int pg_lo_write ( resource large_object, string data [, int len] )
pg_lo_write() writes at most to a large object
from a variable data and returns the number
of bytes actually written, or FALSE in the case of an error.
large_object is a large object resource
from pg_lo_open().
To use the large object (lo) interface, it is necessary to
enclose it within a transaction block.
Note:
This function used to be called pg_lowrite().
