TopLink is indeed a mature product. Tomm commented that it's free; it's freely downloadable for development use, but I don't think you can freely use it in a production environment. It's part of Oracle's application server and you've got to pay for that.
I've been playing around quite a bit with Java Data Objects lately, which is the Java standard persistence API. It's not a specification for object-relational mapping per se in that it only specifies the Java side, but as a practical matter any implementation for a relational database implies object-relational mapping. It's not as mature or as powerful as TopLink, but I think it's much easier to use and provides persistence much more transparently. - David Gallardo At 11:42 AM 9/23/2002 -0400, you wrote: >TopLink works great. Its been around for years. i.e. bugs have been >worked out , production code !! >The only thing to be said against it, is that in some N.I.H. orgs. it >doesn't put the level of control directly into the developers hands. >Personally I find it liberating to work on the business problems and >not waste everyone's time with OO to Relation mappings. > > >Tomm Carr wrote: > > > > Joseph Ottinger wrote: > > > > > For some reason, your question gives me the screaming meemies. The > > > concept is correct - you'd use bean-managed persistence to access and > > > manipulate (and persist) the data, and the latest EJB specs certainly > > > support crossing individual entities... but the idea of adding high > > > volume to "thousands of xml files" with "complex" in their > > > description... I'm not sure you're going to GET high volume, no matter > > > what you do. > > > > I agree. XML makes a very good low-end, transaction-free database. But > > this seems to be have passed "low-end" quite a while ago. A good DBMS > > is cheap, even Oracle. He seems to be pushing a technology way beyond > > its abilities, therefore way beyond its usefulness. The word that came > > to my mind when reading his description was "fragile." Which means > > trouble, lots of it, and soon. > > > > For those who need high-powered persistence, but don't want to (or > > can't) handle the conversion from object to relational, go to the Oracle > > site and look for TopLink. It is free and looks very impressive. (I am > > only just now examining it, but so far I like what I see.) > > > > Tomm > > > > To change your JDJList options, please visit: > http://www.sys-con.com/java/list.cfm > > >To change your JDJList options, please visit: >http://www.sys-con.com/java/list.cfm To change your JDJList options, please visit: http://www.sys-con.com/java/list.cfm
