On Aug 31, 2004, at 6:06 PM, sad wrote:
> why BOOL can not be casted to TEXT
> ....nevertheless BOOL has a textual (output) representation 't' and
> 'f' letters
> why not to use this fact to define cast to TEXT ?
I'm not sure of the reason why there isn't a built-in cast from boolean
to text, though I'm not a big fan of casts in general so it doesn't
really bother me too much. If this is something you desire, I believe
you can use CREATE CAST to make your own cast from boolean to text.
test=# select true::text;
ERROR: cannot cast type boolean to text
create or replace function bool_to_text (boolean) returns text strict language sql as ' select case
when$1 then \'t\' else \'f\' end; ';
create cast (boolean as text) with function bool_to_text(boolean) as assignment;
test=# select true::text; text
------ t
(1 row)
You can find more information at
<http://www.postgresql.org/docs/current/static/sql-createcast.html>
Hope this helps!
Michael Glaesemann
grzm myrealbox com
