Spring Boot的MyBatis注解：@MapperScan和@Mapper

参考：Spring Boot的MyBatis注解：@MapperScan和@Mapper

1、@Mapper单独加在Mapper上

package com.tj.demo.system.mapper;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.tj.demo.system.domain.Users;
import org.apache.ibatis.annotations.Mapper;
@Mapper
public interface UsersMapper extends BaseMapper<Users> {
    //继承BaseMapper常用的增删改查
}

2、@MapperScan加在main主启动程序上，路径下的mapper就不需要在加@Mapper

package com.tj.demo;
import lombok.extern.slf4j.Slf4j;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletComponentScan;
@Slf4j  //log日志
@SpringBootApplication
@ServletComponentScan  //扫描WebFilter的注解
@MapperScan({"com.tj.demo.system.mapper"})
public class Application {
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
        log.info("项目启动成功....");
    }
}

多个mapper可以这样写，如果mapper没有scan就会报错

@Slf4j  //log日志
@SpringBootApplication
@ServletComponentScan  //扫描WebFilter的注解
@MapperScan({"com.tj.system.mapper","com.tj.base.mapper"}) //这个里加了，mapper下就不需要再加@Mapper了
public class Application {
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
        log.info("项目启动成功....");
    }
}