write query in laravel code example

Example 1: laravel chunk select

DB::table('users')->chunk(100, function($users)
{
    foreach ($users as $user)
    {
        //
    }
});

Example 2: TRANSACTON LARAVEL QUERY BUILDER

DB::beginTransaction();

try {
    DB::insert(...);    
    DB::commit();
} catch (\Throwable $e) {
    DB::rollback();
    throw $e;
}