Java SpringBoot 整合 MyBatis 小案例

在这里插入图片描述

基础配置（注意版本号，容易报错）

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>3.1.6</version><relativePath/> <!-- lookup parent from repository --></parent><groupId>com.zhong</groupId><artifactId>SpringBootUseMyBatisDome</artifactId><version>0.0.1-SNAPSHOT</version><name>SpringBootUseMyBatisDome</name><description>SpringBootUseMyBatisDome</description><properties><java.version>17</java.version></properties><dependencies><!--MySQL依赖--><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>8.0.29</version></dependency><!--MyBatis 依赖--><dependency><groupId>org.mybatis</groupId><artifactId>mybatis</artifactId><version>3.5.11</version></dependency><dependency><groupId>org.mybatis.spring.boot</groupId><artifactId>mybatis-spring-boot-starter</artifactId><version>3.0.0</version></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId></dependency></dependencies><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build></project>

application.yml

spring:datasource:driver-class-name: com.mysql.cj.jdbc.Driverurl: jdbc:mysql://localhost:3306/mybatisusername: rootpassword: 123456

1、创建数据库

create database if not exists mybatis;
use mybatis;
create table IF NOT EXISTS user (id int unsigned primary key auto_increment comment 'ID',name varchar(100) comment '姓名',age tinyint unsigned comment '年龄',gender tinyint unsigned comment '性别，1:男，2:女',phone varchar (11) comment '手机号'
)comment '用户表';insert into user(id, name, age, gender, phone) VALUES (null, '白眉鹰王', 55, '1', '18800000000');
insert into user(id, name, age, gender, phone) VALUES (null, '金毛狮王', 45, '1', '18800000001');
insert into user(id, name, age, gender, phone) VALUES (null, '青翼蝠王', 38, '1', '18800000002');
insert into user(id, name, age, gender, phone) VALUES (null, '紫衫龙王', 42, '2', '18800000003');
insert into user(id, name, age, gender, phone) VALUES (null, '光明左使', 37, '1', '18800000004');
insert into user(id, name, age, gender, phone) VALUES (null, '光明右使', 48, '1', '18800000005');

2、创建 pojo 数据模型层

package com.zhong.springbootusemybatisdome.pojo;import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;/*** @ClassName : User* @Description : 学生实体类* @Author : zhx* @Date: 2024-02-26 18:19*/
@Data
@AllArgsConstructor
@NoArgsConstructor
public class User {private Integer id;private String name;private Short age;private Short gender;private String phone;
}

3、创建 mapper 逻辑层

package com.zhong.springbootusemybatisdome.mapper;import com.zhong.springbootusemybatisdome.pojo.User;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Select;/*** @ClassName : UserMapper* @Description : 学生操作接口* @Author : zhx* @Date: 2024-02-26 18:21*/
@Mapper
public interface UserMapper {@Select("select * from user where id = #{id}")public User findUserById(Integer id);
}

4、创建 service 服务层

package com.zhong.springbootusemybatisdome.service;import com.zhong.springbootusemybatisdome.pojo.User;/*** @ClassName : UserService* @Description : User 服务类* @Author : zhx* @Date: 2024-02-26 18:25*/
public interface UserService {public User findUserById(Integer id);
}

5、实现接口

package com.zhong.springbootusemybatisdome.service.impl;import com.zhong.springbootusemybatisdome.mapper.UserMapper;
import com.zhong.springbootusemybatisdome.pojo.User;
import com.zhong.springbootusemybatisdome.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;/*** @ClassName : UserServicelmpl* @Description : 服务实现类* @Author : zhx* @Date: 2024-02-26 18:26*/
@Service
public class UserServiceImpl implements UserService {@Autowiredprivate UserMapper userMapper;@Overridepublic User findUserById(Integer id) {return userMapper.findUserById(id);}
}

5、创建 controller 控制层

package com.zhong.springbootusemybatisdome.controller;import com.zhong.springbootusemybatisdome.pojo.User;
import com.zhong.springbootusemybatisdome.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;/*** @ClassName : UserController* @Description : 学生控制类* @Author : zhx* @Date: 2024-02-26 18:29*/
@RestController
public class UserController {@Autowiredprivate UserService userService;@RequestMapping("/findUserById")public User findUserById(Integer id) {return userService.findUserById(id);}
}