Atttypmod is a generic data type modifier. It is stored in pg_attribute
and controls length for varlena types, and precision/decimals for
numeric types, among other things. You can look in the adt/* files to
see how each type uses atttypmod.
---------------------------------------------------------------------------
Evert Carton wrote:
> Hi all,
>
> I am working on an interface between PG73 and SAS shareservers.
> SAS-share-servers allow SQL-queries to be passed to the server, and returns results.
>
> There is a C library for it.
>
> I chose 7.3, although beta because of the table-API, mainly because of the new API, and the deprecation of the old
API.
>
> I succeeded so far, more or less. I got it working with character data.
> The problem lies in numeric and date/time/datatime.
> I've been looking for information regarding atttypmod.
> Since I don't use libpq, I guess I have to create my own atttypmod value.
> But how ?
> I found some clues in the sources : src/.../utils/adt/*.c files
> Is there some more documentation about the meaning/structure of the atttypmod for the following datatypes :
> char
> varchar
> bytea
> numeric
> float
> date/time/datetime ...
>
> Regards,
>
> Evert Carton
> Medical Research Laboratories
>
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