[plt-scheme] Why do folks implement statically typed languages?

Back in C++/C#/Java world a good solution is the RAII pattern - combining
validation/conversion with object construction; although it would be nicer
if it can be written declaratively, something akin to XML Schema types.

For me - type declarations should help one separate validation/cast/error
routines from the main responsibility of the procedures, and if compiler can
then take advantage of the info to perform optimizations, all the better.

yinso

On 5/31/07, Robby Findler <robby at cs.uchicago.edu> wrote:
>
> There is a standard technique the MLers use for this; they encapsulate
> the SQL command in an abstract type and only allow operations that
> make sense for constructing the values. Of course, if you are getting
> the SQL from a web page, you have to still be a little bit careful on
> how you call the parser, but probably you can some leverage out of the
> data abstraction.
>
> Robby
>
> On 5/31/07, Noel Welsh <noelwelsh at gmail.com> wrote:
> > On 5/31/07, Richard Cobbe <cobbe at ccs.neu.edu> wrote:
> > > Are there static type systems that can protect against, e.g., SQL
> > > injection?
> >
> > Not that I know of.  However you could define your SQL library using,
> > say, a 'validated' type instead of strings and then your type system
> > will prevent you from using string that haven't been validated.  Of
> > course you can do this with dynamic checks as well, with the usual
> > tradeoffs.
> >
> > Joel on Software has a post justifying the use of Hungarian notation
> > to implementation a poor man's type system for a similar use.
> >
> > N.
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