If you want to SQL SELECT a row from a database, and then later UPDATE the same row, you have 2 choices as a Java developer.
SELECT with ROWLOCK, or whatever the
row lock syntax is for your
particular data base.
SELECT the row, do your processing,
and just before you're ready to
update, SELECT the row again with ROWLOCK to see
if any other thread made changes.
If the two SELECTS return the same
values, UPDATE. If not, throw an
error or do your processing again.
