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我正在嘗試設置一個MySQL觸發器，但我無法弄清楚如何得到我想要的結果。我想我需要設置一個MySQL @variable，但是我嘗試過的方法沒有奏效，我一直無法找到一個好的資源。我更改了phpMyAdmin中的分隔符，並且下面的註釋未在實際查詢中使用。MySQL @variable
CREATE TRIGGER coroner AFTER INSERT ON events
FOR EACH ROW BEGIN
UPDATE teams SET live = live-1 WHERE id = NEW.victim;
UPDATE teams SET score = score+NEW.value WHERE id = NEW.shooter;
UPDATE teams SET last_active = NEW.time WHERE id = NEW.shooter OR id = NEW.victim;
// up to here all works fine
IF (SELECT live FROM teams WHERE id = NEW.victim) = 0 THEN
UPDATE teams SET slot = slot-1 WHERE slot > OLD.slot;
ENDIF;
END
什麼我實際上在這裏做正在安排在一個圓圈一個團隊，而當時球隊的最後一名選手已經被淘汰了，我關閉了一圈沒有它。
下面是從phpMyAdmin的錯誤消息：
#1363 - There is no OLD row in on INSERT trigger
感謝您的幫助
新的嘗試：
CREATE TRIGGER coroner AFTER INSERT ON events
FOR EACH ROW BEGIN
UPDATE teams SET live = live-1 WHERE id = NEW.victim;
UPDATE teams SET score = score+NEW.value WHERE id = NEW.shooter;
UPDATE teams SET last_active = NEW.time WHERE id = NEW.shooter OR id = NEW.victim;
SET @pivot := (SELECT slot FROM teams WHERE id = NEW.victim);
IF (SELECT live FROM teams WHERE id = NEW.victim) = 0 THEN
UPDATE teams SET slot = slot+1 WHERE slot < @pivot;
ENDIF;
END
錯誤：
#1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '; END' at line 9