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43

using objectdb.jar in writing data to mariadb or mysql db

(for desktop version) and python or php for the web version but i want to code queries in native java ... to mariadb or mysql using native java JPA API and in some cases JPQL or must i store to an Objectdb unique ... created. How reliable in a production environment is this? Can objectdb handle client - server
43

Problem with log file in an embedded db with netbeans platform application

:" and ":" is not allowed in ntfs filesystem). I can't understand if the problem is with objectdb or ... me with any suggestion or to find a solution? Thanks in advance paolutus Paolo Malpeli A possible ... and log-archive directories (in objectdb.conf) explicitly. support Support Thanks for the answer, I
43

internal object DB locking in an embedded multi threaded application

Hi, we are using Embeded objectDB 2.4.4_06 in a highly multithreaded concurrent manner and we have noticed a performance problem in our application that seems to be attributed to ObjectDb's internal locking. When profiling our app in JVisualVm we notice a large number of threads are blocked
43

ObjectDB and Hibernate in one JVM?

Hi all, I need to persist my application data and also access a legacy RDBMS system in the same ... system to access RDBMS. Is it possible to use both ObjectDB and Hibernate in the same application ... You can use both Hibernate and ObjectDB in the same Java application. If the Hibernate version
43

Restrict by class in query

of type Folder (I have a class hierarchy in which both Link and Folder are subclasses of a common root ... name into the database, and execute the above query, I get a List<Folder> with two entries in ... ) call to fetch the result. Am I doing something wrong to make sure that I only get folders in
43

Using aliases in WHERE clause

.status IS NOT NULL Unfortunately, 'i' alias doesn't work in WHERE clause : Query Execution Error ... ProjectPartInfo ppi WHERE  ==> i <== .status IS NOT NULL When i change 'i' to 'ppi.inquiries' in ... WHERE ppi.inquiries.status IS NOT NULL However, 'i' alias works in ORDER clause (query below also runs
43

JPQL query to get entities that does not have a child entity in their child entities

: @NamedQuery( name = "findFinishedJobsBetweenTimeIntervals", query = "SELECT J FROM JobEntity J, IN(J ... = "findCanceledJobsBetweenTimeIntervals",   query = "SELECT J FROM JobEntity J, IN(J.statuses) JS ... ( name = "findFailedJobsBetweenTimeIntervals",   query = "SELECT J FROM JobEntity J, IN(J.statuses) JS
43

Memory use in OneToMany relationships

Hello everyone, I have a question regarding the OneToMany / ManyToOne Relationship in ObjectDB. So imaging following setup: We have class A which holds an collection (List, Arrray ...) of class B. In ... and enhancement mode. In enhancement mode, each PicData is loaded when it is accessed. In
43

Multi selection and distinct in a criteria query

of CriteriaQuery. There are some relevant examples in the manual. support Support Ok yes I am aware of that sorry ;) What I was trying to say.. how can I restrict the DISTINCT to the first selection element in ... supported neither in JPQL nor in criteria queries. But does it make sense? Results with identical
8

Internal exception: NPE on criteria query with IN clause and empty collection

Hello ObjectDB team, I receive following exception in my application: [ObjectDB 2.7.3_01 ... already narrowed the cause to the fact that I use JPA criteria query API, and I pass an empty collection to IN ... (rootService); cq.where(rootService.get("key").in(templateKeys)); //templateKeys is empty by mistake

Getting Started

ObjectDB is very easy to use. Follow the Getting Started Tutorial and the Quick Tour manual chapter and in minutes you may be able to write and run first Java programs against ObjectDB.

Prior knowledge or experience in database programming (SQL, JDBC, ORM, JPA, etc.) is not required, but some background in using the Java language is essential.

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