Is it possible to have a ZClass that has some attributes in sync with a database table ? Each instance should be a record in the database table. Example: you have a FooClass with the a1 string , a2 and a3 integer attributes. In the same time you have a database table: create table foo ( a1 varchar(255), a2 integer, a3 integer ); When you add a FooClass instance a row should be added to the database and when you edit it the row should be updated. Ditto for deletion. -Petru