Rolls back a transaction.

Syntax

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ROLLBACK [WORK]

Usage

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Use this statement to roll back an active transaction. The WORK keyword is optional. See the Transactions topic for more information on rolling back transactions.

Examples

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-- This procedure uses an IF statement
-- to conditionally test if the State column
-- is equal to 'FL', and if so, to change it
-- to 'NY'

-- The whole update process is wrapped inside
-- of a transaction start..commit/rollback block

CREATE PROCEDURE UpdateState()
BEGIN
   DECLARE CustCursor CURSOR WITH RETURN FOR Stmt;
   DECLARE State CHAR(2) DEFAULT '';

   PREPARE Stmt FROM 'SELECT * FROM Customer';

   OPEN CustCursor;

   START TRANSACTION ON TABLES 'Customer';
   BEGIN

      FETCH FIRST FROM CustCursor ('State') INTO State;

      WHILE NOT EOF(CustCursor) DO
         IF (State='FL') THEN
            UPDATE CustCursor SET 'State'='NY';
         END IF;
         FETCH NEXT FROM CustCursor ('State') INTO State;
      END WHILE;

      COMMIT;

   EXCEPTION
      ROLLBACK;
   END;
END

SQL 2003 Standard Deviations

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This statement deviates from the SQL 2003 standard in the following ways: