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GROUP BY and HAVING clauses

OF c.continents GROUP BY c.currency Because grouping is performed in this query on a path
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Chapter 1 - Quick Tour

This 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
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Database Server

. For instance, you can increase the maximum JVM heap size and improve performance by using HotSpot JVM
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Step 4: Add a Servlet Class

(request, response); } } GuestServlet performs the following operations on every http request
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Step 3: Add a Context Listener Class

The 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
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Step 3: Define an EJB Session Bean

Operations 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
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Step 4: Add a Servlet Class

the list of guests: doGet(request, response); } } GuestServlet performs
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Step 4: Add a Servlet Class

performs the following operations on every http request: The EntityManagerFactory is retrieved from
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[ODB1] Chapter 3 - Persistent Classes

methods that perform the same accesses but also report to ObjectDB. Tracking changes in persistent
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[ODB1] Chapter 7 - JDOQL Queries

side may hold resources on the server side. The closing is performed using methods of the Query instance

Getting Started

ObjectDB is very easy to use. Follow the Getting Started Tutorial and the Quick Tour manual chapter and in minutes you may be able to write and run first Java programs against ObjectDB.

Prior knowledge or experience in database programming (SQL, JDBC, ORM, JPA, etc.) is not required, but some background in using the Java language is essential.

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