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my $cmd = "INSERT INTO $table ($fields) VALUES ($placeholderList)";

#  Accepts a database handle, a table name, and a hashref
#  of field names and values. Returns on success, otherwise
...
sub addData
{
  my ( $dbh, $table, $args ) = @_;

  #  Get a comma separated list of the field names ..
  my $fields = join(',', keys %$args);
...
  #  Get a comma separated list of '?', one for each value
  #  ..
  my $placeholderList = join(',',('?') x @values);

  #  Prepare the command and execute it with the array of
  #  values.
...
  $sth->execute(@values) or die $sth->error;

  return 0;     # Success!

#  Accepts a database handle, a table name, and a hashref
#  of field names and values. Returns on success, otherwise
...

  return 0;     # Success!
}