[Objectbridge-developers] new release 0.1.63

[Thomas M. <tho...@ho...>]

Dear OJB enthusiasts,

I just assembled a new release. It brings two major enhancements:
1. A Query facility in package ojb.broker.query. It is based on the
   COBRA query facility. But provides some enhancements, e.g.
Query-By-Examples.
   You will find sample code using the new API in
test.ojb.broker.PersistenceBrokerTest.
   Joins are not supported right now... ...still a long way to OQL...

2. A re-implementation of the named roots-map (NRM). relies on Davids
last changes to 
   transaction management. The NRM is implemented as a set of
Entry-objects mapped to
   a table in a RDBMS. This allows to apply the same transactional
mechanisms
   as for other persistence-capable objects.
   This is also a first step towards an implementation of persistent
Collections which
   will be implemented in a similar style.



From the release notes:
New features:
- Query facility in the PersistenceBroker, allows queries by example
  and queries by filter criteria. In this release joins are not
supported.
  I'm planning to use this query facility as a backend to the OQL
  implementation.
- New TestClass test.ojb.broker.PerformanceTest allows profiling to
detect
  performance critical operations. try "build performance".
 

changes, refactorings
- reimplemented the Named Roots Map as a persistent Collection.
  It is now complety integrated in the transaction mechanism.
- changed the PersistenceBroker interface to reflect the usage of
  Query objects. changed all examples accordingly.
- All PersistenceBroker Object are now declared as "throws
PersistenceBrokerException"
- faster implementation of
ojb.broker.metadata.ClassDescriptor::getFieldDescriptorByIndex(int)

bug fixes
- prepared statement generation for String attributes in SQLGenerator

Open bugs:
- The testmethod testWrongDbName in test.ojb.odmg.OdmgExamples still
reports a failure.
  
enJoy,

Thomas