simple SQL92 ID generator

 DBIx::Sequence is intended to give easier portability to Perl database
 application by providing a database independent unique ID generator. This way,
 an application developer is not bound to use his database's SEQUENCE or
 auto_increment thus making his application portable on multiple database
 environnements.
 .
 This module implements a simple Spin Locker mechanism and is garanteed to
 return a unique value every time it is called, even with concurrent processes.
 It uses your database for its state storage with ANSI SQL92 compliant SQL. All
 SQL queries inside DBIx::Sequence are pre cached and very efficient especially
 under mod_perl.