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JPA Persistable Types

and retrieval are faster). It simplifies queries on dates and ranges of dates. When an entity is stored

Is ObjectDB scalable? What are its limitations?

ObjectDB is highly scalable and can manage efficiently databases in a wide range of sizes, from a few Kilobytes to hundreds of Gigabytes and even Terabytes. ObjectDB can be used in small embedded single user applications as well as in heavy loaded multi threaded multi user applications. ObjectDB

JPA Queries

three groups. SELECT and ORDER BY elements (including tuples): FROM clause elements (representing range

WHERE clause (JPQL / Criteria API)

over all the Country objects in the database using the c range variable. Before passing these Country

Criteria Query From Elements

The interfaces in this group are in use for setting a criteria query FROM clause. Criteria Query Variables The FROM clause in JPA queries (as in SQL) defines the query variables. Query variables are represented in criteria queries by descendant interfaces of the From interface: Range variables

ObjectDB Overview

. Suitable for database files ranging from kilobytes to terabytes. Supports both Client-Server mode

Database Explorer

of elements. Use the [First] and [Max] fields to set the result range. Check [Disable Cache] to bypass

Step 4: Create an ObjectDB Data Set

a specified range: SELECT p.x as x, p.y as y FROM Point p WHERE p.x BETWEEN :low AND :high Use copy

[ODB1] Chapter 7 - JDOQL Queries

(Object p1, Object p2, Object p3) For example, all the people in a range of ages can be retrieved

[ODB1] Chapter 1 - About ObjectDB

ObjectDB for Java/JDO is a powerful Object Database Management System (ODBMS) written entirely in Java. It can efficiently handle a wide range of database sizes, from a few KBs to hundreds of GBs. It has a small footprint, high performance, and a flexible architecture (1-Tier, 2-Tier or N-Tier). 1

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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