scala - change data type sequence String to String -

my dal :

  def login(username: string,pass :string) =           sql"""select ad1sys.pkg_stc_login.user_login ('#$username','#$pass')from dual""".as[string]        def getempname(username: string,empname :string) =           sql"""select ad1sys.pkg_stc_login.get_empl_name ('#$username','#$empname') dual""".as[(string)] 

my service :

def login(username:string,pass:string): future[seq[(string)]] = {     db.run(dallogin.login(username, pass))   }    def getempname(username:string,empname:string): future[seq[(string)]] = {     db.run(dallogin.getempname(username, empname))   } 

my controller :

def login = action.async(bodyparsers.parse.json) { request =>    val username = (request.body \ "username").as[string]    val pass = (request.body \ "pass").as[string]    servicelogin.login(username, pass).map { data =>     servicelogin.getempname(username,data).map(result =>       ok(json.tojson(result.map( p =>             modelkodecabang(p)         ))         ))}       } 

the result service.login seq(string) "data", can't use seq(string) parameter servicelogin.getempname(username,data).. how convert seq(string) string ??