这个存储过程没有插入记录有什么问题

Question

存储过程：

DELIMITER $$

USE `test`$$

DROP PROCEDURE IF EXISTS `UpdateRelatedAccounts`$$

CREATE DEFINER=`root`@`localhost` PROCEDURE `UpdateRelatedAccounts`()
BEGIN 
    DECLARE ssn_sel_id VARCHAR(255) DEFAULT 0;
    DECLARE primary_sel_id CHAR(36) DEFAULT 0;
    DECLARE secondary_sel_rel CHAR(36) DEFAULT 0;
    DECLARE no_more_rows BOOLEAN;
    DECLARE num_rows INT DEFAULT 0;

  DECLARE ssn_all_cur CURSOR FOR
  SELECT ac.ssn, ac.id AS primary_id, ac_b.id AS secondary_id FROM ssn ac LEFT JOIN ssn ac_b ON  ac.ssn =  ac_b.ssn WHERE ac.ssn NOT IN ('','000-00-0000') AND ac.id != ac_b.id;

 DECLARE CONTINUE HANDLER FOR NOT FOUND SET no_more_rows = TRUE;

 OPEN ssn_all_cur;
 SELECT FOUND_ROWS() INTO num_rows;
    the_loop: LOOP
        FETCH  ssn_all_cur
        INTO ssn_sel_id, primary_sel_id, secondary_sel_rel;

        IF no_more_rows THEN
        CLOSE ssn_all_cur;
        LEAVE the_loop;
        END IF;     
      INSERT INTO `ssn_related` ( `ssn_primary`, `ssn_related` ) VALUES ( '44','44'); -- ( primary_sel_id, secondary_sel_rel );

  END LOOP the_loop;    
END$$

DELIMITER ;

SSN表的结构是：

CREATE TABLE `ssn` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `ssn` varchar(11) DEFAULT NULL,
  `name` varchar(25) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=11 DEFAULT CHARSET=latin1;