DocumentDB 删除集合
要删除一个或多个集合，您可以使用 .Net SDK 从门户和代码中执行相同的操作。
步骤 1-转到 Azure 门户上的 DocumentDB 帐户。出于演示目的，我添加了另外两个集合，如下面的屏幕截图所示。
第 2 步-要删除任何集合，您需要单击该集合。让我们选择 TempCollection1、您将看到以下页面，选择"删除Collection"选项。
第 3 步-它将显示确认消息。现在点击"是"按钮。
您将看到 TempCollection1 在您的仪表板上不再可用。
您还可以使用 .Net SDK 从您的代码中删除集合。为此，请执行以下步骤。
步骤 1-让我们通过指定要删除的集合的 ID 来删除集合。
这是通过Id查询获取删除资源所需的selfLinks的常用模式。
private async static Task DeleteCollection(DocumentClient client, string collectionId) {
Console.WriteLine();
Console.WriteLine("**** Delete Collection {0} in {1} ****", collectionId, database.Id);
var query = new SqlQuerySpec {
QueryText = "SELECT * FROM c WHERE c.id = @id",
Parameters = new SqlParameterCollection {
new SqlParameter {
Name = "@id", Value = collectionId
}
}
};
DocumentCollection collection = client.CreateDocumentCollectionQuery(database.SelfLink,
query).AsEnumerable().First();
await client.DeleteDocumentCollectionAsync(collection.SelfLink);
Console.WriteLine("Deleted collection {0} from database {1}", collectionId,
database.Id);
}
这里我们看到了构建参数化查询的首选方式。我们没有对 collectionId 进行硬编码，因此此方法可用于删除任何集合。我们正在通过 Id 查询特定集合，其中 Id 参数在此 SqlParameterCollection 中定义，该 SqlParameterCollection 分配给此 SqlQuerySpec 的参数属性。
然后，SDK 会为 DocumentDB 构建最终查询字符串，并将 collectionId 嵌入其中。
步骤 2-运行查询，然后使用其 SelfLink 从 CreateDocumentClient 任务中删除集合。
private static async Task CreateDocumentClient() {
// Create a new instance of the DocumentClient
using (var client = new DocumentClient(new Uri(EndpointUrl), AuthorizationKey)) {
database = client.CreateDatabaseQuery("SELECT * FROM c WHERE c.id =
'myfirstdb'").AsEnumerable().First();
await DeleteCollection(client, "TempCollection");
}
}
以下是 Program.cs 文件的完整实现。
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Microsoft.Azure.Documents;
using Microsoft.Azure.Documents.Client;
using Microsoft.Azure.Documents.Linq;
using Newtonsoft.Json;
namespace DocumentDBDemo {
class Program {
private const string EndpointUrl = "https://azuredocdbdemo.documents.azure.com:443/";
private const string AuthorizationKey = "BBhjI0gxdVPdDbS4diTjdloJq7Fp4L5RO/
StTt6UtEufDM78qM2CtBZWbyVwFPSJIm8AcfDu2O+AfV T+TYUnBQ==";
private static Database database;
static void Main(string[] args) {
try {
CreateDocumentClient().Wait();
} catch (Exception e) {
Exception baseException = e.GetBaseException();
Console.WriteLine("Error: {0}, Message: {1}", e.Message, baseException.Message);
}
Console.ReadKey();
}
private static async Task CreateDocumentClient() {
// Create a new instance of the DocumentClient
using (var client = new DocumentClient(new Uri(EndpointUrl), AuthorizationKey)) {
database = client.CreateDatabaseQuery("SELECT * FROM c WHERE c.id =
'myfirstdb'").AsEnumerable().First();
await DeleteCollection(client, "TempCollection");
//await CreateCollection(client, "MyCollection1");
//await CreateCollection(client, "MyCollection2", "S2");
////await CreateDatabase(client);
//GetDatabases(client);
//await DeleteDatabase(client);
//GetDatabases(client);
}
}
private async static Task CreateCollection(DocumentClient client,
string collectionId, string offerType = "S1") {
Console.WriteLine();
Console.WriteLine("**** Create Collection {0} in {1} ****", collectionId,
database.Id);
var collectionDefinition = new DocumentCollection { Id = collectionId };
var options = new RequestOptions { OfferType = offerType };
var result = await client.CreateDocumentCollectionAsync(database.SelfLink,
collectionDefinition, options);
var collection = result.Resource;
Console.WriteLine("Created new collection");
ViewCollection(collection);
}
private static void ViewCollection(DocumentCollection collection) {
Console.WriteLine("Collection ID: {0} ", collection.Id);
Console.WriteLine("Resource ID: {0} ", collection.ResourceId);
Console.WriteLine("Self Link: {0} ", collection.SelfLink);
Console.WriteLine("Documents Link: {0} ", collection.DocumentsLink);
Console.WriteLine("UDFs Link: {0} ", collection.UserDefinedFunctionsLink);
Console.WriteLine("StoredProcs Link: {0} ", collection.StoredProceduresLink);
Console.WriteLine("Triggers Link: {0} ", collection.TriggersLink);
Console.WriteLine("Timestamp: {0} ", collection.Timestamp);
}
private async static Task DeleteCollection(DocumentClient client,
string collectionId) {
Console.WriteLine();
Console.WriteLine("**** Delete Collection {0} in {1} ****", collectionId,
database.Id);
var query = new SqlQuerySpec {
QueryText = "SELECT * FROM c WHERE c.id = @id", Parameters = new
SqlParameterCollection {
new SqlParameter {
Name = "@id", Value = collectionId
}
}
};
DocumentCollection collection = client.CreateDocumentCollectionQuery
(database.SelfLink, query).AsEnumerable().First();
await client.DeleteDocumentCollectionAsync(collection.SelfLink);
Console.WriteLine("Deleted collection {0} from database {1}", collectionId,
database.Id);
}
}
}
当上面的代码编译执行后，你会得到如下输出。
**** Delete Collection TempCollection in myfirstdb ****
Deleted collection TempCollection from database myfirstdb
