making a rule and know when it is violated

From: "Nico" <nicohmail-postgresql(at)yahoo(dot)com>
To: pgsql-jdbc(at)postgresql(dot)org
Subject: making a rule and know when it is violated
Date: 2005-02-21 15:43:49
Message-ID: cvcvn4$bm0$1@news.hub.org
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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.
Anyone any ideas?
Kind regards,
Nico.

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