springboot 整合 mybatis plus

以下是Spring Boot整合MyBatis Plus的步骤：

1.在pom.xml文件中添加MyBatis Plus的起步依赖：

<dependency>
    <groupId>com.baomidou</groupId>
    <artifactId>mybatis-plus-boot-starter</artifactId>
    <version>3.4.0</version>
</dependency>

2.在application.properties或application.yml文件中配置数据源信息：

spring.datasource.url=jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf-8&useSSL=false
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

3.创建实体类和Mapper接口，使用MyBatis Plus提供的注解来简化开发：

// 实体类
@Data
public class User {
    @TableId(type = IdType.AUTO)
    private Long id;
    private String name;
    private Integer age;
}

// Mapper接口
public interface UserMapper extends BaseMapper<User> {
}

4.在启动类上添加@MapperScan注解，扫描Mapper接口：

@SpringBootApplication
@MapperScan("com.example.demo.mapper")
public class DemoApplication {
    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }
}

5.使用MyBatis Plus提供的方法进行CRUD操作：

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

    @Override
    public User getUserById(Long id) {
        return userMapper.selectById(id);
    }

    @Override
    public List<User> getUserList() {
        return userMapper.selectList(null);
    }

    @Override
    public int addUser(User user) {
        return userMapper.insert(user);
    }

    @Override
    public int updateUser(User user) {
        return userMapper.updateById(user);
    }

    @Override
    public int deleteUser(Long id) {
        return userMapper.deleteById(id);
    }
}