diff --git a/src/Libs/ModelMySQL.php b/src/Libs/ModelMySQL.php
index 3696569..87c683e 100644
--- a/src/Libs/ModelMySQL.php
+++ b/src/Libs/ModelMySQL.php
@@ -17,16 +17,15 @@ use mysqli;
 
 class ModelMySQL {
 
-    public $id;
-    protected $toNull = [];
-
-    static protected $primaryKey = 'id';
-    static protected $ignoreSave = ['id'];
-    static protected $forceSave = [];
-    static protected $table;
-    static protected $tableSufix = 's';
-    static protected $db;
-    static protected $querySelect = [
+    public           int     $id;
+    protected        array   $toNull      = [];
+    static protected string  $primaryKey  = 'id';
+    static protected array   $ignoreSave  = ['id'];
+    static protected array   $forceSave   = [];
+    static protected string  $table;
+    static protected string  $tableSufix  = 's';
+    static protected ?mysqli $db          = null;
+    static protected array   $querySelect = [
         'select'              => ['*'],
         'where'               => '',
         'from'                => '',