StDbTableIter.hh

/***************************************************************************
 *
 * $Id: StDbTableIter.hh,v 1.2 2001/01/22 18:38:01 porter Exp $
 *
 * Author: R. Jeff Porter
 ***************************************************************************
 *
 * Description:  Iterates of table-list in a given StDbConfigNode class
 *               Now (Dec2000) just an interface
 *
 ***************************************************************************
 *
 * $Log: StDbTableIter.hh,v $
 * Revision 1.2  2001/01/22 18:38:01  porter
 * Update of code needed in next year running. This update has little
 * effect on the interface (only 1 method has been changed in the interface).
 * Code also preserves backwards compatibility so that old versions of
 * StDbLib can read new table structures.
 *  -Important features:
 *    a. more efficient low-level table structure (see StDbSql.cc)
 *    b. more flexible indexing for new systems (see StDbElememtIndex.cc)
 *    c. environment variable override KEYS for each database
 *    d. StMessage support & clock-time logging diagnostics
 *  -Cosmetic features
 *    e. hid stl behind interfaces (see new *Impl.* files) to again allow rootcint access
 *    f. removed codes that have been obsolete for awhile (e.g. db factories)
 *       & renamed some classes for clarity (e.g. tableQuery became StDataBaseI
 *       and mysqlAccessor became StDbSql)
 *
 * Revision 1.1  2000/01/19 20:20:07  porter
 * - finished transaction model needed by online
 * - fixed CC5 compile problem in StDbNodeInfo.cc
 * - replace TableIter class by StDbTableIter to prevent name problems
 *
 * Revision 1.6  2000/01/10 20:37:55  porter
 * expanded functionality based on planned additions or feedback from Online work.
 * update includes:
 *      1. basis for real transaction model with roll-back
 *      2. limited SQL access via the manager for run-log & tagDb
 *      3. balance obtained between enumerated & string access to databases
 *      4. 3-levels of diagnostic output: Quiet, Normal, Verbose
 *      5. restructured Node model for better XML support
 *
 * Revision 1.5  1999/09/30 02:06:13  porter
 * add StDbTime to better handle timestamps, modify SQL content (mysqlAccessor)
 * allow multiple rows (StDbTable), & Added the comment sections at top of
 * each header and src file
 *
 **************************************************************************/
#ifndef TABLEITR_HH
#define TABLEITR_HH

#include "StDbTable.h"

class StDbTableIter {

public:

  StDbTableIter() {};
  virtual ~StDbTableIter(){};

  virtual StDbTable* next()       = 0;
  virtual StDbTable* operator++() = 0;
  virtual bool done()             = 0;
};


#endif