[Zope] Where to find ducument of ZODB

[iap_y2fun.com]

Is there anyone can tell me how to "alter table" in Zope? and where to find a tutorial or manual of ZODB. I am new to POS , Is there any stuff that will give me a senerio of working with POS, such as ZODB.   Thanks a lot.   Iap, Singaun