SpringBoot uses MybatisPlus

Foreword: MybatisPlus is an enhancement tool for MyBatis. On the basis of MyBatis, only enhancements are made without changes, and it is born to simplify development and improve efficiency.

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One, import pom

<dependency>
    <groupId>com.baomidou</groupId>
    <artifactId>mybatis-plus-boot-starter</artifactId>
    <version>3.3.0</version>
</dependency>

Two, placement

Configure annotations in the entry file
@MapperScan("com.baomidou.mybatisplus.samples.quickstart.mapper")

@SpringBootApplication
@MapperScan("com.baomidou.mybatisplus.samples.quickstart.mapper")
public class Application {
    
    
    public static void main(String[] args) {
    
    
        SpringApplication.run(QuickStartApplication.class, args);
    }
}

Three, mapper needs to inherit BaseMapper

public interface User2Mapper extends BaseMapper<User> {
    
    
}

Four, use

When used in service, automatically assemble the corresponding mapper, and then use it

@Service
public class UserServiceImpl implements UserService {
    
    
    @Autowired
    private UserMapper userMapper;

    @Override
    public List<User> findAll() {
    
    
        System.out.println("使用了MybatisPlus形式编写");
        return userMapper.selectList(null);
    }

The related origin and more detailed use of MybatisPlus is not the focus of this article, you can check the official website .

Some good cases and usage skills can be viewed on the blog .