Thread: "function has no parameter $1" - help.

I'm trying to create a trigger to enforce a constraint onto two possible foreign tables
my function is defined as:

<-- snip -->
CREATE OR REPLACE FUNCTION sp_check_tranitem_productid(tbl_tranitem.fld_tranitem_id%TYPE,
                                tbl_tranitem.fld_tranitem_type%TYPE) RETURNS OPAQUE AS '
DECLARE
-------[Parameters]-------
        pl_product_id   ALIAS FOR $1;
        pl_product_type ALIAS FOR $2;
<-- snip -->

but when I call the function I get the error:

        function has no parameter $1

What is going wrong?

(I am using PostgreSQL 7.3.1)
,

Mike Weaver
Software Developer

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>
> I'm trying to create a trigger to enforce a constraint onto two
possible
> foreign tables
> my function is defined as:
>
> <-- snip -->
> CREATE OR REPLACE FUNCTION
> sp_check_tranitem_productid(tbl_tranitem.fld_tranitem_id%TYPE,
>                               tbl_tranitem.fld_tranitem_type%TYPE)
RETURNS
> OPAQUE AS '
> DECLARE
> -------[Parameters]-------
>       pl_product_id   ALIAS FOR $1;
>       pl_product_type ALIAS FOR $2;
> <-- snip -->
>
> but when I call the function I get the error:
>
>       function has no parameter $1
>
> What is going wrong?
>
> (I am using PostgreSQL 7.3.1)
>
The documentation says about trigger procedures:

PL/pgSQL can be used to define trigger procedures. A trigger procedure
is created with the CREATE FUNCTION command as a
function with no arguments and a return type of OPAQUE. Note that the
function must be declared with no arguments even if it
expects to receive arguments specified in CREATE TRIGGER --- trigger
arguments are passed via TG_ARGV, as described
below.

Refer to that chapter for an example.

Regards, Christoph

In > 7.3 you can also

CREATE OR REPLACE FUNCTION xxx() RETURNS TRIGGER AS'
BEGIN
END'LANGUAGE plpgsql;