////////////////////////////////////////////////////////////
//
// BrRunsDb is a Db class which manages BrRun's with information
// extracted from the BRAHMS run database. It connects to the 
// BRAHMS run database via the TSQLServer.  There are several 
// ways for runs to be selected.  A single run can be selected
// using BrRunsDb::SelectRun(irun) where irun is the run to be 
// selected.  Another way to select a group of runs is to use
// BrRunsDb::SelectRuns(time1,time2) where time1,2 are TDatime
// objects specifying time intervals for a list of runs to be 
// selected.
//
// To get the runs, use BrRunsDb::GetRun(isel) which returns
// a BrRun object which was built in the SelectRun or SelectRuns
// methods.
//
// Example:
//     BrRunsDb *runDb = new BrRunsDb("mysql://pii3.brahms.bnl.gov/RUNDB",
//                                    "query","query-only");
//     BrDbRun *run = runDb->GetRun("1554");
//
//     run now contains all of the information in the run DB
//     extracted from run 1554.
//
//     Alternatively, one can use:
//     TDatime time1(2000,6,27,0,0,0);
//     TDatime time2(2000,6,28,0,0,0);
//     TObjArray *runList = runDb->SelectRuns(Form("StartTime > %d and EndTime < %d",time1.Convert(),time2.Convert()));  //select all runs of 6/27/00
//
//     Then to use them, use:
//     Int_t numruns = runList->GetEntries();
//     for(isel=0;isel<numruns;isel++) {
//        BrRun *run = (BrRun*)runList->At(isel);
//              .
//              .
//              .
//           process this run
//              .
//              .
//              .
//        }
//
////////////////////////////////////////////////////////////

// $Id: BrRunsDb.cxx,v 1.2 2001/10/08 11:02:42 cholm Exp $
// $Author: cholm $
// $Date: 2001/10/08 11:02:42 $
// $Copyright: 2000 Brahms Collaboration

#ifndef __FSTREAM__
#include <fstream>
#endif
#ifndef ROOT_TDatime
#include "TDatime.h"
#endif
#ifndef BRAT_BrRunsDb
#include "BrRunsDb.h"
#endif
#ifndef BRAT_BrException
#include "BrException.h"
#endif
#ifndef BRAT_BrRdbmRunsDb
#include "BrRdbmRunsDb.h"
#endif
#ifndef __CSTDLIB__
#include <cstdlib>
#endif
#ifndef __IOSTREAM__
#include <iostream>
#endif

//____________________________________________________________________
ClassImp(BrRunsDb);
 
//____________________________________________________________________
BrRunsDb* BrRunsDb::fgInstance = 0;

//____________________________________________________________________
BrRunsDb::BrRunsDb()
{
  // Normal constructor. Singleton. 
}

//____________________________________________________________________
 BrRunsDb::~BrRunsDb() 
{
  // Empty DTOR
}

//____________________________________________________________________
 BrRunsDb* BrRunsDb::Instance(void) 
{
  if (!fgInstance) 
    fgInstance = new BrRdbmRunsDb("","RUNDB");
  return fgInstance;
}

// EOF

Copyright ; 2002 BRAHMS Collaboration <brahmlib@rcf.rhic.bnl.gov>
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