diff --git a/var/Widget/Backup.php b/var/Widget/Backup.php
index b7179537..33dc1c21 100644
--- a/var/Widget/Backup.php
+++ b/var/Widget/Backup.php
@@ -189,7 +189,12 @@ class Backup extends BaseOptions implements ActionInterface
         if (!empty($_FILES)) {
             $file = array_pop($_FILES);
 
-            if (0 == $file['error'] && is_uploaded_file($file['tmp_name'])) {
+            if(UPLOAD_ERR_NO_FILE == $file['error']) {
+                Notice::alloc()->set(_t('没有选择任何备份文件'), 'error');
+                $this->response->goBack();
+            }
+
+            if (UPLOAD_ERR_OK == $file['error'] && is_uploaded_file($file['tmp_name'])) {
                 $path = $file['tmp_name'];
             } else {
                 Notice::alloc()->set(_t('备份文件上传失败'), 'error');
@@ -270,7 +275,7 @@ class Backup extends BaseOptions implements ActionInterface
         }
 
         // 针对PGSQL重置计数
-        if (false !== strpos($this->db->getVersion(), 'pgsql')) {
+        if (false !== strpos(strtolower($this->db->getAdapterName()), 'pgsql')) {
             foreach ($this->lastIds as $table => $id) {
                 $seq = $this->db->getPrefix() . $table . '_seq';
                 $this->db->query('ALTER SEQUENCE ' . $seq . ' RESTART WITH ' . ($id + 1));