About collection

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JDO Doc
4

setDetachmentRoots(roots)

Method javax.jdo.FetchPlan FetchPlan setDetachmentRoots(   Collection roots ) Set the roots for DetachAllOnCommit. Parameters: roots - Collection of the detachment roots. Since: JDO 2.0
JDO Doc
4

supportedOptions()

Method javax.jdo.PersistenceManagerFactory Collection supportedOptions() The application can determine from the results of this method which optional features, and which query languages ... language is represented by a String: javax.jdo.query.JDOQL Returns: the Collection of Strings representing the supported options. Since: JDO 1.0
JPA Doc
4

values(map)

Method javax.persistence.criteria.CriteriaBuilder Expression<Collection> values(   M map ) Create an expression that returns the values of a map. Parameters: map - map Returns: collection expression Since: JPA 2.0
JDO Doc
4

javax.jdo.PersistenceManagerFactory

See Also: getTransactionType() Constants.JTA Constants.RESOURCE_LOCAL Collection supportedOptions ... a String: javax.jdo.query.JDOQL Returns: the Collection of Strings representing the supported options. Since: JDO 1.0
JPA Doc
4

javax.persistence.AttributeOverride

embeddable class (or embeddable class of one of its attributes). May be applied to an element collection containing instances of an embeddable class or to a map collection whose key and/or value
Issue
4

TYE NullPointerException

a lazy collection that has not been loaded in a detached entity object. Build 2.3.1_03 should fix the exception (but notice that the data will not be available and the collection would look empty ... can become detached? Perhaps a similar issue I've been seeing is related. I have a class with a collection
Forum
3

Left join fetch behaviour doesn't retrieve children?

to fetch my 3 children using a left join fetch. But my collection is null after closing the em ... for all my collection beans. But ... in some cases doing left join (+ distinct) retrieve less parent entities ... test case ( multi join fetch + various jpa collection combinaison + various cascade combinaison + merge
Issue
3

Unexpected Exception during commit

, during commit an attempt to cascade persist through an inverse (mapped by) collection field fails. I ... collections directly with no mappedBy - and it is also much more efficient. Therefore, consider removing ... and improved error messages! A few questions about mapped collections - I do use direct collections
Forum
3

how to query by properties of onetomany relations? (Error 990)

. However, this query is invalid. You cannot navigate through collections in JPQL directly. You have to use JOIN to define a variable that will iterate over the collection elements. This specific query ... navigation from collections (with no JOIN) was just added in build 2.2.4_02. The following program
Forum
3

Performance in large transactions

from Entity2 e where e.start <= "+i+" AND "+i+" <= vec.end" Collection entities ... Entity2 e where e.start <= "+i+" AND "+i+" <= vec.end"     Collection entities ... ++) { : }     em.close(); Embedded vs. Inverse Collections  One of the differences between ObjectDB