Question

我将日期与一些静态值进行比较，这里的一些变量是我的代码

IF v_next_date >= STR_TO_DATE('15/2/2014', '%m/%d/%Y') then 
      SET v_next_date = DATE_FORMAT(v_date,'%2000-%m-%d');
elseif v_next_date = v_date then
 LEAVE last_update;
else
  SET v_next_date = DATE_ADD(v_next_date,INTERVAL 1 MONTH);
end if;

首先，如果我想比较静态日期，然后将v_date分配给v_next_date，那么年份应为2000。第二，我想比较2个变量第三，如果我想将下个月的相同日期分配给v_next_date。

编辑：我的程序没有完成，我认为比较或作业存在问题

编辑：这是我的完整代码（程序）：

CREATE PROCEDURE accidents.`task_7_proce`()
BEGIN

  DECLARE v_finished INTEGER DEFAULT 0;
  DECLARE v_pkid INTEGER;
  DECLARE v_mine INTEGER;
  DECLARE v_date DATETIME;
  DECLARE v_lat INTEGER;
  DECLARE v_lng INTEGER;
  DECLARE v_next_date DATE;
  DECLARE i INTEGER DEFAULT 0;
  DECLARE msg varchar(100) DEFAULT 'no message';

DECLARE weather_cursor CURSOR FOR select pkid, mine_id, accident_dt, lat, lng
                              from test_unfilteredfull
                              where pkid = 46953;
DECLARE CONTINUE HANDLER 
    FOR NOT FOUND SET v_finished = 1;
OPEN weather_cursor;


    FETCH weather_cursor INTO v_pkid, v_mine, v_date, v_lat, v_lng;

    SET v_next_date = DATE_ADD(v_date,INTERVAL 1 MONTH);

last_update: loop  


    -- ******** update statement **************
      UPDATE mytable mt INNER JOIN myvalues mv
      ON mv.date = v_next_date and
      mt.pkid = v_pkid 
      SET mt.tmax = mv.tmax, mt.tmin = mv.tmin, mt.dayl= mv.dayl ,
      mt.prcp = mv.prcp , mt.srad = mv.srad, mt.swe=mv.swe, mt.vp=mv.vp
      WHERE mv.Longitude_MAX >= v_lng and 
      mv.Longitude_MIN <= v_lng and 
      mv.Latitude_MAX >=  v_lat and  
      mv.Latitude_MIN <= v_lat;

if ROW_COUNT() > 0 then
   SET msg = 'Successfully updated!';
   LEAVE last_update;
end if;

IF v_next_date >= STR_TO_DATE('2/15/2014', '%m/%d/%Y') then 
  SET v_next_date = DATE_FORMAT(v_date,'%2000-%m-%d');
elseif v_next_date = v_date then
  LEAVE last_update;
else
  SET v_next_date = DATE_ADD(v_next_date,INTERVAL 1 MONTH);

end if;

END LOOP last_update;
CLOSE weather_cursor;
commit;  

END;

mysql过程中的日期比较

0 个答案: