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;

1.所有的 变量的声明一定要在最前面，不能在后面声明，否则会报错

2. 这里使用了while循环来多次插入