使用DynamoDBContext查詢.NET中的DynamoDB查詢<T> with QueryOperator vs QueryFilter with List <ScanCondition>

Question

我試圖使用具有HashKey和RangeKey的全局二級索引來查詢DynamoDB表。

我想要QUERYIndexCustomerId由CustomerId和DateTime範圍（從 - 到）。沒有選項將Index RangeKey設置爲DateTime。唯一的選擇是：String,Number和Binary。

我正在使用C＃對象持久性模型Amazon.DynamoDBv2.DataModel .NET Framework v3.5上的API。

表：

+-------------------+----------+---------------------------+----------------+------------+ 
| InputFlowCode  | Counter | OrderIssueDate   | OrderTypeCode | CustomerId | 
+-------------------+----------+---------------------------+----------------+------------+ 
| bac9-35df6ac533fc | 000004 | 2016-07-19T22:00:00.000Z | 220   | 123  | 
+-------------------+----------+---------------------------+----------------+------------+ 
| a3db-9d6f56a5c611 | 000006 | 2016-06-30T22:00:00.000Z | 220   | 456  | 
+-------------------+----------+---------------------------+----------------+------------+ 
| af1c-db5b089c1e32 | 000010 | 2016-07-02T22:00:00.000Z | 220   | 789  | 
+-------------------+----------+---------------------------+----------------+------------+ 
| ...    | ...  | ...      | ...   | ...  | 
+-------------------+----------+---------------------------+----------------+------------+ 

全球二級索引定義：

IndexCustomerId: 
- CustomerId (integer), 
- OrderIssueDate (DateTime on model, but string on Index definition) 

代碼：

try 
{ 
    DateTime dateFrom = new DateTime(2016, 08, 01); 
    DateTime dateTo = new DateTime(2016, 08, 15); 

    List<MyDynamoDBItem> items = new List<MyDynamoDBItem>(); 

    DynamoDBOperationConfig operationConfig = new DynamoDBOperationConfig(); 
    operationConfig.OverrideTableName = "Transactions"; 
    operationConfig.IndexName = "IndexCustomerId"; 

    DynamoDBContext context = new DynamoDBContext(DynamoDBClient); 

    // 1) Works 
    items = context.Query<MyDynamoDBItem>(customerId, operationConfig).OrderByDescending(o => o.OrderIssueDate).ToList(); 

    // 2) Doesn't work 
    items = context.Query<MyDynamoDBItem>(customerId, QueryOperator.Between, dateFrom, dateTo, operationConfig).OrderByDescending(o => o.OrderIssueDate).ToList(); 

    // 3) Works, but I don't know if it is the right choice... 
    List<ScanCondition> conditions = new List<ScanCondition>(); 
    conditions.Add(new ScanCondition(PeppolOrdineDynamoDBTableAttributes.OrderIssueDate, ScanOperator.Between, dateFrom, dateTo)); 
    operationConfig.QueryFilter = conditions; 
    items = context.Query<MyDynamoDBItem>(customerId, operationConfig).OrderByDescending(o => o.OrderIssueDate).ToList(); 
} 
catch (Exception) 
{ 
    throw; 
} 

ŧ他第一個查詢沒有參數的作品。

的第二查詢與Between操作員和2 DateTime拋出Exception：

{"Cannot cast objects of type 'System.Int32' to type 'System.String'."} 

的第三個查詢使用QueryFilter是一個列表和ScanOperator工作過，但我不知道知道QueryOperator有什麼區別，如果這是正確的選擇，因爲我想製作一個QUERY而不是SCAN。

Answer 1

我有同樣的問題，但我使用greaterThan，我發現將參數值添加到對象數組固定它。

因此，也許是這樣的：

items = context.Query<MyDynamoDBItem>(customerId, QueryOperator.Between, new object[] {dateFrom, dateTo}, operationConfig).OrderByDescending(o => o.OrderIssueDate).ToList();