在数据浏览器中运行时，使用SQL的Cosmos DB查询有效，但在C＃DocumentClient中执行时则无效

Question

我有一个查询，该查询用于计算特定类型的新旧文档的数量。

鉴于我试图在一个查询中获取一种以上类型的计数这一事实，很有可能应该重写查询，并且新版本可以在使用C＃时按预期工作。

如果我使用“ New SQL Query”在Cosmos DB Data Explorer中运行查询，则该查询有效，但是当使用2.2.2和2.8.1（升级到最新版本）版本运行相同的查询时Microsoft.Azure.DocumentDB.Core nuget包中的DocumentClient中没有。

提供以下文件：

数据

[{
    "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
}]

以及以下查询：

查询

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Data Explorer中基于Web的查询编辑器中运行此查询时，结果符合预期。

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

如果我使用C＃尝试相同的查询，则DocumentClient的所有值均为0。返回动态结果和键入结果时都是这种情况。

C＃类型的查询示例

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; }
}

预期结果：

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

使用C＃执行查询时的结果：

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

Answer 1

您的C＃查询不相同。在Portal查询中，您正在执行c.SomeKey = 'foo'，而在C＃中，您正在执行c.Type = '@foo'

最后，从查询参数中删除'，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";