an adaptor for postgres. this works, but i think my primary key and

an adaptor for postgres.  this works, but i think my primary key and
foreign key parses are hackish.  they require the pk/fk clause
_right_after_ the field declaration, which i don't think is how postgres
requires it.

also i've found a bug in the mysql parser that is in the postgres parser
as well that doesn't allow comments in the middle of table create
statements.  this will cause a failed parse:

create table x (
x int,
-- a comment
);