改进复合查询

Author: liu21st

ThinkPHP/Lib/Core/Db.class.php

@@ -550,7 +550,7 @@ protected function parseThinkWhere($key,$val) {
                 break;
             case '_complex':
                 // 复合查询条件
-                $whereStr = substr($this->parseWhere($val),6);
+                $whereStr   =   is_string($val)? $val : substr($this->parseWhere($val),6);
                 break;
             case '_query':
                 // 字符串模式查询条件