SQL Server DatabaseSeeder and Seeders in Laravel 4.2

DatabaseSeeder.php

<?php

class DatabaseSeeder extends Seeder {

  /**
   * Run the database seeds.
   *
   * @return void
   */
  public function run()
  {
    Eloquent::unguard();

    // DB::unprepared ('EXEC sp_msforeachtable "ALTER TABLE ? NOCHECK CONSTRAINT all"');

    DB::table('contato_importacoes')->delete();

    $this->call('EscolaridadesTableSeeder');

    // DB::unprepared ('EXEC sp_msforeachtable "ALTER TABLE ? WITH CHECK CHECK CONSTRAINT all"');
  }

}

SalasTableSeeder.php

<?php

// Composer: "fzaninotto/faker": "v1.3.0"
use Faker\Factory as Faker;

class SalasTableSeeder extends Seeder {

  public function run()
  {
    // DB::unprepared ('EXEC sp_msforeachtable "ALTER TABLE ? NOCHECK CONSTRAINT all"');
    DB::unprepared ('SET IDENTITY_INSERT tb_salas ON');
    DB::table('salas')->delete();

    $salas = array(
      array(
        'id' => 1,
        'nome' => 'Sala 1',
        'descricao' => 'Sala 1',
        'lotacao' => 30,
        'ativo' => 1,
        'created_at' => date('Y-m-d H:i:s', time()),
        'updated_at' => date('Y-m-d H:i:s', time()),
        'deleted_at' => NULL
      ),
      array(
        'id' => 2,
        'nome' => 'Sala 2',
        'descricao' => 'Sala 2',
        'lotacao' => 30,
        'ativo' => 1,
        'created_at' => date('Y-m-d H:i:s', time()),
        'updated_at' => date('Y-m-d H:i:s', time()),
        'deleted_at' => NULL
      ),
      array(
        'id' => 3,
        'nome' => 'Sala 3',
        'descricao' => 'Sala 3',
        'lotacao' => 30,
        'ativo' => 1,
        'created_at' => date('Y-m-d H:i:s', time()),
        'updated_at' => date('Y-m-d H:i:s', time()),
        'deleted_at' => NULL
      )
    );

    // Uncomment the below to run the seeder
    DB::table('salas')->insert($salas);
    // DB::unprepared ('EXEC sp_msforeachtable "ALTER TABLE ? WITH CHECK CHECK CONSTRAINT all"');
    DB::unprepared ('SET IDENTITY_INSERT tb_salas OFF');
  }

}