diff --git a/Library/Think/Model/Lite.php b/Library/Think/Model/Lite.php
deleted file mode 100644
index d6041092..00000000
--- a/Library/Think/Model/Lite.php
+++ /dev/null
@@ -1,240 +0,0 @@
-<?php
-// +----------------------------------------------------------------------
-// | TOPThink [ WE CAN DO IT JUST THINK ]
-// +----------------------------------------------------------------------
-// | Copyright (c) 2011 http://topthink.com All rights reserved.
-// +----------------------------------------------------------------------
-// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
-// +----------------------------------------------------------------------
-// | Author: liu21st <liu21st@gmail.com>
-// +----------------------------------------------------------------------
-
-namespace Think\Model;
-
-class Lite {
-    // 当前数据库操作对象
-    protected $db               =   null;
-    // 数据库名称
-    protected $dbName           =   '';
-    //数据库配置
-    protected $connection       =   '';
-    // 数据表前缀
-    protected $tablePrefix      =   '';
-    // 数据表名（不包含表前缀）
-    protected $tableName        =   '';
-    // 实际数据表名（包含表前缀）
-    protected $trueTableName    =   '';
-    // 最近错误信息
-    protected $error            =   '';
-    // 配置参数
-    protected $config =   [];
-
-    /**
-     * 架构函数
-     * 取得DB类的实例对象 字段检查
-     * @access public
-     * @param string $name 模型名称
-     * @param array $config 模型配置
-     */
-    public function __construct($name='',$config=[]) {
-        // 传入模型参数
-        if(!empty($name)){
-            $this->name =   $name;
-        }elseif(empty($this->name)){
-            $this->name =   $this->getModelName();
-        }
-        if(strpos($this->name,'.')) { // 支持 数据库名.模型名的 定义
-            list($this->dbName,$this->name) = explode('.',$this->name);
-        }
-
-        if(isset($config['table_prefix'])) {
-            $this->tablePrefix  =   $config['table_prefix'];
-        }
-        if(isset($config['connection'])) {
-            $this->connection   =   $config['connection'];
-        }
-        if(isset($config['table_name'])) {
-            $this->tableName    =   $config['table_name'];
-        }
-        if(isset($config['true_table_name'])) {
-            $this->trueTableName    =   $config['true_table_name'];
-        }
-        if(isset($config['db_name'])) {
-            $this->dbName    =   $config['db_name'];
-        }
-
-        // 设置表前缀
-        if(empty($this->tablePrefix)) {
-            $this->tablePrefix  =   is_null($this->tablePrefix)?'':C('database.prefix');
-        }
-
-        // 数据库初始化操作
-        // 获取数据库操作对象
-        // 当前模型有独立的数据库连接信息
-        $this->db(0,$this->connection);
-    }
-
-    /**
-     * 得到当前的数据对象名称
-     * @access public
-     * @return string
-     */
-    public function getModelName() {
-        if(empty($this->name))
-            $this->name =   substr(get_class($this),0,-5);
-        return $this->name;
-    }
-
-    /**
-     * 得到完整的数据表名
-     * @access public
-     * @return string
-     */
-    public function getTableName() {
-        if(empty($this->trueTableName)) {
-            $tableName  = !empty($this->tablePrefix) ? $this->tablePrefix : '';
-            if(!empty($this->tableName)) {
-                $tableName .= $this->tableName;
-            }else{
-                $tableName .= parse_name($this->name);
-            }
-            $this->trueTableName    =   strtolower($tableName);
-        }
-        return (!empty($this->dbName)?$this->dbName.'.':'').$this->trueTableName;
-    }
-
-
-    /**
-     * SQL查询
-     * @access public
-     * @param string $sql  SQL指令
-     * @param array $binding  参数绑定
-     * @return mixed
-     */
-    public function query($sql,$binding=[]) {
-        $sql  =   $this->parseSql($sql);
-        return $this->db->query($sql,$binding);
-    }
-
-    /**
-     * 执行SQL语句
-     * @access public
-     * @param string $sql  SQL指令
-     * @param array $binding  参数绑定
-     * @return false | integer
-     */
-    public function execute($sql,$binding=[]) {
-        $sql    =   $this->parseSql($sql);
-        return $this->db->execute($sql,$binding);
-    }
-
-    /**
-     * 解析SQL语句
-     * @access public
-     * @param string $sql  SQL指令
-     * @return string
-     */
-    protected function parseSql($sql) {
-        // 分析表达式
-        $sql    =   strtr($sql,array('__TABLE__'=>$this->getTableName(),'__PREFIX__'=>$this->config['DB_PREFIX']));
-        $this->db->setModel($this->name);
-        return $sql;
-    }
-
-    /**
-     * 切换当前的数据库连接
-     * @access public
-     * @param integer $linkNum  连接序号
-     * @param mixed $config  数据库连接信息
-     * @return Model
-     */
-    public function db($linkNum='',$config=''){
-        if(''===$linkNum && $this->db) {
-            return $this->db;
-        }
-        static $_linkNum    =   [];
-        static $_db = [];
-        if(!isset($_db[$linkNum]) || (isset($_db[$linkNum]) && $config && $_linkNum[$linkNum]!=$config) ) {
-            // 创建一个新的实例
-            if(!empty($config) && is_string($config) && false === strpos($config,'/')) { // 支持读取配置参数
-                $config  =  Config::get($config);
-            }
-            $_db[$linkNum]            =    \Think\Db::instance($config,true);
-        }elseif(NULL === $config){
-            $_db[$linkNum]->close(); // 关闭数据库连接
-            unset($_db[$linkNum]);
-            return ;
-        }
-        // 记录连接信息
-        $_linkNum[$linkNum] =   $config;
-        // 切换数据库连接
-        $this->db   =    $_db[$linkNum];
-        return $this;
-    }
-
-    /**
-     * 启动事务
-     * @access public
-     * @return void
-     */
-    public function startTrans() {
-        $this->commit();
-        $this->db->startTrans();
-        return ;
-    }
-
-    /**
-     * 提交事务
-     * @access public
-     * @return boolean
-     */
-    public function commit() {
-        return $this->db->commit();
-    }
-
-    /**
-     * 事务回滚
-     * @access public
-     * @return boolean
-     */
-    public function rollback() {
-        return $this->db->rollback();
-    }
-
-    /**
-     * 返回模型的错误信息
-     * @access public
-     * @return string
-     */
-    public function getError(){
-        return $this->error;
-    }
-
-    /**
-     * 返回数据库的错误信息
-     * @access public
-     * @return string
-     */
-    public function getDbError() {
-        return $this->db->getError();
-    }
-
-    /**
-     * 返回最后插入的ID
-     * @access public
-     * @return string
-     */
-    public function getLastInsID() {
-        return $this->db->getLastInsID();
-    }
-
-    /**
-     * 返回最后执行的sql语句
-     * @access public
-     * @return string
-     */
-    public function getLastSql() {
-        return $this->db->getLastSql($this->name);
-    }
-
-}
diff --git a/base.php b/base.php
index 5733573c..7f744082 100644
--- a/base.php
+++ b/base.php
@@ -92,6 +92,16 @@ function D($name='',$layer='Model') {
     return Think\Loader::model($name,$layer);
 }
 
+/**
+ * 实例化数据库类
+ * @param array $config 数据库配置参数
+ * @param boolean $lite 是否lite连接
+ * @return object
+ */
+function db($config=[],$lite=false) {
+    return Think\Db::instance($config,$lite);
+}
+
 /**
  * 实例化控制器 格式：[模块/]控制器
  * @param string $name 资源地址