使用 SQL 的 Cosmos DB 查詢在數據資源管理器中運行時有效，但在使用 C# DocumentClient 執行時無效

Question

我有一個查詢，旨在計算特定類型的新鮮和陳舊文檔的數量。

鑒於我嘗試在一個查詢中獲取多個類型的計數，因此很有可能應該重寫查詢，並且新版本在使用 C# 時按預期工作。

如果我使用“新 SQL 查詢”在 Cosmos DB 數據資源管理器中運行該查詢，但是當使用Microsoft.Azure.DocumentDB.Core中 DocumentClient 的2.2.2和2.8.1 （升級到最新版本）版本運行相同的查詢時。 Microsoft.Azure.DocumentDB.Core nuget package 它沒有。

鑒於以下文件：

數據

[{
    "PartitionKey": "partition",
    "SomeKey": "foo",
    "Type": "DocumentType",
    "Value": "1",
    "StaleAfterThis": 101
},
{
    "PartitionKey": "partition",
    "SomeKey": "bar",
    "Type": "DocumentType",
    "Value": "2",
    "StaleAfterThis": 90
},
{
    "PartitionKey": "partition",
    "SomeKey": "bar",
    "Type": "DocumentType",
    "Value": "3",
    "StaleAfterThis": 500
},
{
    "PartitionKey": "partition",
    "SomeKey": "foo",
    "Type": "DocumentType",
    "Value": "4",
    "StaleAfterThis": 500
}]

以及以下查詢：

詢問

SELECT
    SUM((SELECT VALUE Count(1) WHERE c.SomeKey = 'foo' AND c.PartitionKey = 'partition' AND c.StaleAfterThis < 100)) as StaleFooCount,
    SUM((SELECT VALUE Count(1) WHERE c.SomeKey = 'foo' AND c.PartitionKey = 'partition' AND c.StaleAfterThis >= 100)) as FreshFooCount,
    SUM((SELECT VALUE Count(1) WHERE c.SomeKey = 'bar' AND c.PartitionKey = 'partition' AND c.StaleAfterThis < 100)) as StaleBarCount,
    SUM((SELECT VALUE Count(1) WHERE c.SomeKey = 'bar' AND c.PartitionKey = 'partition' AND c.StaleAfterThis >= 100)) as FreshBarCount
FROM c
WHERE
    c.Type = 'DocumentType' AND
    c.PartitionKey = 'partition'

在數據資源管理器中基於 web 的查詢編輯器中運行此查詢時，結果符合預期。

[
    {
        "StaleFooCount": 0,
        "FreshFooCount": 1,
        "StaleBarCount": 1,
        "FreshBarCount": 1
    }
]

如果我使用 C# 嘗試相同的查詢，則 DocumentClient 的所有值都是 0。返回動態結果和鍵入結果時都是這種情況。

C# 類型化查詢示例

var queryOptions = new FeedOptions { MaxItemCount = 1 };

var queryText =
    @"SELECT
        SUM((SELECT VALUE Count(1) WHERE c.SomeKey = '@foo' AND c.PartitionKey = '@partitionKey' AND c.StaleAfterThis < @staleAfterThis)) as StaleFooCount,
        SUM((SELECT VALUE Count(1) WHERE c.SomeKey = '@foo' AND c.PartitionKey = '@partitionKey' AND c.StaleAfterThis >= @staleAfterThis)) as FreshFooCount,
        SUM((SELECT VALUE Count(1) WHERE c.SomeKey = '@bar' AND c.PartitionKey = '@partitionKey' AND c.StaleAfterThis < @staleAfterThis)) as StaleBarCount,
        SUM((SELECT VALUE Count(1) WHERE c.SomeKey = '@bar' AND c.PartitionKey = '@partitionKey' AND c.StaleAfterThis >= @staleAfterThis)) as FreshBarCount
    FROM c
    WHERE
        c.Type = 'DocumentType' AND
        c.PartitionKey = '@partitionKey'";

var queryParameters = new SqlParameterCollection
{
    new SqlParameter("@partitionKey", "partition"),
    new SqlParameter("@foo", FooBarEnum.Foo.ToString()),
    new SqlParameter("@bar", FooBarEnum.Bar.ToString()),
    new SqlParameter("@staleAfterThis", 100)
};

var sqlQuerySpec = new SqlQuerySpec(queryText, queryParameters);

var query = _client.CreateDocumentQuery<TempResult>(_collectionLink, sqlQuerySpec, queryOptions).AsDocumentQuery();

var totalStaleDocuments = new TempResult();

while (query.HasMoreResults)
{
    foreach (var result in await query.ExecuteNextAsync<TempResult>())
    {
        totalStaleDocuments.FreshFooCount += result.FreshFooCount;
        totalStaleDocuments.StaleFooCount += result.StaleFooCount;
        totalStaleDocuments.FreshBarCount += result.FreshBarCount;
        totalStaleDocuments.StaleBarCount += result.StaleBarCount;
    }
}

public class TempResult
{
    public int StaleFooCount { get; set; }
    public int FreshFooCount { get; set; }
    public int StaleBarCount { get; set; }
    public int FreshBarCount { get; set; }
}

預期結果：

[
    {
        "StaleFooCount": 0,
        "FreshFooCount": 1,
        "StaleBarCount": 1,
        "FreshBarCount": 1
    }
]

使用 C# 執行查詢時的結果：

[
    {
        "StaleFooCount": 0,
        "FreshFooCount": 0,
        "StaleBarCount": 0,
        "FreshBarCount": 0
    }
]

Answer 1

您的 C# 查詢不一樣。 在您的門戶查詢中，您正在執行c.SomeKey = 'foo'而在 C# 中，您正在執行c.Type = '@foo'

最后，從查詢參數中刪除' ，如下所示：

 var queryText =
            @"SELECT
        SUM((SELECT VALUE Count(1) WHERE c.SomeKey  = @foo AND c.PartitionKey = @partitionKey AND c.StaleAfterThis < @staleAfterThis)) as StaleFooCount,
        SUM((SELECT VALUE Count(1) WHERE c.SomeKey  = @foo AND c.PartitionKey = @partitionKey AND c.StaleAfterThis >= @staleAfterThis)) as FreshFooCount,
        SUM((SELECT VALUE Count(1) WHERE c.SomeKey  = @bar AND c.PartitionKey = @partitionKey AND c.StaleAfterThis < @staleAfterThis)) as StaleBarCount,
        SUM((SELECT VALUE Count(1) WHERE c.SomeKey  = @bar AND c.PartitionKey = @partitionKey AND c.StaleAfterThis >= @staleAfterThis)) as FreshBarCount
    FROM c
    WHERE
        c.Type = 'DocumentType' AND
        c.PartitionKey = @partitionKey";