Construct an Update
for some writable parameter type A
with the given SQL string, and
optionally a Pos
and/or LogHandler
for diagnostics.
Construct an Update
for some writable parameter type A
with the given SQL string, and
optionally a Pos
and/or LogHandler
for diagnostics. The normal mechanism
for construction is the sql/fr/fr0
interpolators.
Update is a contravariant functor.