diff --git a/library/think/Model.php b/library/think/Model.php
index 238a5d50..e5de7120 100644
--- a/library/think/Model.php
+++ b/library/think/Model.php
@@ -546,10 +546,10 @@ abstract class Model implements \JsonSerializable, \ArrayAccess
     }
 
     /**
-     * 创建数据并写入
+     * 写入数据
      * @access public
-     * @param mixed $data 数据 支持数组或者对象
-     * @return void
+     * @param array $data 数据数组
+     * @return integer
      */
     public static function create($data = [])
     {
@@ -557,6 +557,18 @@ abstract class Model implements \JsonSerializable, \ArrayAccess
         return $model->isUpdate(false)->save($data);
     }
 
+    /**
+     * 更新数据
+     * @access public
+     * @param array $data 数据数组
+     * @return integer
+     */
+    public static function update($data = [])
+    {
+        $model = new static();
+        return $model->isUpdate(true)->save($data);
+    }
+
     /**
      * 查找单条记录
      * @access public
@@ -690,20 +702,6 @@ abstract class Model implements \JsonSerializable, \ArrayAccess
         return $model::where($foreignKey, $this->data[$localKey]);
     }
 
-    /**
-     * 实例化模型
-     * @access public
-     * @param array $config  配置参数
-     * @return object
-     */
-    public static function instance()
-    {
-        if (is_null(self::$instance)) {
-            self::$instance = new static();
-        }
-        return self::$instance;
-    }
-
     /**
      * 初始化数据库对象
      * @access protected
diff --git a/library/think/db/Driver.php b/library/think/db/Driver.php
index 474d19a4..deffc74f 100644
--- a/library/think/db/Driver.php
+++ b/library/think/db/Driver.php
@@ -1324,6 +1324,7 @@ abstract class Driver
             return [];
         }
         $fields = array_keys($bind);
+        $result = [];
         foreach ($data as $key => $val) {
             if (!in_array($key, $fields, true)) {
                 if ($this->config['fields_strict']) {