[std.database] at compile time

[dennis luehring]

> Good point. I wasn't thinking of a tool to validate arbitrary SQL
> statements, but one that could validate a D model's correspondence with
> the database schema. Presumably the queries would be generated by the
> library.

what i like to see here are both parts - staticaly checked (if possible) 
for faster development - but also runtime checked (maybe in form of an 
check-mode)

for example:

you've got a varchar(12) field - how many times have you seen an check 
for the inputsize not exceeding the 12 chars?

or datetime, etc. not all databases got the same range for special type 
values

but something like that could be to database/version specific