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Infrastructure Access to Database Data. Database Categories & Consumers Data Access Framework Offline Access Model Development Tasks R. Jeff Porter 2/1/99 STAR Collaboration Meeting. Database Categories & Consumers. DB-Type DB-Consumer DB-store MessageLog Online ASCII

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Infrastructure access to database data

Infrastructure Access to Database Data

Database Categories & Consumers

Data Access Framework

Offline Access Model

Development Tasks

R. Jeff Porter 2/1/99 STAR Collaboration Meeting


Database categories consumers
Database Categories & Consumers

DB-TypeDB-ConsumerDB-store

MessageLog Online ASCII

RunLog Online+Offline Objy & ASCII

Configurations/DB Online Objy & ASCII

Conditions/DB Online+Offline Objy

Scalers Offline Objy

Event Tags (TagDB) Offline Objy + Root

Calibrations Offline Objy & ASCII

Geometry Offline Objy & ASCII



Db access considerations
DB Access Considerations

  • Primary Repository >> Objectivity

  • Objectivity will not be exposed to (consumer) codes

  • Online & Offline Infrastructures differ

    Offline >> StRoot framework

    Online >> C++ & CORBA (no Root I/O)

  • Online & Offline require use of an ASCII Repository

    - editor-friendly format for filling DB data

    - backup while Objectivity/DB is being developed

    - test bed for non-Objectivity code development



Access model for offline
Access Model for Offline

StMaker & St_DataSet form basis for Offline Infrastructure

St_db_Maker (Victor)

  • Reads RootCINT Macro store of data into St_DataSet’s transient tree

  • St_Table: inherits from St_DataSet & contains “Char_t* s_table”

  • St_[staf_table] inherits from St_Table & supports return [staf_table]*

    St_Odb_Maker

  • Calls Database Access code (database factory) & recieves StDbObject for input into St_DataSet’s transient tree.

  • St_DBSet: inherits from St_DataSet & contains “StDbObject* s_db”

  • St_[dbo] inherits from St_DBSet & supports return [dbo_UI]*


Babar conditions db api
BaBar Conditions DB API

Data Access

  • BdbDatabase->store( ObjH, indexContainer, beginTime, [endTime],...)

  • BdbDatabase->fetch( ObjH, indexContainer, theTime,...)


Access from conditions db
Access from Conditions DB

Objectivity Data Access

StDbObject* dbo = StDbFactory->GetDBInfo( NamedObject, theTime,...)

  • Deconvolutes NamedObject into specific Objectivity Objects: ObjH1, ObjH2,…

  • Retrieves Objectivity data

    • BdbDatabase->fetch(ObjH1,indexContainer, theTime,...)

    • BdbDatabase->fetch(ObjH2,indexContainer, theTime,...) …

  • Makes Transient Data from Objectivity data

    • StDbObject->setData(ObjH1->getData())

    • StDbObject->setData(ObjH2->getData())

  • Returns Transient Data StDbObject

    Transient tree structure is not part of persistent data

    Returned StDbObject supports UserInterface


Technical issues
Technical Issues

Platform Dependencies

  • Objectivity: Solaris, Win-95/NT, Linux, HP-UX, AIX, IRIX, DEC-Unix

  • BaBar-Objectivity: Solaris, HP-UX, AIX, DEC-Unix

  • STAR Offline: Solaris, Linux

  • Use of Objectivity Database will Not be fully exercised in MDC2 but restricted to testing on Solaris machines


  • Development tasks
    Development Tasks

    Tasks beyond Objectivity Database storage

    • Finish design & implement Offline access to Objectivity

    • Use current TPC DB-data as prototype for other domains

    • Design standardized Database input formats

    • develop Database-data viewers

      Needed Tutorials for Offline DataBase Users

    • Access to DB data with Offline Infrastructure

    • Database Developers Workshop


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