Laravelで文字セットを設定する方法

Schema::create('codes', function (Blueprint $table) {
{
    // ......
    $table->string('key')->unique()->charset('utf8')->collation('utf8_bin');
    // ......
});

Schema::create('codes', function (Blueprint $table) {
    $table->charset = 'utf8';
    $table->collation = 'utf8_bin';
    // ......
});

DB::statement("ALTER TABLE codes CONVERT TO CHARACTER SET utf8 COLLATE utf8_bin");