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JPA / JDO Class Enhancer

of compiled classes after compilation. Enhancement is mainly for user-defined persistable classes ... . by using the get and set methods). If you follow this practice only user defined persistable classes ... ), *? wildcards supported <options> include: -cp <dir>  :  path to input user classes -pu <name

General Settings and Logging

" />   <url-history size="50" user="true" password="true" /> <log path="$objectdb/log/" max="8mb ... -history size="50" user="true" password="true" /> ObjectDB manages a list of the recently accessed ... . This feature can be disabled by specifying 0 as the maximum list size. The user attribute specifies

Locking in JPA

update collisions resulting from simultaneous updates to the same data by two concurrent users. Locking ... if the version numbers do not match, indicating that the object has been modified by another user (using ... cannot be granted: A PESSIMISTIC_READ lock request fails if another user (which is represented by

SELECT clause (JPQL / Criteria API)

and user defined embeddable objects) return as results value copies that are not associated ... several other methods for accessing the result data. CriteriaBuilder's construct JPQL user defined result objects ... method builds a CompoundSelection instance, which represents results as instances of a user defined

Server Configuration

is affected also by other elements in the configuration file, particularly the <users> and the <ssl ... " />   <!--   <replication url="objectdb://localhost/my.odb;user=admin;password=admin" />   --> </server ... > elements <replication url="objectdb://localhost/my.odb;user=admin;password=admin" /> The <replication

JPA Persistence Unit

A JPA Persistence Unit is a logical grouping of user defined persistable classes (entity classes ... ://localhost/my.odb"/> <property name="javax.persistence.jdbc.user" value="admin ... Classes JPA requires registration of all the user defined persistable classes (entity classes

Setting and Tuning of JPA Queries

em can be visible to anyone who uses em, even before committing the transaction (but not to users ... uses automatic optimistic locking to prevent concurrent changes to entity objects by multiple users

[ODB1] Chapter 6 - Persistent Objects

the use of makePersistent(...) to instances of user defined persistent classes. However, persistence ... , system types are embedded and user defined types (like the Address instance above) are not ... . Usually, instances of system persistent types are embedded by default, while instances of user defined

[ODB1] Chapter 4 - JDO Metadata

, arrays and references to user defined classes are excluded by default. The default-fetch-group attribute ... whose type is a user defined persistent classes or java.lang.Object. To use embedded objects for fields of user defined persistent classes, a metadata has to be specified as demonstrated by field f5

[ODB1] Chapter 3 - Persistent Classes

Persistent Classes are user defined classes whose instances can be stored in a database using JDO ... instances of user defined persistent classes in the database directly and use the other persistent types ... classpath for input user classes -d output path for enhanced classes -s include

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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