mybatis+mysql 使用存储过程生成流水号的实现代码

使用存储过程，在操作数据库时开启事务，避免并发时同时操作造成数据重复

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; 
  
  SELECT sValue INTO tsValue FROM sys_sno WHERE sCode=tsCode; 
  SELECT sQz INTO tsQZ FROM sys_sno WHERE sCode=tsCode ; 
 -- 因子表中没有记录，插入初始值  
  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;
   -- 判断年月是否需要更新
   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);