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  1. or download this
    if(!$username){
 relogin("Enter your username");
}elsif(!$password){
 relogin("Enter your password");
}
  2. or download this
    if (!$username or !$password) {
    relogin('Username/Password pair not valid');
}
  3. or download this
    my $sth = $dbh->prepare("SELECT * FROM info WHERE pword='$password'");
$sth->execute() or die "Couldnt do it: $!\n"
  4. or download this
    my $sth = $dbh->prepare('SELECT * FROM info WHERE pword=?');
$sth->execute($password) or die "Couldnt do it: $!\n"