我有一个触发器,用于存储用户编辑数据时在单独的表中进行的更改。这些数据以当前数据以可读的格式写在当前数据下面,即在MySQL触发器中使用IF语句插入多行
23/04/09 22:47詹姆斯史密斯将租户名称从“George Hill”改为“George Hilling”。
我看起来有点像这样的触发器 - (这是删节版本)。
两个问题:
A)这是相当昂贵的性能代价,如果是有没有更好的方法来取? B)有没有更干净的方法来做到这一点,没有所有的IF,也许使用某种循环?
DELIMITER //
CREATE TRIGGER repair_history AFTER UPDATE ON repairs
FOR EACH ROW
BEGIN
INSERT INTO repair_edit SET repair_id=NEW.repair_id,
edit_date_time=NEW.edit_date_time, edited_by=NEW.edited_by;
IF OLD.tenant_name != NEW.tenant_name THEN
INSERT INTO repair_history SET edit_id=LAST_INSERT_ID(), field='tenant_name',
former_field_value=OLD.tenant_name, new_field_value=NEW.tenant_name;
END IF;
IF OLD.priority != NEW.priority THEN
INSERT INTO repair_history SET edit_id=LAST_INSERT_ID(), field='priority',
former_field_value=OLD.priority, new_field_value=NEW.priority;
END IF;
IF OLD.property_id != NEW.property_id THEN
INSERT INTO repair_history SET edit_id=LAST_INSERT_ID(), field='property_id',
former_field_value=OLD.property_id, new_field_value=NEW.property_id;
END IF;
IF OLD.type_id != NEW.type_id THEN
INSERT INTO repair_history SET edit_id=LAST_INSERT_ID(), field='type_id',
former_field_value=OLD.type_id, new_field_value=NEW.type_id;
END IF;
END; //
DELIMITER ;
MySQL已经列触发列? – tpdi 2009-04-23 22:25:39