sqlsrv驱动增加parseKey方法

Library/Think/Db/Driver/Sqlsrv.php

@@ -96,6 +96,20 @@ class Sqlsrv extends Driver{
         return !empty($order)?  ' ORDER BY '.$order:' ORDER BY rand()';
     }
 
+    /**
+     * 字段名分析
+     * @access protected
+     * @param string $key
+     * @return string
+     */
+    protected function parseKey(&$key) {
+        $key   =  trim($key);
+        if(!preg_match('/[,\'\"\*\(\)\[.\s]/',$key)) {
+           $key = '['.$key.']';
+        }
+        return $key;   
+    }
+
     /**
      * limit
      * @access public