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Detached Entity Objects

). Retrieval by navigation from detached objects is not supported, so only persistent fields
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JPA Query Expressions (JPQL / Criteria)

Query expressions are the foundations on which JPQL and criteria queries are built. Every query consists of clauses - SELECT, FROM, WHERE, GROUP BY, HAVING and ORDER BY, and each clause consists of JPQL / Criteria query expressions. Atomic Expressions The atomic query expressions are: JPQL
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Step 6: Set the Spring XML

(whose name is derived from the name of the Spring dispatcher servlet in web.xml). To generate
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Step 3: Add a Context Listener Class

starts (contextInitialized). Retrieves the EntityManagerFactory from the application scope attribute
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Step 1: Create a Maven Web Project

all the required JAR files from Maven repositories - open the pom.xml file and in the pom.xml tab use
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Step 1: Create a Java Project

] window and select Add Jar/Folder... Select the objectdb.jar file from the bin subdirectory
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Step 6: Set the Spring XML

dispatcher servlet. Additional spring configuration is set in another XML file (whose name is derived from
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Step 1: Create a Maven Web Project

and to automatically download the required JAR files from Maven repositories - open the pom.xml file
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Step 1: Create a Java EE 6 Web Project

6 dynamic web project. To add ObjectDB/JPA support to the project, drag the objectdb.jar file from
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Java EE JPA Tutorial - Maven Project

is installed - extract the zip and run the application from the command line: > mvn package

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.

Need Help?

  1. Search ObjectDB website
  2. Read the FAQ
  3. Follow the Tutorials
  4. View or post in the forum
  5. Search or file an issue
  6. Contact support