Hierarchical database structures and Firebird PSQL

The idea of storing a hierarchical data in a relational database is very simple, but effective work with such a data requires some knowledge of server-side programming using procedural SQL (PSQL). So the hierarchical data structures are a good chance to get acquainted with PSQL. For demonstration purposes I created a simple database with single table TCLASS containing Delphi class hierarchy
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Future for Python driver merging the pure driver with the ctypes interface to Firebird.

Pavel Cisar wrote on firebird python list :
Those who attended my “Python drivers” session at conference in
Luxembourg already know that last two months I have worked on another
Python driver for Firebird (codename fdb). It was just an experiment how
far I could go in short time with another approach to implementation,
not real attempt to replace both existing drivers (KInterbasDB and
firebirdsql). However, it went so well, that we have a real chance to
get out a truly universal pure Python driver for Firebird next year.
Here are details…

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