Hi there, There is a bug into "lib/python/TreeDisplay/TreeTag.py" that prevents the SQL example that can be found here : http://www.zope.org/Members/anthony/tree-coding-tricks from running with MySQL. The error that is returned by Zope is : -- Error Type: TypeError Error Value: call of non-function (type long int) -- It's because MySQLDA returns a longint type for int columns of a MySQL table. I have made a little patch that corrects the problem. It's available here : http://www.virtual-net.fr/zope/TreeTag-patch.py.gz Since I am very surprised nobody found this bug before, I think it may comes from the version of one og the component I am using. For information, these are the versions of all the softwares I use : Zope: 2.2.5 MySQL: 3.22.32 Distutils: 1.0.1 MySQL-python: 0.3.3 ZMySQLDA: 2.0.4 -- S. Namèche (snameche@virtual-net.fr) Société Virtual Net Immeuble Gallium Tél. +33 2 2321 0630 80, avenue des Buttes de Coësmes Fax. +33 2 9938 1685 35700 Rennes - France Mob. +33 6 1670 2998 -- "It's easy to stop making mistakes, just stop having ideas." -- Someone in the Zope mailing list