import file from excel to mySql using laravel

I need to upload Excel values in database field.My Excel file has two values first value :list of pin numbers second value : list of cost

my database table hasid,pin_numbers and cost column . I need to store excel row values to database column pin_number and cost How can i do this? my current code is like this

 if(Input::hasFile('file'))
        {
            $f = Input::file('file');
            $att = new Attachment;
            $att->name = $f->getClientOriginalName();
           //how to save Excel pin_number and cost to mysql column pin_number and cost 
            $att->save();
            return Redirect::to('/upload_form');
        }

my db table is like this

CREATE TABLE `attachments` (
  `id` int(10) unsigned NOT NULL AUTO_INCREMENT,
`pin_number` varchar(255) DEFAULT NULL,
`cost` varchar(255) DEFAULT NULL,
  `name` varchar(255) NOT NULL,
  `created_at` datetime NOT NULL,
  `updated_at` datetime DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB;

                In PHP i used to do like this

<?php
include 'db.php';
if(isset($_POST["Import"])){
        

        echo $filename=$_FILES["file"]["tmp_name"];
        

         if($_FILES["file"]["size"] > 0)
         {

            $file = fopen($filename, "r");
             while (($emapData = fgetcsv($file, 10000, ",")) !== FALSE)
             {
        
              //It wiil insert a row to our subject table from our csv file`
               $sql = "INSERT into subject (`SUBJ_CODE`, `SUBJ_DESCRIPTION`, `UNIT`, `PRE_REQUISITE`,COURSE_ID, `AY`, `SEMESTER`) 
                    values('$emapData[1]','$emapData[2]','$emapData[3]','$emapData[4]','$emapData[5]','$emapData[6]','$emapData[7]')";
             //we are using mysql_query function. it returns a resource on true else False on error
              $result = mysql_query( $sql, $conn );
                if(! $result )
                {
                    echo "<script type=\"text/javascript\">
                            alert(\"Invalid File:Please Upload CSV File.\");
                            window.location = \"index.php\"
                        </script>";
                
                }

             }
             fclose($file);
             //throws a message if data successfully imported to mysql database from excel file
             echo "<script type=\"text/javascript\">
                        alert(\"CSV File has been successfully Imported.\");
                        window.location = \"index.php\"
                    </script>";
            
             

             //close of connection
            mysql_close($conn); 
                
            
            
         }
    }    
?>       

Please help me to make a modification in laravel5