diff --git a/tools/transfer.php b/tools/transfer.php
index 924b0fb175..af0b614b4e 100644
--- a/tools/transfer.php
+++ b/tools/transfer.php
@@ -74,6 +74,9 @@
         }
     }
 
+    $source = str_replace(array('mb_strtoupper', 'mb_strlen'), 
+        array('Typecho_Common::strToUpper', 'Typecho_Common::strLen'), $source);
+
     $tokens = token_get_all($source);
     $source = '';
 
diff --git a/var/CommonMark/DocParser.php b/var/CommonMark/DocParser.php
index 337b8f13f8..3bc4d7b6ad 100644
--- a/var/CommonMark/DocParser.php
+++ b/var/CommonMark/DocParser.php
@@ -63,7 +63,7 @@ protected static function detabLine($string)
 
         foreach ($parts as $part) {
             // Calculate number of spaces; insert them followed by the non-tab contents
-            $amount = 4 - mb_strlen($line, 'UTF-8') % 4;
+            $amount = 4 - Typecho_Common::strLen($line, 'UTF-8') % 4;
             $line .= str_repeat(' ', $amount) . $part;
         }
 
diff --git a/var/CommonMark/Reference/Reference.php b/var/CommonMark/Reference/Reference.php
index ee8ddeac5f..40ab7484ca 100644
--- a/var/CommonMark/Reference/Reference.php
+++ b/var/CommonMark/Reference/Reference.php
@@ -87,6 +87,6 @@ public static function normalizeReference($string)
         // leading/trailing whitespace
         $string = preg_replace('/\s+/', '', trim($string));
 
-        return mb_strtoupper($string, 'UTF-8');
+        return Typecho_Common::strToUpper($string, 'UTF-8');
     }
 }
diff --git a/var/Markdown.php b/var/Markdown.php
index 9b5e339961..c1d6d1d042 100644
--- a/var/Markdown.php
+++ b/var/Markdown.php
@@ -35,7 +35,7 @@ public function renderInline(CommonMark_Element_InlineElementInterface $inline)
  * @license GNU General Public License 2.0
  */
 class Markdown
-{
+{ 
     /**
      * convert 
      * 
diff --git a/var/Typecho/Common.php b/var/Typecho/Common.php
index 2b9cbc6a39..f7cb13fcb1 100644
--- a/var/Typecho/Common.php
+++ b/var/Typecho/Common.php
@@ -48,6 +48,17 @@ class Typecho_Common
      */
     public static $exceptionHandle;
 
+    /**
+     * 将字符串变成大写的回调函数
+     * 
+     * @param array $matches 
+     * @access public
+     * @return string
+     */
+    public static function __strToUpper($matches)
+    {
+        return strtoupper($matches[0]);
+    }
 
     /**
      * 将url中的非法xss去掉时的数组回调过滤函数
@@ -226,6 +237,7 @@ public static function exceptionHandle(Exception $exception)
         @ob_end_clean();
 
         if (defined('__TYPECHO_DEBUG__')) {
+            echo '<h1>' . $exception->getMessage() . '</h1>';
             echo nl2br($exception->__toString());
         } else {
             if (404 == $exception->getCode() && !empty(self::$exceptionHandle)) {
@@ -740,6 +752,23 @@ public static function strLen($str)
         }
     }
 
+    /**
+     * 获取大写字符串
+     * 
+     * @param string $str 
+     * @access public
+     * @return string
+     */
+    public static function strToUpper($str)
+    {
+        if (__TYPECHO_MB_SUPPORTED__) {
+            return mb_strtoupper($str, self::$charset);
+        } else {
+            return 'UTF-8' == strtoupper(self::$charset)
+                ? preg_replace_callback("/[a-z]+/u", array('Typecho_Common', '__strToUpper'), $str) : strtoupper($str);
+        }
+    }
+
     /**
      * 检查是否为合法的编码数据
      *
diff --git a/var/Typecho/Db/Query.php b/var/Typecho/Db/Query.php
index 3a7f300693..fabd11e1fb 100644
--- a/var/Typecho/Db/Query.php
+++ b/var/Typecho/Db/Query.php
@@ -111,26 +111,9 @@ private function filterColumn($str)
         $split = '';
         $quotes = 0;
 
-        // fix issue #288
-        $inStr = false;
-
         for ($i = 0; $i < $length; $i ++) {
             $cha = $str[$i];
 
-            if (false !== strpos("'\"", $cha)) {
-                $inStr = !$inStr;
-
-                if (!$inStr) {
-                    $result .= $cha;
-                    continue;
-                }
-            }
-
-            if ($inStr) {
-                $result .= $cha;
-                continue;
-            }
-
             if (ctype_alnum($cha) || false !== strpos('_*', $cha)) {
                 if (!$lastIsAlnum) {
                     if ($quotes > 0 && !ctype_digit($word) && '.' != $split
@@ -374,11 +357,12 @@ public function rows(array $rows)
      *
      * @param string $key 栏目名称
      * @param mixed $value 指定的值
+     * @param bool $escape 是否转义
      * @return Typecho_Db_Query
      */
-    public function expression($key, $value)
+    public function expression($key, $value, $escape = true)
     {
-        $this->_sqlPreBuild['rows'][$this->filterColumn($key)] = $this->filterColumn($value);
+        $this->_sqlPreBuild['rows'][$this->filterColumn($key)] = $escape ? $this->filterColumn($value) : $value;
         return $this;
     }