Question

为什么我不能在触发器中放入这样的条件？

CREATE OR REPLACE TRIGGER HDR_WEB_UPD
BEFORE UPDATE ON  HDR_WEB_LATEST
FOR EACH ROW
BEGIN
   IF :NEW.UPD_USR = 'MARS72' OR :NEW.UPD_USR ='ROHA' OR :NEW.UPD_USR ='TAJUL'
   THEN
          IF :NEW.STATUS = 2
          THEN
                 IF :OLD.STATUS = 2 AND :NEW.VER_USR := :OLD.VER_USR
                  THEN
                  :NEW.status := :OLD.status;
                  :NEW.VER_DATE := :OLD.VER_DATE;
                  :NEW.VER_USR := :OLD.VER_USR;

                 ELSE
                 :NEW.VER_DATE := SYSDATE;
                 :NEW.VER_USR := :NEW.UPD_USR;

          END IF;
   END IF;
   else
                    :NEW.UPD_USR := :OLD.UPD_USR;
                    :NEW.VER_DATE := :OLD.VER_DATE;
                    :NEW.VER_USR := :OLD.VER_USR;
                    :NEW.closed_date := :OLD.closed_date;
                    :NEW.CLOSE_USR := :OLD.CLOSE_USR;
                    :NEW.status := :OLD.status;
   END IF;
END;

发现的错误是

错误（8,47）：PLS-00103：期望一个符号时遇到符号“ =” 以下的：。（* @％＆=-+ / / at in是mod余数不是rem然后<>或！=或〜=> = <= <>等 ||之间的like2 like4 likec指标多集成员子多集在“ =”之前插入符号“ *”以继续。

Answer 1

条件需要评估为true，false或null。为此，您必须使用以下比较运算符之一：=，<，>，<=，> =，<>，！=，〜=，^ =，IS NULL，LIKE，BETWEEN，IN。

问题似乎在线，并且更正的行是IF :OLD.STATUS = 2 AND :NEW.VER_USR = :OLD.VER_USR。修改后的触发器如下：

CREATE OR REPLACE TRIGGER HDR_WEB_UPD
BEFORE UPDATE ON  HDR_WEB_LATEST
FOR EACH ROW
BEGIN
    IF :NEW.UPD_USR = 'MARS72' OR :NEW.UPD_USR ='ROHA' OR :NEW.UPD_USR ='TAJUL'
    THEN
            IF :NEW.STATUS = 2
            THEN
                    IF :OLD.STATUS = 2 AND :NEW.VER_USR = :OLD.VER_USR
                    THEN
                        :NEW.status := :OLD.status;
                        :NEW.VER_DATE := :OLD.VER_DATE;
                        :NEW.VER_USR := :OLD.VER_USR;
                    ELSE
                        :NEW.VER_DATE := SYSDATE;
                        :NEW.VER_USR := :NEW.UPD_USR;
                END IF;
        END IF;
    ELSE
                :NEW.UPD_USR := :OLD.UPD_USR;
                :NEW.VER_DATE := :OLD.VER_DATE;
                :NEW.VER_USR := :OLD.VER_USR;
                :NEW.closed_date := :OLD.closed_date;
                :NEW.CLOSE_USR := :OLD.CLOSE_USR;
                :NEW.status := :OLD.status;
    END IF;
END;

如何在触发器中放置Oracle语句的条件？

1 个答案: