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-- Get first row from inserted FETCH NEXT FROM CInserted INTO @key, @in_arg1, @in_arg2, @in_arg3, @comp ; WHILE @@fetch_status = 0 BEGIN -- Generate a string with the in/out parameters SET @params = N'@result INT output, @arg1 INT, @arg2 INT, @arg3 INT'; -- Calculate computation and store the result in @out_result EXEC sp_executesql @comp, @params, @result = @out_result OUTPUT, @arg1 = @in_arg1, @arg2 = @in_arg2, @arg3 = @in_arg3; -- Update the result column in the row with the current key UPDATE dbo.Computations SET result = @out_result WHERE keycol = @key; -- Get next row from inserted FETCH NEXT FROM CInserted INTO @key, @in_arg1, @in_arg2, @in_arg3, @comp; END CLOSE CInserted; DEALLOCATE CInserted; END GO

An image generator object can receive input in two ways through the URL query string and using the DynamicImage s Parameters collection. In the former case, the browser ends up referencing the image as follows:

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The trigger first evaluates the number of rows that were affected by the firing statement (INSERT, UPDATE, or MERGE) . If zero rows were modified, the trigger simply terminates . It has nothing to do in such a case . The trigger then checks whether one of the four relevant columns (arg1, arg2, arg3, computation) was modified, using the COLUMNS_UPDATED() function . I described this function in more detail in 4, Triggers . This function returns a bitmap with a representative bit for each column . For an UPDATE statement, the bit is turned on if the corresponding column was specified in the SET clause, and it s turned off if the corresponding column wasn t specified in the SET clause . For an INSERT statement, all column bits are turned on . If none of the relevant columns were modified, the trigger simply terminates . It has no reason to reevaluate the computation if neither the inputs nor the computation changed . If the statement that fired the trigger was an UPDATE statement (or a MERGE statement containing an UPDATE action), and the column result was modified, the trigger generates an error message and rolls back the update . The trigger defines local variables to host the input arguments, the computation, and the result value . Each row must be handled separately, so a cursor is needed if there is more than one row .

txt) as an argument in the File Name edit control, the system displays an error message indicating the file already exists and asking, "Do you want to replace it " Of course, you cannot save a file name that is a reserved device name in the Windows operating system, so when I was testing this condition, I clicked Yes in that dialog box The document window title actually changed to display LPT1 Notepad; however, the file was not saved, and after I closed the file the contents of the file were lost An update to Windows XP attempted to correct this defect;.

For each modified row, the trigger reads the inputs and the computation into its local variables . Notice that the trigger adds a prefix to the computation: N SET @result = + computation . This is a very important trick that allows you to return the result of the computation back to the trigger s local variable (@out_result) through an output parameter (@result) . After reading the inputs and the computation from the current row into the trigger s local variables, the code invokes sp_executesql to evaluate the expression and store it in @out_result through the output parameter @result:

The image generator retrieves query string parameters using the Request object and the QueryString collection. This approach is viable when you programmatically bind to the image generator, but it doesn t lend itself well to declarative binding. In this case, the Parameters collection is more helpful:

EXEC sp_executesql @comp, @params, @result = @out_result OUTPUT, @arg1 = @in_arg1, @arg2 = @in_arg2, @arg3 = @in_arg3;

Now that the result is stored in the @result variable, the trigger updates the corresponding row in the Computations table with the result value . To test the trigger, issue the following INSERT statements and query the Computations table:

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