如何查詢嵌入式數據documentDB以檢索父文檔

Question

在DocumentDb中，是否可以搜索子文檔以獲取父文檔？

public class Customer 
{ 
    [JsonProperty(PropertyName = "id")] 
    public string Id { get; set; } 

    [JsonProperty(PropertyName = "name")] 
    public string Name { get; set; } 

    [JsonProperty(PropertyName = "locations")] 
    public List<Location> Locations { get; set; } 

    public Customer() 
    { 
     Locations = new List<Location>(); 
    } 
} 

public class Location 
{ 
    [JsonProperty(PropertyName = "id")] 
    public string Id { get; set; } 

    [JsonProperty(PropertyName = "city")] 
    public string City{ get; set; } 

    [JsonProperty(PropertyName = "state")] 
    public string State{ get; set; } 

} 

在文檔資源管理器，我可以看到我有這個階級結構的一個實例，像這樣：

{ 
    "id": "7", 
    "name": "ACME Corp", 
    "location": [ 
    { 
     "id": "c4202793-da55-4324-88c9-b9c9fe8f4b6c", 
     "city": "newcity", 
     "state": "ca" 
    } 
    ] 
}, 
{ 
    "id": "35", 
    "name": "Another Corp", 
    "location": [ 
    { 
     "id": "d33e793-da55-4324-88c9-b9c9fe8f4baa", 
     "city": "newcity", 
     "state": "ca" 
    } 
    ] 
} 

有沒有一種方法來查詢等，其中城市=「newcity」嵌入數據和狀態=「ca」 但檢索父數據？如果我使用SelectMany（x => x.Locations）查詢子項，那麼它將獲取位置數據而不是根（客戶）文檔。

感謝

Answer 1

有沒有一種方法來查詢等，其中城市=「newcity」和狀態=「CA」，但檢索父數據嵌入的數據？

是的，我們可以使用加入做到這一點。更多詳情請參考Advanced database concepts and SQL queries。

SELECT c.id as id ,c.name as name,l as location from customer c Join l in 
c.location where l.city = 'newcity' and l.state = 'ca' 

它返回

C＃代碼演示：多

FeedOptions queryOptions = new FeedOptions { MaxItemCount = -1 }; 
var customerQuery = client.CreateDocumentQuery<dynamic>(
UriFactory.CreateDocumentCollectionUri(databaseName, collectionName), 
       "SELECT c.id as id, c.name as name, l as location from customer c Join l in c.location where l.city = 'newcity' and l.state = 'ca'", 
       queryOptions).AsDocumentQuery(); 

var customerList = new List<dynamic>(); 
while (customerQuery.HasMoreResults) 
{ 

    customerList.AddRange(customerQuery.ExecuteNextAsync<dynamic>().Result); 

}