RE: Restricting the range of values in a field

From: Jamadagni, Rajendra <Rajendra.Jamadagni_at_espn.com>
Date: Thu, 30 Jan 2003 08:34:29 -0800
Message-ID: <F001.0053EDA5.20030130083429@fatcity.com>

create or replace trigger my_restrictions on my_table after insert or update as
declare

   unacceptable_values exception;
begin
  begin
   if :new.my_restricted_column not in ('Blah1','blah2','Blah3') then

• Grrr .. user errored spank_user; raise unacceptable_values; end if; end; exception when unacceptable_values then raise_application_error(20001,'You entered incorrect values, go spank yourself.'); when others then raise; end; /

this should pretty much handle it for you ... don't take this code at its face value, there could be syntactic errors .. I just wrote on the fly.

Raj

---

Rajendra Jamadagni MIS, ESPN Inc.
Rajendra dot Jamadagni at ESPN dot com
Any opinion expressed here is personal and doesn't reflect that of ESPN Inc.

QOTD: Any clod can have facts, but having an opinion is an art!

-----Original Message-----
Sent: Thursday, January 30, 2003 11:01 AM To: Multiple recipients of list ORACLE-L

Is there any way you can specify that the only permissible values (is it called a domain?) that can be entered in varchar2 field in an Oracle table to, for example, A, B and C?

We can restrict what values users can enter at the application level, but it would be nice to be able to also restrict what can be entered at the database level, in case other means of entering data are ever used or if the application layer fails, for whatever reason, to trap an unwanted value.

Thanks

--

Aidan Whitehall <aidanwhitehall_at_fairbanks.co.uk> Macromedia ColdFusion Developer
Fairbanks Environmental Ltd +44 (0)1695 51775

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Author: Aidan Whitehall
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Author: Jamadagni, Rajendra
  INET: Rajendra.Jamadagni_at_espn.com

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