mysql 存储过程 调用问题
同样一个存储过程在windows环境下通过SQLyog调试可以正常运行，但是在linux下同样用SQLyog远程登录运行就出现如下错误:

Error Code : 1243
Unknown prepared statement handler (stmt) given to EXECUTE
  
系统环境配置：
linux radhat5.5
mysql5.6.2-m5-log

存储过程源码如下:
/*Stored Proc: con_record*/
---------------------------

Create Procedure:
-----------------

CREATE DEFINER=`site`@`localhost` PROCEDURE `con_record`(IN count int(6),
  IN recordtime varchar(20),
  IN bic varchar(12))
BEGIN
  SET @counts = count;
  SET @sql = 'select result.agencyBIC as agencybic,';
  SET @i = 0;
  WHILE @i < @counts
  DO
  SET @sql = CONCAT(@sql, 'format(sum(result.rtime');
  SET @sql = CONCAT(@sql, @i + 1);
  SET @sql = CONCAT(@sql, '),0) as time');
  SET @sql = CONCAT(@sql, @i + 1);
  IF @i != (@counts - 1)
  THEN
  SET @sql = CONCAT(@sql, ",");
  END IF;
  SET @i = @i + 1;
  END WHILE;
  SET @sql = CONCAT(@sql, ' from (select agencyBIC,record_time,');
  SET @j = 0;
  WHILE @j < @counts
  DO
  SET @sql = CONCAT(@sql,' CASE HOUR(record_time) WHEN ');
  SET @sql = CONCAT(@sql,@j*2);
  SET @sql = CONCAT(@sql,' THEN connect ELSE 0 END as rtime');
  SET @sql = CONCAT(@sql,@j+1);
   
  IF @j != (@counts - 1)
  THEN
  SET @sql = CONCAT(@sql, ',');
  END IF;
  SET @j = @j + 1;
  END WHILE;
  SET @sql = CONCAT(@sql,' FROM connect_record t where record_time like ? ');  
  IF LENGTH(bic) > 0
  THEN  
  SET @sql = CONCAT(@sql,'and agencyBIC = ? ');  
  END IF;
   
  SET @sql = CONCAT(@sql,' ) result group by agencyBIC');
   

   
  IF LENGTH(recordtime) = 0 
  THEN  
  SET @r_time = CONCAT(SUBSTRING(now(),1,10),'%');  
  ELSE  
  SET @r_time = CONCAT(SUBSTRING(recordtime,1,10),'%');  
  END IF;
  IF LENGTH(bic) > 0
  THEN  
  EXECUTE stmt USING @r_time,@agencybic;
  ELSE
  EXECUTE stmt USING @r_time;  
  END IF;  
  END

sql_mode:
---------

NO_AUTO_VALUE_ON_ZERO

------解决方案--------------------
在EXECUTE 前要PREPARE
PREPARE stmt FROM @SQL;
EXECUTE stmt;
------解决方案--------------------
mysql> PREPARE stmt1 FROM 'SELECT SQRT(POW(?,2) + POW(?,2)) AS hypotenuse';
mysql> SET @a = 3;
mysql> SET @b = 4;
mysql> EXECUTE stmt1 USING @a, @b;
+------------+
| hypotenuse |
+------------+
| 5 |
+------------+
mysql> DEALLOCATE PREPARE stmt1;