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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As noted above, using ObjectDB instead of a relational database and ORM combination is easier and leads to better performance. ORM tools, however, are very useful where the use of a relational ... a JPA ORM provider (Hibernate, TopLink, EclipseLink or DataNucleus) to access relational databases when necessary - with exactly the same code.
Reference (JavaDoc) of JPA 2 ORM annotations.
Hi, I have database utility classes in one project, the id's use sequences declared in an orm.xml ... > and the persistence.xml references this orm.xml : <persistence-unit name="OBJECT_DB_LOCAL_PU ... >/META-INF/orm.xml</mapping-file> <properties> <property name="javax.persistence
, eliminating the intermediate ORM layer further accelerates applications. For instance, ObjectDB processes JPQL (JPA Query Language) and JDOQL (JDO Query Language) queries directly, where ORM tools first
other JPA annotations are designated for Object Relational Mapping (ORM) JPA providers (for mapping between a relational database and an object model and for direct SQL queries): These ORM annotations are silently ignored by ObjectDB.
specify XML mapping files that are added to the default META-INF/orm.xml mapping file. Every annotation
All about JDO Annotations for Mapping (ORM) in Java/JPA database - explanations, examples, references, links and related information.
Static Field javax.jdo.Constants String ORM_XSD_NS The standard JDO object-repository mapping schema namespace. Constant value is http://java.sun.com/xml/ns/jdo/orm. Since: JDO 2.1
Static Field javax.jdo.Constants String ORM_XSD_RESOURCE The name of the resource for the XML schema of the standard JDO object-relational mapping metadata file. Since: JDO 2.1
Static Field javax.jdo.Constants String ORM_DTD_RESOURCE The name of the resource for the DTD of the standard JDO object-relational mapping metadata file. Since: JDO 2.1