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CHAPTER 1 CREATE CLOUD TABLE STORAGE
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public interface INoDependencyTableService : IDataTableService { } } using using using using System; System.Collections.Generic; System.Linq; System.Text;
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namespace CreateDataStorage.Models.CloudDataServices { using Microsoft.Samples.ServiceHosting.StorageClient; using CreateDataStorage.Models.CloudDataContext; abstract public class DataTableService { protected UserDataContext _userDataContext = null; protected string _Table { get; set; } public DataTableService() { _userDataContext = new UserDataContext(); } public UserDataContext DataContext() { return _userDataContext; } virtual public bool Insert(TableStorageEntity entity) { bool success = false; try { if (this is IHasDependencyTableService) { (this as IHasDependencyTableService).UpdateDependencyTable(entity); } _userDataContext.AddObject(_Table, entity); _userDataContext.SaveChanges(); success = true; } catch { } return success; } public bool Update(TableStorageEntity entity) { bool success = false; try
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CHAPTER 1 CREATE CLOUD TABLE STORAGE
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{ if (Delete(entity)) { success = Insert(entity); } } catch { } return success; } virtual public bool Delete(TableStorageEntity entity) { bool success = false; try { if (this is IHasDependencyTableService) { (this as IHasDependencyTableService).UpdateDependencyTable(entity); } _userDataContext.DeleteObject(entity); _userDataContext.SaveChanges(); success = true; } catch { } return success; } } } using using using using using System; System.Collections.Generic; System.Linq; System.Text; System.Configuration;
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namespace CreateDataStorage.Models.CloudDataServices { using Microsoft.Samples.ServiceHosting.StorageClient; using CreateDataStorage.Models.CloudData; public class AddressTableService : DataTableService, INoDependencyTableService { public AddressTableService() { _Table = ConfigurationManager.AppSettings["AddressTable"]; } } }
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CHAPTER 1 CREATE CLOUD TABLE STORAGE
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In the same project, add the class UserDataContext, derived from the Azure SDK base class TableStorageDataServiceContext. This class encapsulates a cloud storage query function as Listing 1-5 shows.
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Listing 1-5. Class UserDataContext Definition public class UserDataContext : TableStorageDataServiceContext { public DataServiceQuery<Address> AddressTable { get { return CreateQuery<Address>(ConfigurationManager.AppSettings["AddressTable"]); } } } 7. Right-click on the CreateDataStorage project node in the Solution Explorer panel to bring up the Property dialog box. Select Development in the left pane. Enter the database name, AzureForDotNetDeveloper, into the dialog box, as Figure 1-4 shows.
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Figure 1-4. Enter data table name 8. 9. Add a reference to CloudData.Models.dll to the CloudStorageService_WorkerRole project. Right-click on the CreateDataStorage project and select Create Test Storage Table as Figure 1-5 shows. The compiler will analyze the code and generate a table for the database. The generated table in the database is shown in Figure 1-6.
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CHAPTER 1 CREATE CLOUD TABLE STORAGE
Figure 1-5. Generate SQL storage
Figure 1-6. Data table has been generated in local SQL database
CHAPTER 1 CREATE CLOUD TABLE STORAGE
When development storage is created the first time, message boxes will be popped up as shown in Figure 1-7 and Figure 1-8. The local development storage and development fabric can be manually started from the Windows Start menu as Figure 1-9 shows. Figure 1-10 and Figure 1-11 show the results of these services having been successfully started from the local development environment.
Figure 1-7. Dialog message to confirm installation of development storage
Figure 1-8. Confirming the settings using the default endpoint address for development storage the first time local development storage is used
CHAPTER 1 CREATE CLOUD TABLE STORAGE
Figure 1-9. Manually starting local development storage and development fabric
Figure 1-10. Opening the information window to verify current status of the development fabric
Figure 1-11. Right-clicking on the development storage icon to shut down the development fabric
CHAPTER 1 CREATE CLOUD TABLE STORAGE
This exercise demonstrates the basic steps to create a cloud data storage table using Windows Azure SDK development storage table service. In principle, the approach is fairly straightforward. However, in practice, since storage usage in a cloud environment is quite different from that in the regular onpremises environment, we should follow some rules and best practices.
Using Portable Data Types for Data Columns
Essentially, the data type of a data column should be portable to a SQL data type, or be able to be understood as a system-defined basic data type.
Using Data Tables Generated by Windows Azure Development Tool
Use the Azure development tool provided by the Azure development SDK to invoke the development storage service from Visual Studio to generate the data storage database and data tables. The development tool analyzes the data objects of all projects across the cloud application solution to generate the data structure for you. The number of data tables equals the number of data entity classes that derive from the TableStorageEntity class. The number of columns in a generated data table equals the number of public access properties defined in that data entity class.
Solutions to Non-Portable Data Types
If the data type is a custom-defined type, the SDK development tools will fail to invoke DevelopmentStorage.exe and DevtableGen.exe. The following example illustrates how to solve this problem if we have to use a data column in a data table with a custom-defined type, generally an embedded class of the parent, which is the type not portable to a SQL database. In this example, we need to define two data object classes, the State and the Address. The State is the enumeration type with total of 59 members representing the states used by United States Postal Service. Each Address class has an attribute member with this custom-defined State type as shown in Listing 1-6. Listing 1-6. An Address Class with an Attribute Member Using a Non-portable Custom-defined Type State public enum State { AL,AK,AS,AZ,AR,CA,CO,CT,DE,DC,FM,FL,GA,GU,HI, ID,IL,IN,IA,KS,KY,LA,ME,MH,MD,MA,MI,MN,MS,MO, MT,NE,NV,NH,NJ,NM,NY,NC,ND,MP,OH,OK,OR,PW,PA, PR,RI,SC,SD,TN,TX,UT,VT,VI,VA,WA,WV,WI,WY } public class Address : TableStorageEntity { ... public State State { get; set; } ... }
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