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  1. or download this
    use DBD::Oracle qw(:ora_types);
...
$sth->bind_param(1,$scode, ORA_NUMBER);
or
$sth->bind_param(1,$scode, ORA_VARCHAR2);
  2. or download this
    my $sql = 'SELECT ... FROM ... WHERE temperature = :temperature ...';
...
$sth1->bind_param( ':temperature', $degree_celsius, ORA_NUMBER );