March 2007
Intermediate to advanced
712 pages
21h 53m
English
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Chapter 10. Using the query API and JPQL to retrieve entities
This chapter covers
- Creating and executing queries
- The Java Persistence Query Language
- Using SQL queries
Chapters 8 and 9 discussed how the EJB 3 Java Persistence API (JPA) O/R mapping mechanism shields developers from having to write SQL to directly manipulate data. Chapter 8 explained how to map entities to relational tables, and chapter 9 revealed how to manipulate those entities using the EntityManager API. The next couple of topics we’ll tackle in our quest for JPA mastery are the query API and the Java Persistence Query Language (JPQL). We’ll continue to use ActionBazaar to explore these new concepts, incorporating JPQL into our auction system as well as looking at how the ...
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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.