Commiting/Rollback changes in database.

Request you to help me understand the following scenario
Considering an example:
We have employees table. The table has a column "Salary"
And we have 4 employees in the database.
Now we want to do an activity wherein we want to deduct amount 10000(cumulative) in all from the 4 employees.
EMP1 - 2000
EMP2-3000
EMP3-4000
EMP4- 1000
Finally there needs to only one activity of - 10000 is to be made.
Four requests(emp1-emp4) is sent by web service to deduct the above mentioned amount. but i want the database must not commit the changes. A second request will be sent by web service to database to either commit or rollback depending.
So is this possible and if yes how shalli proceed. Please let me know if the example is un clear i will try mybest to make it comprehensible.

akm006 wrote:
Four requests(emp1-emp4) is sent by web service to deduct the above mentioned amount. but i want the database must not commit the changes. A second request will be sent by web service to database to either commit or rollback depending.Not possible.
Web-based client server architecture is stateless.
This means that there is no session state kept between client calls. Each and every client call is seen by the network and the database, as a NEW call.
So if you do not commit the database changes in the 1st web service call, those changes will be (should be) rolled back when that web sevice's database session terminates. The 2nd web service call will be a new/different database session - and it cannot commit changes made by, and in, another session.
For this reason, pessimistic locking (database default) is not recommended for web-based client server. Optimistic locking (in the application layer) needs to be used instead.
I suggest that you take a close look at what stateless architecture means and how it works - and how optimistic locking needs to be used instead of standard database's pessimistic locking.

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Hi All,
I hv a situation where a webservice interacts with the database.
Here the webservice will first make a request to database for some operation but i dont want the database to commit changes in first request itself. A response will be sent to webservice further a second request will be sent to database for committing the changes. So can that be done?
thanks for ur advise in advance.

Hi,
I hv a situation where a webservice interacts with the database.Here the webservice will first make a request to database for some operation but i dont want the database to commit changes in first request itself. A response will be sent to webservice further a second request will be sent to database for committing the changes. So can that be done?
>
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every time i can see only one table i.e. properties are set for the first table ........and each time the properties are being set for the first table only.....i dont no what is happening to the rest of the tables..
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Copyright (c) 1982, 2004, Oracle. All rights reserved.
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After Change DB Name Take Whole Database bkp.
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http://download-uk.oracle.com/docs/cd/B19306_01/server.102/b14215/dbnewid.htm
thanx
Message was edited by:
user526020
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