How Can I Call Stored Procedures for Each Table Row Without Using Cursors?

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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