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' Autogenerate INSERT, UPDATE, and DELETE commands ' based on exiting SELECT command. Dim da As SqlDataAdapter = New SqlDataAdapter("SELECT * FROM Inventory", cn) Dim invBuilder As SqlCommandBuilder = New SqlCommandBuilder(da) ' Fill data set. da.Fill(theCarsInventory, "Inventory") PrintDataSet(theCarsInventory) ' Delete row based on user input and update database. Try Console.Write("Row # to delete: ") Dim rowToDelete As Integer = Integer.Parse(Console.ReadLine()) theCarsInventory.Tables("Inventory").Rows(rowToDelete).Delete() da.Update(theCarsInventory, "Inventory") Catch e As Exception Console.WriteLine(e.Message) End Try ' Refill and reprint Inventory table. theCarsInventory = New DataSet() da.Fill(theCarsInventory, "Inventory") PrintDataSet(theCarsInventory) End Sub In the previous code, notice that you made no use of the command builder object (SqlCommandBuilder in this case) beyond passing in the data adapter object as a constructor parameter. As odd as this may seem, this is all you are required to do (at a minimum). Under the hood, this type will configure the data adapter with the remaining command objects. Now, while you may love the idea of getting something for nothing, do understand that command builders come with some critical restrictions. Specifically, a command builder is only able to autogenerate SQL commands for use by a data adapter if all of the following conditions are true: The Select command interacts with only a single table (e.g., no joins). The single table has been attributed with a primary key. The column(s) representing the primary key is accounted for in your SQL Select statement. If these restrictions are unacceptable, rest assured that much of the ADO.NET grunge code will be autogenerated by the Visual Studio 2005 Windows Forms and ASP.NET designer surfaces and integrated wizards. You ll see the Windows Forms ADO.NET wizards in action at the conclusion of this chapter (and their ASP.NET counterparts in Part 7).

Summary

Once you configure autobackup of the control file, RMAN can recover a database even if the current control file, the recovery catalog, and the server parameter file all turn out to be inaccessible The following are the steps RMAN takes in recovering the database: 1 RMAN will first restore the server parameter file from the location where the file was automatically backed up to by RMAN 2 RMAN will start the instance with the help of the server parameter file it restored in step 1 3 RMAN will restore the control file from the same autobackup 4 Once the control file is mounted, RMAN will connect to the target database in the nocatalog mode and use the RMAN repository available in the control file to restore the data files and then recover the database 5.

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Currently, all of this chapter s examples involved DataSets that contained a single DataTable object. However, the power of the disconnected layer really comes to light when a DataSet object contains numerous interrelated DataTables. In this case, you are able to insert any number of DataRelation objects into the DataSet s DataRelation collection to account for the interdependencies of the tables. Using these objects, the client tier is able to navigate between the table data without incurring network round-trips.

To illustrate the use of data relation objects, create a new Windows Forms project called MultitabledDataSet. The GUI is simple enough. In Figure 24-17 you can see three DataGridView widgets that hold the data retrieved from the Inventory, Orders, and Customers tables of the Cars database. In addition, the single Button pushes any and all changes back to the data store.

At this point, you may re-create a new recovery catalog and register your target databases in it 6 Finally, RMAN will copy all the RMAN repository records from the target database control files to the new recovery catalog This recovery sequence shows the importance of configuring the autobackup of the control file..

To keep things simple, the MainForm will make use of command builders to autogenerate the SQL commands for each of the three SqlDataAdapters (one for each table). Here is the initial update to the Form-derived type: Public Class MainForm ' Formwide DataSet. Private carsDS As DataSet = New DataSet("CarsDataSet") ' Make use of command builders to simplify data adapter configuration. Private sqlCBInventory As SqlCommandBuilder Private sqlCBCustomers As SqlCommandBuilder Private sqlCBOrders As SqlCommandBuilder ' Our data adapters (for each table). Private invTableAdapter As SqlDataAdapter Private custTableAdapter As SqlDataAdapter Private ordersTableAdapter As SqlDataAdapter ' Formwide connection object. Private cn As SqlConnection = _ New SqlConnection("server=(local);uid=sa;pwd=;database=Cars") ... End Class

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