add effect row

engine/lib/Db.class.php

@@ -91,6 +91,9 @@ class Db{
 	public function lastId(){
 		return $this->mysql->lastId();
 	}
+	public function affectedRow(){
+		return $this->mysql->affectedRow();
+	}
 	public function error(){
 		return $this->mysql->error();
 	}

engine/lib/Mysql.class.php

@@ -119,7 +119,9 @@ class Mysql{
 	        unset( $this->dbWrite );
         }
     }
-    
+    public function affectedRow(){
+	    return mysqli_affected_rows( $this->dbWrite );
+    }
     public function escape( $str ){
         if( isset($this->dbRead)) $db = $this->dbRead ;
         elseif( isset($this->dbWrite) )    $db = $this->dbWrite;