Question

我有桌子up_files和fgusers3。触发器应该在插入up_files之后更新fgusers3。

up_file：id，uname，days，d_leave
fgusers3：id，名称，AnualLeave，cf

我尝试了if if else语句，并且工作正常。每次用户插入数据时，触发器都会更新fgusers3表中的AnualLeave行和cf行。

DROP TRIGGER IF EXISTS `after_insert`;
CREATE DEFINER=`root`@`localhost` 
TRIGGER `after_EL` BEFORE INSERT ON `up_files` 
FOR EACH ROW 
UPDATE fgusers3 
SET fgusers3.AnualLeave = fgusers3.AnualLeave - NEW.days + fgusers3.cf,fgusers3.cf = 0 
WHERE fgusers3.name = NEW.uname AND NEW.d_leave = 'Emergency Leave'

在添加if else语句之后，出现错误。请帮助我是mysql触发器的新手：

DELIMITER #
CREATE TRIGGER `after_insert` BEFORE INSERT ON `up_files` FOR EACH ROW 
BEGIN

UPDATE fgusers3 
IF(fgusers3.cf < NEW.days ) THEN
         SET fgusers3.AnualLeave = fgusers3.AnualLeave - NEW.days +fgusers3.cf,fgusers3.cf = 0
       WHERE fgusers3.name = NEW.uname AND NEW.d_leave = 'Emergency Leave' ;

       ELSE
       SET fgusers3.cf = fgusers3.cf - NEW.days
       WHERE fgusers3.name = NEW.uname AND NEW.d_leave = 'Emergency Leave' ;
       END IF ;
END#
DELIMITER ;

说明
我尝试使用户插入“紧急假期”，如果有的话，天数将扣除年假或从去年结转（cf）。如果可用cf超过一天，那么它将从cf中扣除，否则将从年假中扣除

Answer 1

我认为这更像您想要的。

DELIMITER $$ 
CREATE TRIGGER test_trig BEFORE INSERT ON up_files 
FOR EACH ROW 
bEGIN   
    IF(fgusers3.cf < NEW.days ) THEN
    UPDATE fgusers3 
        SET fgusers3.AnualLeave = fgusers3.AnualLeave - NEW.days +fgusers3.cf,fgusers3.cf = 0 
        WHERE fgusers3.name = NEW.uname AND NEW.d_leave = 'Emergency Leave' ; 
    ELSE 
    UPDATE fgusers3
        SET fgusers3.cf = fgusers3.cf - NEW.days 
        WHERE fgusers3.name = NEW.uname AND NEW.d_leave = 'Emergency Leave' ; 
    END if;
end $$

delimiter ;

如果否，则将数据采样为问题中的文本将有所帮助。

如何使用if else语句修复mysql触发器？

1 个答案: