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Navigation to Collection Elements

object of class X. Can I navigate (as opposed to using JOIN) to individual elements (in JPA & JDO ... , you can navigate from any managed entity object to any other reachable managed entity object ... . How about arrays like x.array[1] and x.array[1][2] ? If such navigations in queries lead to performance

Navigation and Parameters

Greetings ObjectDB team, Suppose I pass a List of persistent objects to some query as a parameter, can I navigate to those objects' fields ? E.g.: SELECT x FROM ClassX x WHERE x.a IS MEMBER OF :y.b Thank You ! geekox86 Mohannad AlAwad You cannot navigate from a collection of objects to a field in

Pre-detach loading: retrieval by navigation not working in if statement

-why-retrieval-by-navigation-and-access webel Dr Darren Kelly It could be some sort of JVM optimization

Navigation through Path to evaluate collection

Hello, I need to evaluate a field ("identifier") which is situated in a collection, within an entity. As stated in the documentation it is not possible to navigate there with the dot operator since its a collection. Is it there a way to evaluate this field? Here is the query, the entity

Paths and Types in JPQL and Criteria API

as arguments. Path expressions that navigate from one object to another. Instances of user defined ... . But more often they are used in JPQL path expressions that navigate to values of simple types (number, boolean ... , and they can be used in ordering. Navigation through Path Expressions A path expression always starts

Navigation through lazy loading from Detached Objects

A main limitation of detached objects (as explained on the Detached Entities manual page) is: Retrieval by navigation from detached objects is not supported, so only persistent fields ... for that) but for us the inability to navigate lazy relationships of detached entities is a big showstopper, as we rely

JPA Entity Fields

the database, but is still available after retrieval by a special automatic query. Note: Navigation through inverse fields is much less efficient than navigation through ordinary persistent fields ... , and maintaining two unidirectional relationships is usually much more efficient (unless navigation

Retrieving JPA Entity Objects

navigation through non collection and map persistent fields are also retrieved. Theoretically, in some ... is retrieved all the referenced Project instances are also retrieved automatically. Retrieval by Navigation ... of objects is available for navigation, regardless of the fetch policy. The fetch policy, however, does

[ODB1] Chapter 9 - ObjectDB Explorer

database objects visually, navigate among them and execute queries is very valuable during development ... the browser window is in navigation among objects. Because every reference between two database objects is represented by a parent-child relationship in the tree, you can navigate among objects by expanding

[ODB1] Chapter 6 - Persistent Objects

. Objects with names are called root objects in object databases, because navigation in the database ... , all the objects that are reachable from it can be retrieved simply by navigating through the persistent ... with names) are also always reachable. In addition, every object that can be accessed by navigation from

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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