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What's next?

/JPA projects simply by modifying this sample program. Reading the Next Chapters

Entity Management Settings

are "weak", "soft" and "strong". Modified entities are always held by strong references in

Database Management Settings

" operations (which modify the database) have to be recorded. For debugging of query failure

Storing JPA Entity Objects

is called because operations that modify the database require an active transaction. If the database

Database Doctor

. Modifying the database file externally not through ObjectDB (e.g. by malicious software such as

Database Schema Evolution

Modifications to entity classes that do not change their persistent field definitions (their schema) are transparent to ObjectDB. This includes adding, removing and modifying constructors, methods and non persistent fields. However, additions, deletions and modifications to the persistent fields

How to install ObjectDB?

ObjectDB is distributed as a zip file. Just download and extract the ObjectDB distribution zip file. No need to run any install or setup program. You can uninstall ObjectDB by deleting the ObjectDB directory. ObjectDB does not modify the registry or any other system file.

ObjectDB License Agreement [ver. 2.0.4]

of this agreement. 2. The Customer is not allowed to modify the Software or any portion of it in any

JPA Primary Key

Every entity object that is stored in the database has a primary key. Once assigned, the primary key cannot be modified. It represents the entity object as long as it exists in the database. As an object database, ObjectDB supports implicit object IDs, so an explicitly defined primary key is not

Step 3: Define a Spring DAO Component

every operation that modifies the database (such as persist) by transaction begin and commit. The next step is adding a Controller Class.

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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