iulian - If it makes you feel better, write a PL/SQL procedure to do the
checking and always call it rather than the table directly. That way you've
put your rule "in the database". If you are going to adhere to this
philosophy, you're going to be into PL/SQL in a big way.
Dennis Williams
DBA
Lifetouch, Inc.
dwilliams_at_lifetouch.com
-----Original Message-----
Sent: Tuesday, June 04, 2002 11:08 AM
To: Multiple recipients of list ORACLE-L
I'm reticent about putting the checking code in the application before
insert&update statement, although I'm not sure why. I'm just thinking about
concurency and all the implications.
On the other hand I wanted to put the bussiness rules on the database side.
Anyway, I'll use this approach, you told me, after all.
But what if after I check for overlapped intervals, but before inserting,
another user insert another record with an interval extending over mine. I
know it sounds crazy but I really like to know how this kind of stuff are
implemented. That's the way the unique values constraint work, I guess, and
I'd like to know more about it.
iulian
-----Original Message-----
Sent: Tuesday, June 04, 2002 6:24 PM
To: Multiple recipients of list ORACLE-L
maybe I'm being simplistic and I know this will impact performance but
why not simply do a select to see if the condition exists before the
insert or update?
- Iulian.ILIES_at_orange.ro wrote:
> I said something like "the way the unique constraints work".
> Ok. Here's my context.
> I have a table say intervals and 2 columns start_time and end_time.
> I want to check for overlapped intervals.
> I know what conditions to check but I can't implement them.
> Thanks!
>
> iulian
>
> -----Original Message-----
> Sent: Tuesday, June 04, 2002 5:13 PM
> To: Multiple recipients of list ORACLE-L
>
>
>
> This email has been tested for viruses by F-Secure Antivirus
> administered by IT Network Department.
>
>
>
> Hi
>
>
> if unique does not suit your need what exactly do you need to check?
> duplicates: use primary key
>
>
> Jack
>
>
>
>
> Iulian.ILIES_at_oran
>
> ge.ro To: Multiple
> recipients
> of list ORACLE-L <ORACLE-L_at_fatcity.com>
> Sent by: cc: (bcc: Jack
> van
> Zanen/nlzanen1/External/MEY/NL)
> root_at_fatcity.com Subject: Complex
> Integrity
> Checking
>
>
>
>
> 04-06-2002 15:58
>
> Please respond to
>
> ORACLE-L
>
>
>
>
>
>
>
>
> Hi guys. Here's my problem.
> I want to check the new values (when inserting&updating a table)
> against
> the
> ones in the existing rows. Something like checking for duplicate
> values,
> but
> using a unique constraint doesn't suit my needs.
> I think of a before insert&update trigger, wherein checking my
> condition
> and
> raise a error if not valid. The problem is, in case of an update
> statement,
> I get the mutating "ORA-04091 table <my table> is mutating....".
> I read a lot of doc but I didn't find any helping ideas. Can you give
> me
> some, or maybe a new approach to this kind of problem?
> Thanks in advance!
>
> iulian
>
>
>
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Received on Tue Jun 04 2002 - 11:23:31 CDT
