MySQL : transaction within a stored procedure

Question

The basic structure of my stored procedure is,

BEGIN

    .. Declare statements ..

    START TRANSACTION;

        .. Query 1 ..
        .. Query 2 ..
              


        

Answer 1

Just an alternative to the code by rkosegi,

BEGIN

    .. Declare statements ..

    DECLARE EXIT HANDLER FOR SQLEXCEPTION 
    BEGIN
          .. set any flags etc  eg. SET @flag = 0; ..
          ROLLBACK;
    END;

    START TRANSACTION;

        .. Query 1 ..
        .. Query 2 ..
        .. Query 3 ..

    COMMIT;
    .. eg. SET @flag = 1; ..

END