55 | Embedding Managed Entities in Embedded Objects = bad ideaDiscovered that you can't embed entities in embeddable objects if the entity is managed. Haven't tried embedding un-managed entities in embeddable objects, though I imagine that's not a great idea. The the error message isn't all that obvious (attempting to persist object which already has an id |
55 | Merge with Parent/Child entities not possible javax.persistence.Entity; import javax.persistence.EntityManager; import javax.persistence ... ; import org.junit.Before; import org.junit.Test; public class ObjectDbMergeTest { @Entity ... = id; } } @Entity public static class ChildEntity { @Id @GeneratedValue private |
55 | How to check if an entity exists in a Database without loading it?Hi, I am trying to speed up some code - where i check if an entity exists in order to make a decision. In Java - It looks like this (pk - is the primary key of the entity): MyClass find = em.find ... without loading the entity? Thanks EKK Emmanuel Keskes You can use a query: SELECT e.pk FROM MyClass e |
55 | Cascading (persist) with a mix of enhanced and not enhanced entitiesWe find out that it is actual not possible to use enhanced and not enhanced entities together. Exist any limitations regarding the use of enhanced and non-enhanced entities? We work based feature ... the entities during development is, because of our build environment, very time-consuming |
55 | Entity has be persistended,but query not fetched?I create a new entity T newT and persistend it,then I create a query "select t from T t" to fetch all T entities.But then the newT is not contain in the query result. Why? code order: query ... ().rollback(); em.close(); emf.close(); } @Entity static final class |
55 | Entity factoryHi, is it possible to create Entities with a custom factory? I want to create Entity instances via dependency injection like: @Entiy public class User { private final UserService userService ... injection method: I store the current Context in a ThreadLocal and access it inside the new Entity to inject the dependencies. doppelrittberger Markus Ritter |
55 | Removing an entity throws exception to remove customer entity, when it's read by a query (it's attached), it throws this exception ... more After this exception is the entity detached (why?). When I merge it, I can remove it without problems... The Customer class code: @Entity public class Customer implements Serializable { private static |
11 | Allow removal of entity class from ObjectDB & ExplorerHi. It would be very useful to be able to delete an entire entity class from ObjectDB ... , thus they're limited to 10 entities / db. During the life time of a software, many changes appear to its data structure. When an entity class becomes unnecessary, we should be able to remove |
11 | Entity field renaming does not workHello, we use the ObjectDB version 2.8.5_05. We want to rename a field in an entity and it does not work: from: package com.btc.ep.analysis.verdict.tolerance.bl.internal.dmos; @Entity @Access ... > </package> </schema> We have also class and package renaming for other entities and it works |
11 | Problem using "and" for joined entities and indexed fields list. public class IndexTest { @Entity @Indices({ @Index(members = {"children ... if you query the children directly (if they are defined as entity objects), not through the parents ... that you may also consider is to switch the children from embedded objects to entity objects and then using single field |
