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FROM clause (JPQL / Criteria API)

, NOT, NULL, NULLIF, OBJECT, OF, OR, ORDER, OUTER, POSITION, SELECT, SET, SIZE, SOME, SQRT, SUBSTRING
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Date and Time in JPQL and Criteria Queries

and time expressions that represent the current date and/or time: // Create current date
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Collections in JPQL and Criteria Queries

Collections may appear in JPQL queries: as parameters - when collections are assigned as arguments. as path expressions - in navigation to persistent collection fields. IS [NOT] EMPTY The IS [NOT] EMPTY operator checks whether a specified collection is empty or not. For example: c.languages
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Is ObjectDB better than competing object databases?

database by using an ORM JPA provider such as Hibernate, EclipseLink or Open JPA. Another advantage
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Step 2: Entity Class and Persistence Unit

the [Project Explorer] window) and selecting New > Folder (or New > Other... > General > Folder
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Spring MVC and JPA Tutorial

This tutorial demonstrates how to create and run a full Java Spring MVC (Model View Controller) web application using Tomcat (or GlassFish), JPA, ObjectDB and Maven. The demo web application manages a basic guestbook page. Every visitor can sign the guestbook by filling a simple form. All visitors
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Spring MVC JPA Tutorial - IntelliJ Project

the green run icon (or Shift+F10). If the browser fails to open check the settings at File > Settings > Web Browsers.
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Step 6: Set the Spring XML

right clicking and selecting Open With > Text Editor or by double click and then moving to the Source
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Step 6: Set the Spring XML

clicking and selecting Edit or by double click and then moving to the XML tab in the editor window
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javax.jdo.annotations.Join

foreign key constraint Default value: "" Since: JDO 2.1 String generateForeignKey Generate or assume a foreign key constraint exists on the column or columns associated with this join. Generate or assume a foreign key constraint exists on the column or columns associated with this join. Specify "true" or

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