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DocumentDB – 数据类型

JSON 或 JavaScript Object Notation 是一种轻量级的基于文本的开放标准，专为人类可读的数据交换而设计，也易于机器解析和生成。JSON 是 DocumentDB 的核心。我们通过网络传输 JSON，我们将 JSON 存储为 JSON，我们索引 JSON 树，允许对完整的 JSON 文档进行查询。

JSON 格式支持以下数据类型 –

S.No.	类型和描述
1	Number JavaScript 中的双精度浮点格式
2	String 带有反斜杠转义的双引号 Unicode
3	Boolean 对或错
4	Array 有序的值序列
5	Value 它可以是字符串、数字、真假、空值等。
6	Object 键值对的无序集合
7	Whitespace 它可以在任何一对令牌之间使用
8	Null 空的

让我们看一个简单的示例 DateTime 类型。将出生日期添加到客户类。

public class Customer {
   [JsonProperty(PropertyName = "id")] 
   public string Id { get; set; }
	
   // Must be nullable, unless generating unique values for new customers on client  
   [JsonProperty(PropertyName = "name")] 
   public string Name { get; set; }  
	
   [JsonProperty(PropertyName = "address")] 
   public Address Address { get; set; }  
	
   [JsonProperty(PropertyName = "birthDate")] 
   public DateTime BirthDate { get; set; } 
}

我们可以使用 DateTime 存储、检索和查询，如下面的代码所示。

private async static Task CreateDocuments(DocumentClient client) {
   Console.WriteLine(); 
   Console.WriteLine("**** Create Documents ****"); 
   Console.WriteLine();
	
   var document3Definition = new Customer { 
      Id = "1001", 
      Name = "Luke Andrew", 
		
      Address = new Address { 
         AddressType = "Main Office", 
         AddressLine1 = "123 Main Street", 
         Location = new Location {
            City = "Brooklyn",
            StateProvinceName = "New York" 
         }, 
         PostalCode = "11229",
         CountryRegionName = "United States" 
      },
		
      BirthDate = DateTime.Parse(DateTime.Today.ToString()), 
   };
	
   Document document3 = await CreateDocument(client, document3Definition); 
   Console.WriteLine("Created document {0} from typed object", document3.Id); 
   Console.WriteLine(); 
}

编译执行上述代码，创建文档后，你会看到现在添加了出生日期。

**** Create Documents ****  
Created new document: 1001 
{ 
   "id": "1001", 
   "name": "Luke Andrew", 
   "address": { 
      "addressType": "Main Office", 
      "addressLine1": "123 Main Street", 
      "location": { 
         "city": "Brooklyn", 
         "stateProvinceName": "New York" 
      }, 
      "postalCode": "11229", 
      "countryRegionName": "United States" 
   }, 
   "birthDate": "2015-12-14T00:00:00", 
   "_rid": "Ic8LAMEUVgAKAAAAAAAAAA==", 
   "_ts": 1450113676, 
   "_self": "dbs/Ic8LAA==/colls/Ic8LAMEUVgA=/docs/Ic8LAMEUVgAKAAAAAAAAAA==/", 
   "_etag": "\"00002d00-0000-0000-0000-566efa8c0000\"", 
   "_attachments": "attachments/" 
} 
Created document 1001 from typed object