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Manual
22

Retrieving JPA Entity Objects

collection and map persistent fields (i.e. through one-to-one and many-to-one relationships ... through non collection and map persistent fields are also retrieved. Theoretically, in some extreme ... ) private Employee manager; : } The default for non collection and map references is FetchType
Manual
19

FROM clause (JPQL / Criteria API)

collection of the outer c1. In this case, by propagation of a WHERE constraint to the FROM phase ... over specified collections of objects. The following query uses one range variable and one join ... that collection. You might have noticed that this query is equivalent to the previous neighbors query
Manual
19

JPA Entity Fields

: OneToOne, ManyToOne - for references of entity types. OneToMany, ManyToMany - for collections ... , since it requires running queries. Inverse fields are essential for collection fields when using ORM JPA ... very large collections that are changed often. This is because a change in the inverse field does not
JDO Doc
18

javax.jdo.PersistenceManager

a PersistenceManager might release it to the pool of available PersistenceManagers, or might be garbage collected ... - a Collection of persistent instances Since: JDO 1.0 See Also: deletePersistent(Object pc) void deletePersistentAll(Collection pcs) Delete a Collection of instances from the data store. Delete a Collection
Forum
18

Optimistic locking: prevent version increment on entity collection attribute

Hello, I have an entity E with an attribute which is a collection of entities (one to many ... the increment of the version of entity E when entities are added to or removed from the collection ... If it is a bidirectional relationship that is owned by the entities in the collection (i.e. the collection
Forum
17

Query to search for common elements in two separate collections.

I'm trying to work out the most efficient way to build a query that can compare two collections ... is to use some sort of hash function for the collections and to retrieve candidate collections by identical hash code. Candidate collections should then be further filtered by checking for equality. The hash
Forum
17

Using Scala collections with ObjectDB

Hi, I cannot see that it is possible to make scala collection classes persistable within ObjectDB ... .collection._  api for it to work ? (http://www.scala-lang.org/docu/files/collections-api/collections.html)   /Peter   You are right - Scala collections require some special handling, which is not
Forum
17

collection of embedded objects

1. In general, are there any restrictions of the use of @Embedded objects in collections, compared to @Entity? 2. If you have a large nested collection of @Embedded objects, and you remove the parent @Entity, does the remove cascade through the whole collection? 3. Is searching through collections
Manual
17

Index Definition

. Arrays and collections that contain values of the above types (including null). Indexes ... ; : } Notice that the paths include a collection, so multiple values will be maintained by the index ... above, the index order should be x first and y second. Indexes on collections are useful in JOIN queries
Manual
17

Running JPA Queries

and the warning is avoided. The query result collection functions as any other ordinary Java collection. A result collection of a parameterized type can be iterated easily using an enhanced for loop ... collection after query execution (e.g. by results.get(0)). To eliminate this routine operation JPA