Cosmos DB 数组查询在 .NET SDK 中不起作用

Question

我正在尝试获取容器中使用的所有不同类别值，其中类别是一个字符串数组。

查看 Cosmos DB SQL 文档，我构建了以下查询，当我执行 SQL 和 returns 不同类别的数组时，它在模拟器中工作预期。

SELECT DISTINCT * FROM c IN s.categories

结果

[
    "Running",
    "Rugby",
    "Icon"
]

但是，如果我通过 Cosmos .NET SDK 使用相同的查询，我会收到错误消息

"Identifier 'session' could not be resolved."

为什么这个查询可以在模拟器中运行，但不能通过 SDK 运行？是我做错了什么还是 SDK 有问题？

示例数据：

{
"name": "Sample Entity",
"description": "<p></p>",
"startDateUtc": "2020-07-13T19:10:00Z",
"endDateUtc": "2020-07-13T20:00:00Z",
"categories": [
    "Running",
    "Icon"
],
"id": "h3foyhfk0a3betj1",
"dateCreated": "2020-07-15T06:33:57.9406583Z",
"lastUpdated": "2020-08-13T17:04:18.6182079Z" }

SDK代码：

var query = new QueryDefinition("SELECT DISTINCT * FROM c IN s.categories");
var results = new List<TEntity>();
            
var resultSetIterator = _container.GetItemQueryIterator<TEntity>(query, requestOptions: new QueryRequestOptions() { PartitionKey = new PartitionKey(partitionKey) });
while (resultSetIterator.HasMoreResults)
{
      var response = await resultSetIterator.ReadNextAsync();
      results.AddRange(response);
      if (response.Diagnostics != null)
      {
           _logger.LogTrace($"\nQueryWithSqlParameters Diagnostics: {response.Diagnostics}");
      }
}

return results;

Answer 1

移除 , requestOptions: new QueryRequestOptions() { PartitionKey = new PartitionKey(partitionKey).

然后你就会得到结果。你用的时候requestOptions可能有错误。

var query = new QueryDefinition("SELECT DISTINCT * FROM c IN s.categories");
var results = new List<dynamic>();

var resultSetIterator = container.GetItemQueryIterator<dynamic>(query);
while (resultSetIterator.HasMoreResults)
{
    var response = await resultSetIterator.ReadNextAsync();
    results.AddRange(response);
    if (response.Diagnostics != null)
    {
        Console.WriteLine($"\nQueryWithSqlParameters Diagnostics: {response.Diagnostics}");
    }
}

Cosmos DB 数组查询在 .NET SDK 中不起作用

Cosmos DB Array Query Doesn't Work in .NET SDK

azure-cosmosdb

azure-cosmosdb-sqlapi