遍历字典列表以创建多个dynamodb条目,然后创建一个,然后停止

时间:2019-10-03 22:14:23

标签: python amazon-dynamodb boto3

我正在使用dynamodb的本地实例进行练习,从测试实例中获取项目,并将json对象放回本地表中。

例如,以id作为主键查询会给我一个“项目”响应,其中包含四个字典(在测试数据库中已确认四个记录)的列表:

{'Items': [{'processId': 'a1',
   'recommendation': {'value': Decimal('0'),
    'processor': 'John Doe'},
   'createDate': '2019-02-27T18:53:16.380Z',
   'status': 'rejected',
   'recordId': '5',
   'createdBy': 'Buddy',
   'actions': [{'actor': 'Buddy',
     'actionType': 'review',
     'note': '444551233344',
     'actorName': 'Buddy',
     'createDate': '2019-02-27T18:53:16.380Z'},
    {'actor': 'Johnny',
     'actionType': 'reject',
     'note': '234',
     'actorName': 'Johnny',
     'createDate': '2019-02-27T19:00:46.425Z'}],
   'type': 'adjusted'},
  {'processId': 'a2',
   'recommendation': {'value': Decimal('0'),
    'processor': 'John Doe'},
   'createDate': '2019-02-27T18:53:16.380Z',
   'status': 'rejected',
   'recordId': '5',
   'createdBy': 'Buddy',
   'actions': [{'actor': 'Buddy',
     'actionType': 'review',
     'note': '444551233344',
     'actorName': 'Buddy',
     'createDate': '2019-02-27T18:53:16.380Z'},
    {'actor': 'Johnny',
     'actionType': 'reject',
     'note': '234',
     'actorName': 'Johnny',
     'createDate': '2019-02-27T19:00:46.425Z'}],
   'type': 'adjusted'},
  {'processId': 'a3',
   'recommendation': {'value': Decimal('0'),
    'processor': 'John Doe'},
   'createDate': '2019-02-27T18:53:16.380Z',
   'status': 'rejected',
   'recordId': '5',
   'createdBy': 'Buddy',
   'actions': [{'actor': 'Buddy',
     'actionType': 'review',
     'note': '444551233344',
     'actorName': 'Buddy',
     'createDate': '2019-02-27T18:53:16.380Z'},
    {'actor': 'Johnny',
     'actionType': 'reject',
     'note': '234',
     'actorName': 'Johnny',
     'createDate': '2019-02-27T19:00:46.425Z'}],
   'type': 'adjusted'},
  {'processId': 'a4',
   'recommendation': {'value': Decimal('0'),
    'processor': 'John Doe'},
   'createDate': '2019-02-27T18:53:16.380Z',
   'status': 'rejected',
   'recordId': '5',
   'createdBy': 'Buddy',
   'actions': [{'actor': 'Buddy',
     'actionType': 'review',
     'note': '444551233344',
     'actorName': 'Buddy',
     'createDate': '2019-02-27T18:53:16.380Z'},
    {'actor': 'Johnny',
     'actionType': 'reject',
     'note': '234',
     'actorName': 'Johnny',
     'createDate': '2019-02-27T19:00:46.425Z'}],
   'type': 'adjusted'}],
 'Count': 4,
 'ScannedCount': 4,
 'ResponseMetadata': {'RequestId': '4LI4AVRIAQ',
  'HTTPStatusCode': 200,
  'HTTPHeaders': {'server': 'Server',
   'date': 'Thu, 03 Oct 2019 19:45:59 GMT',
   'content-type': 'application/x-amz-json-1.0',
   'content-length': '13934',
   'connection': 'keep-alive',
   'x-amzn-requestid': '4LI4AVR',
   'x-amz-crc32': '4101956423'},
  'RetryAttempts': 0}}

响应:

trimmed = blurb_from_test["Items"]

然后我将其修剪成字典列表:

for i in range(len(trimmed)):
    table_local.put_item(
        Item=trimmed[i]
    )

然后我使用put_item进行遍历:

{'Items': [{'processId': 'a4',
   'recommendation': {'value': Decimal('0'),
    'processor': 'John Doe'},
   'createDate': '2019-02-27T18:53:16.380Z',
   'status': 'rejected',
   'recordId': '5',
   'createdBy': 'Buddy',
   'actions': [{'actor': 'Buddy',
     'actionType': 'review',
     'note': '444551233344',
     'actorName': 'Buddy',
     'createDate': '2019-02-27T18:53:16.380Z'},
    {'actor': 'Johnny',
     'actionType': 'reject',
     'note': '234',
     'actorName': 'Johnny',
     'createDate': '2019-02-27T19:00:46.425Z'}],
   'type': 'adjusted'}]
 'Count': 1,
 'ScannedCount': 1,
 'ResponseMetadata': {'RequestId': 'ced4a02e-f878-4edf-843a-2aabfadb0133',
  'HTTPStatusCode': 200,
  'HTTPHeaders': {'content-type': 'application/x-amz-json-1.0',
   'x-amz-crc32': '4260213483',
   'x-amzn-requestid': 'ced4a02e-f878-4edf-843a-2aabfadb0133',
   'content-length': '3360',
   'server': 'Jetty(8.1.12.v20130726)'},
  'RetryAttempts': 0}}

但是我只能得到一条记录(使用与上面相同的getRecordsById方法):

{{1}}

我的假设是我没有正确地使用put_item进行迭代,但是我找不到任何原因。

1 个答案:

答案 0 :(得分:0)

您可以迭代如下:

for item in response.get('Items'):
    print(item)

可以出于您的目的更改打印语句的地方,即

for item in response.get('Items'):
    table_local.put_item(
        Item=item
    )