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4. In order to pass arguments to the installer classes, instead of using the Arguments property you used for the console application, you must use the CustomActionData property. Switch to the Custom Actions Editor for the setup project, select the FriendsReunionInstaller item inside the Install folder, and set the following properties on it: (Name): FriendsReunionInstaller Arguments: Leave blank Condition: Leave blank CustomActionData: /db=[DBPATH] InstallerClass: True 5. Now you need to add the code for the installation procedure. For that purpose, you will simply copy and paste the code you had in the previous Main method into a new one in this class, with some minor changes: Public Overrides Sub Install(ByVal stateSaver As IDictionary) MyBase.Install(stateSaver) ' Warn the user that we need the service to be running MessageBox.Show( _ "Ensure the SQL Server / MSDE service is running " + _ "for a proper installation.", _ "Database Service", MessageBoxButtons.OK, _ MessageBoxIcon.Warning) Dim patharg As String = MyBase.Context.Parameters("db") 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() ' Create the apress user p = Process.Start("osql", _ "-S (local) -E -Q ""sp_addlogin @loginame='apress', " + _ "@passwd='apress', @defdb='FriendsData'""") p.WaitForExit() ' Set the apress user as owner of the database p = Process.Start("osql", _ "-S (local) -E -d ""FriendsData"" -Q ""sp_adduser 'apress', " + _ "null, 'db_owner'""") p.WaitForExit() End Sub

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One oddity with bind variables and ranges: you might expect character_col like :bind to be treated the same way as a between clause, after all, colX like 'A%' looks as if it should be treated like colX >= 'A' and colX < 'B' which it nearly is. In fact (see script like_test.sql in the online code suite), when the optimizer sees this comparison with a bind variable, it uses the same 5% selectivity as it does for an unbounded range with the usual caveat about the effects of bind variable peeking.

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6. You can now delete the Module1.vb file, since you are not using it anymore. 7. Now add the Uninstall method: Public Overrides Sub Uninstall(ByVal savedState As IDictionary) ' Warn the user that we need the service to be running MessageBox.Show( _ "Ensure the SQL Server / MSDE service is running " + _ "for a proper uninstallation.", _ "Database Service", MessageBoxButtons.OK, _ MessageBoxIcon.Warning) Process.Start("osql", _ "-S (local) -E -Q ""sp_detach_db N'FriendsData'""") MyBase.Uninstall(savedState) End Sub Here, you are simply calling another command that detaches a database from the server. 8. In order to make the procedure bullet-proof, you ll also implement the Rollback() method: Public Overrides Sub Rollback(ByVal savedState As IDictionary) MyBase.Uninstall(savedState) End Sub 9. Installer classes need to be deployed to the target machine in order to be executed. Therefore, you must set the FriendsReunionInstall project output Exclude property to False. Do this by selecting the project output item in the setup project, opening the Properties browser for it, and changing the Exclude property setting. 10. Now you must add the project output to the Rollback and Uninstall nodes in the Custom Action Editor. Right-click the Rollback node and select Add Custom Action. In the editor, select the Database folder in the Look in drop-down list and select the Primary output from FriendsReunionInstaller (Active) item. Rename the custom action to FriendsReunionInstaller. 11. Repeat step 10 for the Uninstall node. 12. Compile the setup project and install it.

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The predicates that use literal values need a little more explanation. The informal, and approximate, version of the optimizer s algorithm reads as follows: Selectivity = required range divided by total available range By looking at (user_tab_col_statistics.high_value user_tab_col_statistics.low_value), we can calculate that the total range in our example is 11. And as soon as you see the number 11, you know that something is going to go wrong with our test case. We know that the test case is about 12 discrete measurements, but the optimizer uses arithmetic that treats the data as if it were continuously variable values with a total range of 11. Anything that the optimizer does with small numbers of distinct values is going to have a critical error built in. (It s a bit like the problem that young children have with fence posts and fence panels why are there 11 posts, but 10 panels Putting it the grown-up way how come there are 11 integers between 30 and 40 when 40 30 = 10 ) But how should we apply the algorithm in each of the slightly different cases

This additional text chunk can prove very useful when implementing a custom data source, for example. You could store in it a key, or whatever information you might need in order to retrieve the field s value from the custom data source at runtime. By using the optional <fieldDesciption> element instead of the field name, you can easily overcome restrictions of field-naming conventions when retrieving the field values from the data source. <field name="PersonName" class="java.lang.String" isForPrompting="true"> <fieldDesciption>PERSON NAME</fieldDesciption> </field> The field description is less important than in previous versions of the library because now even the field s name accepts dots, spaces, and other special characters.

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