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because you can t cast a String to an Integer. Another problem may occur if a query actually returns multiple rows where you thought it would return only one; for example, what if there were multiple employees with the last name Davolio In this case, ExecuteScalar() just returns the first row of the result and ignores the rest. If you use ExecuteScalar(), make sure you not only expect but actually get a single value returned.

Try 'Open connection conn.Open() 'Execute stored procedure cmd.ExecuteNonQuery() Catch ex As System.Data.SqlClient.SqlException Dim str As String str = "Source: " + ex.Source.ToString str += ControlChars.NewLine + "Number: " + ex.Number.ToString str += ControlChars.NewLine + "Message: " + ex.Message str += ControlChars.NewLine + "Class: " + ex.Class.ToString str += ControlChars.NewLine + "Procedure: " + ex.Procedure str += ControlChars.NewLine + "Line Number: " + ex.LineNumber.ToString str += ControlChars.NewLine + "Server: " + ex.Server MessageBox.Show(str, "Database Exception") Catch ex As System.Exception Dim str As String str = "Source: " + ex.Source.ToString str += ControlChars.NewLine + "Exception Message: " + ex.Message MessageBox.Show(str, "General Exception") Finally If conn.State = ConnectionState.Open Then MessageBox.Show("Finally block Closing the connection", "Finally") conn.Close() End If End Try 3. Run the program by pressing Ctrl+F5, and then click the Database Exception-2 button. You ll see the message box in Figure 16-9. Click OK to close the message box, click OK to close the next one, and then close the window.

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stop on runlevel 0 stop on runlevel 1 stop on runlevel 6 respawn exec /sbin/getty 38400 tty1 As you have seen, the Upstart service activates services as specified in the different files in /etc/event.d. This is pretty much the same as what happened on older versions of Ubuntu Server that still used the init process. One of the most important tasks of Upstart is that it s also responsible for starting all the services that are needed on your server. To do this, it uses the concept of runlevels.

For queries where you re expecting multiple rows and columns to be returned, use the command s ExecuteReader method. ExecuteReader() returns a data reader, an instance of the SqlDataReader class that you ll study in the next chapter. Data readers have methods that allow you to read successive rows in result sets and retrieve individual column values. We ll leave the details of data readers for the next chapter, but for comparison s sake, we ll give a brief example here of using the ExecuteReader method to create a SqlDataReader from a command to display query results.

To use the ExecuteReader method, follow these steps: 1. Add a Visual Basic Console Application project named CommandReader to the 06 solution. 2. Replace the code in Module1.vb with the code in Listing 6-3.

The default runlevel on Ubuntu Server is runlevel 2, in which all the services that have to be started are referred to Before entering runlevel 2, Ubuntu Server passes through runlevel S In this runlevel, all the essential services that are always required on your server are started The configuration of both works in more or less the same way To understand the working of a runlevel, you need to understand two components: the service scripts and the scripts that execute these service scripts All of the service scripts are found in the /etc/initd directory, and they are used to start fundamental services such as the mounting of file systems as well as network services like your Apache server To specify which of these scripts have to be executed when starting your server, two runlevel-related directories are used The first of these directories is /etc/rcS.

The stored procedure tries to insert a new employee into the Employees table: insert into employees ( employeeid, firstname ) values (50, 'Cinderella') However, since the EmployeeID column in the Employees table is an IDENTITY column, you can t explicitly assign a value to it.

Imports System Imports System.Data Imports System.Data.SqlClient Module Module1 Sub Main() ' Set up connection string

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