mysql 优化，去掉重复代码

/*将报告期逗号分隔解析存放临时表中*/
-- '2007-06-30,2000-06-30'
set v_ReportDate = trim(v_ReportDate);
set v_ReportDate = CONCAT(v_ReportDate, ',');   -- 在v_ReportDate后面加一个逗号，就可以去掉后面的重复代码
set i = instr(v_ReportDate,',');
WHILE i>=1 DO
set dt = left(v_ReportDate,i-1);
set dts = concat(year(dt),'-',month(dt)-2,'-01');
set dtd = concat(year(dt),'-01-01');
insert into stk_finment_tmpdate values (dt, DATE_ADD(dt,INTERVAL 1 year), dts, date_add(dts,interval 1 year), dtd, date_add(dtd,interval 1 year));
set v_ReportDate = SUBSTRING(v_ReportDate, i+1);
set i = instr(v_ReportDate,',');
END WHILE;
/*IF(v_ReportDate != ',') then
set dt = v_ReportDate;
set dts = concat(year(dt),'-',month(dt)-2,'-01');
set dtd = concat(year(dt),'-01-01');
insert into stk_finment_tmpdate values (dt, DATE_ADD(dt,INTERVAL 1 year), dts, date_add(dts,interval 1 year), dtd, date_add(dtd,interval 1 year));
end IF;*/