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Deleting JPA Entity Objects

object references, if any). Orphan Removal JPA 2 supports an additional and more aggressive remove

Is ObjectDB a NoSQL Database?

, but they are easier to use in object oriented languages such as Java. In addition, unlike most other NoSQL databases

Shared (L2) Entity Cache

of this cache makes it useful in applications that use many short term EntityManager instances. In addition

JPA Annotations for Relationships

annotation enables configuring cascade and fetch policy, using the following enum types: Additional

JPA 2 Annotations

JPA defines dozens of annotations that can be divided into the following groups: Annotations for JPA aware classes: Annotations for fields in JPA persistable classes: Annotations for additional JPA configuration: Annotations for JPA lifecycle event callbacks: Java EE container annotations: Many

ObjectDB Object Database Features

from failure by using a recovery file and double writing. Additional recovery layer - supports

ORDER BY clause (JPQL / Criteria API)

this case, the first expression is the primary order expression. Any additional order expression

Getting Started with JPA

: In addition the demonstrated application is available as a Maven project:

Which API should I use - JPA or JDO?

API, and if necessary, switch to JDO as a secondary API for special additional features

JDO Reference (JavaDoc)

This reference contains the API documentation (similar to JavaDoc) of JDO 2.2. The content is derived from the original JDO documentation with some additions and notes. The most basic JDO types are: All the other JDO types are organized into the following sections:

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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