Re: Function that returns Boolean

On Mon, Feb 23, 2009 at 09:39:01AM -0800, SHARMILA JOTHIRAJAH wrote:
> Hi,
> This is a simple function that returns a boolean ..

This should be an SQL function, as it doesn't do anything you need (or
would even find convenient) for a more procedural language to do:

CREATE OR REPLACE FUNCTION check_value(newValue TEXT, oldValue TEXT)
RETURNS BOOLEAN
LANGUAGE SQL
AS $$ SELECT $1 IS DISTINCT FROM $2 $$;

As others have pointed out, IS DISTINCT FROM covers the case where one
or more of the arguments is a NULL.

Cheers,
David.
>
> create or replace function check_value( newValue IN VARCHAR,
> oldValue IN VARCHAR ) RETURN BOOLEAN
> as
> '
> BEGIN
> IF ( newValue != oldValue)
> then return true;
> else
> return false;
> END IF;
> END;
> '
> LANGUAGE 'plpgsql'
>
> But I get this error...what is wrong with this ?
>
> [Error] Script lines: 1-13 -------------------------
> ERROR: syntax error at or near "RETURN"
> Line: 2
>
> Thanks
> Sharmila
>
>
>
>
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