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=head2 C<Class-E<gt>txn_active>

Returns true if a transaction is already active.

=head1 DIAGNOSTICS

=over 4

=item * C<Please specify a valid column for I<class>>

One of the class relationships you defined with C<has_a()> was missing a
C<column> member.

=item * C<Please define a valid method for I<column>>

One of the class relationships you defined with C<has_a()> was missing its
C<method> member and a method name could not be generated, or the class for
which you specified the relationship already has a method by that name. Perhaps
you specified an additional accessor by the same name for that class.

=item * C<keys don't match with primary keys: I<list>>

The hashref of values you passed as the ID to C<primary_key_to_terms()> was
missing or had extra members. Perhaps you used a full C<column_values()> hash
instead of only including that class's key fields.

=item * C<You tried to set inexistent column I<column name> to value I<data> on I<class name>>

The hashref you specified to C<set_values()> contained keys that are not
defined columns for that class of object. Perhaps you invoked it on the wrong
class, or did not fully filter members of the hash out before using it.

=item * C<Cannot find column 'I<column>' for class 'I<class>'>

The column you specified to C<column()> does not exist for that class, you
attempted to use an automatically generated accessor/mutator for a column that
doesn't exist, or attempted to use a column accessor as a class method instead
of an instance method. Perhaps you performed your call on the wrong class or
variable, or misspelled a method or column name.

=item * C<Must specify column>

You invoked the C<column_func()> method without specifying a column name.
Column names are required to create the accessor/mutator function, so it knows
what data member of the object to use.

=item * C<number (of partitions) is required>

You attempted to define partitioning for a class without specifying the number
of partitions for that class in the C<number> member. Perhaps your logic for
determining the number of partitions resulted in C<undef> or 0.

=item * C<get_driver is required>

You attempted to define partitioning for a class without specifying the
function to find the object driver for a partition ID as the C<get_driver>
member.

=back

=head1 BUGS AND LIMITATIONS

There are no known bugs in this module.

=head1 SEE ALSO

L<Data::ObjectDriver>, L<Data::ObjectDriver::Driver::DBI>,
L<Data::ObjectDriver::Driver::SimplePartition>

=head1 LICENSE

I<Data::ObjectDriver> is free software; you may redistribute it and/or modify
it under the same terms as Perl itself.

=head1 AUTHOR & COPYRIGHT

Except where otherwise noted, I<Data::ObjectDriver> is Copyright 2005-2006
Six Apart, cpan@sixapart.com. All rights reserved.

=cut