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.
注: This function used to be called pg_lo_write().
See also pg_lo_create() and
pg_lo_open().