c# - 从 c# 中的 cosmos db 获取给定查询字符串的数据

Question

我有以下函数来获取整个文档:

public async Task<IEnumerable<dynamic>> GetAllPreferences(string queryString)
        {
            IDocumentQuery<dynamic> query = documentClient.CreateDocumentQuery<dynamic>(
                UriFactory.CreateDocumentCollectionUri(collectionInfo.DatabaseName, collectionInfo.CollectionName))
                .AsDocumentQuery();

            List<dynamic> results = new List<dynamic>();
            while (query.HasMoreResults)
            {
                results.AddRange(await query.ExecuteNextAsync<dynamic>());
            }

            return results;
        }

但是在这里我无法使用queryString。 我的文档结构如下:

{
    "type": [
        "university",
        "institute"
    ],
    "preferences": [
        {
            "type": "university",
            "universityDetail": [
                .....
            ],
            "state" : [
                ....
            ]
        },
        {
            "type": "institute",
            "instituteDetail": [
                .....
            ],
            "state" : [
                ....
            ]
        }
    ]
}

我只能从每个文档中获取首选项。等效的 SQL 查询是“从collectionInfo.CollectionName中选择首选项”。

请建议代码编辑，并帮助我获得我的案例所需的确切查询字符串。

提前非常感谢。

Answer 1

您可以使用 SDK 尝试此代码:

public async Task<IEnumerable<dynamic>> GetAllPreferences(string queryString)
        {
            SqlQuerySpec queryStr = new SqlQuerySpec(queryString); //"select c.preferences from c"
            FeedOptions feedOptions = new FeedOptions();
            feedOptions.EnableCrossPartitionQuery = true;

            IDocumentQuery<dynamic> query = documentClient.CreateDocumentQuery(UriFactory.CreateDocumentCollectionUri(collectionInfo.DatabaseName, collectionInfo.CollectionName), queryString, feedOptions).AsDocumentQuery();

            List<dynamic> results = new List<dynamic>();
            while (query.HasMoreResults)
            {
                results.AddRange(await query.ExecuteNextAsync<dynamic>());
            }

            return results;
        }