About join

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Manual
154

FROM clause (JPQL / Criteria API)

, a full iteration over the Cartesian product is avoided. [INNER] JOIN As discussed above, range ... an additional type of identification variable, a join variable, which represent a more limited iteration over specified collections of objects. The following query uses one range variable and one join
JPA Doc
84

javax.persistence.criteria.Join

javax.persistence.criteria Interface Join Superinterfaces: Expression, FetchParentjoin to an entity, embeddable, or basic type. Since: JPA 2.0 Learn how to use JPA criteria API's Join in Chapter 4 of the ObjectDB/JPA manual. Selection alias(String name
Manual
74

Paths and Types in JPQL and Criteria API

. It might be easier to understand exactly how this works by considering the equivalent JOIN query ... , Join and Join's descendants). Path Expressions The Root and Join interfaces (which are subinterfaces ... > country = query.from(Country.class); Join neighborCountry = country.join
JPA Doc
65

Criteria Query From Elements

(bound by an entity class) are represented by the Root subinterface: Join variables (bound by an attribute of a preceding variable in the FROM clause) are represented by the Join subinterface and its descendant interfaces: See the FROM in Criteria Queries section for more details and examples. Join
JDO Doc
57

javax.jdo.annotations.Join

javax.jdo.annotations Annotation Join Target: Classes and fields (including property get methods) Annotation for the join of a relation. Corresponds to the xml element "join". Since: JDO 2.1 String column Name of the column in the join table. Name of the column in the join table. Returns: the name
FAQ
54

What are the main benefits of using ObjectDB?

that ability and require multiple tables, multiple records and join operations in order to support
JDO Doc
49

javax.jdo.annotations.Joins

javax.jdo.annotations Annotation Joins Target: Classes Annotation for a group of joins. Since: JDO 2.1 Join[] value The join definitions used for the mapping of this type. The join definitions used for the mapping of this type. Joins for secondary tables are usually defined at the type level
JPA Doc
48

join(attribute, jt)

Method javax.persistence.criteria.From Join join(   SingularAttribute attribute,   JoinType jt ) Create a join to the specified single-valued attribute using the given join type. Parameters: attribute - target of the join jt - join type Returns: the resulting join Since: JPA 2.0
JPA Doc
48

join(attributeName, jt)

Method javax.persistence.criteria.From Join join(   String attributeName,   JoinType jt ) Create a join to the specified attribute using the given join type. Parameters: attributeName - name of the attribute for the target of the join jt - join type Returns: the resulting join Throws
JPA Doc
48

join(collection, jt)

Method javax.persistence.criteria.From CollectionJoin join(   CollectionAttribute collection,   JoinType jt ) Create a join to the specified Collection-valued attribute using the given join type. Parameters: collection - target of the join jt - join type Returns: the resulting join Since: JPA 2.0