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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support for the two standard Java database APIs: Java Persistence API (JPA) Java Data Objects (JDO) Using a standard Java API (JPA / JDO) provides many benefits, including: Avoiding vendor lock in
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
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:
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
A JDO metadata file is an XML file with a '.jdo' suffix, containing information about one or ... . The metadata is used first by the JDO Enhancer, and later by the JDO system. Therefore, at deployment, .jdo metadata files must be packaged with an application's .class files and the other resources
environment for using JDO. Explanations on how to use this environment to do database operations, such as ... 6). 5.1 javax.jdo.PersistenceManagerFactory Most applications require multiple database connections ... that every connection consumes. Database connections are managed in JDO by the javax.jdo
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.
The following types can be used to implement external listener classes for JDO lifecycle events: Listener objects can be bound to one or more persistence capable classes by invoking the addInstanceLifecycleListner method either at the PersistenceManagerFactory level or the PersistenceManager level.
The following interfaces can be implemented by persistence capable classes in order to response to JDO lifecycle events:
This section contains miscellaneous JDO annotations and associated enum types: