Hi,

I'm starting to develop a zope products and I'm still confused on how to use ZODB.

My current application development is using RDBMS concept such as following samples:

employee table:

Row   First Name     Last Name Age
===   ==========   ========= ===
1     Bob                  McBob         42
2     John                Johnson        24
3     Steve             Smith             38

- I can easily perform SQL statement to lookup for some information such as, total employee, who are above 30 years old, and who has the Lastname of 'Smith'.

- I can easily retrieve information from multiple tables and combine it as data objects.

But how can I do this in ZODB?

I was looking at http://www.zope.org/Documentation/Books/ZDG/current/index_html

but it just tell me briefly how to store objects and simple retrieval.

I need to do complex queries or perform some transaction.

Can anyone help me the way to query data in ZODB?

thanks,
Heri