Re: plpgsql, dynamic variable lengths..

Wells Oliver <wells.oliver@gmail.com> writes:
> I am trying to create a plpgsql function which accepts a jsonb object as
> its parameter.

> This jsonb can have up to three keys, and I am trying to build out the
> dynamic SQL like this. I want to be able to pass a variable number of
> params to the RETURN QUERY EXECUTE ... USING ... because it can be 0 params
> in the JSONB object, or one, or two.

> What's the missing piece here? How can I adjust my USING to accomplish this?

I think your USING is probably fine.  But you made all the SQL fragments
refer to $1:

> begin
> SQLSTRING := 'SELECT * FROM mytable WHERE true';
> if args->>'col1' is not null then
> SQLSTRING := SQLSTRING || ' AND col1 = $1';
> end if;

> if args->>'col2' is not null then
> SQLSTRING := SQLSTRING || ' AND col2 = $1';
> end if;

> if args->>'col3' is not null then
> SQLSTRING := SQLSTRING || ' AND col3 = $1';
> end if;

Of course those need to be $1, $2, $3.

            regards, tom lane