About GROUP BY

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Forum
7

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

/questions/35359676/java-jpa-objectdb-pre-detach-loading-why-retrieval-by-navigation-and-access ... system a BooleanValue wrapper is ultimately an Element that can be referenced by ID, and meets ... boolean value is not the whole story.   By JVM optimizations I meant JIT Compiler optimizations and not
Forum
7

Strange behaviour with ORDER BY and IN

Hi, after trying out objectdb for a while now and being quite impressed by its speed and overall performance I noticed a strange behaviour where an ORDER BY - directive isn't executed as ... by a simple member (e.g. a String) being the Entity-ID and, at the same time, filter on this member
Forum
7

ORDER BY problem, when String starts with language specific character

Dear all, I have a problem with ORDER BY clause. I have a simple query: select u from User u order by u.name When the name starts with "normal/english" character, records are ordered correctly ... to JPQL and JDOQL) you can use the Normalizer expression directly in the query ORDER BY clause
Forum
7

Suspected memleak caused by bad state of EntityManager

and using. We find a slow memleak in our application recently, and by trace of Entity construct and finalize, we found the problem is caused by bad state of EntityManager. After first throwing ... and retrieved by EntityManagerFactory, and the instances of Entity constructed by ObjectDB
Forum
7

Should derived fields of an EmbeddedId be manually maintained by app code?

, of type ECompoundKeyMapItem, identified by their "key" within the EContainer class. The items ... "ECompoundKeyMapSubItem", identified by their keys. The embeddedId for the item class, ECompoundKeyMapItemId ... = parent; } [ObjectDB 2.3.0_01] Unexpected exception (Error 990) Generated by Java HotSpot(TM
Issue
7

Removed entities can be found by query in the same transaction

Hello, we opened a transaction, load an entity from database and removed this entity by em.remove(). Afterwards the entity can be load again by query although the resulted entity have an attribute ... . Every snapshot represents a picture of the database as seen by a particular transaction. When changes
Forum
7

Cannot sort descending, when ordering by caluculated float in a method

Hi, I have found an issue in ordering by a method. I have two entities : Invoice and InvoiceItem ... ...) select i from Invoice i order by i.getPrice() desc/asc it gives the same order for desc and asc ... .createQuery(             "SELECT i FROM Invoice i ORDER BY i.getPrice() DESC");         List resultList
Forum
7

Merge of entity classes with "mapped by" very slow

Hi, I have found a strange behavior when merging entities with "mapped by" set on @OneToMany ... - one with mapped by, second with adding entities list without "mapped by". The difference is huge event for such small objects - 2ms (without mapped by) vs ~50ms (with mapped by) Is there any chance
Issue
7

Bulk load of eager mapped by (inverse) relationships

When a collection of objects is retrieved by ObjectDB (e.g. by a query) ordinary referenced objects ... . However, inverse (mapped by) references that have to be loaded eagerly currently do not participate ... a separate client-server round trip. Future versions of ObjectDB should load eager mapped by (inverse
Issue
7

Lazy loading of mapped by (inverse) singular references

ObjectDB ignores lazy setting of non collection mapped by (inverse) fields and loads them always eagerly. This is allowed by JPA since lazy is only hint but it is not efficient. The reason ... , so it is always available. For mapped by (inverse) reference fields no information is stored in the entity