There can/will be a field type for uploaded files - technically these will be stored in the moodle data directory not in the database but they will be handled by the database module.
The available fields will be pluggable so developers can create all sorts of data types eg a phone number field may be a standard text field but with some validation added.
Yu can probably elaborate on this a little more as he's the one that is doing the bulk of code for the database module.
General developer forum
why can't blocks be downloaded from one page ??
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