fix uploads, i.e. use binary instead of base64

[niphlod]

No description provided.

[mdipierro]

I am ok to have a flag to use one convention or the other.

[niphlod]

gave a hard though about this: unfortunately each - major - adapter has its own wrapper implementation to read file and insert into a binary.
The thing is, pydal (or, better said, DAL) was initially engineered to work around bugs in several adapters, bug that ATM are totally fixed.
I'm talking about constructing its own statement instead of using prepared statements with parameters. If we want this integration to succeed, at least the insert and the update API should be converted to use placeholders instead of relying on DAL's own serialization to string before piping it into the adapter.

[gi0baro]

@niphlod do you think is a good way to proceed?

[niphlod]

see also this . https://groups.google.com/forum/#!topic/web2py/Q5q-FpZd8qc .
@gi0baro : dunno, let's hear from @mdipierro . IMHO pydal "preparation" should be overridden in each adapter able to take parameters.

[mdipierro]

I think it makes sense that we do this. I agree we can stick to insert and update first.