why is this more efficient
Found this in the constructor for the File Product and I don't understand why it is more efficient. (I want to subclass a File, so this does have some purpose ;-)) Anybody got any ideas? # First, we create the file without data: self._setObject(id, File(id,title,'',content_type, precondition)) # Now we "upload" the data. By doing this in two steps, we # can use a database trick to make the upload more efficient. self._getOb(id).manage_upload(file) ___________________________________________________________ Tim McLaughlin BCSwebservices.net Director, Technical Group 1950 Old Gallows Road tel: (703) 790.8081 x111 Suite 201 tim@bcswebservices.net Vienna, VA 22182 www .bcswebservices. net
On Mon, 23 Apr 2001, Tim McLaughlin wrote:
Found this in the constructor for the File Product and I don't understand why it is more efficient. (I want to subclass a File, so this does have some purpose ;-)) Anybody got any ideas?
# First, we create the file without data: self._setObject(id, File(id,title,'',content_type, precondition))
# Now we "upload" the data. By doing this in two steps, we # can use a database trick to make the upload more efficient. self._getOb(id).manage_upload(file)
It's more efficient because manage_upload commits subtransactions every N bytes and your main process memory doesn't grow to the size of the file. -Michel
participants (2)
-
Michel Pelletier -
Tim McLaughlin