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Most Perl developers know DBI as a convenient module that provides a standard interface to various relational databases.
Many extensions to DBI exist: this talk examines DBIx::Class and its related modules. Developers considering using more than plain DBI might find this talk interesting.
DBIx::Class translates database records to Perl objects, dealing not only with simple mappings between the two, but also complex relationships that help developers work with legacy databases and optimise their code's performance.