About reference

forum_thread

Efficient query on EmbeddedId

Hi! I have an entity class with an @EmbeddedId (field1 int and field2 int). Based on the manual, I understand that making a query just on entity.id.field1 is efficient. Of course, making a query containing the whole EmbeddedId is the ideal case, and I use it, but I need more use cases. ... value is a bit more efficient. This is because a reference type is larger than an int value in ObjectDB internal data ...

 
release

2.2.0

Release date: 2011-04-03 Download (3.99 MB) Binary:  objectdb-2.2.0.zip You should start by following a  tutorial or reading the manual ...

 
release

2.0.2

... New error message when persisting a reference to a new (non managed) entity object. Fixed a bug in ...

 
api-jdo

javax.jdo.Transaction

The JDO Transaction interface provides for initiation and completion of transactions under user control.(Interface of JDO)

 
forum_thread

Time Sequence Object Command DB

We (www.s2ssystems.com) have a time-sequential object command database.  I would like to see if it can be built and run efficiently on ObjectDB.   The requirements that drive the design of this database are: ... and Command . Every Transaction will hold a reference to a parent Transaction , and possibly also to child transactions, ...

 
api-jdo

javax.jdo.spi.StateInterrogation

This interface is implemented by a non-binary-compatible JDO implementation to provide state interrogation for non-enhanced persistent classes.(Interface of JDO)

 
release

2.0.1

... New error message when persisting a reference to a new (non managed) entity object. Fixed a bug in ...

 
forum_thread

Compress ODB file with XML content

Harman company requested to reduce ODB size as much as possible after database created and one of unliked solution was to use ZIP/UNZIP after/before use object DB database. Harman would like to ask Object Db team about possible internal methods to reduce/compress object DB data on run-time or after close ODB file. Does exist any compress data solution from ObjectDB side? #1 2016-04-29 12:11 Harman company requested to reduce ODB size as much as possible after database created and one of unliked solutio ...

 
forum_thread

Tomcat + JPA Problem

Hi i tried to setup the example from your webpage (jpa - Tomcat with Ecplipse) and i always get this Error: [ObjectDB 2.1.0] class "javax.persistence.Entity"'s signer information does not match signer information of other classes in the same package   #1 2011-03-07 19:06 Hi i tried to setup the example from your webpage (jpa - Tomcat with Ecplipse) and i always get this Error: ...

 
forum_thread

failure to enforce NOT NULL for java.lang.String

my test cases are indicating that @Basic(optional=false) and @Persistent(nullValue=NullValue.EXCEPTION) are not enforced in 2.3.7_08 or that i have failed to understand how to annotate. example: @Entity public class Request {   public Request() { }   @Id @GeneratedValue(strategy=GenerationType.IDENTITY)   private Long id; ... worked well for relationships but not for basic reference types such as String . Build 2.3.7_14 fixes this issue. ...