Обсуждение: Dynamic plpgsql help

Hi

I have the following plpgsql function that works:

DROP TYPE if exists distr CASCADE;
CREATE TYPE distr AS (b bigint, var varchar);

DROP FUNCTION IF EXISTS dist() cascade;

CREATE or replace FUNCTION dist() RETURNS setof distr
AS $$ begin
  return query EXECUTE 'Select count(*) as b, cast(mostype as varchar)
as var from segmentation group by mostype';
end $$ LANGUAGE 'plpgsql' VOLATILE;
 ;

select * from dist();

When I try to make it dynamic, I get the error:

ERROR: column "mostype" does not exist

DROP TYPE if exists distr CASCADE;
CREATE TYPE distr AS (b bigint, var varchar);

DROP FUNCTION IF EXISTS dist(text) cascade;

CREATE or replace FUNCTION dist(text) RETURNS setof distr
AS $$ begin
  return query execute 'Select count(*) as b, cast( ' ||
quote_ident($1) || ' as varchar) as var from segmentation group by '
|| quote_ident($1);
end $$ LANGUAGE 'plpgsql' VOLATILE;
 ;

select dist(mostype);

Your help is appreciated

Scott

2010/4/4 Scott Geller <sgellergsu@gmail.com>:
> Hi
>
> I have the following plpgsql function that works:
>
> DROP TYPE if exists distr CASCADE;
> CREATE TYPE distr AS (b bigint, var varchar);
>
> DROP FUNCTION IF EXISTS dist() cascade;
>
> CREATE or replace FUNCTION dist() RETURNS setof distr
> AS $$ begin
>  return query EXECUTE 'Select count(*) as b, cast(mostype as varchar)
> as var from segmentation group by mostype';
> end $$ LANGUAGE 'plpgsql' VOLATILE;
>  ;
>
> select * from dist();
>
> When I try to make it dynamic, I get the error:
>
> ERROR: column "mostype" does not exist
>
> DROP TYPE if exists distr CASCADE;
> CREATE TYPE distr AS (b bigint, var varchar);
>
> DROP FUNCTION IF EXISTS dist(text) cascade;
>
> CREATE or replace FUNCTION dist(text) RETURNS setof distr
> AS $$ begin
>  return query execute 'Select count(*) as b, cast( ' ||
> quote_ident($1) || ' as varchar) as var from segmentation group by '
> || quote_ident($1);
> end $$ LANGUAGE 'plpgsql' VOLATILE;
>  ;
>
> select dist(mostype);

maybe select dist('mostype')

regards

Pavel Stehule
>
> Your help is appreciated
>
> Scott
>
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