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forum_thread

Welcome

Welcome to ObjectDB Forum #1 2010-05-13 15:13 Welcome to the new ObjectDB Website and the new ObjectDB Forum! ObjectDB Support Object ...

 
release

2.5.0

Release date: 2013-04-16 Download (5.42 MB) Binary:  objectdb-2.5.0.zip You should start by following a  tutorial or reading the manual ...

 
manual

JPA Query Structure (JPQL / Criteria)

Explains the structure of a JPQL query, which consists of 6 clauses: SELECT, FROM, WHERE, GROUP BY, HAVING, ORDER BY.... and persistent fields, which are case sensitive. In addition, string literals are also case sensitive (e.g. "ORM" and "orm" are ...

 
api-jpa

javax.persistence.NoResultException

Thrown by the persistence provider when Query.getSingleResult() or TypedQuery.getSingleResult()is executed on a query and there is no result to return.(Exception of JPA)

 
api-jpa

javax.persistence.JoinTable

Used in the mapping of associations.(Annotation of JPA)

 
forum_thread

Queries are slow on a large database

Hi, I have a 12GB database with 787603 entries. It is much larger than usual and there are performances issues. I am doing small queries and they take much longer than I expect, i.e.: Get the total number of entries Get 25 consecutive entries (i.e. 0-25) Get one specific entry On average each query needs 4 to 5 minutes to return a result. I have been adviced to use indexes but they are already used through the JDO Metadata file. For instance I use this class: ... as the database file is not sufficient. In addition, consider using composite indexes as suggested in #2 above. The sample ...

 
api-jdo

javax.jdo.JDOException

This is the root of all JDO Exceptions.(Exception of JDO)

 
forum_thread

Using your own classes in the entity class?

When I use other objects from other self-made classes in the JPA Entity Class I get the following error code: #1 2016-02-08 14:48 This post is solved edit delete ...

 
api-jpa

javax.persistence.Column

Is used to specify the mapped column for a persistent property or field.(Annotation of JPA)

 
api-jpa

PessimisticLockScope.NORMAL

This value defines the default behavior for pessimistic locking.(Enum Constant of javax.persistence.PessimisticLockScope)