def _build_row(self):
row_num = self._rownumber
# Create the row
if self.row_factory:
row = self.row_factory(self)
is_tuple = False
else:
row = [None] * self._nfields
is_tuple = True
# Fill it
n = self._nfields
for i in xrange(n):
if libpq.PQgetisnull(self._pgres, row_num, i):
row[i] = None
else:
fast_parser = self._fast_parsers[i]
if fast_parser:
row[i] = fast_parser(self._pgres, row_num, i)
else:
length = libpq.PQgetlength(self._pgres, row_num, i)
val = ffi.buffer(libpq.PQgetvalue(self._pgres, row_num, i),
length)[:]
row[i] = typecasts.typecast(self._casts[i], val, length,
self)
self._rownumber += 1
if is_tuple:
return tuple(row)
return row
def _get_guc(self, name):
"""Return the value of a configuration parameter."""
with self._lock:
query = 'SHOW %s' % name
if _green_callback:
pgres = self._execute_green(query)
else:
pgres = libpq.PQexec(self._pgconn, query)
if not pgres or libpq.PQresultStatus(pgres) != libpq.PGRES_TUPLES_OK:
raise exceptions.OperationalError("can't fetch %s" % name)
rv = ffi.string(libpq.PQgetvalue(pgres, 0, 0))
libpq.PQclear(pgres)
return rv