Kate F wrote:
I see my misunderstanding: '2' IS OF (INTEGER) yields false: fine.
However I was expecting that pg_type_of('2') would return 'INTEGER': it
wouldn't, of course. So, I understand you here: there would be no
difference between this and IS OF in the way I had imagined.
It's not even possible to have a function that determines the type of a
value given that we have overlapping types. How do you know that "2"
isn't an int8 rather than int4, or numeric, or just text. What about
'now'? That's a valid timestamp as well as text.
Now, if we had an can_be_cast_to(TEXT-VAL,TYPE) that would at least let
you check against a pre-determined list of types. The only way I know of
at present is to trap an exception if it fails.
I think you're going to have to store your arguments with their types.
--
Richard Huxton
Archonet Ltd
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