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You can connect to an auxiliary instance either from the operating system command line or from the RMAN prompt. To connect to an auxiliary database instance from the operating system command line, simply replace the usual keyword target with the keyword auxiliary, as shown here: $ rman auxiliary sys/<sys_password>@aux You can also start the RMAN client first and then connect to the auxiliary instance from the RMAN prompt, as shown in this example: $ rman RMAN> connect auxiliary sys/<sys_password>@aux

The text data that we get our hands on is rarely in the format we need. As a contrived example, take the string in our test_numbers.txt file. How do we extract the numbers from a string that contains numbers separated by whitespace and other separators How do we locate the correct position in the string and extract the digit portion only The answer is regular expressions.

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Deleting an existing record is just as simple as inserting a new record. Simply build the SQL query and call ExecuteNonQuery(): Sub DeleteCar(ByVal cn As SqlConnection) ' Get ID of car to delete, then do so. Dim carToDelete As Integer = 0 Console.Write("Enter CarID of car to delete: ") Try carToDelete = Integer.Parse(Console.ReadLine()) Catch ex As FormatException Console.WriteLine(ex.Message) Return End Try Dim sql As String = _ String.Format("Delete from Inventory where CarID = '{0}'", carToDelete) Dim cmd As SqlCommand = New SqlCommand(sql, cn) Try cmd.ExecuteNonQuery() Catch Console.WriteLine("Sorry! That car is on order! Terminating request...") End Try End Sub

You mostly connect to an auxiliary database to perform a duplicate command or to perform a tablespace point-in-time recovery (TSPITR) operation. The syntax is the same as for connecting to a target database, except that you specify the keyword auxiliary rather than target. Note that you can t connect to the three types of databases auxiliary, target, and catalog database with one connection string once you re working from the RMAN command prompt, whereas you can connect to all three types from the operating system prompt. Once you re operating from an RMAN prompt, you have to connect using separate connect commands for each of the three databases, one after the other, as shown in the following examples: RMAN> connect target sys/<sys_password>@trgt RMAN> connect catalog rman/<rman_password>@catalog RMAN> connect auxiliary sys/<sys_password>@aux The following example shows how you can connect to all three types of database in one go from the operating system command line: % rman target sys/oracle@trgt catalog rman/cat@catalog auxiliary sys/aux@aux

If you followed the code behind DeleteCar() and InsertNewCar(), then UpdateCarPetName() is a no-brainer: Sub UpdateCarPetName(ByVal cn As SqlConnection) Dim carToUpdate As Integer = 0 Dim newPetName As String = "" Console.Write("Enter CarID of car to modify: ") Try carToUpdate = Integer.Parse(Console.ReadLine()) Catch ex As FormatException Console.WriteLine(ex.Message) Return End Try Console.Write("Enter new pet name: ") newPetName = Console.ReadLine() Dim sql As String = _ String.Format("Update Inventory Set PetName = '{0}' Where CarID = '{1}'", _ newPetName, carToUpdate) Dim cmd As SqlCommand = New SqlCommand(sql, cn) cmd.ExecuteNonQuery() End Sub With this, our application is feature complete! Figure 24-8 shows a test run (notice the deletion of the car with the ID of 99).

As you ll see in 15, when creating a duplicate database, you may not be able to connect to all three instances at once in this fashion, since the auxiliary database may not be open and hence may not permit the use of a connection string to connect to it.

The previous insert, update, and delete logic works as expected; however, note that each of your SQL queries is represented using hard-coded string literals. As you may know, a parameterized query can be used to treat SQL parameters as objects, rather than simple blobs of text. Typically, parameterized queries execute much faster than a literal SQL string, in that they are parsed exactly once (rather than each time the SQL string is assigned to the CommandText property). As well, parameterized queries also help protect against SQL injection attacks (a well-known data access security issue). ADO.NET command objects maintain a collection of discrete parameter types. By default this collection is empty, but you are free to insert any number of parameter objects that map to a placeholder parameter in the SQL query. When you wish to associate a parameter within a SQL query to a member in the command object s parameters collection, prefix the SQL text parameter with an at (@) symbol (at least when using Microsoft SQL Server; not all DBMSs support this notation so be sure to consult the documentation for your .NET data provider).

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