The book is a bit outdated by now. Lots of development have been done in DBI since.
Use perldoc DBI and skip to the section about bind_columns to read:
For compatibility with old scripts, the first parameter will be + ignored if it is "undef" or a hash reference.
In reply to Re: DBI bind_columns
by Tux
in thread DBI bind_columns
by fionbarr
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