【问题标题】：Oracle update trigger issueOracle 更新触发器问题
【发布时间】：2017-06-11 22:05:22
【问题描述】：

问题是我有以下触发器来监视我的特定列“CHANGED”，如果它更新为 1，我希望它将同一行和列“CHANGED_DATE”更新为当前 SYSDATE。出于某种原因，我不断收到此错误，任何帮助将不胜感激。

错误

UPDATE "SYSADM"."SHIP_CALENDAR" SET CHANGED = '1' WHERE ROWID = 'AABCxCAAEAAAKYEAAB' AND ORA_ROWSCN = '6165377066'
ORA-04091: table SYSADM.SHIP_CALENDAR is mutating, trigger/function may not see it
ORA-06512: at "SYSADM.SHIP_CALENDAR_CHANGED", line 5
ORA-04088: error during execution of trigger 'SYSADM.SHIP_CALENDAR_CHANGED'

触发器

create or replace TRIGGER SHIP_CALENDAR_CHANGED
AFTER UPDATE
   OF CHANGED
   ON SHIP_CALENDAR
   REFERENCING OLD AS o NEW AS n
   FOR EACH ROW
DECLARE  
  BEGIN
     -- UPDATE SHIP CALENDAR SET UPDATE_CHANGE TO SYSDATE IF CHANGED CHANGES
     IF :n.CHANGED = '1' then  
       UPDATE SHIP_CALENDAR
         SET CHANGED_DATE = SYSDATE
         WHERE SHIPMENT_ID = :o.SHIPMENT_ID;
     END IF;  
END;

表格

【问题讨论】：

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标签： sql oracle oracle11g

【解决方案1】：

使用before update 触发器：

create or replace TRIGGER SHIP_CALENDAR_CHANGED
BEFORE UPDATE
   OF CHANGED
   ON SHIP_CALENDAR
   REFERENCING OLD AS o NEW AS n
   FOR EACH ROW
DECLARE  
  BEGIN
     -- UPDATE SHIP CALENDAR SET UPDATE_CHANGE TO SYSDATE IF CHANGED CHANGES
     IF :n.CHANGED = '1' then  
        :n.CHANGED_DATE := SYSDATE
     END IF;  
END;

【讨论】：