Thread: SELECT'ing a function call

I would like to be able to define a table with 1 column containing user
names,
and the next column being a dynamically generating function that returns a
user's quota.

I think I see how to create the shared object, and the SQL function. But,
how
do I create a table that uses a function for a column based on the value of
another
column.

For example, I tried:

CREATE TABLE test (
    num1 INTEGER,
    num2 INTEGER DEFAULT add_one('num1')
);

But that said that pg_atoi doesn't understand num1 -- so apprenting atoi is
interpreting
num1 as a string, so I tried ...DEFAULT add_one(num1) which gave a different
error.

Is this even possible? To have a "trigger" based on a select statement. I
looked at the SQL
TRIGGER command and it seems to only work for INSERT, UPDATE and DELETE. I
need a "trigger"
for SELECT's.

Thanks,
Jared H.

Command: create rule
Description: define a new rule
Syntax:
        CREATE RULE rule_name AS ON
        { SELECT | UPDATE | DELETE | INSERT }
        TO object [WHERE qual]
        DO [INSTEAD] [action|NOTHING|[actions]];


HTH
Omid

>From: "Jared H. Hudson" <jhudson@forefronthosting.com>
>To: <pgsql-general@postgresql.org>
>Subject: [GENERAL] SELECT'ing a function call
>Date: Fri, 6 Jul 2001 12:25:21 -0500
>
>
>I would like to be able to define a table with 1 column containing user
>names,
>and the next column being a dynamically generating function that returns a
>user's quota.
>
>I think I see how to create the shared object, and the SQL function. But,
>how
>do I create a table that uses a function for a column based on the value of
>another
>column.
>
>For example, I tried:
>
>CREATE TABLE test (
>     num1 INTEGER,
>     num2 INTEGER DEFAULT add_one('num1')
>);
>
>But that said that pg_atoi doesn't understand num1 -- so apprenting atoi is
>interpreting
>num1 as a string, so I tried ...DEFAULT add_one(num1) which gave a
>different
>error.
>
>Is this even possible? To have a "trigger" based on a select statement. I
>looked at the SQL
>TRIGGER command and it seems to only work for INSERT, UPDATE and DELETE. I
>need a "trigger"
>for SELECT's.
>
>Thanks,
>Jared H.
>
>
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