Re: Declaring subtypes

[Marin David Condic <nobody@noplace.com>]

Of course, it depends a little on the nature of the database, but 
subtypes are not inappropriate for database fields that you expect to 
have around as more or less permanent things. You might also consider 
bounded strings or unbounded strings as possibly useful ways of storing 
& manipulating things you expect to keep in a database. In any event, 
you could create subtypes from these as well to help you protect against 
mixing things up & to be sure everyone is using common sizes for the fields.

MDC

Kevin Hostelley wrote:
> I am rather new to Ada and I had a design question.  I'm working on a
> web based application and I was wondering if declaring subtypes of
> String for common database fields was overkill.  For example:
> 
> subtype Address_Line is String(1..60);
> subtype City is String(1..40);
> subtype Zip_Code is String(1..9);
> 
> 
> I understand that Strong typing is one of the strengths of Ada but I
> just don't know how far to go with it.
> 
> Thanks,
> 
> mamboking


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