由学生学号查询该学生对应的课表--查询函数

CREATE DEFINER=`root`@`localhost` PROCEDURE `NewProc`(IN `学号` VARCHAR(15))
BEGIN
    START TRANSACTION;
        SET @sql1 = CONCAT('SELECT `班级` INTO @classname FROM `2018-9-30在校学生名单` WHERE `学号`=',`学号`,';');
      prepare stmt from @sql1;  -- 预处理需要执行的动态SQL，
        EXECUTE stmt;
        deallocate prepare stmt;     -- 释放掉预处理段


        set @sql2 = CONCAT('SELECT * FROM ',@classname,';');
        prepare stmt from @sql2;  -- 预处理需要执行的动态SQL，
        EXECUTE stmt;
        deallocate prepare stmt;     -- 释放掉预处理段
  COMMIT;
END