test_types_extras.py 文件源码

def test_register_default(self):
        curs = self.conn.cursor()

        def loads(s):
            return psycopg2.extras.json.loads(s, parse_float=Decimal)
        psycopg2.extras.register_default_json(curs, loads=loads)

        curs.execute("""select '{"a": 100.0, "b": null}'::json""")
        data = curs.fetchone()[0]
        self.assertTrue(isinstance(data['a'], Decimal))
        self.assertEqual(data['a'], Decimal('100.0'))

        curs.execute("""select array['{"a": 100.0, "b": null}']::json[]""")
        data = curs.fetchone()[0]
        self.assertTrue(isinstance(data[0]['a'], Decimal))
        self.assertEqual(data[0]['a'], Decimal('100.0'))