mysql-create-cursor-example-template into cursor

delimiter $$
drop trigger if exists `updateTaxDocAfterEmployeeUpdate`;
CREATE TRIGGER updateTaxDocAfterEmployeeUpdate
AFTER UPDATE ON employee
FOR EACH ROW
BEGIN
  DECLARE done INT DEFAULT FALSE;
  DECLARE a CHAR(16);
  DECLARE b, c INT;
  DECLARE cur1 CURSOR FOR SELECT id,data FROM hr.employee;
  DECLARE cur2 CURSOR FOR SELECT i FROM hr.payroll;
  DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;

  OPEN cur1;
  OPEN cur2;

  read_loop: LOOP
    FETCH cur1 INTO a, b;
    FETCH cur2 INTO c;
    IF done THEN
      LEAVE read_loop;
    END IF;
    IF b < c THEN
      INSERT INTO test.t3 VALUES (a,b);
    ELSE
      INSERT INTO test.t3 VALUES (a,c);
    END IF;
  END LOOP;

  CLOSE cur1;
  CLOSE cur2;
END;
$$
delimiter ;