KVDataBase Class Reference

Detailed Description

Simple cross-referenced database structure.

KVDataBase, along with KVDBKey, KVDBRecord and KVDBTable, are base classes for the implementation of simple cross-referenced database structures. The database is made up of tables with unique names, each table contains a list of records. Records in different tables may be linked together using keys, providing cross-referenced entries.

All these objects are ROOT TFolder objects. The KVDataBase object is added to the ROOT folder and may be browsed in the TBrowser.

           An example of use is given here:

KVDataBase my_db("my_db","Beatles' discography");
 
my_db.AddTable("Albums","All the albums made by The Beatles",kTRUE);
my_db.AddTable("Songs","All the songs written or recorded by The Beatles",kTRUE);
my_db.AddTable("Years","For chronological information",kTRUE);
 
my_db.GetTable("Years")->AddRecord(new KVDBRecord("1966","The Year 1966"));
my_db.GetTable("Years")->AddRecord(new KVDBRecord("1967","The Year 1967"));
my_db.GetTable("Years")->AddRecord(new KVDBRecord("1968","The Year 1968"));
 
my_db.GetTable("Songs")->AddRecord(new KVDBRecord("Taxman","1. Taxman"));
my_db.GetTable("Songs")->AddRecord(new KVDBRecord("Eleanor","2. Eleanor Rigby"));
my_db.GetTable("Songs")->AddRecord(new KVDBRecord("LSD","3. Lucy in the Sky with Diamonds"));
my_db.GetTable("Songs")->AddRecord(new KVDBRecord("Better","4. Getting Better"));
my_db.GetTable("Songs")->AddRecord(new KVDBRecord("USSR","1. Back In The USSR"));
my_db.GetTable("Songs")->AddRecord(new KVDBRecord("Prudence","2. Dear Prudence"));
 
my_db.GetTable("Albums")->AddRecord(new KVDBRecord("Revolver","Revolver"));
my_db.GetTable("Albums")->AddRecord(new KVDBRecord("Pepper","Sgt. Pepper's Lonely Hearts' Club Band"));
my_db.GetTable("Albums")->AddRecord(new KVDBRecord("White","The Beatles"));
 
my_db.GetTable("Albums")->GetRecord("Revolver")->AddKey("Songs","Songs on the album Revolver");
my_db.GetTable("Albums")->GetRecord("Pepper")->AddKey("Songs","Songs on the album Sgt. Pepper");
my_db.GetTable("Albums")->GetRecord("White")->AddKey("Songs","Songs on the album The Beatles");
my_db.GetTable("Albums")->GetRecord("Revolver")->AddLink("Songs",my_db.GetTable("Songs")->GetRecord("Taxman"));
my_db.GetTable("Albums")->GetRecord("Revolver")->AddLink("Songs",my_db.GetTable("Songs")->GetRecord("Eleanor"));
my_db.GetTable("Albums")->GetRecord("Pepper")->AddLink("Songs",my_db.GetTable("Songs")->GetRecord("LSD"));
my_db.GetTable("Albums")->GetRecord("Pepper")->AddLink("Songs",my_db.GetTable("Songs")->GetRecord("Better"));
my_db.GetTable("Albums")->GetRecord("White")->AddLink("Songs",my_db.GetTable("Songs")->GetRecord("USSR"));
my_db.GetTable("Albums")->GetRecord("White")->AddLink("Songs",my_db.GetTable("Songs")->GetRecord("Prudence"));
my_db.GetTable("Years")->GetRecord("1966")->AddKey("Songs","Songs from 1966");
my_db.GetTable("Years")->GetRecord("1967")->AddKey("Songs","Songs from 1967");
my_db.GetTable("Years")->GetRecord("1968")->AddKey("Songs","Songs from 1968");
my_db.GetTable("Years")->GetRecord("1966")->AddLink("Songs",my_db.GetTable("Songs")->GetRecord("Taxman"));
my_db.GetTable("Years")->GetRecord("1966")->AddLink("Songs",my_db.GetTable("Songs")->GetRecord("Eleanor"));
my_db.GetTable("Years")->GetRecord("1967")->AddLink("Songs",my_db.GetTable("Songs")->GetRecord("LSD"));
my_db.GetTable("Years")->GetRecord("1967")->AddLink("Songs",my_db.GetTable("Songs")->GetRecord("Better"));
my_db.GetTable("Years")->GetRecord("1968")->AddLink("Songs",my_db.GetTable("Songs")->GetRecord("USSR"));
my_db.GetTable("Years")->GetRecord("1968")->AddLink("Songs",my_db.GetTable("Songs")->GetRecord("Prudence"));
}

After setting up the database in this way, some typical output would be:

root [12] my_db.Print()
_______________________________________________________
my_db Beatles' discography
Available Tables :
  Albums
  Songs
  Years
_______________________________________________________
 
root [14] my_db.GetTable("Songs")->ls()
OBJ: KVDBRecord Taxman  1. Taxman : 0 at: 0x89b5910
OBJ: KVDBRecord Eleanor 2. Eleanor Rigby : 0 at: 0x89acb50
OBJ: KVDBRecord LSD     3. Lucy in the Sky with Diamonds : 0 at: 0x89b59f0
OBJ: KVDBRecord Better  4. Getting Better : 0 at: 0x89b5c08
OBJ: KVDBRecord USSR    1. Back In The USSR : 0 at: 0x89b5c40
OBJ: KVDBRecord Prudence        2. Dear Prudence : 0 at: 0x89b5cd8
 
root [15] my_db.GetTable("Albums")->GetRecord("White")->Print()
_______________________________________________________
White The Beatles
Available Keys :
  Songs
_______________________________________________________
 
root [16] my_db.GetTable("Songs")->GetRecord("LSD")->Print()
_______________________________________________________
LSD 3. Lucy in the Sky with Diamonds
Available Keys :
  Albums
  Years
_______________________________________________________
 
root [18] my_db.GetTable("Songs")->GetRecord("LSD")->GetKey("Albums")->ls()
OBJ: KVDBRecord Pepper  Sgt. Pepper's Lonely Hearts' Club Band : 0 at: 0x89b5b00
 
root [19] my_db.GetTable("Songs")->GetRecord("LSD")->GetKey("Years")->ls()
OBJ: KVDBRecord 1967    The Year 1967 : 0 at: 0x89b57a0

Definition at line 137 of file KVDataBase.h.

#include <KVDataBase.h>

Inheritance diagram for KVDataBase:

Public Member Functions
	KVDataBase ()
	KVDataBase (const Char_t *name)
	KVDataBase (const Char_t *name, const Char_t *title)
virtual	~ KVDataBase ()
virtual KVDBTable *	AddTable (const Char_t *name, const Char_t *title, Bool_t unique=kFALSE)
virtual Bool_t	AddTable (KVDBTable *table)
virtual KVDBRecord *	GetRecord (const Char_t *table_name, const Char_t *rec_name) const
virtual KVDBTable *	GetTable (const Char_t *table) const
virtual TList *	GetTables () const
virtual void	Print (Option_t *option="") const
Public Member Functions inherited from TFolder
	TFolder ()
	TFolder (const char *name, const char *title)
virtual	~TFolder ()
virtual void	Add (TObject *obj)
TFolder *	AddFolder (const char *name, const char *title, TCollection *collection=nullptr)
void	Browse (TBrowser *b) override
void	Clear (Option_t *option="") override
void	Copy (TObject &) const override
virtual const char *	FindFullPathName (const char *name) const
virtual const char *	FindFullPathName (const TObject *obj) const
TObject *	FindObject (const char *name) const override
TObject *	FindObject (const TObject *obj) const override
virtual TObject *	FindObjectAny (const char *name) const
TCollection *	GetListOfFolders () const
TClass *	IsA () const override
Bool_t	IsFolder () const override
Bool_t	IsOwner () const
void	ls (Option_t *option="") const override
virtual Int_t	Occurence (const TObject *obj) const
void	RecursiveRemove (TObject *obj) override
virtual void	Remove (TObject *obj)
void	SaveAs (const char *filename="", Option_t *option="") const override
virtual void	SetOwner (Bool_t owner=kTRUE)
void	Streamer (TBuffer &) override
void	StreamerNVirtual (TBuffer &ClassDef_StreamerNVirtual_b)
Public Member Functions inherited from TNamed
	TNamed ()
	TNamed (const char *name, const char *title)
	TNamed (const TNamed &named)
	TNamed (const TString &name, const TString &title)
virtual	~TNamed ()
void	Clear (Option_t *option="") override
TObject *	Clone (const char *newname="") const override
Int_t	Compare (const TObject *obj) const override
void	Copy (TObject &named) const override
virtual void	FillBuffer (char *&buffer)
const char *	GetName () const override
const char *	GetTitle () const override
ULong_t	Hash () const override
TClass *	IsA () const override
Bool_t	IsSortable () const override
void	ls (Option_t *option="") const override
TNamed &	operator= (const TNamed &rhs)
virtual void	SetName (const char *name)
virtual void	SetNameTitle (const char *name, const char *title)
virtual void	SetTitle (const char *title="")
virtual Int_t	Sizeof () const
void	Streamer (TBuffer &) override
void	StreamerNVirtual (TBuffer &ClassDef_StreamerNVirtual_b)
Public Member Functions inherited from TObject
	TObject ()
	TObject (const TObject &object)
virtual	~TObject ()
void	AbstractMethod (const char *method) const
virtual void	AppendPad (Option_t *option="")
ULong_t	CheckedHash ()
virtual const char *	ClassName () const
virtual void	Delete (Option_t *option="")
virtual Int_t	DistancetoPrimitive (Int_t px, Int_t py)
virtual void	Draw (Option_t *option="")
virtual void	DrawClass () const
virtual TObject *	DrawClone (Option_t *option="") const
virtual void	Dump () const
virtual void	Error (const char *method, const char *msgfmt,...) const
virtual void	Execute (const char *method, const char *params, Int_t *error=nullptr)
virtual void	Execute (TMethod *method, TObjArray *params, Int_t *error=nullptr)
virtual void	ExecuteEvent (Int_t event, Int_t px, Int_t py)
virtual void	Fatal (const char *method, const char *msgfmt,...) const
virtual Option_t *	GetDrawOption () const
virtual const char *	GetIconName () const
virtual char *	GetObjectInfo (Int_t px, Int_t py) const
virtual Option_t *	GetOption () const
virtual UInt_t	GetUniqueID () const
virtual Bool_t	HandleTimer (TTimer *timer)
Bool_t	HasInconsistentHash () const
virtual void	Info (const char *method, const char *msgfmt,...) const
virtual Bool_t	InheritsFrom (const char *classname) const
virtual Bool_t	InheritsFrom (const TClass *cl) const
virtual void	Inspect () const
void	InvertBit (UInt_t f)
Bool_t	IsDestructed () const
virtual Bool_t	IsEqual (const TObject *obj) const
R__ALWAYS_INLINE Bool_t	IsOnHeap () const
R__ALWAYS_INLINE Bool_t	IsZombie () const
void	MayNotUse (const char *method) const
virtual Bool_t	Notify ()
void	Obsolete (const char *method, const char *asOfVers, const char *removedFromVers) const
void	operator delete (void *ptr)
void	operator delete (void *ptr, void *vp)
void	operator delete[] (void *ptr)
void	operator delete[] (void *ptr, void *vp)
void *	operator new (size_t sz)
void *	operator new (size_t sz, void *vp)
void *	operator new[] (size_t sz)
void *	operator new[] (size_t sz, void *vp)
TObject &	operator= (const TObject &rhs)
virtual void	Paint (Option_t *option="")
virtual void	Pop ()
virtual Int_t	Read (const char *name)
void	ResetBit (UInt_t f)
virtual void	SavePrimitive (std::ostream &out, Option_t *option="")
void	SetBit (UInt_t f)
void	SetBit (UInt_t f, Bool_t set)
virtual void	SetDrawOption (Option_t *option="")
virtual void	SetUniqueID (UInt_t uid)
void	StreamerNVirtual (TBuffer &ClassDef_StreamerNVirtual_b)
virtual void	SysError (const char *method, const char *msgfmt,...) const
R__ALWAYS_INLINE Bool_t	TestBit (UInt_t f) const
Int_t	TestBits (UInt_t f) const
virtual void	UseCurrentStyle ()
virtual void	Warning (const char *method, const char *msgfmt,...) const
virtual Int_t	Write (const char *name=nullptr, Int_t option=0, Int_t bufsize=0)
virtual Int_t	Write (const char *name=nullptr, Int_t option=0, Int_t bufsize=0) const

Private Attributes
TString	fFolderName

Additional Inherited Members
Public Types inherited from TObject
enum	EDeprecatedStatusBits
enum	EStatusBits
Static Public Member Functions inherited from TFolder
static TClass *	Class ()
static const char *	Class_Name ()
static constexpr Version_t	Class_Version ()
static const char *	DeclFileName ()
Static Public Member Functions inherited from TNamed
static TClass *	Class ()
static const char *	Class_Name ()
static constexpr Version_t	Class_Version ()
static const char *	DeclFileName ()
Static Public Member Functions inherited from TObject
static TClass *	Class ()
static const char *	Class_Name ()
static constexpr Version_t	Class_Version ()
static const char *	DeclFileName ()
static Longptr_t	GetDtorOnly ()
static Bool_t	GetObjectStat ()
static void	SetDtorOnly (void *obj)
static void	SetObjectStat (Bool_t stat)
Public Attributes inherited from TObject
	kBitMask
	kCanDelete
	kCannotPick
	kHasUUID
	kInconsistent
	kInvalidObject
	kIsOnHeap
	kIsReferenced
	kMustCleanup
	kNoContextMenu
	kNotDeleted
	kObjInCanvas
	kOverwrite
	kSingleKey
	kWriteDelete
	kZombie
Protected Member Functions inherited from TObject
virtual void	DoError (int level, const char *location, const char *fmt, va_list va) const
void	MakeZombie ()
Protected Attributes inherited from TFolder
TCollection *	fFolders
Bool_t	fIsOwner
Protected Attributes inherited from TNamed
TString	fName
TString	fTitle
Protected Attributes inherited from TObject
	kOnlyPrepStep

Constructor & Destructor Documentation

KVDataBase() [1/3]

KVDataBase::KVDataBase

(

)

Definition at line 31 of file KVDataBase.cpp.

KVDataBase() [2/3]

KVDataBase::KVDataBase

(

const Char_t *

name

)

Definition at line 53 of file KVDataBase.cpp.

KVDataBase() [3/3]

KVDataBase::KVDataBase	(	const Char_t *	name,
		const Char_t *	title
	)

Definition at line 41 of file KVDataBase.cpp.

~ KVDataBase()

virtual KVDataBase::~ KVDataBase ( )

virtual

Member Function Documentation

AddTable() [1/2]

KVDBTable * KVDataBase::AddTable ( const Char_t *  name, const Char_t *  title, Bool_t  unique = kFALSE  )

virtual

Add a table to the list of tables and check if the new table's name already exists. If it exists the table is not added and null pointer is returned, otherwise a new table is created and added to the list and its address is returned. Table with this name already in DB ?

Definition at line 109 of file KVDataBase.cpp.

AddTable() [2/2]

Bool_t KVDataBase::AddTable ( KVDBTable *  tab )

virtual

Add a table to the list of available tables and return kTRUE it's added. As each table must have a unique name we check if the new table's name already exists, if not the table is added otherwise it's not added and the method return kFALSE.

table with this name already in DB ?

Definition at line 84 of file KVDataBase.cpp.

GetRecord()

KVDBRecord * KVDataBase::GetRecord ( const Char_t *  table_name, const Char_t *  rec_name  ) const

virtual

Return the KVDBRecord rec_name found in the table table_name

Definition at line 133 of file KVDataBase.cpp.

GetTable()

KVDBTable * KVDataBase::GetTable ( const Char_t *  table ) const

inlinevirtual

Definition at line 159 of file KVDataBase.h.

GetTables()

TList * KVDataBase::GetTables ( ) const

inlinevirtual

Definition at line 164 of file KVDataBase.h.

Print()

void KVDataBase::Print ( Option_t *  option = "" ) const

virtual

Reimplemented from TNamed.

Definition at line 152 of file KVDataBase.cpp.

Member Data Documentation

fFolderName

TString KVDataBase::fFolderName

private

Definition at line 139 of file KVDataBase.h.