Sends SQL asynchronous query request specified by sql to the PostgreSQL.Returns an Array as the resulting tuple on success. On failure, it returns nil, and error detail can be obtained by error. If there is no unprocessed notifier, it returns nil. Inserts contents of the array into the table . You should call this method after putline, or getline.
Returns nil on success, raises an exception otherwise.
Return the PGlarge instance on success. On failure, it raises PGError exception. Save a large object of oid to a file . Return the PGlarge instance on success. On failure, it raises PGError exception.