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If you run the page, you ll notice that the Label control updates every four seconds with the new time without doing a full page refresh (see Figure 5-13).

else { System.out.println( "You have successfully updated the " + "employee information." ); } } finally { JDBCUtil.close( cstmt ); } } }// end of program To run the program, I opened two windows (you need to use command-line windows in Windows and an xterm or its equivalent in UNIX). I then executed the following command in window 1: B:\>java DemoOptLockingBySavingOldValues URL:jdbc:oracle:thin:@(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp) (PORT=1521)(HOST=rmenon-lap))(CONNECT_DATA=(SID=ora10g))) empno: 7654, name: MARTIN, salary: 1350, checksum: 12858 Row has been selected but is not locked. Press Enter to continue... With the pause still on in window 1, I executed the same command in window 2: B:\>java DemoOptLockingBySavingOldValues URL:jdbc:oracle:thin:@(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp) (PORT=1521)(HOST=rmenon-lap))(CONNECT_DATA=(SID=ora10g))) empno: 7654, name: MARTIN, salary: 1350, checksum: 12858 Row has been selected but is not locked. Press Enter to continue... I then pressed Enter in window 1. The update went through successfully, and I got the following message: You have successfully updated the employee information. When I pressed Enter in window 2, though, the update would not work since the same row was changed by the process in window 1 during its pause time. Hence I got the following message: Sorry. Someone else changed the data that you were trying to update. Please retry. This shows that the optimistic locking technique has successfully prevented a lost update.

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An alternative way for you to detect conflicting changes made by another transaction is to maintain a shadow column, such as a modification timestamp, or a column populated by a sequence in the table, or a GUID column. A GUID is a 16-byte RAW globally unique identifier.

Summary

After every successful update, you update the shadow column to a new unique value (eg, a timestamp to the latest timestamp, a sequence to the next sequence value, a GUID column populated by the SYS_GUID() method to a new GUID, etc) The update statement itself will have a where clause where you compare the shadow column value to the old value that existed when you selected the record to display it to the user The pseudo code (assuming that the shadow column, shadow_col, is populated by a sequence) would look something like the following: update table_name set col1 = :new_col1_value, col2 = :new_col2_value shadow_col = sequencenextval where shadow_col = :old_shadow_col_value and primary_key_col1 = :primary_key_col1 and primary_key_col2 = :primary_key_col2; if( update above updated 0 rows) then update failed because someone else changed the underlying values - ask the user to retry.

else update succeeded end if; Let s look at an example We create a copy of the emp table, called emp1, to hold the sample data for our example We also have a column that we initialize with the value of a sequence We first create the table emp1 with no data its structure is that of the emp table except that it has an additional numeric shadow column called row_change_indicator (notice that the table will be created empty since the where clause, where 1 != 1, will always fail): scott@ORA10G> create table emp1 as 2 select e*, 1 as row_change_indicator 3 from emp e where 1 != 1; Table created Next, we create a sequence, seq1: scott@ORA10G> create sequence seq1 cache 100; Sequence created.

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