Azure学习笔记：Storage（3）

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Azure的Storage为我们提供了三种类型的存储结构：Blob类型，Table类型，Queue类型。Blob类型的存储结构非常适合储存文件资料，例如图片或者是文档什么的。Table类型的结构和传统的关系数据库系统中的Table还是有比较大的差别，这里的Table更像C#中的锯齿数组：每行的列都可以自由定制，非常方便。

Blob

在使用Blob的时候，我们需要先创建一个Container，Container有公有和私有之分。它们的功能故名思意都是用来做访问控制的。下面的代码片段演示怎么在Client端调将文件上传至Azure的Blob上。

Common

        private string storageConnStr = @"DefaultEndpointsProtocol=https;AccountName=ghstorage01;AccountKey=MM2FlgiOMSEpgtcJr65l6/0evAgT8ulIJCVfXAJva7jsFj1Tj6TbN2Imh1/xkhcToeMS64X6DbSRthRGs9IBuw==";        private CloudStorageAccount storageAccount;

Upload

        private void button1_Click(object sender, EventArgs e)        {            storageAccount = CloudStorageAccount.Parse(storageConnStr);            //storageAccount = CloudStorageAccount.DevelopmentStorageAccount;            CloudBlobClient client = storageAccount.CreateCloudBlobClient();            CloudBlobContainer container = client.GetContainerReference("pcontainer01");            container.CreateIfNotExists();            CloudBlockBlob blob = container.GetBlockBlobReference(textBox1.Text);            FileStream fs = File.OpenRead(textBox1.Text);            blob.UploadFromStream(fs);            fs.Close();            MessageBox.Show("done");        }

Download

        private void button2_Click(object sender, EventArgs e)        {            storageAccount = CloudStorageAccount.Parse(storageConnStr);            CloudBlobClient client= storageAccount.CreateCloudBlobClient();            CloudBlobContainer container = client.GetContainerReference("pcontainer01");            Uri fileUri = new Uri(@"http://ghstorage01.blob.core.windows.net/pcontainer01/C:/Users/v-jexion/Pictures/email/20140103-153640-0001.png");            CloudBlockBlob blockBlob = new CloudBlockBlob(fileUri, new StorageCredentials(storageConnStr));            blockBlob.DownloadToFile(@"d:\tmp.jpg", FileMode.Create);                                }

Delete

       private void button3_Click(object sender, EventArgs e)        {            storageAccount = CloudStorageAccount.Parse(storageConnStr);            CloudBlobClient client = storageAccount.CreateCloudBlobClient();            CloudBlobContainer container = client.GetContainerReference("pcontainer01");            var blob=container.GetBlockBlobReference("C:/Users/v-jexion/Pictures/email/20140103-153640-0001.png");            blob.Delete();        }

Table

在之前已经介绍过Azure上的Table，在这里它更像是一个对象池，用来保存不同的对象。下面贴一个简单使用它的小例子：使用Azure Table保存员工的信息，并将它绑定到数据呈递控件。

Common

private string accountConnectionString = @"DefaultEndpointsProtocol=https;AccountName=ghstorage01;AccountKey=MM7FlgiOMSEpgtcJr65l6/0evAgT8ulIJCVfXAJva7jsFj1Tj6TbN2Imh1/xkhcToeMS64X6DbSRthRGs9IBuw==";        CloudStorageAccount account; public class EmployeeEntity : TableEntity        {            public EmployeeEntity() { }            public EmployeeEntity(string city, string id)            {                this.PartitionKey = city;                this.RowKey = id;            }            public string Name { get; set; }            public int Age { get; set; }                  public string Country { get; set; }        }

Create Table

        private void btnCreateTable_Click(object sender, EventArgs e)        {            account = CloudStorageAccount.Parse(accountConnectionString);            CloudTableClient client=account.CreateCloudTableClient();            CloudTable table=client.GetTableReference("Employees");            table.CreateIfNotExists();            EmployeeEntity e1=new EmployeeEntity("Beijin","101"){ Name="jeff", Age=27};            TableOperation insertOpt=TableOperation.Insert(e1);            table.Execute(insertOpt);            MessageBox.Show("done");        }

Query Table

        private void btnQuery_Click(object sender, EventArgs e)        {            account = CloudStorageAccount.Parse(accountConnectionString);            CloudTableClient client = account.CreateCloudTableClient();            CloudTable table = client.GetTableReference("Employees");            table.CreateIfNotExists();            TableQuery<EmployeeEntity> t = new TableQuery<EmployeeEntity>();            var result = t.Where(TableQuery.GenerateFilterCondition("PartitionKey", QueryComparisons.Equal, "Beijin"));            var list = table.ExecuteQuery(result).ToList();            dataGridView1.DataSource = list;                    }

Update Item

        private void btnUptdate_Click(object sender, EventArgs e)        {            account = CloudStorageAccount.Parse(accountConnectionString);            CloudTableClient client = account.CreateCloudTableClient();            CloudTable table = client.GetTableReference("Employees");            table.CreateIfNotExists();            TableQuery<EmployeeEntity> t = new TableQuery<EmployeeEntity>();            var result = t.Where(TableQuery.GenerateFilterCondition("PartitionKey", QueryComparisons.Equal, "Beijin"));            var item = table.ExecuteQuery(result).FirstOrDefault();            if (item != null)            {                item.Name += DateTime.Now.ToShortDateString();                TableOperation o = TableOperation.Merge(item);                table.Execute(o);            }        }

Delete Item

        private void btnDelete_Click(object sender, EventArgs e)        {            account = CloudStorageAccount.Parse(accountConnectionString);            CloudTableClient client = account.CreateCloudTableClient();            CloudTable table = client.GetTableReference("Employees");            table.CreateIfNotExists();            TableQuery<EmployeeEntity> t = new TableQuery<EmployeeEntity>();            var result = t.Where(TableQuery.GenerateFilterCondition("PartitionKey", QueryComparisons.Equal, "Beijin"));            var item = table.ExecuteQuery(result).FirstOrDefault();            if (item != null)            {                TableOperation o = TableOperation.Delete(item);                table.Execute(o);            }        }

Queue

队列，这里的队列是从数据存储的意义上去定义的，也就是队列类型的数据结构。用户可以使用这种数据结构来处理特殊的业务场景，比如日常任务队列，异常信息队列等等。

            cloudAcc = CloudStorageAccount.Parse(storageConnStr);            CloudQueueClient queueClient = cloudAcc.CreateCloudQueueClient();                        //create queue            CloudQueue queue = queueClient.GetQueueReference("ghstorage01"); // new CloudQueue(new Uri("http://ghstorage01.queue.core.windows.net/"));            queue.CreateIfNotExists();            //enqueue            if (queue != null)            {                 CloudQueueMessage msg=new CloudQueueMessage("hello storage queue");                       queue.AddMessage(msg);                                            }            //dequeue            CloudQueueMessage msg2 = queue.GetMessage();            if (msg2 != null)            {                MessageBox.Show(msg2.AsString);            }

Azure Storage Explorer

该工具是款开源的辅助工具，用它可以浏览Azure Storage上保存的数据，是款不错的UI工具。

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