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A cursor can be opened locally (the default) or globally. Once opened, you can begin using the FETCH command to navigate through rows in the cursor. The syntax for FETCH NEXT is as follows: FETCH [ [ NEXT | PRIOR | FIRST | LAST | ABSOLUTE { n | @nvar } | RELATIVE { n | @nvar } ] FROM ] { { [ GLOBAL ] cursor_name } [ INTO @variable_name [ ,...n ] ] FETCH provides several options for navigating through rows in the cursor, by populating the results into local variables for each column in the cursor definition (this is demonstrated in the next recipe). The @@FETCH_STATUS function is used after a FETCH operation to determine the FETCH status, returning 0 if successful, -1 for unsuccessful, or -2 for missing. Once you are finished with the opened cursor, execute the CLOSE command to release the result set from memory. The syntax is as follows: CLOSE { [ GLOBAL ] cursor_name } At this point you can still reopen the cursor if you want to. If you are finished however, you should remove internal system references to the cursor by using the DEALLOCATE command. This frees up any resources used by the cursor. For example if scroll locks are held on the cursor referenced in the table, these locks are then released after a DEALLOCATE. The syntax is as follows: DEALLOCATE { [ GLOBAL ] cursor_name } This next recipe will demonstrate each of these commands in action.

In order to pass other options on to these processes the -W<letter> options must be used..

Although this book recommends the minimal use of cursors, using cursors for ad hoc, periodic database administration information-gathering, as I demonstrate in this next example, is usually perfectly justified. This recipe demonstrates a cursor that loops through each session ID ( SPID, formerly called server process ID ) currently active on the SQL Server instance, and executes DBCC INPUTBUFFER to see the SQL statements each connection is currently executing (if it is executing anything at that moment): -- Don't show rowcounts in the results SET NOCOUNT ON DECLARE @spID smallint -- Declare the cursor DECLARE spID_cursor CURSOR FORWARD_ONLY READ_ONLY FOR SELECT spID FROM sys.sysprocesses WHERE status IN ('runnable', 'sleeping') -- Open the cursor OPEN spID_cursor -- Retrieve one row at a time from the cursor FETCH NEXT FROM spID_cursor

Listing 3-2 uses a Fortran program for displaying numbers in the Fibonacci sequence. This program prints the first eight values in the Fibonacci sequence. I didn t write this code, but it serves as a useful starting point for the discussion of compiling Fortran code in the next section. Listing 3-2. Sample Fortran Code fib.f90 ! ! Hacked Fibonacci program from the web: ! http://cubbi.org/serious/fibonacci/fortran.html ! PROGRAM MAIN DO 200, K=0,7 I=K J=K+1 CALL F(I) PRINT *,J,'th Fibonacci number is',I 200 CONTINUE END PROGRAM ! ! Subroutine F(I) calculates the I'th Fibonacci number ! It uses ALGORITHM 2A-3: DATA STRUCTURE - SIMPLE LIST ! ! Modified to begin with 0 - wvh ! SUBROUTINE F(I) DIMENSION A(I+1) A(1)=0; A(2)=1 DO 1, J=3,I+1 A(J)=A(J-1)+A(J-2) 1 CONTINUE I=A(I+1) RETURN END SUBROUTINE The code shown in Listing 3-2 is vanilla Fortran code that compiles successfully using most Fortran 90 and Fortran 95 compilers. The name of the file containing this code is fib.f90. I ve used Fortran 90 compliant syntax in Listing 3-2 in order to highlight some of the features of gfortran, as explained in the next section.

ImageMagick can also apply histogram equalization to an image. For this example, I ll show how to equalize the image shown in Figure 6-13.

-- Keep retrieving rows while the cursor has them WHILE @@FETCH_STATUS = 0 BEGIN -- See what each spID is doing PRINT 'SpID #: ' + STR(@spID) EXEC ('DBCC INPUTBUFFER (' + @spID + ')') -- Grab the next row FETCH NEXT FROM spID_cursor INTO @spID END -- Close the cursor CLOSE spID_cursor -- Deallocate the cursor DEALLOCATE spID_cursor This returns the current Transact-SQL activity for each process on the SQL Server instance.

-fno-asm -fno-builtin -fno-signed-bitfields -fno-signed-char -fno-unsigned-bitfields -fno-unsigned-char -fshort-wchar -fsigned-bitfields -fsigned-char -funsigned-bitfields -funsigned-char -fwritable-strings -no-integrated-cpp -std=value

The recipe started off by setting SET NOCOUNT ON, which suppresses the SQL Server row count messages in order to provide cleaner output: -- Don't show rowcounts in the results SET NOCOUNT ON Next, a local variable was defined to hold the individual value of the server process ID to be fetched from the cursor: DECLARE @spID smallint The cursor was then defined using DECLARE CURSOR. The cursor contained the SPID column from the sys.sysprocesses system view: -- Declare the cursor DECLARE spID_cursor CURSOR FORWARD_ONLY READ_ONLY FOR SELECT spID FROM sys.sysprocesses WHERE status IN ('runnable', 'sleeping') After the cursor was defined, it was then opened (populated): OPEN spID_cursor Once opened, the first row value was retrieved into the @SPID local variable using FETCH NEXT: FETCH NEXT FROM spID_cursor INTO @spID FETCH NEXT was used to retrieve the first row. After the first fetch, a WHILE condition was defined that told SQL Server to continue the loop of statements until the cursor s fetch status was no longer successful (meaning no more rows could be retrieved). WHILE @@FETCH_STATUS = 0

Next, an INSERT..SELECT is performed: INSERT Shift_Archive (ShiftID, Name, StartTime, EndTime, ModifiedDate) SELECT ShiftID, Name, StartTime, EndTime, ModifiedDate FROM HumanResources.Shift ORDER BY ShiftID The results show that three rows were inserted: (3 row(s) affected)

Table 1-1. C Dialect Command-Line Options (Continued)

Next, a query is executed to confirm the inserted rows in the Shift_Archive table: SELECT ShiftID, Name FROM Shift_Archive This returns: ShiftID ------1 2 3 Name -------------------------------------------------Day Evening Night