';
    }
}

    
    select * from user