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Schema Update

ObjectDB tries to apply the specified schema updates every time a database is opened. When using client

Numbers in JPQL and Criteria Queries

) is evaluated to 2 (3 goes into 11 three times with a remainder of 2) MOD(8, 4) is evaluated to 0 (4 goes into

ObjectDB License

, and programs mentioned in this site at any time, at its sole discretion.

WHERE clause (JPQL / Criteria API)

with millions of objects in the database there is a huge difference in query execution time if proper

Obtaining a JPA Database Connection

instance while at the same time sharing a single application-wide EntityManagerFactory

Database Schema Evolution

entity class. This is done automatically in memory each time the entity object is loaded. The database

Database Connection using JPA

, but it is a one time operation. Once constructed, it can serve the entire application. Operations that modify

JPA Lifecycle Events

that should be applied by default to all the entity classes. Currently, default listeners

Step 4: Run the Application

) When you run the application for the first time, a new ObjectDB database file is generated in

[ODB1] Chapter 1 - About ObjectDB

a very short time, because it is very easy to use. In fact, it is the easiest JDO implementation

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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