About entities

forum_thread

Using List to save data

Hello, How can I save data dynamically such as "List" in Java -> ArrayList, LinkedList, etc. thanks Seena Abdollahi Seena Abdollahi Software Engineer #1 2012-07-16 05:37 Hello, How can I save data dynamically such as "List" in Java -> ArrayList, LinkedList, etc. t ...

 
issue

Exception in thread "main" java.lang.NoSuchFieldError: __odbTracker

Hi   there is something wrong with enhancement process I got that class was succesfully processed, log has size 0, enhancer is from build objectdb-2.2.8_08 and during object creation when some filed is initialised i got an exception   Exception in thread "main" java.lang.NoSuchFieldError: __odbTracker at com.package.Network.__odbSet_Connections(Network.java:1) at com.package.Network.<init>(Network.java:95) at com.package.EnhancementTest.main(EnhancementTest.java:14)   Bug Version: 1.04 Priority: Normal Status: Closed Replies: 3 Type:  Bug ...

 
forum_thread

Partial Indexing

I have a question about partial indexing. For example, a field of String type ttt, will be distinguished by the first 5 characters, then I can make a index of substr(ttt,1,5) in MySQL. With ObjectDB, how can I write the annotation for this purpose? TIA Institute of Computer Technologies #1 2011-05-22 12:24 I have a question about partial indexing. For example, a field of String type ttt, will be distinguished ...

 
forum_thread

More Efficient Primary Keys

Can you give us a recommendation as we can represent the Key (UUID) most efficient? Both in terms of memory usage of the database files, memory usage of the JVM and efficiency for queries. We already need the key before the entities are persisted so that we can build even references. ... for queries. We already need the key before the entities are persisted so that we can build even references. a) ...

 
api-jpa

OneToOne.fetch

(Optional) Whether the association should be lazily loaded or must be eagerly fetched.(Annotation Element of javax.persistence.OneToOne)

 
forum_thread

Multi-Threading/Distributed-Database Questions...

Greetings ObjectDB team, All below questions assume a very large database (~1,000,000,000 objects): Q1: In what cases would ObjectDB utilize multi-threading ? how about in JOIN operations ? Q2: Is it true that two read-only JPQL queries accessing the same database file actually run simultaneously if placed into two independent threads ? no I/O synchronization bottlenecks ? #1 2011-01-02 04:15 Greetings ObjectDB team, All below questions assume a very large database (~1,000,000,000 objects): Q1: ...

 
api-jpa

javax.persistence.metamodel.ListAttribute

Instances of the type ListAttribute represent persistent javax.util.List-valued attributes.(Interface of JPA)

 
api-jpa

javax.persistence.metamodel.StaticMetamodel

The StaticMetamodel annotation specifies that the class is a metamodel class that represents the entity, mapped superclass, or embeddable class designated by the value element.(Annotation of JPA)

 
issue

com.objectdb.o.InternalException: java.lang.ArrayIndexOutOfBoundsException: 2

com.objectdb.o.InternalException: java.lang.ArrayIndexOutOfBoundsException: 2 java.lang.ArrayIndexOutOfBoundsException: 2 at com.objectdb.o.UTY.aG(UTY.java:1275) at com.objectdb.o.ENH.b(ENH.java:102) at com.objectdb.o.LDR.J(LDR.java:796) at com.objectdb.o.LDR.UW(LDR.java:1023) at com.objectdb.o.CST.ab(CST.java:478) at com.objectdb.o.CST.U4(CST.java:414) at com.objectdb.o.LDR.F(LDR.java:559) at com.objectdb.o.LDR.E(LDR.java:466) at com.objectdb.o.OBC.UJ(OBC.java:1073) Bug Version: 2.5.3 Priority: Normal Status: Active Replies: 2 Type:  Bug ...

 
forum_thread

How to define database structure and insert some initial objects from scratch

Hi from Spain! We're evaluating ObjectDB and we have some questions: - How can we create the initial database structure of our application? We know objectdb is all about objects and probably not need initial structure like tables, but how can we populate some "tables" with initial data from a script? In SQL world we have scripts like "insert into..." - Can we use main objectdb.jar library as jdbc driver for ETL software like Kettle? How about migrating data from another database system? #1 2012-02-23 19:18 Hi from Spain! We're evaluating ObjectDB and we have some questions: - How can we create the ...