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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This reference contains the API documentation (similar to JavaDoc) of the Java Persistence API (JPA) 2.0. The content is derived from the original JPA documentation (in the EclipseLink JPA 2 RI ... into the following sections: The purpose of these documentation pages is to serve as a reference. In
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:
All about ObjectDB API Reference in Java/JPA database - explanations, examples, references, links and related information.
for entities: The ref attribute specifies the reference type for holding non dirty entities in ... ", "soft" and "strong". Modified entities are always held by strong references in the persistence
, arrays and references to user defined classes are excluded by default. The default-fetch-group attribute ... attribute is relevant for persistent reference fields. It indicates whether or not the content of the referred object should be stored as part of the referring object, as an embedded object. Embedded
navigation. Because every reference between two database objects is represented by a parent-child ... to construct and store the new entity objects. Editing Values and References You can edit simple field ... the new value. Use the Edit > Edit Multi Line String command to edit a multi line string. Reference
accessed. The getReference method is useful when a reference to an entity object is required but not its content, such as when a reference to it has to be set from another entity object. Retrieval by Eager ... unacceptable. A persistent reference field can be excluded from this automatic cascaded retrieval by
 and instruct ObjectDB to use soft reference for its Level One (L1) object data cache. I disable the L2 cache ...  and uses a soft reference to make that array eligible for GC when the JVM does a full GC. private byte ... called to manipulate the softReferenceData in my JdoBlob2 instances, so there is a strong reference
prevents broken references in the database and simplifies development. The JDO specification limits ... . An embedded object cannot be shared by references from multiple objects. In addition, embedded ... or queried directly (an embedded object can only be retrieved using a reference from its containing
. As example (like in the attached example): We have an EntityA that have a reference to an EntityB ... , because it's possible that many other entities have just a ID based reference with a simple 'int' field to this element. And we thought that also the real references are based on the ID. This step