About GROUP BY

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JDO Doc
7

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
7

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
7

java.lang.NullPointerException when using ORDER BY

== 0)) ORDER BY r.startDateTime DESC If we remove the ORDER BY part, the query completes OK ... : Caused by: java.lang.IllegalStateException: com.objectdb.o.InternalException: Unexpected internal ... more                                                                                           Caused by: com.objectdb.o.InternalException: Unexpected
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
Manual
6

Storing JPA Entity Objects

New entity objects can be stored in the database either explicitly by invoking the persist method ... is committed. An IllegalArgumentException is thrown by persist if the argument is not an instance ... is thrown. The exception is thrown either by persist (if that existing entity object is currently
Manual
6

JPA Primary Key

the database is uniquely identified (and can be retrieved from the database) by the combination of its type ... have their own separate identity. Automatic Primary Key By default the primary key is a sequential 64 bit number (long) that is set automatically by ObjectDB for every new entity object that is stored
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