TKeySQL.h

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// @(#)root/sql:$Id$
// Author: Sergey Linev  20/11/2005

/*************************************************************************
 * Copyright (C) 1995-2005, Rene Brun and Fons Rademakers.               *
 * All rights reserved.                                                  *
 *                                                                       *
 * For the licensing terms see $ROOTSYS/LICENSE.                         *
 * For the list of contributors see $ROOTSYS/README/CREDITS.             *
 *************************************************************************/

#ifndef ROOT_TKeySQL
#define ROOT_TKeySQL

#include "TKey.h"

class TSQLFile;

class TKeySQL : public TKey {

private:
   TKeySQL(const TKeySQL &);            // TKeySQL objects are not copiable.
   TKeySQL &operator=(const TKeySQL &); // TKeySQL objects are not copiable.

protected:
   TKeySQL();

   virtual Int_t Read(const char *name) { return TKey::Read(name); }
   void StoreKeyObject(const void *obj, const TClass *cl);
   void *ReadKeyObject(void *obj, const TClass *expectedClass);

   Long64_t fKeyId; ///<!  key identifier in KeysTables
   Long64_t fObjId; ///<!  stored object identifer

public:
   TKeySQL(TDirectory *mother, const TObject *obj, const char *name, const char *title = 0);
   TKeySQL(TDirectory *mother, const void *obj, const TClass *cl, const char *name, const char *title = 0);
   TKeySQL(TDirectory *mother, Long64_t keyid, Long64_t objid, const char *name, const char *title,
           const char *keydatetime, Int_t cycle, const char *classname);
   virtual ~TKeySQL();

   Bool_t
   IsKeyModified(const char *keyname, const char *keytitle, const char *keydatime, Int_t cycle, const char *classname);

   Long64_t GetDBKeyId() const { return fKeyId; }
   Long64_t GetDBObjId() const { return fObjId; }
   Long64_t GetDBDirId() const;

   // redefined TKey Methods
   virtual void Delete(Option_t *option = "");
   virtual void DeleteBuffer() {}
   virtual void FillBuffer(char *&) {}
   virtual char *GetBuffer() const { return 0; }
   virtual Long64_t GetSeekKey() const { return GetDBObjId() > 0 ? GetDBObjId() : 0; }
   virtual Long64_t GetSeekPdir() const { return GetDBDirId() > 0 ? GetDBDirId() : 0; }
   virtual void Keep() {}

   virtual Int_t Read(TObject *obj);
   virtual TObject *ReadObj();
   virtual TObject *ReadObjWithBuffer(char *bufferRead);
   virtual void *ReadObjectAny(const TClass *expectedClass);

   virtual void ReadBuffer(char *&) {}
   virtual Bool_t ReadFile() { return kTRUE; }
   virtual void SetBuffer() { fBuffer = 0; }
   virtual Int_t WriteFile(Int_t = 1, TFile * = 0) { return 0; }

   ClassDef(TKeySQL, 1) // a special TKey for SQL data base
};

#endif