oracle:

CREATE OR REPLACE FUNCTION GET_HTBH

   RETURN VARCHAR2
IS
   RESULT   VARCHAR2 (14);
BEGIN
   SELECT    TO_CHAR (SYSDATE, 'yyyy')
          || TO_CHAR (SYSDATE, 'mm')
          || TO_CHAR (SYSDATE, 'dd')
          || TRIM (TO_CHAR (SEQ_HTBH.NEXTVAL, '000000'))
     INTO RESULT
     FROM DUAL;


   --select '2006456456' into Result from dual;
   --Result := '2006123123';
   RETURN (RESULT);

END GET_HTBH;

mysql：

CREATE FUNCTION GET_HTBH()
   RETURNS VARCHAR(14)  
BEGIN
DECLARE RESULT   VARCHAR(14);
 select CONCAT((select DATE_FORMAT(NOW(),'%Y%m%d') from dual),LPAD((SEQ_HTBH()),6,'0'))
     INTO RESULT
     FROM DUAL;
   -- select '2006456456' into Result from dual;
   -- Result := '2006123123';
   RETURN RESULT;
END;

轉mysql注意事項 1 過程名要有（ ） 2 end 不要過程名 3 沒as  4 DECLARE 要在begin下面 5 return  換成returns