About composite
JPA Primary Key
Explains how to define and use primary keys in JPA, including composite and embedded primary keys.... supports explicit standard JPA primary keys, including composite primary keys and automatic sequential value generation . This is ... Application Set Primary Key Composite Primary Key Embedded Primary Key ...
Index Definition
Describes how to define indexes in JPA entity classes and explains how indexes are used in JPQL queries.... topics: Single Field Index Composite Index Multi Part Path Index Indexes in Queries ... fields (not on primary key / version fields). Composite Index A composite index is an index on more than one persistent ...
Merge failure with composite primary key
It was working well with previous releases and now is failing: Exception in thread "main" [ObjectDB 2.3.7_20] javax.persistence.EntityNotFoundException Entity is not found: MergeTest#('Hello',0) (error 631) at com.objectdb.jpa.EMImpl.merge(EMImpl.java:451) at MergeTest.main(MergeTest.java:19) Thanks. ... object), and build 2.3.7_21 should fix it. The composite primary key issue is unclear, since switching to a single primary key ...
possible index required for improving query performance
Hi, I have the following entity class: @Entity @Table @Indices({ @Index(members={"relationshipType", "party"}), @Index(members={"relationshipType", "otherParty"}), @Index(members={"relationshipType"}) }) @XmlRootElement public class Relationship implements Comparable<Relationship> { ... in the existing index). Notice that a composite index can be used as a single index of the first element (with a ... the second or third element, so the order of elements in a composite index makes a difference. ObjectDB Support ...
ObjectDB Object Database Features
ObjectDB provides a rich set of features, many of them as the result of supporting the JPA and JDO APIs.... Single field and multi field ( composite ) indexes. Collection and ... @Id field. Composite primary key - multiple @Id fields or a @EmbeddedId field. ...
javax.persistence.IdClass
Specifies a composite primary key class that is mapped to multiple fields or properties of the entity.(Annotation of JPA)
Is ObjectDB better than competitive object databases?
... supports user defined primary keys including composite primary keys . The support of two standard APIs (JPA and JDO) by ...
Explorer bug ? Objects seem to be missing from database in Class view, but are present as references
objectdb-2.2.5_08 NetbeansID6.9.1+Glassfish3.01 I suspect the following is an Explorer bug. It is marked knowingly as CRITICAL by me because it makes the ObjectDB system unusable for a real project because it appears to be either database integrity corruption, or it just looks like it, which is just as bad. I attach a running project illustrating the problem, as well as screenshots. ... com.greensoft.entity.Activity [null](TEST: activity 4 (AND composite)) INFO: RequestBean []: Persisted: com.greensoft.entity.Activity [21](TEST: activity 4 (AND composite)) INFO: addSubActivityToActivity: subActivityId(17) assigned to ...
ObjectDB Clustering VS Hadoop Hbase
The Hbase is an open source distributed database on Hadoop, it is robust regardless of the performance problem. The ObjectDB cluster may be a distributed database, I guess. But I dont know whether it has only one entry, or each node has an entry. Could you please explain the difference between Hbase and ObjectDB clustering? TIA ... with a price tag of slower performance. In using composite urls the order of the urls defines the connection priority. ...
javax.persistence.EmbeddedId
Applied to a persistent field or property of an entity class or mapped superclass to denote a composite primary key that is an embeddable class.(Annotation of JPA)
