About GROUP BY

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JDO Doc
6

retrieveAll(pcs, useFetchPlan)

the current fetch group must be retrieved, and the implementation might retrieve more fields than the current fetch group. If the useFetchPlan parameter is false, this method behaves exactly as ... are fetched, and other fields might be fetched lazily by the implementation. If the useFetchPlan parameter
JDO Doc
6

retrieveAll(pcs, useFetchPlan)

the current fetch group must be retrieved, and the implementation might retrieve more fields than the current fetch group. If the useFetchPlan parameter is false, this method behaves exactly as ... , and other fields might be fetched lazily by the implementation. If the useFetchPlan parameter
JDO Doc
6

retrieveAll(useFetchPlan, pcs)

the current fetch group must be retrieved, and the implementation might retrieve more fields than the current fetch group. If the useFetchPlan parameter is false, this method behaves exactly as ... , and other fields might be fetched lazily by the implementation. If the useFetchPlan parameter
Forum
6

Mapped By Fetch is very Slow

Well ! I think i pointed out a HUGE performance issue with mapped-by attribute (yeah ... , go the MyEntity class and remove "mapped-by". You obtain 1 second max of query fetch. So my performance issue ... .ALL,mappedBy = "myEntity") // Test by adding / remove "mappedBy" public MyEntityChild getEntityChild
Forum
6

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
6

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
6

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
6

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
Issue
6

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
6

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