菜菜提个弱弱的问题:
写了个mapper,再写个测试类,然后报java.lang.NullPointerException错误
这个sql去数据库测过没问题,能查处数据
这个mapper
import cn.iocoder.yudao.module.system.dal.dataobject.user.AdminUserDO;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;
import java.util.List;
/**
*
* @author 张三
*/
@Mapper
public interface MyMapper extends BaseMapperX<AdminUserDO> {
@Select({"select * from system_users where deleted = 0 and username = '6666'"})
List<AdminUserDO> getUser();
}
这个测试类:
package cn.iocoder.yudao.module.my.controller.admin.ding.service;
import cn.iocoder.yudao.module.system.dal.dataobject.user.AdminUserDO;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import java.util.List;
class myMapperTest {
@Autowired
private MyMapper mapper;
@Test
public void test() {
List<AdminUserDO> u = mapper.getUser();//我debug这个mapper就是null,为啥
System.out.println(u);
}
}