Springboot引入(集成)Mybatis-plus

1、添加依赖

 <!--mysql数据库-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.49</version>
        </dependency>

        <!--mybatis-plus-->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.5.10.1</version>
        </dependency>
        
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.16</version>
        </dependency>

2、Controller


import com.sh.system.entity.User;
import com.sh.system.service.IUserService;

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.RestController;

import javax.annotation.Resource;
import java.util.List;

@RestController
@RequestMapping("/user")
public class UserController {

    @Autowired
    IUserService userService;

    @GetMapping("/list")
    public List<User> searchUser(){
        return userService.listUser();
    }
}

3、Entity

@Data
@TableName("user")
public class User {

    private String id;
    private String name;
}

4、Service

import com.baomidou.mybatisplus.extension.service.IService;
import com.sh.system.entity.User;
import org.springframework.stereotype.Service;

import java.util.List;


public interface IUserService extends IService<User> {

    List<User> listUser();
}

import com.baomidou.mybatisplus.extension.conditions.query.QueryChainWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.sh.system.entity.User;
import com.sh.system.mapper.UserMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import java.util.List;
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService{


    @Autowired
    UserMapper userMapper;

    @Override
    public List<User> listUser() {
        return this.list();
    }
}

5、Mapper


import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.sh.system.entity.User;
import org.apache.ibatis.annotations.Mapper;
import org.springframework.stereotype.Component;
import org.springframework.stereotype.Repository;

@Mapper  
// 可以不写该注解
// 在XXXApplication加注解@MapperScan("com.*.*.mapper")  
public interface UserMapper extends BaseMapper<User> {
}

// 可以不写该注解
// 在XXXApplication加注解@MapperScan(“com...mapper”)

<?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.sh.system.mapper.UserMapper">

</mapper>