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About JDO

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FAQ
97

Which API should I use - JPA or JDO?

You can use ObjectDB with either the Java Persistence API (JPA) or the Java Data Objects (JDO) API ... API, and if necessary, switch to JDO as a secondary API for special additional features that are supported only by JDO. Selecting the more popular API leads to more portable application and extends
JDO Doc
95

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:
FAQ
94

What is the Java Data Objects (JDO)?

The Java Data Objects (JDO) is another standard for accessing persistent data in databases, using ... ), which is designated to be used with relational databases, JDO is designated to be used with both relational and object databases. JDO is supported by many object databases, including ObjectDB
FAQ
61

Is ObjectDB better than competing object databases?

Data Objects (JDO) API than competing object databases. By using a standard API such as JPA ... of two standard APIs (JPA and JDO) by ObjectDB minimizes the risk that during development you may find ... , as part of its support of JPQL (JPA Query Language) and JDOQL (JDO Query Language). ObjectDB is faster than other products.
JDO Doc
39

JDO Annotations for Mapping (ORM)

The following JDO annotations and enums are designated for mapping a JDO object model to a relational database, and are not required by ObjectDB: ObjectDB silently ignores all the above annotations.
Result
39

ObjectDB - Object Database for Java (JPA/JDO)

Objects (JDO) Using a standard Java API (JPA / JDO) provides many benefits, including: Avoiding vendor
JDO Doc
38

javax.jdo.Constants

javax.jdo Interface Constants Implementing Classes: JDOHelper Constant values used in JDO. Since: JDO 2.1 String ANONYMOUS_PERSISTENCE_MANAGER_FACTORY_NAME The name of the anonymous ... , which is the empty string. Since: JDO 2.1 String ELEMENT_INSTANCE_LIFECYCLE_LISTENER The name of the instance
JDO Doc
37

JDO Annotations

JDO defines dozens of annotations that can be divided into the following groups:
JDO Doc
37

JDO Annotations for Classes

JDO supports two modes of persistable classes that can be set by the following annotations: Non persistable classes that should be enhanced (because of accessing persistent fields of other classes directly) can be marked with: The identity mode of persistence capable classes can be specified by using:
JDO Doc
37

JDO Annotations for Fetch Settings

The following annotations are used to define JDO fetch groups and fetch plans: