修复文献管理错误

application/admin/controllers/DataController.php

@@ -560,7 +560,7 @@ class Admin_DataController extends Zend_Controller_Action
 				if ($form->isValid($formdata)) {
 					$sql="select id from reference where reference=?";
 					$row=$this->db->query($sql,array($formdata['reference']));
-					if (!$row) 
+					if ($row) 
 					{
 						//更新文献信息
 						$sql="update reference set reference=?,link=? where id=?";