About collection

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JPA Doc
4

MapKeyJoinColumn.table

that contains the foreign key column. If the join is for a map key for an element collection, the foreign key column is in the collection table for the map value. If the join is for a map key ... that is the value of the map. Default: If the map is for an element collection, the name of the collection
JPA Doc
4

PessimisticLockScope.EXTENDED

for PessimisticLockScope.NORMAL, element collections and relationships owned by the entity that are contained ... collection generally locks only the rows in the join table or collection table for that relationship or collection. This means that phantoms will be possible. Since: JPA 2.0
Issue
4

Best practise loading big data

. Garbage collection does not gain enough free memory. We experimented a bit but so far ... (which prevents garbage collection) to non dirty entity objects. Can you share a heap dump ... . So if we do not reference the entities, GC can collect them. But it looks like there is some
JDO Doc
4

addSubquery(sub, variableDeclaration, candidateCollectionExpression, parameters)

with a PersistenceManager, the candidate collection or extent, result class, and range limits are not ... . If the trimmed value is the empty String, or the parameter is null, then the candidate collection ... of the subquery candidateCollectionExpression - the candidate collection of the subquery as
JDO Doc
4

deletePersistentAll(pcs)

Method javax.jdo.PersistenceManager void deletePersistentAll(   Collection pcs ) Delete a Collection of instances from the data store. Parameters: pcs - a Collection of persistent instances Since: JDO 1.0 See Also: deletePersistent(Object pc)
JPA Doc
4

ElementCollection.targetClass

embeddable class that is the element type of the collection. This element is optional only if the collection field or property is defined using Java generics, and must be specified otherwise. It defaults to the paramterized type of the collection when defined using generics. Default value: void.class Since: JPA 2.0
JDO Doc
4

evictAll(pcs)

Method javax.jdo.PersistenceManager void evictAll(   Collection pcs ) Mark a Collection of instances as no longer needed in the cache. Parameters: pcs - the Collection of instances to evict from the cache. Since: JDO 1.0 See Also: evict(Object pc)
JDO Doc
4

executeWithArray(parameters)

and return the filtered Collection. The execution of the query obtains the values of the parameters ... element in the candidate Collection is examined to see that it is assignment compatible to the Class ... . Parameters: parameters - the Object array with all of the parameters. Returns: the filtered Collection. Since: JDO 1.0
JPA Doc
4

in(values)

Method javax.persistence.criteria.Expression Predicate in(   Collection values ) Create a predicate to test whether the expression is a member of the collection. Parameters: values - collection of values to be tested against Returns: predicate testing for membership Since: JPA 2.0
JPA Doc
4

in(values)

Method javax.persistence.criteria.Expression Predicate in(   Expression<Collection> values ) Create a predicate to test whether the expression is a member of the collection. Parameters: values - expression corresponding to collection to be tested against Returns: predicate testing for membership Since: JPA 2.0