After browsing through the DBIx::Class source code, it seems to me that DBIx::Class is less flexible that I hoped it to be... maybe it is not possible / very difficult to do what I originally intended.

Concretely, DBIx::Class::Storage::DBI handles insert/update statements, using

  sub _execute {
     ...
     my ($sql, @bind) = $self->sql_maker->$op($ident, @args);
     ...
     my $sth = $self->sth($sql,$op);
     ...
     $rv = $sth->execute(@bind)
     ...
  }
[download]

In particular, this means that because the bind parameters are passed to execute as array, no bind attributes can be specified! In this case, according to the documentation of DBI:

If any arguments are given, then execute will effectively call "bind_param" for each value before executing the statement. Values bound in this way are usually treated as SQL_VARCHAR types unless the driver can determine the correct type (which is rare), or unless bind_param (or bind_param_inout) has already been used to specify the type.

It would be possible to define the data type prior to executing the statement, because according to the documentation of DBI::bind_param(..., \%attr), the whole \%attr parameter is 'sticky' in the sense that a driver only needs to consider the \%attr parameter for the first call, for a given $sth and parameter.
However, even when using bind_param, this would still would still require changes to DBIx::Class in some form.

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