mysql triggers
CREATE TRIGGER trigger_name
{BEFORE | AFTER} {INSERT | UPDATE| DELETE }
ON table_name FOR EACH ROW
trigger_body;
4.44
9
DELIMITER $$
CREATE TRIGGER before_workcenters_insert
BEFORE INSERT
ON WorkCenters FOR EACH ROW
BEGIN
DECLARE rowcount INT;
SELECT COUNT(*)
INTO rowcount
FROM WorkCenterStats;
IF rowcount > 0 THEN
UPDATE WorkCenterStats
SET totalCapacity = totalCapacity + new.capacity;
ELSE
INSERT INTO WorkCenterStats(totalCapacity)
VALUES(new.capacity);
END IF;
END $$
DELIMITER ;
Thank you!
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