Swift 3 AWS DynamoDB json響應反序列化

努力瞭解如何反序列化從AWS DynamoDB發送的json對象。我能夠成功調用dynamoDB.describeTable（describeTableInput！），並收到一份詳細的迴應......Swift 3 AWS DynamoDB json響應反序列化

2017-02-08 20:30:36.054 AWS_Test[84241:3626357] AWSiOSSDK v2.5.0 [Debug] AWSURLResponseSerialization.m line:63 | -[AWSJSONResponseSerializer responseObjectForResponse:originalRequest:currentRequest:data:error:] | Response body: 
{"Table":{"AttributeDefinitions":[{"AttributeName":"Author","AttributeType":"S"},{"AttributeName":"ISBN","AttributeType":"S"}],"CreationDateTime":1.486165623131E9,"GlobalSecondaryIndexes":[{"IndexArn":"arn:aws:dynamodb:ap-southeast-2:xxxxxxxxxxxxxxx:table/Books/index/ISBN-index","IndexName":"ISBN-index","IndexSizeBytes":94946,"IndexStatus":"ACTIVE","ItemCount":1780,"KeySchema":[{"AttributeName":"ISBN","KeyType":"HASH"}],"Projection":{"ProjectionType":"ALL"},"ProvisionedThroughput":{"NumberOfDecreasesToday":0,"ReadCapacityUnits":5,"WriteCapacityUnits":5}},{"IndexArn":"arn:aws:dynamodb:ap-southeast-2:xxxxxxxxxxxxxx:table/Books/index/Author-index","IndexName":"Author-index","IndexSizeBytes":94946,"IndexStatus":"ACTIVE","ItemCount":1780,"KeySchema":[{"AttributeName":"Author","KeyType":"HASH"}],"Projection":{"ProjectionType":"ALL"},"ProvisionedThroughput":{"NumberOfDecreasesToday":0,"ReadCapacityUnits":5,"WriteCapacityUnits":5}}],"ItemCount":1780,"KeySchema":[{"AttributeName":"ISBN","KeyType":"HASH"}],"ProvisionedThroughput":{"NumberOfDecreasesToday":0,"ReadCapacityUnits":5,"WriteCapacityUnits":5},"TableArn":"arn:aws:dynamodb:ap-southeast-2:xxxxxxxxxxxxxxxxx:table/Books","TableName":"Books","TableSizeBytes":94946,"TableStatus":"ACTIVE"}}

我的函數調用迪納摩...

func describeTable() { 

     let dynamoDB = AWSDynamoDB.default() 
     let describeTableInput = AWSDynamoDBDescribeTableInput() 
     describeTableInput?.tableName = "Books" 

     let tableDescription = dynamoDB.describeTable(describeTableInput!) as! AWSTask<AnyObject> 

     let jsonResult: NSDictionary = try JSONSerialization.JSONObjectWithData(Data, options: JSONSerialization.ReadingOptions.MutableContainers) as! NSDictionary 

     print(jsonResult.object(forKey: "ItemCount")!) 
     // let's dump everything to see what was returned 
     dump(tableDescription) 

    }

但我一直在努力幾天來試圖解決如何反序列化反應並存儲在我自己的字典中。

任何人都可以協助！？謝謝！

來源

2017-02-09 jasonb202020

您是否嘗試過使用SwiftyJSON library？第三方庫可以讓你避免大量頭痛，特別是在處理數據時。有了它，你的代碼看起來有點像：

let json = JSON(jsonResult) 
if let count = json["Table"]["GlobalSecondaryIndexes"]["ItemCount"].int { 
    print(count) //your count should be accessible here 
}

記住，JSON值是嵌套的，所以簡單地調用JSON [「ItemCount中」]將不會返回你期待什麼。

來源

2017-02-10 04:30:01 user7367181

挖掘和尖叫和挖掘和哭泣，我發現這裏的提示後：https://github.com/awslabs/aws-sdk-ios-samples/blob/master/DynamoDBObjectMapper-Sample/Swift/DynamoDBSampleSwift/DDBDynamoDBManager.swift

重構我的代碼讓我來訪問響應值..

func describeTable() { 
     let dynamoDB = AWSDynamoDB.default() 
     let describeTableInput = AWSDynamoDBDescribeTableInput() 
     describeTableInput?.tableName = "Books" 
     let describeTask = dynamoDB.describeTable(describeTableInput!) 

     var localTask:AWSTask<AnyObject>? 

     localTask = describeTask.continueOnSuccessWith(block: { task -> AnyObject? in 

      let describeTableOutput:AWSDynamoDBDescribeTableOutput = task.result! 
      let tableName = describeTableOutput.table!.tableName 
      let tableStatus = describeTableOutput.table!.tableStatus 
      let itemCount = describeTableOutput.table?.itemCount 

      print("--------------------------") 
      print(tableName! as String) 
      if tableStatus == AWSDynamoDBTableStatus.active { 
       print("Active") 
      } else { 
       print("Inactive") 
      } 
      print(itemCount as! Int) 
      print("--------------------------") 

      return localTask 
     }) 
    }

希望這可以幫助其他人！

來源

2017-02-15 10:50:26 jasonb202020

Swift 3 AWS DynamoDB json響應反序列化

回答

相關問題