SpringBoot集成MyBatis和MySQL

Posted 2021-09-09 音神

文章目录

• 1. 创建SpringBoot项目
• 2. 添加MyBatis和MySQL依赖
• 3. 添加MyBatis和MySQL配置
• 4. 创建数据库
• 5. 创建UserController类
• 6. 创建User类
• 7. 创建UserService类
• 8. 创建UserMapper接口
• 9. 创建UserMapper.xml文件
• 10. 测试连接
• 11. 源码地址

1. 创建SpringBoot项目

创建SpringBoot项目可以在Spring官方网站创建，也可以使用IDE开发工具创建。

2. 添加MyBatis和mysql依赖

<!--MyBatis-->
<dependency>
    <groupId>org.mybatis.spring.boot</groupId>
    <artifactId>mybatis-spring-boot-starter</artifactId>
    <version>2.2.0</version>
</dependency>

<!--MySQL-->
<dependency>
	<groupId>mysql</groupId>
	<artifactId>mysql-connector-java</artifactId>
	<scope>runtime</scope>
</dependency>

<dependency>
	<groupId>org.projectlombok</groupId>
	<artifactId>lombok</artifactId>
</dependency>

3. 添加MyBatis和MySQL配置

#MySQL
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/spring_boot_mybatis
spring.datasource.username=root
spring.datasource.password=666666

#MyBatis
mybatis.configuration.map-underscore-to-camel-case=true
mybatis.mapper-locations=classpath:/mapper/**/*.xml

4. 创建数据库

#创建数据库
CREATE DATABASE `spring_boot_mybatis` /*!40100 DEFAULT CHARACTER SET utf8mb4 */;

#创建数据表
CREATE TABLE `user` (
  `Id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(10) DEFAULT NULL COMMENT '姓名',
  `gender` char(1) DEFAULT NULL COMMENT '性别',
  `age` tinyint(3) DEFAULT NULL COMMENT '年龄',
  PRIMARY KEY (`Id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COMMENT='用户表';

#添加数据
insert into `user` values(null,'唐嫣','女',30),(null,'郭碧婷','女',28);

5. 创建UserController类

package com.example.demo.controller;

import com.example.demo.service.UserService;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * @ClassName UserController
 * @Description TODO
 * @Author qwer
 * @Date 2021/8/22 1:45
 * @Version 1.0
 */
@RestController
@RequestMapping("/user")
public class UserController {

    private final UserService userService;

    public UserController(UserService userService) {
        this.userService = userService;
    }

    @GetMapping("/list")
    public Object list() {
        return userService.list();
    }
}

6. 创建User类

package com.example.demo.domain;

import lombok.Data;

/**
 * @ClassName User
 * @Description TODO
 * @Author qwer
 * @Date 2021/8/22 1:46
 * @Version 1.0
 */
@Data
public class User {
    private Long id;
    private String name;
    private String gender;
    private Integer age;
}

7. 创建UserService类

package com.example.demo.service;

import com.example.demo.domain.User;
import com.example.demo.mapper.UserMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

/**
 * @ClassName UserService
 * @Description TODO
 * @Author qwer
 * @Date 2021/8/22 1:54
 * @Version 1.0
 */
@Service
public class UserService {
    private final UserMapper userMapper;

    public UserService(UserMapper userMapper) {
        this.userMapper = userMapper;
    }

    public List<User> list(){
        return userMapper.list();
    }
}

8. 创建UserMapper接口

package com.example.demo.mapper;

import com.example.demo.domain.User;
import org.apache.ibatis.annotations.Mapper;

import java.util.List;

@Mapper
public interface UserMapper {
    List<User> list();
}

9. 创建UserMapper.xml文件

<?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.example.demo.mapper.UserMapper">

    <select id="list" resultType="com.example.demo.domain.User">
        select * from `user`
    </select>

</mapper>

10. 测试连接

http://127.0.0.1:8080/user/list

11. 源码地址

https://github.com/ofoo/spring-boot-mybatis