创建第一个Mybatis项目（详细图解）

一、创建一个Maven项目删除其中的src文件夹

二、Maven中在创建一个Maven项目该项目就为mybatis项目

三、配置mybatis所需要的架包

        
            mysql
            mysql-connector-java
            5.1.32
        
        
            org.mybatis
            mybatis
            3.2.8
        
        
            junit
            junit
            4.12

        


    

 四、创建实体类对象

package com.lisi.pojo;

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 String getName() {
        return name;
    }

    public String getPwd() {
        return pwd;
    }

    public void setId(int id) {
        this.id = id;
    }

    public void setName(String name) {
        this.name = name;
    }

    public void setPwd(String pwd) {
        this.pwd = pwd;
    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", pwd='" + pwd + '\'' +
                '}';
    }
}

必须与数据库中的保持一直

五、引入数据库资源

五、编写工具类

package com.lisi.utils;

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 java.io.IOException;
import java.io.InputStream;

public class MybatisUtils {

    private static SqlSessionFactory sqlSessionFactory;
    static{
          try {
            String resources = "mybatis-config.xml";
            InputStream inputStream = Resources.getResourceAsStream(resources);
            sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    //openSession包含面向数据库执行SQL命令的所有方法；
    public static SqlSession getSqlSession(){

        return sqlSessionFactory.openSession();
    }



}

六、定义接口

package com.lisi.dao;

import com.lisi.pojo.User;

import java.util.List;

public interface UserDao {
    List getUserList();

}

七、定义接口对应的Mapper.xml文件

    
        select * from mybatis.user;
    

八、测试运行

package com.lisi.dao;

import com.lisi.pojo.User;
import com.lisi.utils.MybatisUtils;
import org.apache.ibatis.session.SqlSession;
import org.junit.Test;

import java.util.List;

public class UserDaoTest {
    @Test
    public void Test(){
        //获取sqlSession对象
        SqlSession sqlSession = MybatisUtils.getSqlSession();
        //执行SQL对象
        UserDao userDao = sqlSession.getMapper(UserDao.class);
        List userList = userDao.getUserList();


        for (User user : userList){
            System.out.println(user);
        }

        sqlSession.close();
    }
}

查看结果：

具体的项目结构如下：