[英]Insert only modified value in history table using update trigger
I want to use a trigger so when I update one column on MyTable, I will insert old value of MyTable in historytable 我想使用触发器,所以当我更新MyTable上的一列时,我会在历史表中插入MyTable的旧值
CREATE TRIGGER historytrigger
ON MyTable
BEFORE UPDATE
as
BEGIN
if UPDATING(`Unit`)
INSERT INTO `historytable`(`id_forecast`, `Unit`) VALUES (old.`ID`, old.`Unit`);
ELSEIF UPDATING(`Project_Country`)
INSERT INTO `historytable`(`id_forecast`, `Project_Country`) VALUES (old.`ID`, old.`Project_Country`);
.
.
.
.
END
this has an syntax error. 这有语法错误。
There is how I fixed this problem 我是怎么解决这个问题的
begin
IF OLD.`column`!= NEW.`column` THEN
INSERT INTO `historytable` (`id_forecast`, `Unit`) VALUES (old.`ID`, old.`column`);
ELSEIF OLD.`column1`!= NEW.`column1` THEN
INSERT INTO `historytable` (`id_forecast`, `Project_Country`) VALUES (old.`ID`, old.`column1`);
ELSEIF OLD.`column2`!= NEW.`column2` THEN
INSERT INTO `historytable` (`id_forecast`, `Project_Country`) VALUES (old.`ID`, old.`column2`);
ELSEIF OLD.`column3`!= NEW.`column3` THEN
INSERT INTO `edited_forecasts` (`id_forecast`, `Project_Country`) VALUES (old.`ID`, old.`column3`);
END IF
end
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