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
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