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RE: Complex Integrity Checking

From: Aponte, Tony <AponteT_at_hsn.net>
Date: Wed, 05 Jun 2002 13:59:08 -0800
Message-ID: <F001.00475AD6.20020605135908@fatcity.com> 





In my suggestion you example for check_for_overlapped_intervals would have the autonomous transaction pragma, thereby avoiding the mutating table error.



Tony Aponte



-----Original Message-----


Sent: Wednesday, June 05, 2002 10:39 AM


To: Multiple recipients of list ORACLE-L




-----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 [NDATFM_at_labor.state.ny.us]
- 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 [sfaroult_at_oriole.com]
- 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 [Waleed.Khedr_at_FMR.COM]
- 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 [rhuntley_at_mindleaders.com], Gogala, Mladen
[MGogala_at_oxhp.com]


- this really doesn't suit my needs, create 2 tables instead of one








Attn: DENNIS WILLIAMS [DWILLIAMS_at_LIFETOUCH.COM], Aponte, Tony
[AponteT_at_hsn.net]


- 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




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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Received on Wed Jun 05 2002 - 16:59:08 CDT












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