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Paths and Types in JPQL and Criteria API
Explains how to use object expressions (path navigation, type) in JPA/JPQL.... This page covers the following topics: Navigation through Path Expressions Navigation through a NULL value Entity Type Expressions ...
Database Explorer
Explains how to run and use the ObjectDB object database Explorer to view and manage Java/JPA/JDO objects visually.... represented as child nodes. Tree windows provide easier navigation. Because every reference between two database objects is represented ...
Database Explorer
Explains how to run and use the ObjectDB object database Explorer to view and manage Java/JPA/JDO objects visually.... represented as child nodes. Tree windows provide easier navigation. Because every reference between two database objects is represented ...
Detached Entity Objects
Explains detached entity objects and how to work with detached objects in JPA, including merging them into an EntityManager.... Reference Page... ). Retrieval by navigation from detached objects is not supported, so only persistent fields ...
Navigation through lazy loading from Detached Objects
A main limitation of detached objects (as explained on the Detached Entities manual page) is: ... Entities manual page) is: Retrieval by navigation from detached objects is not supported, so only persistent fields ...
how to query by properties of onetomany relations? (Error 990)
the following code fails em.createQuery("select f from Foo f where f.bars.name = ?1", Foo.class).setParameter(1, barName) stacktrace: ... Support of direct navigation from collections (with no JOIN) was just added in build 2.2.4_02. ... following exception is thrown on attempt to use the new navigation from collection syntax: Navigation from 'java.util.Set<test.Test$Bar>' through ...
Navigation to Collection Elements
Greetings ObjectDB team, Suppose I have a collection typed field (list/map/set...) in my persistent object of class X. Can I navigate (as oppose to using JOIN) to individual elements (in JPA & JDO) ? e.g.: x.list.get(10) x.map.get("key") x.list.get(10).get("key") // the element itself is a map Thanks & Best Regards #1 2010-09-15 05:53 Greetings ObjectDB team, Suppose I have a collection typed field (list/map/set...) in my persistent& ...
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 #1 2010-10-20 11:54 Greetings ObjectDB team, Suppose I pass a List of persistent objects to some query as a paramet ...
Retrieving JPA Entity Objects
Explains how to use JPA to retrieve entity objects from the database.... Retrieval by Eager Fetch Retrieval by Navigation and Access Retrieval by Query Retrieval ... all the entity objects that are reachable from it by navigation through non collection and map persistent fields are also retrieved. ...
JPA Query Expressions (JPQL / Criteria)
Describes JPA query (JPQL / Criteria API) expressions (literals, operators and functions).... (in order of decreasing precedence): Navigation operator (.) Arithmetic operators : * ... Reference Page... , ...). Paths, navigation and types ( get get(attributeName) Path's method ...
