diff --git a/library/think/Db.php b/library/think/Db.php
index 00f719e0..3e613f7a 100644
--- a/library/think/Db.php
+++ b/library/think/Db.php
@@ -36,7 +36,7 @@ use think\db\Query;
  * @method integer update(array $data) static 更新记录
  * @method integer delete(mixed $data = null) static 删除记录
  * @method boolean chunk(integer $count, callable $callback, string $column = null) static 分块获取数据
- * @method mixed query(string $sql, array $bind = [], boolean $fetch = false, boolean $master = false, mixed $class = null) static SQL查询
+ * @method mixed query(string $sql, array $bind = [], boolean $master = false, bool $pdo = false) static SQL查询
  * @method integer execute(string $sql, array $bind = [], boolean $fetch = false, boolean $getLastInsID = false, string $sequence = null) static SQL执行
  * @method Paginator paginate(integer $listRows = 15, mixed $simple = null, array $config = []) static 分页查询
  * @method mixed transaction(callable $callback) static 执行数据库事务
@@ -44,6 +44,8 @@ use think\db\Query;
  * @method void commit() static 用于非自动提交状态下面的查询提交
  * @method void rollback() static 事务回滚
  * @method boolean batchQuery(array $sqlArray) static 批处理执行SQL语句
+ * @method string quote(string $str) static SQL指令安全过滤
+ * @method string getLastInsID($sequence = null) static 获取最近插入的ID
  */
 class Db
 {
diff --git a/library/think/db/Connection.php b/library/think/db/Connection.php
index bc67b1d8..5e790c34 100644
--- a/library/think/db/Connection.php
+++ b/library/think/db/Connection.php
@@ -340,13 +340,9 @@ abstract class Connection
     /**
      * 执行查询 返回数据集
      * @access public
-     * @param string    $sql sql指令
-     * @param array     $bind 参数绑定
-     * @param bool      $master 是否在主服务器读操作
-     * @param bool      $class 是否返回PDO对象
      * @param string        $sql sql指令
      * @param array         $bind 参数绑定
-     * @param boolean       $master 是否在主服务器读操作
+     * @param bool          $master 是否在主服务器读操作
      * @param bool          $pdo 是否返回PDO对象
      * @return mixed
      * @throws BindParamException