How put Session with different database in laravel?

I've two database which is 1 for system two for data and I've a select option and I want to get the session selected using Session::put() laravel but Iam getting error,

this the code

$tahun= Session::put('tahun', DB::connection('pgsql2')->table('laporan')->get('tahun'));
$bulan=Session::put('bulan', DB::connection('pgsql2')->table('laporan')->get('bulan'));;    
$tahun2=Session::put('tahun2', DB::connection('pgsql2')->table('laporan')->get('tahun2'));;
$bulan2=Session::put('bulan2', DB::connection('pgsql2')->table('laporan')->get('bulan2'));;
$audit1 = Session::put('audit1', DB::connection('pgsql2')->table('laporan')->get('audit1'));;
$audit2 =Session::put('audit2', DB::connection('pgsql2')->table('laporan')->get('audit2'));;

I've read that people use Session with 2 param but still I'am getting error. how do I fix this ?

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