-----Original Message-----
Sent: Wednesday, June 05, 2002 4:53 PM
To: Multiple recipients of list ORACLE-L
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two questions: How many records do you insert into that table before a
commit ?
Is the whole issue simply mutating table error when running some business
logic in an insert/update trigger for the intervals table?
Regards,
Waleed
I'm sorry bu I can't answer to your questions because I don't see the point.
Here's a test table:
CREATE TABLE intervals (
start_time NUMBER NOT NULL,
end_time NUMBER NOT NULL
)
Here are some statemens:
INSERT INTO intervals
(START_TIME,END_TIME)
VALUES
(3,5)
/
INSERT INTO intervals
(START_TIME,END_TIME)
VALUES
(2,3)
/
INSERT INTO intervals
(START_TIME,END_TIME)
VALUES
(7,8)
What I want is that the integrity rule (no overlapped intervals) be
operational even if i insert a new record or more or update one or more.
Think of it the same way an unique key works.
This is a simplified table for example purpose. In fact my application is a
resource scheduler, so I want a resource not to be assigned for more than 1
client at the same time.
Here the start_time and end_time are of number type just for testing, but of
course it'll be of date type.
I'm starting to think that what I want, can be done in a simple, clean
manner but using complex workarounds, isn't it?
Thanks!
iulian
-----Original Message-----
To: Multiple recipients of list ORACLE-L
Sent: 6/5/02 4:33 AM
First of all I want to thank you all for your answers.
Let's take'em one by one:
========================================================================
====
Attn: Mercadante, Thomas F [[EMAIL PROTECTED]]
- I cannont use "instead of" trigger because of this error:
ORA-25002: cannot create INSTEAD OF triggers on tables
Cause: Only BEFORE or AFTER triggers can be created on a table.
Action: Change the trigger type to BEFORE or AFTER.
I have an Oracle database version 9.0.1.1.1
========================================================================
====
Attn: Stephane Faroult [[EMAIL PROTECTED]]
- for insert your approach works (although I have to change a bit the
select
in exists condirion) but what about the update statements.
- moreover i think this will not keep my integrity rule consistent, if
someone try to simply use typical insert&update statements.
========================================================================
====
Attn: Khedr, Waleed [[EMAIL PROTECTED]]
- Can you give me an example for your unique function based index, I
mean
how can you assign an unique number for various intervals.
- anyway if this can be done I assume that would be a very nice, clean
solution
========================================================================
====
Attn: Richard Huntley [[EMAIL PROTECTED]], Gogala, Mladen
[[EMAIL PROTECTED]]
- this really doesn't suit my needs, create 2 tables instead of one
========================================================================
====
Attn: DENNIS WILLIAMS [[EMAIL PROTECTED]], Aponte, Tony
[[EMAIL PROTECTED]]
- I did make a function:
FUNCTION check_for_overlapped_intervals (
p_start_time IN NUMBER,
p_end_time IN NUMBER)
RETURN NUMBER
IS
n NUMBER;
BEGIN
-- when this select have records to count
-- means that the new interval overlap an existing one
-- and still is not corectly implement for update stament
-- where it should not consider the current record
SELECT COUNT(*) INTO n
FROM intervals
WHERE start_time < p_end_time
AND end_time > p_start_time;
RETURN(n);
END;
and use it in the trigger:
CREATE OR REPLACE TRIGGER bi_interval
BEFORE INSERT OR UPDATE
ON intervals
REFERENCING NEW AS NEW OLD AS OLD
FOR EACH ROW
BEGIN
IF check_for_overlapped_intervals(:new.start_time, :new.end_time) <> 0
THEN
raise_application_error(-20100, 'Overlapped intervals');
END IF;
END;
but still got the same mutating table error. Am I wrong someplace.
========================================================================
====
Thanks again. I try to test all of your solution and above are my
answers.
Can you still help me.
I simplify my problem using a table INTERVALS with 2 columns START_TIME,
END_TIME of NUMBER type.
CREATE TABLE intervals (
start_time NUMBER NOT NULL,
end_time NUMBER NOT NULL
)
Please try to insert some data and implement an integrity system like I
wanted
Regards
iulian
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