Re: making a rule and know when it is violated

"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