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102

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 ... Farid Oudjane If it is a bidirectional relationship that is owned by the entities in the collection
98

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 ... efficient way 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
96

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 lsPeter Peter You are right - Scala collections require some special handling, which is not
95

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
94

Custom collection types

Hi In our project in few places there are used collections from emf framework eg EcoreEMap http ... , nevertheless it causes some questions. I checked that i can easily change the type of collection between ... but only their content so I suppose that you treat collections some how differently. Can i achieve
27

JPA Persistable Types

, Date and Math types. Multi value types - Collections, Maps and Arrays. Miscellaneous types: Enum ... are persistable: Collection types from package java.util: ArrayList, Vector, Stack, LinkedList ... ) collection and map types are supported, as long as their values (i.e. elements in collections and arrays
23

Database Explorer

and primary key separated by # (e.g. Point#1). A collection can be specified as a comma separated list ... collection and the query execution time are displayed on the query window. If the query compilation ... deletes the object itself from the database. Editing Collections Elements can be added to collections
20

Retrieving JPA Entity Objects

through all the non collection and map persistent fields (i.e. through one-to-one and many-to-one relationships ... navigation through non collection and map persistent fields are also retrieved. Theoretically, in some ... .LAZY) private Employee manager; : } The default for non collection and map references
2

[ODB1] Chapter 6 - Persistent Objects

by passing a collection or array of objects to makePersistentAll(...), which is another method ... collection or array in the database, but not the collection or array itself (unlike passing a collection ... to iteration over any ordinary Java collection using an Iterator instance. Each call to next() retrieves
2

[ODB1] Chapter 3 - Persistent Classes

, LinkedList, Vector, HashMap, TreeMap and Hashtable, and the interfaces - Collection, Set, List and Map ... and most of the collection classes), but ObjectDB supports all of them. You cannot extend the list to include ... collection interfaces (Collection, Set, List and Map) cannot refer to an unsupported collection, or

Getting Started

ObjectDB is very easy to use. Follow the Getting Started Tutorial and the Quick Tour manual chapter and in minutes you may be able to write and run first Java programs against ObjectDB.

Prior knowledge or experience in database programming (SQL, JDBC, ORM, JPA, etc.) is not required, but some background in using the Java language is essential.

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