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Building the Project
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Now that you ve added the ability to deploy the database file to the target computer, you can rebuild your deployment project to make sure everything works as intended. To do this, rightclick the deployment project and select the Build option. If you do that right now, you will probably receive an error message similar to the following: FriendsReunion Deployment.vdproj Unable to find source file '...\Friends_Data.MDF' for file 'Friends_Data.MDF', located in '[DBPATH]', the file * If you get this error, it s because the database server keeps the file opened and locked whenever it s running. To remove this error, you ll need to stop the SQL Server Engine for a few seconds while you perform the build. Try It Out: Manage the MSDE Service The SQL Server Engine doesn t run as an application, so to speak, which means that you cannot simply close it down. Instead, it runs as a service, or task, in the background. You need to stop this service in order to perform the build. 1. To view all of the services running on your machine, select Start Settings Control Panel Administrative Tools Services. You ll see the Services window, which should look similar to Figure 13-13.
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Figure 13-13. The Services window lists all services installed on your machine.
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CHAPTER 13 PUBLISHING WEB APPLICATIONS IN .NET
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2. The entry you want begins with MSSQL, and is probably named MSSQL$NetSDK or MSSQLSERVER. Locate this item, right-click it to bring up the context menu, and then select the Stop option. This stops the database server engine. 3. With the SQL Server Engine service temporarily disabled, switch back to VS .NET, right-click the deployment project, and select Build. It should complete successfully. 4. Once the build has finished, the SQL Server Engine can be restarted. To do this, rightclick it in the Services window and select the Start option that should now be enabled. 5. Now run your installation package to install the application. You ll find that it includes an extra screen, which prompts you for the desired database location, as shown in Figure 13-14.
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Figure 13-14. The new Database Location dialog box added to the installation
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How It Works While SQL Server is running, it maintains connections with all of the files it uses for storing database information, allowing it to have fast access and greater control over them. The cost of this is that it stops such files from being manipulated in the ways necessary to create installation packages. By stopping the SQL Server Engine service, you force SQL Server to shut down, releasing all of its locks on these files in the process. With this done, any operations that need to be performed on these files, such as copying, can be carried out. Once the build has been completed, SQL Server can be restarted, at which point it will reestablish its locks on the files.
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CHAPTER 13 PUBLISHING WEB APPLICATIONS IN .NET
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Try It Out: Restrict Access to Database Files As a security precaution, you will forbid access from clients to the database files, just in case the user installs them in the same folder as the web application. Add the following code to the Web.config file: <configuration> <system.web> <httpHandlers> <add verb="*" path="*.mdf" type="System.Web.HttpForbiddenHandler" /> <add verb="*" path="*.ldf" type="System.Web.HttpForbiddenHandler" /> </httpHandlers> This configuration tells the ASP .NET engine that all files with extensions .mdf and .ldf cannot be downloaded by a client.
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Adding Custom Actions
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Custom actions, as their name suggests, allow you to add custom operations to installers. With custom actions, you can implement features unique to each project that are not supported by the out-of-the-box installer. These actions can be in the form of an executable (.exe file), a .dll, or a script that can be attached to setup projects to perform their specific tasks. Since the installation of a database is fairly common, it makes a great example of using custom actions. Try It Out: Register the Database with a Custom Action In this example, you ll create an executable program that can attach a backup of the SQL database file to your deployment server. You ll automate the steps that you performed manually to set up the database (as explained in the Setup.txt file in the Db folder of the code download for this book and discussed in Appendixes A and B). 1. Add a new VB Console Application project to the solution, giving it the name FriendsReunionInstaller. 2. Open the Module1.vb file that appears in the Solution Explorer. Import the following namespaces at the top of the file: Imports System.Diagnostics Imports System.IO 3. Add the following code to the Main method: Sub Main(ByVal args As String()) Dim patharg As String = args(0) Dim cmd As String = String.Format( _ "-S (local) -E -Q ""sp_attach_db N'FriendsData', N'{0}', N'{1}'", _ Path.Combine(patharg, "Friends_Data.mdf"), _ Path.Combine(patharg, "Friends_Log.ldf")) ' Execute the attach DB command Dim p As Process = Process.Start("osql", cmd) p.WaitForExit()
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