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Figure 16-5. Handling a specific ADO.NET exception 4. For a quick comparison, you ll now generate a SQL Server exception, an error that occurs within the database. Alter the name of the stored procedure in the code to a name that doesn t exist at all within the Northwind database. For example: cmd.CommandText = "sp_Select_No_Employees"; 5. Run the program by pressing Ctrl+F5. Click the ADO.NET Exception-2 button, and you ll see the message box in Figure 16-6. Click OK. When the Finally block message appears, click OK, and then close the window.

At first glance, it seems easy to manage permissions in a Linux environment: instead of the many permissions some other operating systems work with, Linux has just three. However, upon closer examination, you ll see that the system that was invented somewhere in the 1970s is only the foundation for a system that can be pretty complex. The following subsections are overviews of all subjects relevant to permission management.

If you try to delete one of the three other shippers, you ll get a database error. A foreign-key relationship exists from Orders to Shippers, and SSE enforces it, preventing deletion of Shippers rows that are referred to by Orders rows. We ll examine this in detail in 10.

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The three elementary permissions read (r), write (w), and execute (x) are the foundation to working with permissions in a Linux system. The use of these permissions is not hard to understand: read allows a user to read the file or the contents of the directory the permission is applied to; write allows the user to change an existing file if applied to a file and to create or remove files in a directory it is applied to; and execute is used to allow a file to execute executable code. If applied to a directory, it allows a user to activate that directory with a command like cd. Therefore, the execute permission is applied as a default permission to all directories on a Linux system. Table 5-1 summarizes the workings of these three basic permissions. Table 5-1. Overview of Linux Basic Permissions

First you create the data reader and try to access an invalid column: 'Create data reader Dim dr As SqlDataReader = cmd.ExecuteReader 'Access nonexistent column Dim str As String = dr.GetValue(20).ToString so an exception is thrown because column 20, the value of which you try to get, doesn t exist. You add a new Catch clause to handle this kind of ADO.NET error: Catch ex As System.InvalidOperationException Dim str As String str = "Source: " + ex.Source.ToString str += ControlChars.NewLine + "Exception Message: " + ex.Message str += ControlChars.NewLine + ControlChars.NewLine str += "Stack Trace: " + ex.StackTrace MessageBox.Show(str, "Specific Exception")

statement might be preferable to the DELETE statement, because it performs better. The TRUNCATE TABLE statement is faster because it doesn t do any logging (saving each row in a log file before deleting it) to support recovery, while DELETE logs every row removed. See BOL for descriptions of both TRUNCATE TABLE and logging.

This concludes our introduction to basic SQL for retrieving, adding, changing, and removing data. Next we ll look at T-SQL data types.

Read contents of a file Modify existing files and their properties Execute files that contain executable code

When an exception of type System.InvalidOperationException is thrown, this Catch clause executes, displaying the source, message, and stack trace for the exception. Without this specific Catch clause, the generic Catch clause will handle the exception. (Try commenting out this Catch clause and reexecuting the code to see which Catch clause handles the exception.) Next, you run the program for a nonexistent stored procedure: 'Specify that a stored procedure is to be executed cmd.CommandType = CommandType.StoredProcedure cmd.CommandText = "sp_Select_No_Employees" You catch your (first) database exception with Catch ex As System.Data.SqlClient.SqlException leading into the next topic: handling exceptions thrown by the database manager.

T-SQL provides a variety of base data types 27 of them. All stored SQL Server data must be compatible with one of them. Let s briefly survey them.

See files existing in a directory by using the ls command Create or delete files from a directory Activate a subdirectory with the cd command

s Note User-defined data types (UDTs), either aliases created from base data types or CLR UDTs based on

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