how to Multi clients should notify the updates for data ?

[chandu]

hello,

in a multi client environment .
at the same time two clients open the Application.
one client updated some data in the database.
at that time another client wants to update some data.. the other client
must notify that in the data base data was updated by first client..

how to do it?

thanks

[Michael Nemtsev]

It depends on your DB, because some databases have mechanism to notify other
about changes (via internal services or via triggers).
Besides it could be set via levels of transaction isolations
(http://en.wikipedia.org/wiki/Transac...solation_level)

If these cases unacceptable, you need realize notifier behavior (observer
pattern) in you own data layer which will be used my multiple clients

--
WBR,
Michael Nemtsev :: blog: http://spaces.msn.com/laflour

"At times one remains faithful to a cause only because its opponents do not
cease to be insipid." (c) Friedrich Nietzsche


"chandu" wrote:

hello,

in a multi client environment .
at the same time two clients open the Application.
one client updated some data in the database.
at that time another client wants to update some data.. the other client
must notify that in the data base data was updated by first client..

how to do it?

thanks