10 | Setting and Tuning of JPA Queries); Flushing changes to the database before every query execution affects performance significantly. Therefore, when performance is important, this issue has to be considered. Lock Mode (setLockMode) ObjectDB |
7 | GROUP BY and HAVING clauses OF c.continents GROUP BY c.currency Because grouping is performed in this query on a path |
7 | FROM clause (JPQL / Criteria API) could also cause performance problems. For example, let's look at the following query execution |
7 | Storing JPA Entity Objects. Storing a large amount of entity objects can also be performed by multiple transactions: em |
7 | Obtaining a JPA Database Connection, update, and delete should only be performed within an active transaction. Given an EntityManager, em |
7 | Database Server. For instance, you can increase the maximum JVM heap size and improve performance by using HotSpot JVM |
7 | Chapter 1 - Quick TourThis chapter demonstrates basic ObjectDB and JPA concepts by introducing a simple example program. After reading this chapter you should be able to write basic programs that create, open and close ObjectDB databases and perform basic CRUD operations (Create/Store, Retrieve, Update and Delete |
1 | Step 4: Add a Servlet Class(request, response); } } GuestServlet performs the following operations on every http request |
1 | Step 3: Define an EJB Session BeanOperations on the database will be performed by an instance of a session bean (EJB) class that we will define in this step: Open the [New Session Bean] dialog box by right clicking the guest package node (in the [Projects] window), selecting New > Other... > Java EE (or Enterprise JavaBeans |
1 | Step 4: Add a Servlet Class performs the following operations on every http request: The EntityManagerFactory is retrieved from |
