laravel raw query change using string code example

Example: raw query in laravel with parameters

$someVariable = Input::get("some_variable");
$results = DB::select( DB::raw("SELECT * FROM some_table WHERE some_col = :somevariable"), array(
   'somevariable' => $someVariable,
 ));

DB::statement( 'ALTER TABLE HS_Request AUTO_INCREMENT=:incrementStart', array('incrementStart' => 9999) );