Using WHILE...BREAK or CONTINUE
The WHILE statement repeats a statement or block of statements as long as a specified condition remains true.
Two Transact-SQL statements are commonly used with WHILE: BREAK or CONTINUE. The BREAK statement exits the innermost WHILE loop and the CONTINUE statement restarts a WHILE loop. A program might execute a BREAK statement if, for example, there are no other rows to process. A CONTINUE statement could be executed if, for example, the execution of the code should continue.
|If a SELECT statement is used as the condition for the WHILE statement, the SELECT statement must be in parentheses.|
The following example uses a WHILE statement to control how many fetches are done:
USE AdventureWorks; GO DECLARE abc CURSOR FOR SELECT * FROM Purchasing.ShipMethod; OPEN abc; FETCH NEXT FROM abc WHILE (@@FETCH_STATUS = 0) FETCH NEXT FROM abc; CLOSE abc; DEALLOCATE abc; GO
Other valid WHILE condition tests could be the following:
WHILE (@ACounterVariable < 100)
WHILE EXISTS(SELECT LastName FROM Person.Contact WHERE FirstName = N'Anne')