But this requires adding a column to every table. I found two ways of doing this. 1. Using time stamp. It requires adding a column to table. 2. Checking data for equality before updating. It requires querying database again. Any alternative way.
thanks for the replies Antony Paul ----- Original Message ----- From: "Jean-Louis" <[EMAIL PROTECTED]> To: "Tomcat Users List" <[EMAIL PROTECTED]> Sent: Monday, November 03, 2003 3:13 PM Subject: Re: Design advice needed. > Hi, > > you can use a timestamp and write for example : > update ... > where ... > and timestamp = 'the timestamp read by the select statement and saved in your application' > > And then check the number of rows updated. > > Antony Paul a écrit : > > > Can u pls mention what is that Oracle feature ?. Reading the data again is > > time consuming. > > ----- Original Message ----- > > From: "Johan Kok" <[EMAIL PROTECTED]> > > To: "'Tomcat Users List'" <[EMAIL PROTECTED]> > > Sent: Monday, November 03, 2003 12:17 PM > > Subject: RE: Design advice needed. > > > > > Anthony, > > > > > > Did you consider reading the record without locks, and when an updated are > > > made, to take a write-lock, check that the original record are still the > > > same and then apply, otherwise fail. > > > > > > Your intentions might not work unless all writes are passed through the > > > container, as Oracle will not have any control, until a write occurs, i.e. > > > you will have to open with read only, and only take out a lock when you > > are > > > going to write, as described above. for safety sake your container will > > have > > > to re-read the data in any case, before commiting, otherwise it may update > > > changed data, e.g. updates that are made through other processes or even > > > triggers. > > > > > > If my memory serves me right, that is something you can do easily with > > > Oracle (i.e. there's a standard feature implemented), even with Oracle > > 6/7. > > Jean-Louis CLAUSS > > > --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
