一、基础工作

1、创建项目springboot项目，勾选web+JDBC+MySQL驱动

2、导入mybatis-springboot-starter依赖

  <!-- mybatis-springboot-starter-->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.2.2</version>
        </dependency>

这里应该注意版本对应

3、编写application.properties配置文件

#数据库配置 根据自己数据库username和password修改
spring.datasource.username=root
spring.datasource.password=123456
spring.datasource.url=jdbc:mysql://localhost:3306/mybatis?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8&useSSL=false
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver

#整合mybatis
#给pojo实体类起别名
mybatis.type-aliases-package=com.kuang.pojo  
#接口的配置文件的位置 我这里接口配置文件是UserMapper.xml 如下图所示
mybatis.mapper-locations=classpath:mybatis/mapper/*.xml 

二、springboot整合mybatis案例

上面基础工作做好，其实基础框架就已经搭建好了，直接开始进行案例的操作就可以了。

项目结构

1、编写pojo包下的实体类User

package com.kuang.pojo;


public class User {
    

    private int id;
    private String name;
    public String 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;
    }

    public User(int id, String name, String pwd) {
    
        this.id = id;
        this.name = name;
        this.pwd = pwd;
    }

    public User() {
    
    }

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

2、编写接口UserMapper

import com.kuang.pojo.User;
import org.apache.ibatis.annotations.Mapper;
import org.springframework.stereotype.Component;
import org.springframework.stereotype.Repository;

import java.util.List;


 /*加了这个注解 就表示了 这是一个Mybatis的mapper类
就相当于之前使用的spring整合mybatis接口 也可以使用@MapperScan("com.kuang.mapper")*/
@Mapper

/**@Component 也可以用这个 万能的*/
@Repository
public interface UserMapper {
    



    List<User> queryUserList();

    User queryUserById(int id);

    int addUser(User user);

    int updateUser(User user);

    int deleteUser(int id);


}

3、编写接口实现配置文件UserMapper.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.kuang.mapper.UserMapper">
    <select id="queryUserList" resultType="User">
        select * from mybatis.user

    </select>

    <select id="queryUserById" resultType="User">
        select *
        from mybatis.user
        where id=#{
    id};
    </select>

    <insert id="addUser" parameterType="User">
    insert into mybatis.user(id,name,pwd)
    values(#{
    id},#{
    name},#{
    pwd});

    </insert>

    <update id="updateUser" parameterType="User">
        update mybatis.user
        set name=#{
    name},pwd=#{
    pwd}
        where id=#{
    id};
    </update>

    <delete id="deleteUser" parameterType="int">
     delete
     from mybatis.user
     where id=#{
    id};

    </delete>

</mapper>

配置文件UserMapper.xml的位置
4、编写contoller中UserController

import com.kuang.mapper.UserMapper;
import com.kuang.pojo.User;
import org.omg.CORBA.PUBLIC_MEMBER;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;
import sun.net.util.IPAddressUtil;

import java.util.List;

@RestController
public class UserController {
    

    @Autowired
    private UserMapper userMapper;

    @GetMapping("/queryUserList")
    public List<User> queryUserList(){
    
        List<User> userList = userMapper.queryUserList();

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

        return userList;
    }

    @GetMapping("/queryUserById")
    public User queryUserById(){
    

        User user = userMapper.queryUserById(1);
        return user;



    }


    @GetMapping("/addUser")
    public String addUser(){
    
        userMapper.addUser(new User(21,"阿毛","123456"));
        return "添加成功";

    }

    @GetMapping("/updateUser")
    public String updateUser(){
    
        userMapper.updateUser(new User(1,"秃驴","123465"));
        return "更改成功";
    }


    @GetMapping("/deleteUser")
    public String deleteUser(){
    
        userMapper.deleteUser(1);
        return "删除成功";

    }


}

至此，springboot整合mybatis 并且进行增删改查操作就全部结束了。