Robert Hendley wrote: > I am a php developer mainly. And am in the learning curve for > JSP/Servlet development. I am sold on Stuts, I have read 20+ articles on > Struts and have found them helpful. My problem is information overload. > I am trying to port a php application to Struts that manages inventory > and invoicing. I am wondering if any one has written an application like > that using Struts. Or if one could give me some direction on where to > start. I have deployed several webapps with success and used a cookbook > approach to modify and tweak etc.. So if you have a moment I have a few > questions. > > > 1. How did you handle record locking ? As an example editing a customer > record and not allowing two to edit at the same time. > I am thinking a hash but where to put it?
Most of us do optimistic, or like a timestamp column. > > 2. I want to have a cache at the application scope of the "open" > invoices > , approx (100-200) about 1k each. The application currently uses 27 > tables, so any invoice can require up to 12 queries(I did not design the > schema)I have no real idea where to start with this. If it does not decay, you can make it application scope singleton R/O. A lot of clients buy the O/R and then they do not design the model relational, or have it done by somone who read a book on relational design, 6 months of experience (degree in MIS, they must teach that? :-), HUge difference in SQL written by 3 years of SQL experience, vs 6 years, 9, etc. I have been on clients that have 8 way joins and more, and they would say things like we read that the model is not important. Other readers note that this is more of a realistic problem, not desgin patters of VO/DTO) Alternative, Poolman (sourceforge) can cache the results of a query. Commons pool can cache your own objects. I use CachedRowSet, where you can store your massaged resulsts. Maybe your best bet. Maybe... have a cache/optimization "memory" db of my own design, (ASA, pgSQL) that I would use that matches use design. That db would then run a cron job and use procs in pgSQL or transactSQL to sync up to old db. You are not going to have a standard Struts project, but something with a complex model. > > 3.What if any advice could you give for a navigation system that has > properties that are only available to a user/group? I use StrutsMenu on sourceforge for navigation. It has some new features to let you turn on / of menu items. You could do getUserPricincapal() and based on it do a select of groups they are in. Store the group in session. Then turn/on /of menu items. hth,.V > > Thanks > Robert Hendley > [EMAIL PROTECTED] -- To unsubscribe, e-mail: <mailto:[EMAIL PROTECTED]> For additional commands, e-mail: <mailto:[EMAIL PROTECTED]>
