首页 > 解决方案 > 变异,触发器/函数在使用触发器时可能看不到错误

问题描述

我有一个表 bugs_metadata,比如 create table bugs_metadata(REPORT_NAME varchar2(10), WHERE_CLAUSE varchar2(100)); 插入 bugs_metadata('test','29603754,29605708,29649865'); 在更新上表中的 WHERE_CLAUSE 列时,我在下面的触发器中收到“变异,触发器/函数可能看不到它”错误:

create or replace TRIGGER "c_b_c_b_update" AFTER  
    UPDATE ON bugs_metadata
    FOR EACH ROW 
BEGIN
CASE
  WHEN UPDATING('WHERE_CLAUSE') THEN
  IF :NEW.WHERE_CLAUSE is not null THEN 
    insert into bug_data(BUG_NUMBER,SUBJECT)
    select rptno,SUBJECT 
    from rpthead 
    where rptno in (select regexp_substr(:NEW.WHERE_CLAUSE,'[^,]+',1,level) WHERE_CLAUSE  
                    from bugs_metadata t2 
                    connect by regexp_substr(:NEW.WHERE_CLAUSE,'[^,]+',1,level) is not null ) 
      and rptno not in(select bug_number from bug_data);

  END IF;
  END CASE; 
END;

你能告诉我这里有什么问题吗?

标签: oracleplsqldatabase-trigger

解决方案


DUAL应该使用而不是bugs_metadata. 这样做没有问题,因为您只是将一列拆分为行,因此无需使用实际表,因为值已经存在于:new.where_clause.

--> right here -->线,它标志着地点。

create or replace trigger c_b_c_b_update 
  after update on bugs_metadata
  for each row 
begin
  case
    when updating('WHERE_CLAUSE') then
      if :new.where_clause is not null then 
         insert into bug_data(bug_number, subject)
           select rptno, subject 
           from rpthead 
           where rptno in (select regexp_substr(:new.where_clause, '[^,]+', 1, level) 
--> right here -->         from dual
                           connect by regexp_substr(:new.where_clause, '[^,]+', 1, level) is not null
                          ) 
             and rptno not in (select bug_number 
                               from bug_data
                              );
      end if;
  end case; 
end;

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