Antonio Beamud Montero wrote:

Hi all: How I can make a variable from a Product persistent, but only exists a copy in the ZODB?, i.e. this variable is updated every 30 sec. and I don't want ZODB saves all old states of this variable, only the last... How I can make this...?

Thanks in advance

You do not specify whether it is a file-system Product or ZODB Product. My preference would be to go simpler, rather than installing a non-replicating storage for something small like this. That is, however, an option (search for non-replicating storage). If it is a filesystem product, you have the option of writing the data to a file. I would look at the FSCounter Product for an example of how this would be done. If it is a ZODB product, use gadfly (you already have this!) or another SQL database if you are using one. Create a database and table and Z[your Db] Adapter, if necessary, then 'get' and 'set' ZSQL Methods. If it is a complicated variable, like a class instance, you might want to investigate the python "pickle" function. This normally will only be available to a filesystem product or External Method. You have many options. -- Jim Washington