How can i explicitly lock a row of a Table

Hi
How can we implement optimistic locking , i am using Oracle as Database for my Application .
Assume that i am working on a single row of a Table .
Now please tell me how can i explicitly lock this row , so that other simultanoues users insert or update operations are not affected to this particular row .
I am not using any ORM related technology
Please help .

raviprivate wrote:
Hi
How can we implement optimistic locking , i am using Oracle as Database for my Application .
Assume that i am working on a single row of a Table .
Now please tell me how can i explicitly lock this row , so that other simultanoues users insert or update operations are not affected to this particular row .Either you want optimistic locking which does not use (database) locks at all, or you want pessimistic locking which does use database locks.
In optimistic locking everyone is allowed to read and to update without taking out a lock. Usually the optimistic lock is realised by including either a 'version' or 'last_modified' column which with every update is either increased (version) or set to the current_timestamp (last_modified). The update statement must be issued with a condition including that column (eg UPDATE ... WHERE id=<id> AND version=<version at time of read>). If the column was already changed by another user or process zero rows will have been updated signalling to the program that another user already changed the row and the user must redo his changes, or a more complex method of change comparison can be done.

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