# File lib/dbd/pg/database.rb, line 450
450:     def __blob_open(oid, mode=PGconn::INV_READ)
451:         start_transaction unless @in_transaction
452:         @connection.lo_open(oid.to_i, mode)
453:     rescue PGError => err
454:         raise DBI::DatabaseError.new(err.message) 
455:     end