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CHAPTER 14 BUILDING SMART WEB APPLICATIONS
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Understanding the Provider Model
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ASP.NET comes with a number of built-in application services that you can use and customize as you build your web applications. These encapsulate much of the core functionality common to most web sites, such as membership and role management, profiles and personalization, and site navigation, and you can easily plug them into your web-site logic out of the box. These services interact with service-specific data (the users registered, the different user roles your site is programmed for, various data associated with the authenticated users, and so on) via providers, which are classes that implement the appropriate interfaces to fulfill contracts for various services. ASP.NET comes with a number of built-in providers; for instance, it has a SQL and an Active Directory membership provider. The provider model allows you to plug in your own providers (by specifying them in the appropriate section of your web.config), so you may write an Oracle or a custom membership provider to your existing user/membership database or a role service provider based on simple XML files. Table 14-9 shows some common provider-based services in ASP.NET. Table 14-9. ASP.NET Provider-Based Services
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Encryption Membership Profile Role Management Session Management Site Map Web Events Web Parts
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Handles the encryption and decryption of ASP.NET configuration files and sections within Manages users and their accounts Adds user information (for instance, user preferences) that is to be collected and stored for each user Manages roles and their associated access rights Manages session state for a user visit Stores information about each page and its place in the site s structure Allows the monitoring of an application for control purposes Manages a set of controls and their content and appearance that make up a portal
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Configuring the Provider Database
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By default (as guided by the server s machine.config file), the data-aware services use SQL providers that work against a SQL Express database (by default, aspnetdb.mdf in the App_Data folder). The relevant part of the machine.config containing the default connection strings is as follows: <connectionStrings> <clear /> <add name="LocalSqlServer" connectionString="data source=.\SQLEXPRESS;Integrated Security=SSPI; AttachDBFilename=|DataDirectory|aspnetdb.mdf;User Instance=true" providerName="System.Data.SqlClient" /> </connectionStrings>
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CHAPTER 14 BUILDING SMART WEB APPLICATIONS
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This defines a LocalSqlServer connection string that all data-centric providers use by default, which points to the aspnetdb.mdf SQL Express database in the web data directory. (Note how the database server is set to be running as a SQL Express named instance.) This database file is automatically created on first use or by triggering the web-site administration console. It s important to remember that these default settings work only with SQL Express; but on a typical development machine with a standard SQL Express installation, everything works like a charm out of the box. Even if you re using SQL Express and all the default providers, you should (re)define the connection string settings in your site web.config file, mostly because it s more portable that way and because this becomes necessary if you use a different database server, say SQL Server. At the time of writing, SQL Server doesn t let you attach database files to the server using the AttachDBFilename property, so you need to use a regular database and refer to it using the Initial Catalog or Database keyword in your connection string. If for some reason you can t automatically generate the default database when using SQL Server, you can build it by hand by first creating an empty database (for instance, by right-clicking Server Explorer/Data Connections and selecting Create New SQL Server Database) and running aspnet_regsql.exe (found in your .NET installation folder) in wizard mode with the information about your newly created database. This tool generates all the data tables and stored procedures needed by the default providers. You can then change your web.config file to include a reference to this new database: <connectionStrings> <remove name="LocalSqlServer" /> <add name="LocalSqlServer" connectionString="Data Source=localhost;Integrated Security=SSPI; Initial Catalog=YourDatabase" providerName="System.Data.SqlClient" /> </connectionStrings> Here you use localhost for SQL Server and the YourDatabase database. You may need to change the host when you deploy your application to point to the right database server. Furthermore, be aware that SQL Server doesn t support detached databases (.mdf files); if you re migrating from a SQL Express instance (for example, when your hosting provider supports only SQL Server), you need to manually import the contents of the detached database file into a SQL Server database (either by attaching it from the hosting provider s administrative console or creating a backup from the Express database and importing it). In other words, there is no way to use the .mdf database with SQL Server directly.
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