November 2005
Intermediate to advanced
896 pages
31h 5m
English
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Transactions
A transaction is a group of several
operations that must behave atomically (i.e., as if they are a single,
indivisible operation). With regard to databases,
transactions allow you to combine one or more database actions into
a single atomic unit. If you have an application that needs to execute
multiple SQL statements to fulfill one goal (say an inventory
management system that needs to move items from an INVENTORY table to a SHIPPING table), you probably want to use
JDBC’s transaction services to accomplish the goal.
This section gives a brief overview of transactions with respect to relational databases and JDBC. For broader coverage of transactions in the general J2EE environment, see Chapter 16.
Working with a transaction involves the following steps: start
the transaction, perform its component operations, and then either
commit the transaction if all the component operations succeed or roll
it back if one of the operations fails. The ability to roll back a
transaction is the key feature. This means that if any one SQL
statement fails, the entire operation fails, and it is as though none
of the component operations took place. Therefore, it is impossible to
end up with a situation in which, for example, the INVENTORY table has been debited, but the
SHIPPING table has not been
credited.
Another issue with transactions and databases concerns changes to the database becoming visible to the rest of the system. Transactions can operate at varying levels ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.