8 | GROUP BY and HAVING clauses OF c.continents GROUP BY c.currency Because grouping is performed in this query on a path |
8 | 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 |
8 | Database Server. For instance, you can increase the maximum JVM heap size and improve performance by using HotSpot JVM |
1 | Step 4: Add a Servlet Class(request, response); } } GuestServlet performs the following operations on every http request |
1 | Step 3: Add a Context Listener ClassThe Guest entity objects will be stored in an ObjectDB database, which will be represented by a JPA's EntityManagerFactory instance with a global application scope. We have to register a ServletContextListener to perform initialization and cleanup operations: The database will be opened (or created |
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 Java Class] dialog box by right clicking the guest package node (in the [Package Explorer] window) and selecting New > Class. The package name should be guest |
1 | Step 4: Add a Servlet Class the list of guests: doGet(request, response); } } GuestServlet performs |
1 | Step 4: Add a Servlet Class performs the following operations on every http request: The EntityManagerFactory is retrieved from |
0 | [ODB1] Chapter 3 - Persistent Classes methods that perform the same accesses but also report to ObjectDB. Tracking changes in persistent |
0 | [ODB1] Chapter 7 - JDOQL Queries side may hold resources on the server side. The closing is performed using methods of the Query instance |
