On Sat, Feb 21, 2015 at 4:58 PM, Eric Hanson <eric@aquameta.com> wrote:
> Hi,
>
> I'm trying to use a composite type in a WHERE clause, as described here:
>
> http://www.postgresql.org/docs/9.4/static/rowtypes.html
>
> Just pasting in the examples I get:
>
> CREATE TYPE complex AS (
> r double precision,
> i double precision
> );
>
> CREATE TYPE inventory_item AS (
> name text,
> supplier_id integer,
> price numeric
> );
>
> CREATE TABLE on_hand (
> item inventory_item,
> count integer
> );
>
> INSERT INTO on_hand VALUES (ROW('fuzzy dice', 42, 1.99), 1000);
>
>
>
> Now I want to query for that row, specifying the item in the WHERE clause.
> I can't use the ROW() notation, because all values need to be passed in as
> text. But I can't seem to get the text-based syntax to work:
>
> select * from on_hand where item='("fuzzy dice",42,1.99)';
>
> yeilds
>
> ERROR: input of anonymous composite types is not implemented
>
> I've tried various forms of quote escaping and dollar quoting as the docs
> suggest, but they all produce that same error:
>
> select * from on_hand where item='("fuzzy dice",42,1.99)';
> select * from on_hand where item='(\\""fuzzy dice\\"",42,1.99)';
> select * from on_hand where item=$$("fuzzy dice",42,1.99)$$;
>
> How do I express a composite type literal as text? Any workarounds? The
sure! all you have to to is cast it:
select * from on_hand where item='("fuzzy dice",42,1.99)'::on_hand;
merlin
