how to print model query in laravel

i am new in laravel and have to save the record in table , i am using this code to insert the value

$model->studentRollId = $value1;
$model->resident_permit_number = $value2;
$model->save()

i am not getting any error but record not inserting in the table , so can anyone please tell me how can i print the executed query by the $model->save(), i tried DB::getQueryLog() but its not shiwing the query log so i can fin what is the issue . thanks in advance

via Chebli Mohamed