January 2018
Intermediate to advanced
350 pages
9h 7m
English
Content preview from Java EE 8 High Performance
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From JPA to the database
JPA let's you represent your database in plain Java. Said otherwise it let's you represent the relational model as an object model. It is very common for the development and maintenance but at some point, and in particular when you will validate your performances, you will need to check what the mapper (JPA implementation) is doing and how it does translate your object code/model to the relational one (SQL).
When you check the JPA caller code, you often have something like the following:
final Quote quote = entityManager.find(Quote.class, id);....entityManager.persist(quote);
For more complex queries, it is like the following:
final Number count = entityManager.createQuery("select count(q) from Quote q", Number.
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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.
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