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About ObjectDB Database

. Advanced querying and indexing capabilities. Effective in heavy loaded multi-user environments. Can easily
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Activation completed successfully!

only signed enhanced persistable classes - activation by end users is unnecessary.
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BIRT/ODA ObjectDB Driver

- either embedded (e.g. c:\points.odb) or client-server (e.g. objectdb://localhost/points.odb;user=admin
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Chapter 2 - JPA Entity Classes

JPA Entity classes are user defined classes whose instances can be stored in a database. To store data in an ObjectDB database using JPA you have to define entity classes that represent your application data object model. This chapter explains how to define and use entity classes. 
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Chapter 4 - JPA Queries (JPQL / Criteria)

The JPA Query Language (JPQL) can be considered as an object oriented version of SQL. Users familiar with SQL should find JPQL very easy to learn and use. This chapter explains how to use JPQL as well as how to use the JPA Criteria API, which provides an alternative way for building queries in JPA
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Comparison in JPQL and Criteria API

(=, <>, ==, !=). Instances of user defined classes (entity classes and embeddable classes
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Database Management Settings

. Therefore, when ObjectDB runtime is bundled in a product that uses only signed enhanced persistable classes - activation by end users is unnecessary.
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DELETE Queries in JPA/JPQL

queries can only be executed within an active transaction and the changes are visible to other users
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Entity Management Settings

for instances of serializable types that are non persistable otherwise (e.g. a user defined class
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JPA Criteria API Queries

may be preferred. For example, building a dynamic query based on fields that a user fills at runtime