尝试使用复合触发器解决变异表问题

Question

我正在尝试按照Mutating Table Compound Trigger 的说明根据子表的 id 更新父表并避免发生变异表错误。

我需要获取BLATChildren表中当前记录的父ID（BLATranscriptId），然后子记录更新完成后，我需要提取符合我条件的当前计数并对父表 BLATranscript 执行更新。

此错误已解决 - 我的绑定变量“transcriptID”在代码的“AFTER EACH ROW”部分中出现错误。我已经验证了 BLATChildren.BLATranscriptId 存在并且拼写正确。 解决方案 将 AFTER EACH ROW 更改为 AFTER STATEMENT。

新问题 - 触发器正在更新父表中的每条记录，而不仅仅是匹配的父记录。

任何帮助将不胜感激。谢谢。

    CREATE OR REPLACE TRIGGER transcript_after_update
FOR UPDATE of enrollmentStatus,completionDate on blatChildren
COMPOUND TRIGGER
         transcriptID number:=0;
BEFORE EACH ROW IS 
BEGIN
       transcriptID := :new.blaTranscriptid;
END BEFORE EACH ROW;       
AFTER STATEMENT IS
BEGIN
    update BLATranscript SET (enrollmentStatus, completionDate) = (select 'C',sysdate from dual)
    where id in (select blat.id from BLATranscript blat 
    inner join BlendedActivity bla on blat.blendedactivityid=bla.id
    where blat.id=transcriptID and minCompletion<=(
    select count(countForCompletion) as total from blatChildren blac
    inner join BlendedActivityMembership bam on blac.childActivityId=bam.childActivityId
    where completionDate>=sysdate-acceptPrevWork
    and blat.id=transcriptID
    and blac.enrollmentStatus='C'));
END AFTER STATEMENT;
END;   
/

Answer 1

您需要为每一行部分收集:new.blaTranscriptid int PL/SQL 表
以及将使用此 PL/SQL 表执行更新的语句部分。
喜欢：

CREATE OR REPLACE TRIGGER transcript_after_update
FOR UPDATE of enrollmentStatus,completionDate on blatChildren
COMPOUND TRIGGER
    TYPE transcriptIDs_t  IS TABLE OF blatChildren.blaTranscriptid%TYPE;
    transcriptID transcriptIDs_t := transcriptIDs_t();
BEFORE EACH ROW IS 
BEGIN
    transcriptID.extend;
       transcriptID(transcriptID.count) := :new.blaTranscriptid;
END BEFORE EACH ROW;       
AFTER STATEMENT IS
BEGIN
  FOR i IN 1..transcriptID.COUNT
  LOOP
    update BLATranscript SET (enrollmentStatus, completionDate) = (select 'C',sysdate from dual)
    where id in (select blat.id from BLATranscript blat 
    inner join BlendedActivity bla on blat.blendedactivityid=bla.id
    where blat.id = transcriptID(i) and minCompletion<=(
    select count(countForCompletion) as total from blatChildren blac
    inner join BlendedActivityMembership bam on blac.childActivityId=bam.childActivityId
    where completionDate>=sysdate-acceptPrevWork
    and blat.id=transcriptID(i)
    and blac.enrollmentStatus='C'));
  END LOOP;
END AFTER STATEMENT;
END;   
/