sql 如下
SHOW COLUMNS FROM `t_order` [ RunTime:0.001017s ]
SELECT COUNT(*) AS tp_count FROM `t_order` WHERE ( `status` = '111' ) AND ( (`ordertime` >= '2013-02-20 00:00:00') AND (`ordertime` <= '2013-02-20 23:59:59') ) LIMIT 1 [ RunTime:0.000176s ]
SELECT * FROM `t_order` WHERE ( `status` = '111' ) AND ( (`ordertime` >= '2013-02-20 00:00:00') AND (`ordertime` <= '2013-02-20 23:59:59') ) ORDER BY ordertime desc LIMIT 0,15 [ RunTime:0.000145s ]
SELECT COUNT(*) AS tp_count FROM `t_order` WHERE ( `status` = '111' ) AND ( (`ordertime` >= '2013-02-20 00:00:00') AND (`ordertime` <= '2013-02-20 23:59:59') ) LIMIT 1 [ RunTime:0.000126s ]
SELECT SUM(bill) AS tp_sum FROM `t_order` WHERE ( `status` = '111' ) AND ( (`ordertime` >= '2013-02-20 00:00:00') AND (`ordertime` <= '2013-02-20 23:59:59') ) LIMIT 1 [ RunTime:0.000127s ]
错误提示如下
[2] strtoupper() expects parameter 1 to be string, array given /home/data/pay/ThinkPHP/Lib/Core/Db.class.php 第 472 行

请问是否是个bug？