Mybatis+mysql uses stored procedures to generate serial number implementation code

CREATE DEFINER=`root`@`localhost` PROCEDURE `GetSerialNo`(IN tsCode VARCHAR(50),OUT result VARCHAR(200) )
BEGIN 
 DECLARE tsValue VARCHAR(50); 
 DECLARE tdToday VARCHAR(20);  
 DECLARE nowdate VARCHAR(20);  
 DECLARE tsQZ VARCHAR(50); 
 DECLARE t_error INTEGER DEFAULT 0; 
 DECLARE CONTINUE HANDLER FOR SQLEXCEPTION SET t_error=1; 
 START TRANSACTION; 
  /* UPDATE sys_sno SET sValue=sValue WHERE sCode=tsCode; */
  SELECT sValue INTO tsValue FROM sys_sno WHERE sCode=tsCode; 
  SELECT sQz INTO tsQZ FROM sys_sno WHERE sCode=tsCode; 
 -- There is no record in the factor table, insert the initial value IF tsValue IS NULL THEN 
   SELECT CONCAT(DATE_FORMAT(NOW(),'%y%m'),'0001') INTO tsValue; 
   UPDATE sys_sno SET sValue=tsValue WHERE sCode=tsCode; 
   SELECT CONCAT(tsQZ,tsValue) INTO result; 
  ELSE     
   SELECT SUBSTRING(tsValue,1,4) INTO tdToday; 
   SELECT CONVERT(DATE_FORMAT(NOW(),'%y%m'),SIGNED) INTO nowdate;
   -- Determine whether the year and month need to be updated IF tdToday = nowdate THEN 
    SET tsValue=CONVERT(tsValue,SIGNED) + 1; 
   ELSE 
    SELECT CONCAT(DATE_FORMAT(NOW(),'%y%m') ,'0001') INTO tsValue; 
   END IF; 
   UPDATE sys_sno SET sValue = tsValue WHERE sCode = tsCode; 
   SELECT CONCAT(tsQZ,tsValue) INTO result; 
  END IF; 
  IF t_error =1 THEN 
  ROLLBACK; 
  SET result = 'Error'; 
  ELSE 
  COMMIT; 
  END IF; 
  SELECT result ;  
END;
dao
Integer getFaultNo(Map<String, String> parameterMap);

<update id="getFaultNo" parameterMap="getFaultMap" statementType="CALLABLE">
  CALL GetSerialNo(?,?)
 </update>
 <!--
  parameterMap.put("tsCode", 0);
  parameterMap.put("result", -1);
  -->
 <parameterMap type="java.util.Map" id="getFaultMap">
  <parameter property="tsCode" mode="IN" jdbcType="VARCHAR"/>
  <parameter property="result" mode="OUT" jdbcType="VARCHAR"/>
 </parameterMap>

Map<String, String> parameterMap = new HashMap<String, String>();
  parameterMap.put("tsCode", "a");
  parameterMap.put("result", "-1");
  faultMapper.getFaultNo(parameterMap);
  // insert failure log (main table)
  if (!parameterMap.get("result").equals("-1") && 
    !parameterMap.get("result").equals("Error")) {
   //Success} else {
   throw new RuntimeException();
  }