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Then the code creates a SqlCommand object and sets three important properties: Connection, CommandType, and CommandText. The Connection property specifies the SqlConnection instance that is to be used for firing queries. The CommandType property is an enumeration of type CommandType and indicates the type of command being executed. In our example, it is a plain SQL statement and hence set to CommandType.Text. The CommandText property specifies the SQL query or name of the stored procedure to be executed. In our example, the query is being supplied via the text box. While assigning the CommandText property, the FOR XML AUTO clause is appended to the original query. This clause indicates that the results are returned as a sequence of elements, where the element name is the same as the table name, attribute names are the same as column names, and attribute values are the same as column values. The connection is then established by using the Open() method of the SqlConnection class. The query is executed against the database by using the ExecuteXmlReader() method, which, as you saw, returns an instance of XmlReader that points to the result set. In our example, the code creates a physical disk file named temp.xml, iterates through the XmlReader by using its Read() method, and writes the XML data to the file. Notice the use of the ReadOuterXml() method to retrieve the XML data. Also, note that the XML data returned by ExecuteXmlReader() is in the form of elements and doesn t have a root node as such, so the code adds a <root> element to enclose all the returned data.

When done, click the Apply button, and the task will be scheduled to run at the specified times. In order for it to happen, it s not necessary that the Scheduled Tasks program to be open, because it is the cron daemon which handles the execution of the task itself, and it starts automatically with the system. But what happens if the PC is turned off when the task was meant to run Well, it s embarrassing to say, but what happens is that it just won t run. That s why you have another options to schedule a task, for example, anacron, which we talk about later in this chapter. Let s cover first the option to create a one-time task.

It would be highly unusual to miss setting the CommandText property. However, this is an expedient way to cause an ADO.NET exception. You specify the command is for a stored procedure call, but you don t specify the stored procedure to call: 'create command Dim cmd As SqlCommand = conn.CreateCommand 'Specify that a stored procedure is to be executed cmd.CommandType = CommandType.StoredProcedure So when you call the ExecuteReader method, you get an exception, as shown in Figure 16-2 earlier. Though it is an unhandled exception, it still gives you an accurate diagnostic: ExecuteReader: CommandText property has not been initialized. and it even gives you the option to continue or quit, but leaving this decision to users isn t a good idea. After seeing what happens without handling the exception, you place the call in a Try block: Try 'Open connection conn.Open() 'Create data reader Dim dr As SqlDataReader = cmd.ExecuteReader 'Close reader dr.Close() and to handle the exception yourself, you code two Catch clauses: Catch ex As System.Data.SqlClient.SqlException Dim str As String str = "Source: " + ex.Source.ToString str += ControlChars.NewLine + "Exception Message: " + ex.Message MessageBox.Show(str, "Database Exception") Catch ex As Exception Dim str As String str = "Source: " + ex.Source.ToString str += ControlChars.NewLine + "Exception Message: " + ex.Message MessageBox.Show(str, "non-Database Exception") In the first Catch clause, you specify a database exception type. The second Catch clause, which produces the message box in Figure 16-3, is a generic block that catches all types of

Because Ubuntu organizes all files and folders in a single hierarchy, it is often easy to forget that you might have more than one disk attached, and that they can be of different types. It is hard to tell the physical layout of your data just by using Nautilus. You might even forget you have available space in one of your disks that is just not partitioned, because unpartitioned space is just not shown in Nautilus. So when the time comes for doing some administration on your disks, you must use a different tool from Nautilus. Fortunately, and as you might already have guessed, Ubuntu includes such a tool: the Disk Utility, available at the System Administration menu. You can take a first look at it by examining Figure 10-10. Don t be scared!

After the writing of XML data is done, the StreamWriter, XmlReader, and SqlConnection are closed by using the Close() method of the respective classes. The Process class (residing in the System.Diagnostics namespace) opens the temp.xml file in a new browser window. If you run the application and supply a SELECT query, you should see the output shown in Figure 7-2.