mysql使用游标 触发一次 插入多条记录

DROP TRIGGER IF EXISTS `AutoInsert`;
CREATE DEFINER=`root`@`localhost` TRIGGER `AutoInsert` AFTER INSERT ON `ml_exam` FOR EACH ROW
begin
DECLARE var_KAOHAO VARCHAR(50);
DECLARE var_KAOSHIHAO VARCHAR(50);
DECLARE var_count INT;
DECLARE STUDENT_CURSOR CURSOR FOR (SELECT KAOHAO FROM `ML_STUDENT`);
SET var_KAOSHIHAO = NEW.KAOSHIHAO;
SELECT COUNT(*) INTO var_count FROM `ML_STUDENT`;
OPEN STUDENT_CURSOR;
WHILE var_count>0 DO
FETCH STUDENT_CURSOR INTO var_KAOHAO;
INSERT INTO ML_SCORE(KAOHAO,KAOSHIHAO) VALUES(var_KAOHAO,var_KAOSHIHAO);
SET var_count = var_count -1;
END WHILE;
CLOSE STUDENT_CURSOR;
end;