Zeoslib Portal

Thanks for the answer. Considering the fact that both of the methods "open" and "refresh" load all data so, what is the real difference between using tzquery.open and tzquery.refresh?

How to load only changed data into the resultset instead of loading all table in database? Every refresh i use sends a new query to the database loading always the whole table. It is very slow. Are there any way to retrieve only the changed data?