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About LEFT OUTER JOIN

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Forum
18

LEFT JOIN FETCH over empty embedded collection returns no results

, but I attempt to LEFT JOIN FETCH all the members of a collection within a (non-existent) member ... where bList is empty, the following works (returns my instance of C): SELECT c FROM C c LEFT JOIN ... list: SELECT c FROM C c LEFT JOIN FETCH c.bList LEFT JOIN FETCH c.bList.val WHERE id=:id
Forum
17

multiple LEFT JOINs do not work as expected

like this: SELECT DISTINCT $1 FROM Organisation $1 JOIN $1.attributeList $2 LEFT JOIN $1.parentOrg $3 LEFT JOIN $3.parentOrg $4 WHERE ((($2.name='Attribute1') AND ($2 ... , since I use LEFT Joins this query should return all organisation under the root organisation
JPA Doc
16

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
Forum
14

LazyInitialization / join fetch

descrica2_2_3_ from the User usuario0_ left outer join on area area1_ usuario0_.codigo_area = area1_.codigo left outer join on User usuario2_ usuario0_.codigo_chefe = usuario2_.codigo left outer join company empresa3_ on usuario2_.codigo_empresa = empresa3_.codigo left outer join on specialty especialid4
Manual
14

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
12

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
Forum
11

Query with FETCH JOIN returns multiple results instead of one.

Department d LEFT JOIN FETCH d.employees WHERE d.deptno = 1 "A fetch join has the same join semantics as the corresponding inner or outer join, except that the related objects specified on the right-hand ... jpqlResult = em.createQuery( "SELECT d FROM Demand d JOIN FETCH d.services WHERE d=:demand
Forum
11

JPQL JOIN FETCH Error

Hello I get an error when executing the following JPQL query: select doi from Doi doi left join fetch doi.metadata metadata left join fetch metadata.titles titles left join fetch metadata.creators creators left join fetch metadata.descriptions descriptions left join fetch metadata
FAQ
10

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
9

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