


Calling Stored Procedures for Table Rows Without Cursors
Using cursors to call stored procedures for each row in a table is a common approach. However, there are alternative methods that can offer performance benefits and code clarity.
One such method involves a set-based approach, which avoids the need for cursors entirely. This approach is suitable for scenarios where the columns of a row can be directly supplied as input parameters to the stored procedure.
The following code snippet demonstrates how to achieve this:
SQL
-- Declare & init (2008 syntax) DECLARE @CustomerID INT = 0 -- Iterate over all customers WHILE (1 = 1) BEGIN -- Get next customerId SELECT TOP 1 @CustomerID = CustomerID FROM Sales.Customer WHERE CustomerID > @CustomerId ORDER BY CustomerID -- Exit loop if no more customers IF @@ROWCOUNT = 0 BREAK; -- call your sproc EXEC dbo.YOURSPROC @CustomerId END
This snippet starts by initializing a variable @CustomerID to 0. It then enters a WHILE loop that iterates over customer rows in ascending order of CustomerID, retrieving the next customer's ID into @CustomerID in each iteration.
Once a customer's ID is obtained, the stored procedure YOURSPROC is invoked using that ID as a parameter. The loop continues until no more customers are found in the table.
Using this approach can offer improved performance over cursors in certain scenarios, and it also provides a more concise and readable code structure.
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