Question

我有一个使用Windows Azure Storage Client 3.0的基本Azure表存储查询。将此转换为异步查询的最简单方法是什么？是否可以使用异步等待模式？

//Setup the storage account connection
var cloudStorageAccount = CloudStorageAccount.Parse(connectionString);
var cloudTableClient = cloudStorageAccount.CreateCloudTableClient();
var table = cloudTableClient.GetTableReference("SampleTable");

//Get the context
var context = cloudTableClient.GetTableServiceContext();

//Setup the query
var q = from s in table.CreateQuery<SampleEntity>()
        where s.PartitionKey == sampleUID.ToString()
        select s;

//Get the list
var list = q.ToList();

插入和更新实体有XyzAsync（）方法......我必须遗漏一些东西。谢谢你的帮助。

Answer 1

最新版本的SDk现在支持异步（nuget）。

您可以使用ExecuteSegmentedAsync方法执行查询：

var query = (from s in table.CreateQuery<SampleEntity>()
            where s.PartitionKey == sampleUID.ToString() select s)
            .AsTableQuery<SampleEntity>();

TableContinuationToken continuationToken = null;
do
{
    // Execute the query async until there is no more result
    var queryResult = await query.ExecuteSegmentedAsync(continuationToken);
    foreach (var entity in queryResult)
    {

    }

    continuationToken = queryResult.ContinuationToken;
} while (continuationToken != null);

我已经转换了本教程的一些示例（How to use Table storage from .NET）：

创建表格

async Task CreateATable()
{
    // Retrieve the storage account from the connection string.
    CloudStorageAccount storageAccount = CloudStorageAccount.Parse(
        CloudConfigurationManager.GetSetting("StorageConnectionString"));

    // Create the table client.
    CloudTableClient tableClient = storageAccount.CreateCloudTableClient();

    // Create the table if it doesn't exist.
    CloudTable table = tableClient.GetTableReference("people");
    await table.CreateIfNotExistsAsync();
}

将实体添加到表格

public class CustomerEntity : TableEntity
{
    public CustomerEntity(string lastName, string firstName)
    {
        this.PartitionKey = lastName;
        this.RowKey = firstName;
    }

    public CustomerEntity() { }

    public string Email { get; set; }

    public string PhoneNumber { get; set; }
}
...
//The script:
// Retrieve the storage account from the connection string.
CloudStorageAccount storageAccount = CloudStorageAccount.Parse(
    CloudConfigurationManager.GetSetting("StorageConnectionString"));

// Create the table client.
CloudTableClient tableClient = storageAccount.CreateCloudTableClient();

// Create the CloudTable object that represents the "people" table.
CloudTable table = tableClient.GetTableReference("people");

// Create a new customer entity.
CustomerEntity customer1 = new CustomerEntity("Harp", "Walter");
customer1.Email = "Walter@contoso.com";
customer1.PhoneNumber = "425-555-0101";

// Create the TableOperation object that inserts the customer entity.
TableOperation insertOperation = TableOperation.Insert(customer1);

// Execute the insert operation.
await table.ExecuteAsync(insertOperation);

插入一批实体

// Retrieve the storage account from the connection string.
CloudStorageAccount storageAccount = CloudStorageAccount.Parse(
    CloudConfigurationManager.GetSetting("StorageConnectionString"));

// Create the table client.
CloudTableClient tableClient = storageAccount.CreateCloudTableClient();

// Create the CloudTable object that represents the "people" table.
CloudTable table = tableClient.GetTableReference("people");

// Create the batch operation.
TableBatchOperation batchOperation = new TableBatchOperation();

// Create a customer entity and add it to the table.
CustomerEntity customer1 = new CustomerEntity("Smith", "Jeff");
customer1.Email = "Jeff@contoso.com";
customer1.PhoneNumber = "425-555-0104";

// Create another customer entity and add it to the table.
CustomerEntity customer2 = new CustomerEntity("Smith", "Ben");
customer2.Email = "Ben@contoso.com";
customer2.PhoneNumber = "425-555-0102";

// Add both customer entities to the batch insert operation.
batchOperation.Insert(customer1);
batchOperation.Insert(customer2);

// Execute the batch operation.
await table.ExecuteBatchAsync(batchOperation);

依此类推......

Answer 2

查看来自Azure存储团队的以下Tables Deep Dive博客文章。新的表服务层包括异步操作，例如与异步等待模式一起使用的ExecuteQueryAsync（与同步ExecuteQuery方法相对应）。另请阅读Storage Library 2.1 Release帖子，了解有关使用新的表服务器层的IQueryable支持的更多信息。

杰森

执行异步查询Azure表存储的最佳方法

2 个答案: