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The third problem with this technique is that the second user has to wait until the transaction of the first user has been committed, only to get an error message asking him to retry This can be very annoying Thus, setting the transaction isolation level can be considered a solution to the lost update problem if You are working in a stateful environment (eg, in a client/server application) where a connection is maintained across multiple user requests There is already a need to use the serializable transaction due to other business requirements The number of expected simultaneous updates involving the same row(s) is fairly low This would ensure that we don't waste the end user's time by giving error messages after making him wait for a long time If the preceding criteria are not met, you need to consider the other approaches described in the next sections..

If you now view the browser output, you ll notice a new <div> tag along with extra JavaScript that has been emitted by the UpdateProgress control:

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This locking technique makes the pessimistic assumption that more often than not, the end user will run into a scenario that will result in a lost update. To prevent this from happening, the record being updated is locked, right after the user signals her intent to update it, by issuing a select...for update nowait form of query. The for update nowait clause signals the intent to lock the record being updated. The optional nowait keyword indicates that if the record is already locked by someone else, control should return immediately to the user with an error instead of waiting until the other transaction commits. Typically, the application requirement is to not wait, but to give the control back to the user immediately so that she can perform some other function before returning to try and lock the record again to complete her original transaction. If this is not the case, you can skip the nowait keyword. Note that you can also wait for n seconds before failing by giving the for update wait <n> clause. Let s revisit the example where we were updating the salary of the salesperson Martin in two conflicting sessions. The application first queries all salespeople and displays them on a screen without locking them: blake@ORA10G> select empno, ename, sal from emp where job='SALESMAN'; EMPNO ---------7499 7521 7654 7844 ENAME SAL ---------- ---------ALLEN 1600 WARD 1250 MARTIN 1350 TURNER 1500

The user navigates to the record containing Martin s data and indicates his intention to update it (say, by clicking an icon in the GUI). At this time, we try to lock the record by issuing a select statement that has A for update nowait clause to lock the row so that no one else is able to update the row before we have committed our changes. If the lock cannot be acquired, we want the program to return immediately hence the nowait clause. A where clause criteria to match a row based on the primary key column(s) (in this case, the empno column). This is to ensure we lock only the one record that we want to update. A where clause criteria to match a row based on current values of all the columns that can be modified on the screen. In our hypothetical screen, we can potentially modify the ename and sal columns (remember, empno is being displayed but cannot be modified since it is a primary key and hence immutable).

In our example, this would result in the following select being issued to lock Martin s record: blake@ORA10G> select empno, ename, sal from emp where empno=7654 and ename='MARTIN' and sal=1350 for update nowait; EMPNO ENAME SAL ---------- ---------- ---------7654 MARTIN 1350 The following three scenarios are possible at the point Blake tries to lock the row as shown earlier: If Blake s session was able to lock the record, then Blake can proceed to update it safely without worrying about it being overwritten by some other transaction If some other session was able to lock the record before Blake, Blake would get a resource busy exception as a result of the previous select indicating that the record is locked, and he needs to try his luck later.

The new scripts that have been injected into the page dynamically toggle the style property of the div without you having to do any additional coding.

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