Re: making a rule and know when it is violated

I don't know how to write it in postgresql.
"Guillaume Cottenceau" <gc@mnc.ch> schreef in bericht
news:87acpxlwkx.fsf@meuh.mnc.ch...
> "Nico" <nicohmail-postgresql 'at' yahoo.com> writes:
>
>> Hello,
>> I want to make a rule in phpPgAdmin(PostgreSQL 7.3.8-RH ).
>> Then I want to intercept any violation on that rule in java.
>> Here is the table creation code:
>> CREATE TABLE "tblUser" (
>>     "UserID" serial NOT NULL,
>>     "UserName" character varying(50) NOT NULL,
>>     "UserPass" character varying(50) NOT NULL,
>>     "UserRoleID" integer DEFAULT 3 NOT NULL
>> );
>> Now it's imperative that the field UserRoleID has maximum one record that
>> contains the integer 1. Possible other values are 2 and 3. They are
>> allowed
>> to exist in more than one record.
>> After that I need to know in java how to know when a violation of this
>> rule
>> occurs.
>
> Why not using a trigger function in postgres?
>
> --
> Guillaume Cottenceau
>
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