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--SQL Server 2005 and earlier DECLARE @var INT
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SET @var = 1 SET @var = @var + 1 SELECT @var SET @var = @var * 2 SELECT @var SET @var = @var / 4 SELECT @var GO
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--SQL Server 2008 DECLARE @var INT
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Programming Microsoft SQL Server with T-SQL User-Defined Stored Procedures, Functions, Triggers, and Views
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SET @var = 1 SET @var += 1 SELECT @var SET @var *= 2 SELECT @var SET @var /= 4 SELECT @var GO
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Parameters
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Parameters are local variables that are used to pass values into a stored procedure when it is executed. During execution, any parameters are used just like variables and can be read and written. You declare a parameter as in this example:
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CREATE PROCEDURE <procedure name> @parm1 AS --Code block INT, @parm2 VARCHAR(20) = 'Default value'
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You can create two types of parameters: input and output. An output parameter is designated by using the keyword OUTPUT:
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CREATE PROCEDURE <procedure name> @parm1 @orderid AS --Code block INT OUTPUT INT, @parm2 VARCHAR(20) = 'Default value',
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Output parameters are used when you need to return a single value to an application. If you need to return an entire result set, you include a SELECT statement in the stored procedure that generates the results and returns the result set to the application as shown here:
CREATE PROCEDURE <procedure name> @parm1 AS --This will return the results of this query to an application SELECT SalesOrderID, CustomerID, OrderDate, SubTotal, TaxAmt, Freight, TotalDue FROM Sales.SalesOrderHeader INT, @parm2 VARCHAR(20) = 'Default value'
Control Flow Constructs
Stored procedures have several control flow constructs that can be used:
n n n n n n n
RETURN IF. . .ELSE BEGIN. . .END WHILE BREAK/CONTINUE WAITFOR GOTO
Lesson 1: Stored Procedures CHAPTER 5 149
A return code can be passed back to an application to indicate the execution status of the procedure. Return codes are not intended to send data but are used to report execution status. RETURN terminates the execution of the procedure and returns control back to the calling application. Any statements after the RETURN statement are not executed, as shown here:
CREATE PROCEDURE <procedure name> @parm1 AS --This will return the value 1 back to the caller of the stored procedure RETURN 1 INT, @parm2 VARCHAR(20) = 'Default value'
--Any code from this point on will not be executed
IF. . .ELSE provides the ability to conditionally execute code. The IF statement checks the condition supplied and executes the next statement when the condition evaluates to True. The optional ELSE statement allows you to execute code when the condition check evaluates to False. Here is an example:
DECLARE @var INT
SET @var = 1
IF @var = 1 PRINT 'This is the code executed when true.' ELSE PRINT 'This is the code executed when false.'
Regardless of the branch your code takes for an IF. . .ELSE, only the next statement is conditionally executed, as demonstrated in this example:
DECLARE @var INT
SET @var = 1
IF @var = 2 PRINT 'This is the code executed when true.' PRINT 'This will always execute.'
Because an IF statement conditionally executes only the next line of code, you have a problem when you want to execute an entire block of code conditionally. The BEGIN. . .END statement allows you to delimit code blocks that should execute as a unit, as shown here:
DECLARE @var INT
SET @var = 1
IF @var = 2 BEGIN PRINT 'This is the code executed when true.' PRINT 'This code is also executed only when the condition is true.' END
Programming Microsoft SQL Server with T-SQL User-Defined Stored Procedures, Functions, Triggers, and Views
WHILE is used to iteratively execute a block of code so long as a specified condition is true. Here is an example:
DECLARE @var1 @var2 INT, VARCHAR(30)
SET @var1 = 1
WHILE @var1 <= 10 BEGIN SET @var2 = 'Iteration #' + CAST(@var1 AS VARCHAR(2))
PRINT @var2
SET @var1 += 1 END
Best PraCtiCes
StateMent eXecUtiOn
One of the most common mistakes you can make when writing code blocks that use an IF or a WHILE is forgetting that SQL Server executes the next statement only conditionally. To avoid the most common coding mistakes, it is strongly recommended that you always use a BEGIN. . .END with an IF or WHILE, even when you are going to execute only a single line of code conditionally. Not only does it make the code more readable, but it also helps prevent bugs when your code is modified in the future.
BREAK is used in conjunction with a WHILE loop. If you need to terminate execution within a WHILE loop, you can use the BREAK statement to end the loop iteration. Once BREAK is executed, the next line of code following the WHILE loop is executed. CONTINUE is used within a WHILE loop to have the code continue to execute from the beginning of the loop.
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