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JDO Doc
44

Constants.OPTION_MAPPING_NON_JOINED_TABLE_PER_CONCRETE_CLASS

Static Field javax.jdo.Constants String OPTION_MAPPING_NON_JOINED_TABLE_PER_CONCRETE_CLASS "javax.jdo.option.mapping.NonJoinedTablePerConcreteClass" Since: JDO 2.1 See Also: PersistenceManagerFactory.supportedOptions()
JDO Doc
44

Join.extensions

Annotation Element javax.jdo.annotations.Join Extension[] extensions Vendor extensions. Returns: the vendor extensions Default value: {} Since: JDO 2.1
JDO Doc
44

Join.foreignKey

Annotation Element javax.jdo.annotations.Join String foreignKey Name for a generated foreign key constraint. Returns: the name of the generated foreign key constraint Default value: "" Since: JDO 2.1
JDO Doc
44

Join.index

Annotation Element javax.jdo.annotations.Join String index The name of the index to generate. Returns: the name of the index Default value: "" Since: JDO 2.1
JDO Doc
44

Join.primaryKey

Annotation Element javax.jdo.annotations.Join String primaryKey Name for a generated primary key constraint. Returns: the name of the generated primary key constraint Default value: "" Since: JDO 2.1
JDO Doc
44

Join.uniqueKey

Annotation Element javax.jdo.annotations.Join String uniqueKey The name of the unique key constraint to generate. Returns: the name of the unique key constraint Default value: "" Since: JDO 2.1
JPA Doc
43

javax.persistence.criteria.From

>, Path, Selection, TupleElement Subinterfaces: CollectionJoin, Join, ListJoin, MapJoin ... , but may also be an embeddable belonging to an entity in the from clause. Serves as a factory for Joins ... Since: JPA 2.0 Fetch fetch(String attributeName) Create a fetch join to the specified attribute using
JPA Doc
43

javax.persistence.criteria.Root

> fetch(String attributeName) Create a fetch join to the specified attribute using an inner join. Create a fetch join to the specified attribute using an inner join. Parameters: attributeName - name of the attribute for the target of the join Returns: the resulting fetch join Throws
Forum
25

Query in JPA2 with LEFT JOIN on INNER JOIN

How write a query in JPA2 with LEFT JOIN on INNER JOIN? select a.description, a.id, p1.description, p2.description,p3.description from action a left join action_profile ap1 on ap1.id_action=a.id inner join profile p1 on ap1.id_profile=p1.id and p1.name='?' left join action_profile ap2 on ap2
Result
24

ObjectDB Object Database Features

elements are indexable (extremely fast JOIN queries). Map keys and values are indexable. Nested paths ... query FETCH JOIN. Configurable JDO fetch groups. Ease of Use and Learning ObjectDB is very simple ... (including INNER JOIN, LEFT OUTER JOIN and JOIN FETCH). WHERE (with both JPQL and JDOQL expressions