MyBatis-Plus，如其名所示，是MyBatis的一个功能增强工具。它旨在对MyBatis的核心功能进行拓展，而不会对其原有结构或行为做出任何修改。

一、环境

系统：windows 11
软件：IntelliJ IDEA 2022.2.3
maven：maven3.8.6
JDK：1.8.0_351
springboot：2.5.3
myBatisPlus：3.3.1

二、springboot整合myBatisPlus

2.1新建

设置项目名、groupID、artfactid、version

设置选择springboot版本和基础依赖

2.2 添加Mybatis-plus和mysql依赖

在pom.xml中引入依赖

<!--Mybatis-plus的依赖-->
<dependency><groupId>com.baomidou</groupId><artifactId>mybatis-plus-boot-starter</artifactId><version>3.3.1</version>
</dependency><!--mysql的依赖-->
<dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>8.0.31</version>
</dependency>

2.3 修改配置文件

application.properties改为application.yml

# 端口号8080
server:port: 8080# 数据库名：mysql，用户名root，密码123456
spring:datasource:username: rootpassword: 123456url: jdbc:mysql://192.168.17.128:3306/test?characterEncoding=utf-8&useSSL=false&serverTimezone=UTC&rewriteBatchedStatements=truedriver-class-name: com.mysql.cj.jdbc.Driver# mybatis-plus配置
mybatis-plus:# xml文件位置mapper-locations: classpath:mapper/*.xml

2.4 新建包和文件

/src/main/java/com.gsj.springbootmp下新建包
service，controller，mapper，entity

/src/main/resouces下设置mapping文件夹

如图：

2.5 新建表

新建数据库测试表：

CREATE TABLE `user` (`id` int(11) NOT NULL AUTO_INCREMENT,`name` varchar(20) NOT NULL DEFAULT '' COMMENT '名称',`age` int(11) NOT NULL COMMENT '年龄',PRIMARY KEY (`id`) USING BTREE
) ENGINE=InnoDB COMMENT='用户表';

2.6 创建实体类

com/gsj/springbootmp/entity/User.java

package com.gsj.springbootmp.entity;import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableField;
import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableName;
import lombok.Data;
import lombok.NoArgsConstructor;@Data
@NoArgsConstructor
@TableName("user")
public class User {@TableId(type = IdType.AUTO)private Integer id;@TableField("name")private String name;@TableField("age")private Integer age;}

2.7 创建Mapper接口

com/gsj/springbootmp/mapper/UserMapper.java

package com.gsj.springbootmp.mapper;import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.gsj.springbootmp.entity.User;
import org.apache.ibatis.annotations.Mapper;@Mapper
public interface UserMapper extends BaseMapper<User> {}

2.8 创建Service接口

com/gsj/springbootmp/service/UserService.java

package com.gsj.springbootmp.service;import com.baomidou.mybatisplus.extension.service.IService;
import com.gsj.springbootmp.entity.User;public interface UserService extends IService<User> {
}

2.9 创建Service实现类

com/gsj/springbootmp/service/impl/UserServiceImpl.java

package com.gsj.springbootmp.service.impl;import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.gsj.springbootmp.entity.User;
import com.gsj.springbootmp.mapper.UserMapper;
import com.gsj.springbootmp.service.UserService;
import org.springframework.stereotype.Service;@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements UserService {
}

2.10 增删改查

com/gsj/springbootmp/controller/UserController.java

package com.gsj.springbootmp.controller;import com.gsj.springbootmp.entity.User;
import com.gsj.springbootmp.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;import java.util.List;@RestController
@RequestMapping("user")
public class UserController {@Autowiredprivate UserService userService;@RequestMapping("list")public List<User> list(){return userService.list();}@RequestMapping("getUser/{id}")public User getUser(@PathVariable String id){return userService.getById(id);}/*** 插入学生信息* @param User*/@RequestMapping("/insert")public void insertInfo(User User){User info=new User();info.setName(User.getName());info.setAge(User.getAge());userService.save(info);}/*** 根据id更新学生表信息* @param User*/@RequestMapping("/update")public void updateById(User User){User info=new User();info.setId(User.getId());info.setName(User.getName());info.setAge(User.getAge());userService.updateById(info);}/*** 根据id删除学生信息* @param id*/@RequestMapping("/delete")public void deleteById(String id){userService.removeById(id);}
}

我们可通过启动应用程序进行测试，以验证其能否顺利运作并准确从数据库提取数据。若一切正常，则表明已成功运用Spring Boot与MyBatis-Plus进行了有效集成。