I am trying to create a session for my web application using Dancer2. I currently using mysql database. I searched alot of reference on the internet because I'm new to Perl it seem the references are too complicated. Please guide me. Here is my .pm code.

post '/' => sub {
my $username = $q->param("username");
my $password = $q->param("password");
        my $loginstatement = 'SELECT * FROM account WHERE username=? a
+nd password=?';
        my $sth = $dbh->prepare($loginstatement) or die $dbh->errstr;
        $sth->execute(params->{'username'}, params->{'password'}) or d
+ie $sth->errstr;
        my (@userID) = $sth->fetchrow_array;
        if ($userID[0] != 0 && $userID[11] ==1 ){
        
                my $sessionstatement = "SELECT * FROM sessions";
                my $sth2 = $dbh->prepare($sessionstatement) or die $db
+h ->errstr;
                my (@sessID)= $sth2->fetchrow_array;
                if($userID[3] == $sessID[1]) {
                session 'logged_in' => true;
                }
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