About collection

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Manual
20

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
Result
20

ObjectDB Object Database Features

Single field and multi field (composite) indices. Collection and array elements are indexable ... .sql.Time and java.sql.Timestamp. Math types: java.lang.BigInteger and java.lang.BigDecimal. Collection types: Collection, List, Set, ArrayList, Vector, Stack, LinkedList, ArrayDeque, PriorityQueue
Manual
20

Running JPA Queries

is unnecessary and the warning is avoided. The query result collection functions as any other ordinary Java collection. For example, a result collection of a parameterized type can be iterated easily using ... has to be extracted from the result collection after query execution (e.g. by results.get(0)). To eliminate
JDO Doc
20

javax.jdo.Query

. There are three required elements in a Query: the class of the results, the candidate collection ... of the subquery candidateCollectionExpression - the candidate collection of the subquery as an expression using ... to be used in this Query candidateCollectionExpression - the candidate collection to apply
Forum
20

Lazy Init / Eager / Join Fetch collection strategy ? What to choose ?

Hello, I'm doing some tests to choose the best collection fetch strategy. I have entities with many lazy collections and i don't want to load them all. (depends on context) In JPA / Hibernate world ... seems to be more efficient than only fetch required collections. Can you confirm my observations ? To finish, wake
Forum
20

PersistenceManager.getObjectsById(Collection,boolean) throwing JDOException

I have a call to getObjectsById(Collection,boolean) that is throwing a JDOException the first time ... why this might occur? We're using ObjectDB 2.2.4_02. The collection being passed in is a HashSetcollection
Forum
19

No clue how to query with collection

getStreet();     int getStreetNo(); } @Entity class Contact {     Collection
collection with a concatenated value of street + streetNo (if not ... that selecting the first item of a collection ain't be a good idea. now I can select the right item
Issue
19

Collection update does not increase entity version and is not persisted

Hello, I found a bug when adding elements to a collection of Entities: Event { Collection ... to a collection in an object of an old schema, in which the collection was not exist yet (as of changing ... Collection getAttachments() { if (attachments == null) attachments = new
Forum
19

Fetching Collections Puzzle

(which is recommended anyway to improve performance). Paul,   As posted above your collection ... to go and retrive the first element of the collection. This will only work if you are within a transaction ... from Node n left outer join fetch n.children where ....." this will also fetch your collection
Forum
19

Nested Collection Query

if a particular member exist in one of the group? Nesting a collection directly in another collection, although supported by ObjectDB, is not valid in JPA. Accordingly the JPA query language does not ... . The recommended solution is avoid collections of collections, and instead wrap the internal collection in a user defined entity or embeddable class. snoopydoghk