update vale not save in table laravel code example

Example 1: how to rollback if one table in laravel didn't save data successfully

DB::beginTransaction();
    try{
    here you can add your code to exicute and commit db transaction
    } catch (Exception $e) {
        DB::rollback();

    }

Example 2: old value on edit table laravel 6

//Get old value on edit page in laravel
value="{{old('title', $dog->title)}}"