Mybatis Plus代码方式实现多表关联查询

  Mapper接口如下：

• 例1

@Select("SELECT t_question.*,t_student.`name` FROM t_question,t_student WHERE t_question.student_id=t_student.id")
    List<QuestionStudentVO> getQuestionStudent(Pagination page);

• 例2

@Select("SELECT a.id,a.`name`,a.age,b.`describe` FROM USER a LEFT JOIN userinfo b ON a.id = b.user_id where a.id=#{id}")  List<Map<String, Object>> dyGetUserList(Page<Map<String,Object>> page,Integer id);