异常类规范 增加异常类 改进Query类的value和column的缓存冲突问题

library/think/db/exception/ModelNotFoundException.php

@@ -0,0 +1,38 @@
+<?php
+// +----------------------------------------------------------------------
+// | ThinkPHP [ WE CAN DO IT JUST THINK ]
+// +----------------------------------------------------------------------
+// | Copyright (c) 2006~2016 http://thinkphp.cn All rights reserved.
+// +----------------------------------------------------------------------
+// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
+// +----------------------------------------------------------------------
+// | Author: 麦当苗儿 <zuojiazi@vip.qq.com> <http://zjzit.cn>
+// +----------------------------------------------------------------------
+
+namespace think\db\exception;
+
+use think\db\DbException;
+
+class ModelNotFoundException extends DbException 
+{
+    protected $model;
+
+    /**
+     * 构造方法
+     * @param string $message
+     * @param string $model
+     */
+    public function __construct($message, $model = '', Array $config = [])
+    {
+        $this->message  = $message;
+        $this->model    = $model;
+
+        $this->setData('Database Config', $config);
+    }
+
+    public function getModel()
+    {
+        return $this->model;
+    }
+
+}