August 2001
Intermediate to advanced
400 pages
9h 28m
English
Content preview from Java Programming with Oracle SQLJ
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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.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.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.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.
10.2. Batch Processing
The technique of combining many small operations together into one large batch has a proud heritage in computing, and dates all the way back to the time when jobs were submitted to computers in the form of punched cards. You will be pleased to know that SQLJ has similar facilities for batching database operations.
You can get SQLJ to buffer identical SQL INSERT, UPDATE, or DELETE statements in your SQLJ programs into a batch, which is then submitted to the database. This reduces the number of round trips made to the database over the network, and may lead to an improvement in performance.
|
One candidate for batching is a SQL statement contained within a loop. Another is a method that is run repeatedly and contains a SQL statement. In this section, I explain how to control and run batches in your SQLJ programs.
10.2.1. Controlling Batching
Batching is a feature you control through an execution context. (Execution contexts were discussed in Chapter 8.) By default, batching is not enabled. To enable batching for an execution context, call the method setBatching( ). This method accepts a Boolean true or false value indicating whether or not batching should be enabled. The following statements first create an execution context named my_exec_context, and then ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
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.