{"id": 1, "city": "beijing", "code": 2345671}
{"id": 2, "city": "shanghai", "code": 2345672}
{"id": 3, "city": "guangzhou", "code": 2345673}
{"id": 4, "city": "shenzhen", "code": 2345674}
{"id": 5, "city": "hangzhou", "code": 2345675}
{"id": 6, "city": "nanjing", "code": 2345676}
{"id": 7, "city": "wuhan", "code": 2345677}
{"id": 8, "city": "chengdu", "code": 2345678}
{"id": 9, "city": "xian", "code": 2345679}
{"id": 10, "city": "hefei", "code": 23456710}
{"id": 10, "city": null, "code": 23456711}
{"id": 10, "city": "hefei", "code": null}