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@@NESTLEVEL returns the current nesting level for the stored procedure context. A stored procedure nesting level indicates how many times a stored procedure has called another stored procedure. SQL Server 2005 allows stored procedures to make up to a maximum of 32 nested (incomplete) calls. This recipe demonstrates how to capture the current nesting level for the stored procedure context (see 10): -- First procedure CREATE PROCEDURE usp_QuickAndDirty AS SELECT @@NESTLEVEL GO -- Second procedure CREATE PROCEDURE usp_Call_QuickAndDirty AS SELECT @@NESTLEVEL EXEC usp_QuickAndDirty GO After creating the two stored procedures, @@NESTLEVEL function is used prior to calling the usp_Call_QuickAndDirty stored procedure: -- Returns 0 nest level SELECT @@NESTLEVEL -- Returns 1 and 2 nest level EXEC usp_Call_QuickAndDirty This returns three result sets: 0

Some of the more significant incompatibilities between GNU C (the default standard used by gcc) and K&R (non-ISO) versions of C are the following: The gcc compiler normally makes string constants read-only If several identical string constants are used at various points in an application, gcc only stores one copy of the string One consequence of this is that, by default, you cannot call the mktemp() function with an argument that is a string constant, because mktemp() always modifies the string that its argument points to Another consequence is that functions such as fscanf(), scanf(), and sscanf() cannot be used with string constants as their format strings, because these functions also attempt to write to the format string The best solution to these situations is to change the program to use arrays of character variables that are then initialized from string constants.

In this recipe, I created two stored procedures. The first stored procedure, in this case usp_QuickAndDirty, executed @@NESTLEVEL. The second stored procedure also called @@NESTLEVEL, and then executed the first stored procedure. Before calling the procedure, @@NESTLEVEL returned 0. At each executionnesting, the value of @@NESTLEVEL is incremented.

@@SERVERNAME displays the local server name and @@VERSION returns the SQL Server instance version, date, and processor information. This example returns the current SQL Server instance s name and version information: SELECT @@SERVERNAME ServerName, @@VERSION VersionInformation

To be kind, gcc provides the -fwritable-strings option, which causes gcc to handle string constants in the traditional, writable fashion This option is automatically activated if you supply the -traditional option To gcc, the value -2147483648 is positive because 2147483648 cannot fit in an int data type This value is therefore stored in an unsigned long int, as per the ISO C rules The gcc compiler does not substitute macro arguments when they appear inside of string constants For example, the following macro in gcc: #define foo(a) "a" will produce the actual string "a" regardless of the value of a Using the -traditional option causes gcc to do macro argument substitution in the traditional (old-fashioned) non-ISO way When you use the setjmp() and longjmp() functions, the only automatic variables guaranteed to remain valid are those declared as volatile This is a consequence of automatic register allocation.

In this recipe, I demonstrated returning the current SQL Server instance name and version information. Like the system configuration functions before it, no parameters were required.

If you use the -W option with the -O option, gcc will display a warning when it thinks you may be depending on nonvolatile data in conjunction with the use of these functions Specifying gcc s -traditional option causes gcc to put variables on the stack in functions that call setjmp(), rather than in registers This results in the behavior found in traditional C compilers..

Returning the Current Connection s Session ID (SPID)