sql存储过程实例--动态根据表数据复制一个表的数

-- 创建一个 名为sub_track的存储过程
CREATE PROCEDURE sub_track()
begin
  declare i int;  -- 定义 循环变量i
  set @imei =0;  -- 定义imei两位
  set @t_count=0; -- 定义 表有多少条记录变量
  SET i=0;
  SELECT COUNT()INTO @t_count FROM track;        -- 获取表的条数
while i <= @t_count do                   -- 循环
 SELECT RIGHT(mac_id,2) INTO @imei FROM track ORDER BY gpstime DESC LIMIT i, 1;  -- 获取 imei 两位 
  set @imei =CONVERT(@imei,SIGNED);                       -- 转为数字
  -- SQL 语句
  set @sql1=" (
               mac_id,mac_type,channel,type,x,y,gpstime,bvalid,speed,dir,s1,s2,s3,s4,ins_date,imagefile,battery
             ) 
            SELECT 
               mac_id,mac_type,channel,type,x,y,gpstime,bvalid,speed,dir,s1,s2,s3,s4,ins_date,imagefile,battery
            FROM track 
            ORDER BY
              gpstime DESC
            LIMIT ";
  set @inset_sql=CONCAT("INSERT INTO track_",@imei,@sql1,i,",",1);    -- 拼接完整的插入 sql语句
  PREPARE insert_track from @inset_sql;                  -- 预编译
  EXECUTE insert_track;                          -- 执行sql语句
  set i=i+1;
-- 结束循环
end while;
  mit;
end
-- 执行存储过程
CALL sub_track();
@flm