Re: TRIGGERS
- From: Kean Jacinta <jacintakean@xxxxxxxxx>
- To: oracle-l@xxxxxxxxxxxxx
- Date: Wed, 18 May 2005 10:05:19 -0700 (PDT)
HI,
the error i get :
ORA-0001: unique constraint violated
Here is the entire create trigger
CREATE OR REPLACE TRIGGER "TESTDB"."MYCLASS_TR" BEFORE
INSERT
OR UPDATE ON "MYCLASS" FOR EACH ROW DECLARE
REFCOUNT NUMBER;
DUP_VAL_ON_INDEX EXCEPTION;
TEMP NUMBER;
BEGIN
IF INSERTING THEN
LOOP
SELECT COUNT(*) INTO REFCOUNT
FROM MYCLASS
WHERE :NEW.ID = ID;
IF REFCOUNT > 0 THEN --RECORD EXISTED IN
DATABASE
SELECT MYCLASS_SEQ.NEXTVAL INTO TEMP FROM DUAL;
END IF;
EXIT;
--ELSIF REFCOUNT < 0 THEN
-- EXIT;
-- END IF;
END LOOP;
IF :NEW.ID IS NULL THEN
SELECT MYCLASS_SEQ.NEXTVAL
INTO :NEW.ID
FROM DUAL;
END IF;
END IF; --MAIN IF
END;
thank
JK
--- david wendelken <davewendelken@xxxxxxxxxxxxx>
wrote:
> I don't think you should be getting a unique key
> error with the pre-insert row trigger you are
> showing.
> I think you should be getting a totally different
> error.
>
> Please show the entire create trigger statement, not
> just the pl/sql code in it.
>
> -----Original Message-----
> From: Kean Jacinta <jacintakean@xxxxxxxxx>
> Sent: May 18, 2005 9:33 AM
> To: oracle-l@xxxxxxxxxxxxx
> Subject: Re: TRIGGERS
>
> HI,
>
> here is what i have written in trigger body, i am
> really stuck here. help me up , it;s still not
> working
> . System still complain about the unique key error.
> **:(
>
>
> DECLARE
> REFCOUNT NUMBER;
> DUP_VAL_ON_INDEX EXCEPTION;
> TEMP NUMBER;
>
> BEGIN
> IF INSERTING THEN
>
> LOOP
> SELECT COUNT(*) INTO REFCOUNT
> FROM myclass
> WHERE :NEW.id = id;
>
> IF REFCOUNT > 0 THEN --RECORD EXISTED IN
> DATABASE
> SELECT myclass_seq.NEXTVAL INTO TEMP FROM
> DUAL;
> END IF;
>
>
> END LOOP;
>
> IF :NEW.ID IS NULL THEN
>
>
> SELECT myclass_SEQ.NEXTVAL
> INTO :NEW.ID
> FROM DUAL;
> END IF;
>
> END IF; --MAIN IF
>
> END;
>
>
> Note : have no idea how to use the exception handler
>
>
>
>
> JKean
>
>
>
> --- david wendelken <davewendelken@xxxxxxxxxxxxx>
> wrote:
>
> > If you really want to handle that, you have three
> > choices:
> >
> > 1) Live with it. If you have a program that
> > assigns the id values for you, it should be
> getting
> > its next value from the sequence also. If you do
> > that, this just isn't a problem in real life. If
> > you aren't willing to ALWAYS get the next id value
> > from a sequence, you probably shouldn't be using a
> > sequence at all.
> >
> > 2) Relatively simple, partial solution. Use a
> > pre-statement trigger on insert, have it grab the
> > next sequence value and verify that the record for
> > that sequence number is not already in the table.
> > If it is, get the next sequence value until you
> find
> > an empty one. Assume that all the ones after that
> > are ok from then on. Ignore the fact taht you
> throw
> > away a sequence number each time you do a
> statement.
> > Remember, I said *partial* solution.
> >
> > 3) Read up on mutating table errors and autonomous
> > transactions. This will take you awhile to read
> and
> > experiment with. We have time to help with
> specific
> > problems, but not to write it for you.
> > Ask again after you've read that material and are
> > are stuck.
> >
> >
> >
> > -----Original Message-----
> > From: Kean Jacinta <jacintakean@xxxxxxxxx>
> > Sent: May 18, 2005 8:02 AM
> > To: david wendelken <davewendelken@xxxxxxxxxxxxx>
> > Subject: Re: TRIGGERS
> >
> > david,
> >
> > :P oh i see . I am so blur. My concern,
> >
> > ID
> > ---
> > 1 <-- autogenerated
> > 2 <-- autogenerated
> > 3 <-- autogenerated
> > 4 <-- manually created
> > 5 <-- manually created
> >
> > My current sequence stay at : 3 , if i issued an
> > autotgenerated insert again it will surely prompt
> > unique id alrdy existed... or some sort of
> database
> > error. How can then trigger being smart enough to
> > silently generate autoid 6 without raising error ?
> >
> > I am very close to my objectives alrdy :P
> >
> > Thank in advance
> > Jkean
> >
>
>
>
>
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