>> Thanks for this, what good persistence layers are there? Is there something that works with struts and is simple?
Dean, There are various types of persistence layers. For a nice description of persistence patterns, see Martin Fowler's web site at: http://martinfowler.com/isa/OR-mapping.html. I've been using a relatively new entry to the open source domain called Jaxor. It's based on Fowler's patterns and specifically implements the RowDataGateway pattern. It generates Finder and Entity classes for tables in your DB, based on mappings defined in an XML document. I was up and running in 20 minutes. See it at http://jaxor.sourceforge.net. -Jeff -----Original Message----- From: Chen, Dean (Zhun) [mailto:[EMAIL PROTECTED]] Sent: Thursday, October 03, 2002 3:25 PM To: 'Struts Users Mailing List' Subject: RE: Should I use a persistence layer? Thanks for this, what good persistence layers are there? Is there something that works with struts and is simple? Dean Chen -----Original Message----- From: Joe Barefoot [mailto:[EMAIL PROTECTED]] Sent: Thursday, October 03, 2002 2:41 PM To: Struts Users Mailing List Subject: RE: Should I use a persistence layer? Yes. The standard approach is to only keep in memory results that are currently on the page. Have a persistence layer (either EJB or O/R mapping tool, or a combination of the two) "page" the results for you. i.e., you give it search criteria, sort criteria, a begin index, and an end index, and it gives you back the results. This solves two problems: The one you are encountering with bad results with two different windows, and the memory problems associated with very large result sets. There are examples of this sort of implementation out there; sorry I can't provide links. :( peace, Joe > -----Original Message----- > From: Chen, Dean (Zhun) [mailto:[EMAIL PROTECTED]] > Sent: Thursday, October 03, 2002 10:13 AM > To: 'Struts Users Mailing List' > Subject: Should I use a persistence layer? > > > Hi, > > For an web application, is there a way for a user to paginate through > (similar to google) a lot of data across multiple browser windows. > > The usual way of paginating with session scope works fine. > However, if a > user has 2 windows open on the same application. When he/she > queries on one, > then queries on another, and then comes back to the first > window and click > "Next", he/she will get bad results. > > Does this lead to EJB or any other persistence layers? > > Thanks, > > > Dean Chen > > > -- > To unsubscribe, e-mail: > <mailto:[EMAIL PROTECTED]> > For additional commands, e-mail: > <mailto:[EMAIL PROTECTED]> > > -- To unsubscribe, e-mail: <mailto:[EMAIL PROTECTED]> For additional commands, e-mail: <mailto:[EMAIL PROTECTED]> -- To unsubscribe, e-mail: <mailto:[EMAIL PROTECTED]> For additional commands, e-mail: <mailto:[EMAIL PROTECTED]> -- To unsubscribe, e-mail: <mailto:[EMAIL PROTECTED]> For additional commands, e-mail: <mailto:[EMAIL PROTECTED]>
