error in :select * from article where LENGTH(a_image)>6 and a_date<=now() and a_type=5 order by a_date desc limit 312,8
param_array:Array ( )
SQLSTATE[HY000]: General error: 1030 Got error 22 from storage engine

0 D:\xampp\htdocs\www.isshine.com\var\www\html\itisshine.hiiir.com\trunk\public\libs\Data\PDO\PDO.php(15): PDO->prepare('select * from...')
1 D:\xampp\htdocs\www.isshine.com\var\www\html\itisshine.hiiir.com\trunk\public\libs\Data\PDO\PDO.php(124): MySqlPDO::query('select * from...', Array)
2 D:\xampp\htdocs\www.isshine.com\var\www\html\itisshine.hiiir.com\trunk\public\libs\Data\PDO\ArticlePDO.php(37): MySqlPDO::getList('40', 8, '', 'LENGTH(a_image)...', 'a_date desc', 'article', Array)
3 D:\xampp\htdocs\www.isshine.com\var\www\html\itisshine.hiiir.com\trunk\public\libs\Data\Service\Article.php(372): ArticlePDO->getList('40', 8, 'LENGTH(a_image)...', Array, '', 'a_date desc')
4 D:\xampp\htdocs\www.isshine.com\var\www\html\itisshine.hiiir.com\trunk\public\libs\Data\Service\Article.php(417): Article->GetModelList('40', 8, 'LENGTH(a_image)...', Array, '', 'a_date desc')
5 D:\xampp\htdocs\www.isshine.com\var\www\html\itisshine.hiiir.com\trunk\public\topic.php(16): Article->getTopArticlePage('40', 8, 5, '', Array, NULL)
6 D:\xampp\htdocs\www.isshine.com\var\www\html\itisshine.hiiir.com\trunk\public\libs\web\BaseAction.php(413): topic->doGet(NULL)
7 D:\xampp\htdocs\www.isshine.com\var\www\html\itisshine.hiiir.com\trunk\public\topic.php(27): NoLoginBaseAction->ProcessRequest()
8 {main}