Обсуждение: plpgsql ?

Hi all,

i have a question 'plpgsql'

my code

CREATE FUNCTION autono (text,text) RETURNS text AS ' DECLARE   a1 ALIAS FOR $1;   a2 ALIAS FOR $1;   ret_val text;
BEGIN  select tna  into ret_val from a1  where pamt_no=a2;
 
 RETURN ret_val;
END;' LANGUAGE 'plpgsql'


error run  "   select tna  into ret_val from a1  where pamt_no=a2;    "
help me ,thanks

> CREATE FUNCTION autono (text,text) RETURNS text AS '
>   DECLARE
>     a1 ALIAS FOR $1;
>     a2 ALIAS FOR $1;
>     ret_val text;
>   BEGIN
>     select tna  into ret_val from a1  where pamt_no=a2;
> 
>   RETURN ret_val;
> END;' LANGUAGE 'plpgsql'
> 
> 
> error run  "   select tna  into ret_val from a1  where pamt_no=a2;    "
You cannot give a table name as an argument. You should write different
SELECTs for different tables, like this:

if a1 = ''dummy1'' then select tna into ret_val from dummy1 where
pamt_no=a2; end if;

if a1 = ''dummy2'' then select tna into ret_val from dummy2 where
pamt_no=a2; end if;

...

And so on. Unfortunately... :-)

Zoltan

Hi, there,

see following.

Jie LIANG

Internet Products Inc.

10350 Science Center Drive
Suite 100, San Diego, CA 92121
Office:(858)320-4873

jliang@ipinc.com
www.ipinc.com

On Wed, 20 Dec 2000, guard wrote:

> Hi all,
> 
> i have a question 'plpgsql'
> 
> my code
> 
> CREATE FUNCTION autono (text,text) RETURNS text AS '
>   DECLARE
>     a1 ALIAS FOR $1;
>     a2 ALIAS FOR $1; <== $2 ??
>     ret_val text;
>   BEGIN
>     select tna  into ret_val from a1  where pamt_no=a2;
>     -- I think that table name cannot use parameter anyway in plpgsql.
>   RETURN ret_val;
> END;' LANGUAGE 'plpgsql'
> 
> 
> error run  "   select tna  into ret_val from a1  where pamt_no=a2;    "
> help me ,thanks
> 
> 
> 
> 
>