In my application I have a sub that read the user input and creates a hash ref that includes only the fields with a non empty value, then I build the insert.

my $record_ref = {
    bar => 'barbar',
};

# Check if ID field is present, add it, if not
#if ( ! exists $record_ref->{id} ) {
#    $record_ref->{id} = undef;
#}
# Not needed for mysql.

# Transform hash into two arrays
my @fields = keys %{$record_ref};
my @values = map { $record_ref->{$_} } @fields;

# code stolen from the IBPerl module examples ;)
my $sql = "INSERT INTO foo ("
               . join( ',', @fields ) . ')
              VALUES (' . ( '?,' x $#fields ) . "?)";

print "sql=", $sql, "\n";

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Update:
This is (also) a solution based on mysql's default mechanism, that is general enough to work with other rdbms's.

Update 2: Commented out the code regarding the ID column

In reply to Re: Using MySQL table's default values upon insert by stefbv
in thread Using MySQL table's default values upon insert by Zettai

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