Access an SQL db via the TFile interface.

The main motivation for the TSQLFile development is to have "transparent" access to SQL data base via standard TFile interface. The main approach that each class (but not each object) has one or two tables with names like _ver$(VERSION) and _raw$(VERSION) For example: TAxis_ver8 or TList_raw5 Second kind of tables appears, when some of class members can not be converted to normalized form or when class has custom streamer. For instance, for TH1 class two tables are required: TH1_ver4 and TH1_raw4 Most of members are stored in TH1_ver4 table column-wise, and only member: Double_t* fBuffer; //[fBufferSize] can not be represented as column while size of array is not fixed. Therefore, fBuffer will be written as list of values in TH1_raw4 table. All objects, stored in the DB, will be registered in table "ObjectsTable". In this there are following columns:

Name	Description
"key:id"	key identifier to which belong object
"obj:id"	object identifier
"Class"	object class name
"Version"	object class version

Data in each "ObjectsTable" row uniquely identify, in which table and which column object is stored.

In normal situation all class data should be sorted column-wise. Up to now following member are supported:

Basic data types. Here is everything clear. Column SQL type will be as much as possible close to the original type of value.
Fixed array of basic data types. In this case n columns like fArr[0], fArr[1] and so on will be created. If there is multidimensional array, names will be fArr2[1][2][1] and so on
Parent class. In this case version of parent class is stored and data of parent class will be stored with the same obj:id in correspondent table. There is a special case, when parent store nothing (this is for instance TQObject). In that case just -1 is written to avoid any extra checks if table exist or not.
Object as data member. In that case object is saved in normal way to data base and column will contain id of this object.
Pointer on object. Same as before. In case if object was already stored, just its id will be placed in the column. For NULL pointer 0 is used.
TString. Now column with limited width like VARCAHR(255) in MySQL is used. Later this will be improved to support maximum possible strings
Anything else. Data will be converted to raw format and saved in streamer table. Each row supplied with obj:id and row:id, where row:id indicates data, corresponding to this particular data member, and column will contain this raw:id

All conversion to SQL statements are done with help of TSQLStructure class. This is special hierarchical structure wich internally is very similar to XML structures. TBufferSQL2 creates these structures, when object data is streamed by ROOT and only afterwards all SQL statements will be produced and applied all together. When data is reading, TBufferSQL2 will produce requests to database during unstreaming of object data. Optionally (default this options on) name of column includes suffix which indicates type of column. For instance:

Name	Description
*:parent	parent class, column contain class version
*:object	other object, column contain object id
*:rawdata	raw data, column contains id of raw data from streamer table
*:Int_t	column with integer value

Use TSQLFile::SetUseSuffixes(kFALSE) to disable suffixes usage. This and several other options can be changed only when TSQLFile created with options "CREATE" or "RECREATE" and only before first write operation. These options are:

Name	Description
SetUseSuffixes()	suffix usage in column names (default - on)
SetArrayLimit()	defines maximum array size, which can has column for each element (default 21)
SetTablesType()	table type name in MySQL database (default "InnoDB")
SetUseIndexes()	usage of indexes in database (default kIndexesBasic)

Normally these functions should be called immediately after TSQLFile constructor. When objects data written to database, by default START TRANSACTION/COMMIT SQL commands are used before and after data storage. If TSQLFile detects any problems, ROLLBACK command will be used to restore previous state of data base. If transactions not supported by SQL server, they can be disabled by SetUseTransactions(kTransactionsOff). Or user can take responsibility to use transactions function himself. By default only indexes for basic tables are created. In most cases usage of indexes increase performance to data reading, but it also can increase time of writing data to database. There are several modes of index usage available in SetUseIndexes() method There is MakeSelectQuery(TClass*) method, which produces SELECT statement to get objects data of specified class. Difference from simple statement like: mysql> SELECT * FROM TH1I_ver1 that not only data for that class, but also data from parent classes will be extracted from other tables and combined in single result table. Such select query can be useful for external access to objects data.

Up to now MySQL 4.1 and Oracle 9i were tested. Some extra work is required for other SQL databases. Hopefully, this should be straightforward.

Known problems and open questions.

TTree is not supported by TSQLFile. There is independent development of TTreeSQL class, which allows to store trees directly in SQL database
TClonesArray is store objects in raw format, which can not be accessed outside ROOT. This will be changed later.
TDirectory cannot work. Hopefully, will (changes in ROOT basic I/O is required)
Streamer infos are not written to file, therefore schema evolution is not yet supported. All eforts are done to enable this feature in the near future

Example how TSQLFile can be used

A session saving data to a SQL data base

auto dbname = "mysql://host.domain:3306/dbname";
auto username = "username";
auto userpass = "userpass";
 
// Clean data base and create primary tables
auto f = new TSQLFile(dbname, "recreate", username, userpass);
// Write with standard I/O functions
arr->Write("arr", TObject::kSingleKey);
h1->Write("histo");
// Close connection to DB
delete f;

A session read data from SQL data base

// Open database again in read-only mode
auto f = new TSQLFile(dbname, "open", username, userpass);
// Show list of keys
f->ls();
// Read stored object, again standard ROOT I/O
auto h1 = (TH1*) f->Get("histo");
if (h1!=0) { h1->SetDirectory(0); h1->Draw(); }
auto obj = f->Get("arr");
if (obj!=0) obj->Print("*");
// close connection to DB
delete f;

The "SQL I/O" package is currently under development. Any bug reports and suggestions are welcome. Author: S.Linev, GSI Darmstadt, S.Lin.nosp@m.ev@g.nosp@m.si.de

Definition at line 30 of file TSQLFile.h.

Public Types
enum	EIndexesKinds { kIndexesNone = 0 , kIndexesBasic = 1 , kIndexesClass = 2 , kIndexesAll = 3 }

enum	ETransactionKinds { kTransactionsOff = 0 , kTransactionsAuto = 1 , kTransactionsUser = 2 }

Public Types inherited from TFile
enum	{ kStartBigFile = 2000000000 }

enum	EAsyncOpenStatus { kAOSNotAsync = -1 , kAOSFailure = 0 , kAOSInProgress = 1 , kAOSSuccess = 2 }
	Asynchronous open request status. More...

enum	ECacheAction { kDisconnect = 0 , kDoNotDisconnect = 1 }
	TTreeCache flushing semantics. More...

enum	EFileType { kDefault = 0 , kLocal = 1 , kNet = 2 , kWeb = 3 , kFile = 4 , kMerge = 5 }
	File type. More...

enum	EOpenTimeOut { kInstantTimeout = 0 , kEternalTimeout = 999999999 }
	Open timeout constants. More...

enum	ERelativeTo { kBeg = 0 , kCur = 1 , kEnd = 2 }

enum	EStatusBits { k630forwardCompatibility = (1ULL << ( 2 )) , kRecovered = (1ULL << ( 10 )) , kHasReferences = (1ULL << ( 11 )) , kDevNull = (1ULL << ( 12 )) , kWriteError = (1ULL << ( 14 )) , kBinaryFile = (1ULL << ( 15 )) , kRedirected = (1ULL << ( 16 )) , kReproducible = (1ULL << ( 17 )) }
	TFile status bits. BIT(13) is taken up by TObject. More...

Public Types inherited from TDirectoryFile
enum	EStatusBits { kCloseDirectory = (1ULL << ( 7 )) }

Public Types inherited from TObject
enum	{ kIsOnHeap = 0x01000000 , kNotDeleted = 0x02000000 , kZombie = 0x04000000 , kInconsistent = 0x08000000 , kBitMask = 0x00ffffff }

enum	{ kSingleKey = (1ULL << ( 0 )) , kOverwrite = (1ULL << ( 1 )) , kWriteDelete = (1ULL << ( 2 )) }

enum	EDeprecatedStatusBits { kObjInCanvas = (1ULL << ( 3 )) }

enum	EStatusBits { kCanDelete = (1ULL << ( 0 )) , kMustCleanup = (1ULL << ( 3 )) , kIsReferenced = (1ULL << ( 4 )) , kHasUUID = (1ULL << ( 5 )) , kCannotPick = (1ULL << ( 6 )) , kNoContextMenu = (1ULL << ( 8 )) , kInvalidObject = (1ULL << ( 13 )) }

Public Member Functions
	TSQLFile ()
	default TSQLFile constructor

	TSQLFile (const char dbname, Option_t option="read", const char user="user", const char pass="pass")
	Connects to SQL server with provided arguments.

	~TSQLFile () override
	destructor of TSQLFile object

void	Close (Option_t *option="") final
	Close a SQL file For more comments see TFile::Close() function.

Bool_t	Commit ()
	Commit transaction, started by StartTransaction() call.

TKey *	CreateKey (TDirectory mother, const TObject obj, const char *name, Int_t bufsize) final
	create SQL key, which will store object in data base

TKey *	CreateKey (TDirectory mother, const void obj, const TClass cl, const char name, Int_t bufsize) final
	create SQL key, which will store object in data base

void	DrawMap (const char ="", Option_t *="") final
	Draw map of objects in this file.

void	FillBuffer (char *&) final
	Encode file output buffer.

void	Flush () final
	Synchronize a file's in-memory and on-disk states.

Int_t	GetArrayLimit () const

const char *	GetDataBaseName () const
	Return name of data base on the host For Oracle always return 0.

Long64_t	GetEND () const final

Int_t	GetErrno () const final
	Method returning errno.

Int_t	GetIOVersion () const

Int_t	GetNbytesFree () const final

Int_t	GetNbytesInfo () const final

Int_t	GetNfree () const final

Int_t	GetQuerisCounter () const

Long64_t	GetSeekFree () const final

Long64_t	GetSeekInfo () const final

Long64_t	GetSize () const final
	Returns the current file size.

const char *	GetTablesType () const

Int_t	GetUseIndexes () const

Bool_t	GetUseSuffixes () const

Int_t	GetUseTransactions () const

TClass *	IsA () const override

Bool_t	IsMySQL () const
	checks, if MySQL database

Bool_t	IsODBC () const
	checks, if ODBC driver used for database connection

Bool_t	IsOpen () const final
	return kTRUE if file is opened and can be accessed

Bool_t	IsOracle () const
	checks, if Oracle database

void	MakeFree (Long64_t, Long64_t) final
	Mark unused bytes on the file.

void	MakeProject (const char , const char ="", Option_t ="new") final
	Generate source code necessary to access the objects stored in the file.

TString	MakeSelectQuery (TClass *cl)
	Produce SELECT statement which can be used to get all data of class cl in one SELECT statement.

void	Map () final

void	Map (Option_t *) final
	List the contents of a file sequentially.

void	Paint (Option_t *="") final
	Paint all objects in the file.

void	Print (Option_t *="") const final
	Print all objects in the file.

Bool_t	ReadBuffer (char *, Int_t) final
	Read a buffer from the file.

Bool_t	ReadBuffer (char *, Long64_t, Int_t) final
	Read a buffer from the file at the offset 'pos' in the file.

void	ReadFree () final
	Read the FREE linked list.

Int_t	Recover () final
	Attempt to recover file if not correctly closed.

Int_t	ReOpen (Option_t *mode) final
	Reopen a file with a different access mode, like from READ to See TFile::Open() for details.

void	ResetErrno () const final
	Method resetting the errno.

Bool_t	Rollback ()
	Rollback all operations, done after StartTransaction() call.

void	Seek (Long64_t, ERelativeTo=kBeg) final
	Seek to a specific position in the file. Pos it either kBeg, kCur or kEnd.

void	SetArrayLimit (Int_t limit=20)
	Defines maximum number of columns for array representation If array size bigger than limit, array data will be converted to raw format This is usefull to prevent tables with very big number of columns If limit==0, all arrays will be stored in raw format If limit<0, all array values will be stored in column form Default value is 21.

void	SetEND (Long64_t) final

void	SetTablesType (const char *table_type)
	Defines tables type, which is used in CREATE TABLE statements Now is only used for MySQL database, where following types are supported: "BDB", "HEAP", "ISAM", "InnoDB", "MERGE", "MRG_MYISAM", "MYISAM" Default for TSQLFile is "InnoDB".

void	SetUseIndexes (Int_t use_type=kIndexesBasic)
	Specify usage of indexes for data tables.

void	SetUseSuffixes (Bool_t on=kTRUE)
	enable/disable uasge of suffixes in columns names can be changed before first object is saved into file

void	SetUseTransactions (Int_t mode=kTransactionsAuto)
	Defines usage of transactions statements for writing objects data to database.

Int_t	Sizeof () const final
	Return the size in bytes of the file header.

void	SkipArrayLimit ()

void	StartLogFile (const char *fname)
	start logging of all SQL statements in specified file

Bool_t	StartTransaction ()
	Start user transaction.

void	StopLogFile ()
	close logging file

void	Streamer (TBuffer &) override
	Streamer for TSQLFile class.

void	StreamerNVirtual (TBuffer &ClassDef_StreamerNVirtual_b)

Int_t	Write (const char *=nullptr, Int_t=0, Int_t=0) const final
	One can not save a const TDirectory object.

Int_t	Write (const char *=nullptr, Int_t=0, Int_t=0) final
	Write memory objects to this file.

Bool_t	WriteBuffer (const char *, Int_t) final
	Write a buffer to the file.

void	WriteFree () final
	Write FREE linked list on the file.

void	WriteHeader () final
	Write file info like configurations, title, UUID and other.

void	WriteStreamerInfo () final
	Store all TVirtualStreamerInfo, used in file, in sql database.

Public Member Functions inherited from TFile
	TFile ()
	File default Constructor.

	TFile (const char fname, Option_t option="", const char *ftitle="", Int_t compress=ROOT::RCompressionSetting::EDefaults::kUseCompiledDefault)
	Opens or creates a local ROOT file.

	~TFile () override
	File destructor.

void	Copy (TObject &) const override
	Copy this to obj.

virtual Bool_t	Cp (const char *dst, Bool_t progressbar=kTRUE, UInt_t buffersize=1000000)
	Allows to copy this file to the dst URL.

void	Delete (const char *namecycle="") override
	Delete object namecycle.

void	Draw (Option_t *option="") override
	Fill Graphics Structure and Paint.

TArchiveFile *	GetArchive () const

Long64_t	GetArchiveOffset () const

Int_t	GetBestBuffer () const
	Return the best buffer size of objects on this file.

virtual Long64_t	GetBytesRead () const

virtual Long64_t	GetBytesReadExtra () const

virtual Int_t	GetBytesToPrefetch () const
	Max number of bytes to prefetch.

virtual Long64_t	GetBytesWritten () const
	Return the total number of bytes written so far to the file.

TFileCacheRead *	GetCacheRead (const TObject *tree=nullptr) const
	Return a pointer to the current read cache.

TFileCacheWrite *	GetCacheWrite () const
	Return a pointer to the current write cache.

TArrayC *	GetClassIndex () const

Int_t	GetCompressionAlgorithm () const

Float_t	GetCompressionFactor ()
	Return the file compression factor.

Int_t	GetCompressionLevel () const

Int_t	GetCompressionSettings () const

virtual const TUrl *	GetEndpointUrl () const

Int_t	GetFd () const

TList *	GetListOfFree () const

TObjArray *	GetListOfProcessIDs () const

virtual TString	GetNewUrl ()

virtual Int_t	GetNProcessIDs () const

Option_t *	GetOption () const override

virtual Int_t	GetReadCalls () const

Int_t	GetRecordHeader (char *buf, Long64_t first, Int_t maxbytes, Int_t &nbytes, Int_t &objlen, Int_t &keylen)
	Read the logical record header starting at a certain postion.

Long64_t	GetRelOffset () const

const TList *	GetStreamerInfoCache ()
	Returns the cached list of StreamerInfos used in this file.

virtual TList *	GetStreamerInfoList () final
	Read the list of TStreamerInfo objects written to this file.

Int_t	GetVersion () const

virtual void	IncrementProcessIDs ()

virtual Bool_t	IsArchive () const

Bool_t	IsBinary () const

Bool_t	IsRaw () const

void	ls (Option_t *option="") const override
	List file contents.

virtual Bool_t	Matches (const char *name)
	Return kTRUE if 'url' matches the coordinates of this file.

virtual Bool_t	MustFlush () const

virtual Bool_t	ReadBufferAsync (Long64_t offs, Int_t len)

virtual Bool_t	ReadBuffers (char buf, Long64_t pos, Int_t *len, Int_t nbuf)
	Read the nbuf blocks described in arrays pos and len.

virtual TProcessID *	ReadProcessID (UShort_t pidf)
	The TProcessID with number pidf is read from this file.

virtual void	ReadStreamerInfo ()
	Read the list of StreamerInfo from this file.

virtual void	SetCacheRead (TFileCacheRead cache, TObject tree=nullptr, ECacheAction action=kDisconnect)
	Set a pointer to the read cache.

virtual void	SetCacheWrite (TFileCacheWrite *cache)
	Set a pointer to the write cache.

virtual void	SetCompressionAlgorithm (Int_t algorithm=ROOT::RCompressionSetting::EAlgorithm::kUseGlobal)
	See comments for function SetCompressionSettings.

virtual void	SetCompressionLevel (Int_t level=ROOT::RCompressionSetting::ELevel::kUseMin)
	See comments for function SetCompressionSettings.

virtual void	SetCompressionSettings (Int_t settings=ROOT::RCompressionSetting::EDefaults::kUseCompiledDefault)
	Used to specify the compression level and algorithm.

virtual void	SetOffset (Long64_t offset, ERelativeTo pos=kBeg)
	Set position from where to start reading.

virtual void	SetOption (Option_t *option=">")

virtual void	SetReadCalls (Int_t readcalls=0)

virtual void	ShowStreamerInfo ()
	Show the StreamerInfo of all classes written to this file.

void	StreamerNVirtual (TBuffer &ClassDef_StreamerNVirtual_b)

void	SumBuffer (Int_t bufsize)
	Increment statistics for buffer sizes of objects in this file.

virtual UShort_t	WriteProcessID (TProcessID *pid)
	Check if the ProcessID pidd is already in the file, if not, add it and return the index number in the local file list.

Public Member Functions inherited from TDirectoryFile
	TDirectoryFile ()
	Default TDirectoryFile constructor.

	TDirectoryFile (const char name, const char title, Option_t option="", TDirectory motherDir=nullptr)
	Create a new TDirectoryFile.

	~TDirectoryFile () override
	Destructor.

void	Add (TObject *obj, Bool_t replace=kFALSE) override

void	Append (TObject *obj, Bool_t replace=kFALSE) override
	Append object to this directory.

Int_t	AppendKey (TKey *key) override
	Insert key in the linked list of keys of this directory.

void	Browse (TBrowser *b) override
	Browse the content of the directory.

void	Build (TFile motherFile=nullptr, TDirectory motherDir=nullptr) override

Bool_t	cd () override
	Change current directory to "this" directory.

Bool_t	cd (const char *path) override
	Change current directory the directory described by the path if given one.

TObject *	CloneObject (const TObject *obj, Bool_t autoadd=kTRUE) override
	Make a clone of an object using the Streamer facility.

TKey *	FindKey (const char *keyname) const override
	Find key with name keyname in the current directory.

TKey *	FindKeyAny (const char *keyname) const override
	Find key with name keyname in the current directory or its subdirectories.

TObject *	FindObjectAny (const char *name) const override
	Find object by name in the list of memory objects of the current directory or its sub-directories.

TObject *	FindObjectAnyFile (const char *name) const override
	Scan the memory lists of all files for an object with name.

template<class T >
T *	Get (const char *namecycle)
	See documentation of TDirectoryFile::Get(const char *namecycle)

TObject *	Get (const char *namecycle) override
	Return pointer to object identified by namecycle.

Int_t	GetBufferSize () const override
	Return the buffer size to create new TKeys.

const TDatime &	GetCreationDate () const

TDirectory *	GetDirectory (const char apath, Bool_t printError=false, const char funcname="GetDirectory") override
	Find a directory named "apath".

TFile *	GetFile () const override

TKey *	GetKey (const char *name, Short_t cycle=9999) const override
	Return pointer to key with name,cycle.

TList *	GetListOfKeys () const override

const TDatime &	GetModificationDate () const

Int_t	GetNbytesKeys () const override

Int_t	GetNkeys () const override

void *	GetObjectChecked (const char namecycle, const char classname) override
	See documentation of TDirectoryFile::GetObjectCheck(const char namecycle, const TClass cl)

void *	GetObjectChecked (const char namecycle, const TClass cl) override
	Return pointer to object identified by namecycle if and only if the actual object is a type suitable to be stored as a pointer to a "expectedClass" If expectedClass is null, no check is performed.

void *	GetObjectUnchecked (const char *namecycle) override
	Return pointer to object identified by namecycle.

Long64_t	GetSeekDir () const override

Long64_t	GetSeekKeys () const override

Long64_t	GetSeekParent () const override

Bool_t	IsModified () const override

Bool_t	IsWritable () const override

TDirectory *	mkdir (const char name, const char title="", Bool_t returnExistingDirectory=kFALSE) override
	Create a sub-directory "a" or a hierarchy of sub-directories "a/b/c/...".

TFile *	OpenFile (const char name, Option_t option="", const char *ftitle="", Int_t compress=ROOT::RCompressionSetting::EDefaults::kUseCompiledDefault, Int_t netopt=0) override
	Interface to TFile::Open.

void	Purge (Short_t nkeep=1) override
	Purge lowest key cycles in a directory.

void	ReadAll (Option_t *option="") override
	Read objects from a ROOT file directory into memory.

Int_t	ReadKeys (Bool_t forceRead=kTRUE) override
	Read the linked list of keys.

Int_t	ReadTObject (TObject obj, const char keyname) override
	Read object with keyname from the current directory.

virtual void	ResetAfterMerge (TFileMergeInfo *)
	Reset the TDirectory after its content has been merged into another Directory.

void	rmdir (const char *name) override
	Removes subdirectory from the directory.

void	Save () override
	Save recursively all directory keys and headers.

Int_t	SaveObjectAs (const TObject obj, const char filename="", Option_t *option="") const override
	Save object in filename.

void	SaveSelf (Bool_t force=kFALSE) override
	Save Directory keys and header.

void	SetBufferSize (Int_t bufsize) override
	Set the default buffer size when creating new TKeys.

void	SetModified () override

void	SetSeekDir (Long64_t v) override

void	SetTRefAction (TObject ref, TObject parent) override
	Find the action to be executed in the dictionary of the parent class and store the corresponding exec number into fBits.

void	SetWritable (Bool_t writable=kTRUE) override
	Set the new value of fWritable recursively.

void	StreamerNVirtual (TBuffer &ClassDef_StreamerNVirtual_b)

void	WriteDirHeader () override
	Overwrite the Directory header record.

void	WriteKeys () override
	Write Keys linked list on the file.

Int_t	WriteObjectAny (const void obj, const char classname, const char name, Option_t option="", Int_t bufsize=0) override
	Write object from pointer of class classname in this directory.

Int_t	WriteObjectAny (const void obj, const TClass cl, const char name, Option_t option="", Int_t bufsize=0) override
	Write object of class with dictionary cl in this directory.

Int_t	WriteTObject (const TObject obj, const char name=nullptr, Option_t *option="", Int_t bufsize=0) override
	Write object obj to this directory.

Public Member Functions inherited from TDirectory
	TDirectory ()
	Directory default constructor.

	TDirectory (const char name, const char title, Option_t option="", TDirectory motherDir=nullptr)
	Create a new Directory.

virtual	~TDirectory ()
	Destructor.

void	Clear (Option_t *option="") override
	Delete all objects from a Directory list.

virtual void	DeleteAll (Option_t *option="")
	Delete all objects from memory.

TObject *	FindObject (const char *name) const override
	Find object by name in the list of memory objects.

TObject *	FindObject (const TObject *obj) const override
	Find object in the list of memory objects.

template<class T >
T *	Get (const char *namecycle)
	See documentation of TDirectoryFile::Get(const char *namecycle)

virtual TList *	GetList () const

TObject *	GetMother () const

TDirectory *	GetMotherDir () const

template<class T >
void	GetObject (const char namecycle, T &ptr)
	Get an object with proper type checking.

virtual const char *	GetPath () const
	Returns the full path of the directory.

virtual const char *	GetPathStatic () const
	Returns the full path of the directory.

TUUID	GetUUID () const

Bool_t	IsBuilt () const

Bool_t	IsFolder () const override
	Returns kTRUE in case object contains browsable objects (like containers or lists of other objects).

virtual void	pwd () const
	Print the path of the directory.

void	RecursiveRemove (TObject *obj) override
	Recursively remove object from a Directory.

virtual TObject *	Remove (TObject *)
	Remove an object from the in-memory list.

virtual void	SetMother (TObject *mother)

void	SetName (const char *newname) override
	Set the name for directory If the directory name is changed after the directory was written once, ROOT currently would NOT change the name of correspondent key in the mother directory.

void	StreamerNVirtual (TBuffer &ClassDef_StreamerNVirtual_b)

template<typename T >
std::enable_if_t<!std::is_base_of< TObject, T >::value, Int_t >	WriteObject (const T obj, const char name, Option_t *option="", Int_t bufsize=0)
	Write an object with proper type checking.

template<typename T >
std::enable_if_t< std::is_base_of< TObject, T >::value, Int_t >	WriteObject (const T obj, const char name, Option_t *option="", Int_t bufsize=0)
	Write an object with proper type checking.

Public Member Functions inherited from TNamed
	TNamed ()

	TNamed (const char name, const char title)

	TNamed (const TNamed &named)
	TNamed copy ctor.

	TNamed (const TString &name, const TString &title)

virtual	~TNamed ()
	TNamed destructor.

void	Clear (Option_t *option="") override
	Set name and title to empty strings ("").

TObject *	Clone (const char *newname="") const override
	Make a clone of an object using the Streamer facility.

Int_t	Compare (const TObject *obj) const override
	Compare two TNamed objects.

void	Copy (TObject &named) const override
	Copy this to obj.

const char *	GetName () const override
	Returns name of object.

const char *	GetTitle () const override
	Returns title of object.

ULong_t	Hash () const override
	Return hash value for this object.

Bool_t	IsSortable () const override

void	ls (Option_t *option="") const override
	List TNamed name and title.

TNamed &	operator= (const TNamed &rhs)
	TNamed assignment operator.

virtual void	SetNameTitle (const char name, const char title)
	Set all the TNamed parameters (name and title).

virtual void	SetTitle (const char *title="")
	Set the title of the TNamed.

void	StreamerNVirtual (TBuffer &ClassDef_StreamerNVirtual_b)

Public Member Functions inherited from TObject
	TObject ()
	TObject constructor.

	TObject (const TObject &object)
	TObject copy ctor.

virtual	~TObject ()
	TObject destructor.

void	AbstractMethod (const char *method) const
	Use this method to implement an "abstract" method that you don't want to leave purely abstract.

virtual void	AppendPad (Option_t *option="")
	Append graphics object to current pad.

ULong_t	CheckedHash ()
	Check and record whether this class has a consistent Hash/RecursiveRemove setup (*) and then return the regular Hash value for this object.

virtual const char *	ClassName () const
	Returns name of class to which the object belongs.

virtual Int_t	DistancetoPrimitive (Int_t px, Int_t py)
	Computes distance from point (px,py) to the object.

virtual void	DrawClass () const
	Draw class inheritance tree of the class to which this object belongs.

virtual TObject *	DrawClone (Option_t *option="") const
	Draw a clone of this object in the current selected pad with: `gROOT->SetSelectedPad(c1)`.

virtual void	Dump () const
	Dump contents of object on stdout.

virtual void	Error (const char method, const char msgfmt,...) const
	Issue error message.

virtual void	Execute (const char method, const char params, Int_t *error=nullptr)
	Execute method on this object with the given parameter string, e.g.

virtual void	Execute (TMethod method, TObjArray params, Int_t *error=nullptr)
	Execute method on this object with parameters stored in the TObjArray.

virtual void	ExecuteEvent (Int_t event, Int_t px, Int_t py)
	Execute action corresponding to an event at (px,py).

virtual void	Fatal (const char method, const char msgfmt,...) const
	Issue fatal error message.

virtual Option_t *	GetDrawOption () const
	Get option used by the graphics system to draw this object.

virtual const char *	GetIconName () const
	Returns mime type name of object.

virtual char *	GetObjectInfo (Int_t px, Int_t py) const
	Returns string containing info about the object at position (px,py).

virtual UInt_t	GetUniqueID () const
	Return the unique object id.

virtual Bool_t	HandleTimer (TTimer *timer)
	Execute action in response of a timer timing out.

Bool_t	HasInconsistentHash () const
	Return true is the type of this object is known to have an inconsistent setup for Hash and RecursiveRemove (i.e.

virtual void	Info (const char method, const char msgfmt,...) const
	Issue info message.

virtual Bool_t	InheritsFrom (const char *classname) const
	Returns kTRUE if object inherits from class "classname".

virtual Bool_t	InheritsFrom (const TClass *cl) const
	Returns kTRUE if object inherits from TClass cl.

virtual void	Inspect () const
	Dump contents of this object in a graphics canvas.

void	InvertBit (UInt_t f)

Bool_t	IsDestructed () const
	IsDestructed.

virtual Bool_t	IsEqual (const TObject *obj) const
	Default equal comparison (objects are equal if they have the same address in memory).

R__ALWAYS_INLINE Bool_t	IsOnHeap () const

R__ALWAYS_INLINE Bool_t	IsZombie () const

void	MayNotUse (const char *method) const
	Use this method to signal that a method (defined in a base class) may not be called in a derived class (in principle against good design since a child class should not provide less functionality than its parent, however, sometimes it is necessary).

virtual Bool_t	Notify ()
	This method must be overridden to handle object notification (the base implementation is no-op).

void	Obsolete (const char method, const char asOfVers, const char *removedFromVers) const
	Use this method to declare a method obsolete.

void	operator delete (void *ptr)
	Operator delete.

void	operator delete (void ptr, void vp)
	Only called by placement new when throwing an exception.

void	operator delete[] (void *ptr)
	Operator delete [].

void	operator delete[] (void ptr, void vp)
	Only called by placement new[] when throwing an exception.

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)
	TObject assignment operator.

virtual void	Pop ()
	Pop on object drawn in a pad to the top of the display list.

virtual Int_t	Read (const char *name)
	Read contents of object with specified name from the current directory.

void	ResetBit (UInt_t f)

virtual void	SaveAs (const char filename="", Option_t option="") const
	Save this object in the file specified by filename.

virtual void	SavePrimitive (std::ostream &out, Option_t *option="")
	Save a primitive as a C++ statement(s) on output stream "out".

void	SetBit (UInt_t f)

void	SetBit (UInt_t f, Bool_t set)
	Set or unset the user status bits as specified in f.

virtual void	SetDrawOption (Option_t *option="")
	Set drawing option for object.

virtual void	SetUniqueID (UInt_t uid)
	Set the unique object id.

void	StreamerNVirtual (TBuffer &ClassDef_StreamerNVirtual_b)

virtual void	SysError (const char method, const char msgfmt,...) const
	Issue system error message.

R__ALWAYS_INLINE Bool_t	TestBit (UInt_t f) const

Int_t	TestBits (UInt_t f) const

virtual void	UseCurrentStyle ()
	Set current style settings in this object This function is called when either TCanvas::UseCurrentStyle or TROOT::ForceStyle have been invoked.

virtual void	Warning (const char method, const char msgfmt,...) const
	Issue warning message.

Static Public Member Functions
static TClass *	Class ()

static const char *	Class_Name ()

static constexpr Version_t	Class_Version ()

static const char *	DeclFileName ()

Static Public Member Functions inherited from TFile
static TFileOpenHandle *	AsyncOpen (const char name, Option_t option="", const char *ftitle="", Int_t compress=ROOT::RCompressionSetting::EDefaults::kUseCompiledDefault, Int_t netopt=0)
	Submit an asynchronous open request.

static TClass *	Class ()

static const char *	Class_Name ()

static constexpr Version_t	Class_Version ()

static Bool_t	Cp (const char src, const char dst, Bool_t progressbar=kTRUE, UInt_t buffersize=1000000)
	Allows to copy file from src to dst URL.

static TFile *&	CurrentFile ()
	Return the current ROOT file if any.

static const char *	DeclFileName ()

static EAsyncOpenStatus	GetAsyncOpenStatus (const char *name)
	Get status of the async open request related to 'name'.

static EAsyncOpenStatus	GetAsyncOpenStatus (TFileOpenHandle *handle)
	Get status of the async open request related to 'handle'.

static const char *	GetCacheFileDir ()
	Get the directory where to locally stage/cache remote files.

static const TUrl *	GetEndpointUrl (const char *name)
	Get final URL for file being opened asynchronously.

static Long64_t	GetFileBytesRead ()
	Static function returning the total number of bytes read from all files.

static Long64_t	GetFileBytesWritten ()
	Static function returning the total number of bytes written to all files.

static Long64_t	GetFileCounter ()

static Int_t	GetFileReadCalls ()
	Static function returning the total number of read calls from all files.

static Bool_t	GetOnlyStaged ()
	Returns staged only flag.

static UInt_t	GetOpenTimeout ()
	Returns open timeout (in ms).

static Int_t	GetReadaheadSize ()
	Static function returning the readahead buffer size.

static Bool_t	GetReadStreamerInfo ()
	If the streamerinfos are to be read at file opening.

static EFileType	GetType (const char name, Option_t option="", TString *prefix=nullptr)
	Resolve the file type as a function of the protocol field in 'name'.

static void	IncrementFileCounter ()

static TFile *	Open (const char name, Option_t option="", const char *ftitle="", Int_t compress=ROOT::RCompressionSetting::EDefaults::kUseCompiledDefault, Int_t netopt=0)
	Create / open a file.

static TFile *	Open (TFileOpenHandle *handle)
	Waits for the completion of an asynchronous open request.

static Bool_t	SetCacheFileDir (ROOT::Internal::TStringView cacheDir, Bool_t operateDisconnected=kTRUE, Bool_t forceCacheread=kFALSE)

static Bool_t	SetCacheFileDir (std::string_view cacheDir, Bool_t operateDisconnected=kTRUE, Bool_t forceCacheread=kFALSE)
	Sets the directory where to locally stage/cache remote files.

static void	SetFileBytesRead (Long64_t bytes=0)

static void	SetFileBytesWritten (Long64_t bytes=0)

static void	SetFileReadCalls (Int_t readcalls=0)

static Bool_t	SetOnlyStaged (Bool_t onlystaged)
	Sets only staged flag.

static UInt_t	SetOpenTimeout (UInt_t timeout)
	Sets open timeout time (in ms). Returns previous timeout value.

static void	SetReadaheadSize (Int_t bufsize=256000)

static void	SetReadStreamerInfo (Bool_t readinfo=kTRUE)
	Specify if the streamerinfos must be read at file opening.

static Bool_t	ShrinkCacheFileDir (Long64_t shrinkSize, Long_t cleanupInteval=0)
	Try to shrink the cache to the desired size.

Static Public Member Functions inherited from TDirectoryFile
static TClass *	Class ()

static const char *	Class_Name ()

static constexpr Version_t	Class_Version ()

static const char *	DeclFileName ()

Static Public Member Functions inherited from TDirectory
static void	AddDirectory (Bool_t add=kTRUE)
	Sets the flag controlling the automatic add objects like histograms, TGraph2D, etc in memory.

static Bool_t	AddDirectoryStatus ()
	Static function: see TDirectory::AddDirectory for more comments.

static Bool_t	Cd (const char *path)
	Change current directory to "path".

static TClass *	Class ()

static const char *	Class_Name ()

static constexpr Version_t	Class_Version ()

static std::atomic< TDirectory * > &	CurrentDirectory ()
	Return the current directory for the current thread.

static const char *	DeclFileName ()

static void	DecodeNameCycle (const char namecycle, char name, Short_t &cycle, const size_t namesize=0)
	Decode a namecycle "aap;2" into name "aap" and cycle "2".

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 ()
	Return destructor only flag.

static Bool_t	GetObjectStat ()
	Get status of object stat flag.

static void	SetDtorOnly (void *obj)
	Set destructor only flag.

static void	SetObjectStat (Bool_t stat)
	Turn on/off tracking of objects in the TObjectTable.

Protected Types
enum	ELockingKinds { kLockFree = 0 , kLockBusy = 1 }

Protected Types inherited from TDirectory
using	SharedGDirectory_t = std::shared_ptr< std::atomic< TDirectory * > >
	Pointer to a list of TContext object pointing to this TDirectory.

Protected Types inherited from TObject
enum	{ kOnlyPrepStep = (1ULL << ( 3 )) }

Protected Member Functions
void	AddIdEntry (Long64_t tableid, Int_t subid, Int_t type, const char name, const char sqlname, const char *info)
	Add entry into IdsTable, where all tables names and columns names are listed.

TString	CodeLongString (Long64_t objid, Int_t strid)
	Produces id which will be placed in column instead of string itself.

void	CreateBasicTables ()
	Creates initial tables in database This is table with configurations and table with keys Function called once when first object is stored to the file.

Bool_t	CreateClassTable (TSQLClassInfo sqlinfo, TObjArray colinfos)
	Create normal class table if required.

Bool_t	CreateRawTable (TSQLClassInfo *sqlinfo)
	Create the raw table.

Long64_t	DefineNextKeyId ()
	Returns next possible key identifier.

TString	DefineTableName (const char *clname, Int_t version, Bool_t rawtable)
	Proposes table name for class.

void	DeleteKeyFromDB (Long64_t keyid)
	Remove key with specified id from keys table also removes all objects data, related to this table.

Long64_t	DirCreateEntry (TDirectory *) final
	Create entry for directory in database.

Int_t	DirReadKeys (TDirectory *) final
	Read directory list of keys from database.

void	DirWriteHeader (TDirectory *) final
	Update dir header in the file.

void	DirWriteKeys (TDirectory *) final
	Write directory keys list to database.

TSQLClassInfo *	FindSQLClassInfo (const char *clname, Int_t version)
	Return (if exists) TSQLClassInfo for specified class name and version.

TSQLClassInfo *	FindSQLClassInfo (const TClass *cl)
	return (if exists) TSQLClassInfo for specified class

TKeySQL *	FindSQLKey (TDirectory *dir, Long64_t keyid)
	Search for TKeySQL object with specified keyid.

TSQLResult *	GetBlobClassData (Long64_t objid, TSQLClassInfo *sqlinfo)
	Method return request results for specified objid from streamer classtable.

TSQLStatement *	GetBlobClassDataStmt (Long64_t objid, TSQLClassInfo *sqlinfo)
	Method return request results for specified objid from streamer classtable Data returned in form of statement, where direct access to values are possible.

Int_t	GetLocking ()
	Return current locking mode for that file.

Bool_t	GetLongString (Long64_t objid, Int_t strid, TString &value)
	Returns value of string, extracted from special table, where long strings are stored.

TSQLResult *	GetNormalClassData (Long64_t objid, TSQLClassInfo *sqlinfo)
	Method return request result for specified objid from normal classtable.

TSQLResult *	GetNormalClassDataAll (Long64_t minobjid, Long64_t maxobjid, TSQLClassInfo *sqlinfo)
	Return data for several objects from the range from normal class table.

InfoListRet	GetStreamerInfoListImpl (bool) final
	Read back streamer infos from database List of streamer infos is always stored with key:id 0, which is not shown in normal keys list.

Bool_t	HasTable (const char *name)
	Test if table name exists.

void	IncrementModifyCounter ()
	Update value of modify counter in config table Modify counter used to indicate that something was changed in database.

void	InitSqlDatabase (Bool_t create)
	initialize sql database and correspondent structures identical to TFile::Init() function

Int_t	IsLongStringCode (Long64_t objid, const char *value)
	Checks if this is long string code returns 0, if not or string id.

Bool_t	IsReadAccess ()
	dummy, in future should check about read access to database

Bool_t	IsTablesExists ()
	Checks if main keys table is existing.

Bool_t	IsWriteAccess ()
	Checkis, if lock is free in configuration tables.

Bool_t	ProduceClassSelectQuery (TVirtualStreamerInfo info, TSQLClassInfo sqlinfo, TString &columns, TString &tables, Int_t &tablecnt)
	used by MakeClassSelectQuery method to add columns from table of class, specified by TVirtualStreamerInfo structure

Bool_t	ReadConfigurations ()
	read table configurations as special table

TObject *	ReadSpecialObject (Long64_t keyid, TObject *obj=nullptr)
	Read data of special kind of objects.

void	ReadSQLClassInfos ()
	Read all class infos from IdsTable.

TSQLClassInfo *	RequestSQLClassInfo (const char *clname, Int_t version)
	Search in database tables for specified class and return TSQLClassInfo object.

TSQLClassInfo *	RequestSQLClassInfo (const TClass *cl)
	Search in database tables for specified class and return TSQLClassInfo object.

void	SaveToDatabase ()
	save data which is not yet in Database Typically this is streamerinfos structures or

void	SetLocking (Int_t mode)
	Set locking mode for current database.

Bool_t	SQLApplyCommands (TObjArray *cmds)
	supplies set of commands to server Commands is stored as array of TObjString

const char *	SQLBigTextType () const

Bool_t	SQLCanStatement ()
	Test if DB support statement and number of open statements is not exceeded.

Bool_t	SQLCommit ()
	Commit SQL transaction.

const char *	SQLCompatibleType (Int_t typ) const
	Returns sql type name which is most closer to ROOT basic type.

const char *	SQLDatetimeType () const

const char *	SQLDefaultTableType () const

void	SQLDeleteAllTables ()
	Delete all tables in database.

void	SQLDeleteStatement (TSQLStatement *stmt)
	delete statement and decrease counter

const char *	SQLDirIdColumn () const

const char *	SQLIdentifierQuote () const

const char *	SQLIntType () const
	return SQL integer type

const char *	SQLKeyIdColumn () const

Int_t	SQLMaxIdentifierLength ()
	returns maximum allowed length of identifiers

Long64_t	SQLMaximumValue (const char tablename, const char columnname)
	Returns maximum value, found in specified columnname of table tablename Column type should be numeric.

const char *	SQLNameSeparator () const

const char *	SQLObjectIdColumn () const

Bool_t	SQLObjectInfo (Long64_t objid, TString &clname, Version_t &version)
	Read from objects table data for specified objectid.

TObjArray *	SQLObjectsInfo (Long64_t keyid)
	Produce array of TSQLObjectInfo objects for all objects, belong to that key Array should be deleted by calling function afterwards.

TSQLResult *	SQLQuery (const char cmd, Int_t flag=0, Bool_t res=nullptr)
	Submits query to SQL server.

const char *	SQLRawIdColumn () const

Bool_t	SQLRollback ()
	Rollback all SQL operations, done after start transaction.

const char *	SQLSmallTextType () const

Int_t	SQLSmallTextTypeLimit () const

Bool_t	SQLStartTransaction ()
	Start SQL transaction.

TSQLStatement *	SQLStatement (const char *cmd, Int_t bufsize=1000)
	Produces SQL statement for currently conected DB server.

const char *	SQLStrIdColumn () const

Bool_t	SQLTestTable (const char *tablename)
	Test, if table of specified name exists.

const char *	SQLValueQuote () const

Long64_t	StoreObjectInTables (Long64_t keyid, const void obj, const TClass cl)
	Store object in database. Return stored object id or -1 if error.

Int_t	StreamKeysForDirectory (TDirectory dir, Bool_t doupdate, Long64_t specialkeyid=-1, TKeySQL *specialkey=nullptr)
	read keys for specified directory (when update == kFALSE) or update value for modified keys when update == kTRUE Returns number of successfully read keys or -1 if error

Int_t	SysClose (Int_t) final
	Interface to system close. All arguments like in POSIX close().

Int_t	SysOpen (const char *, Int_t, UInt_t) final
	Interface to system open. All arguments like in POSIX open().

Int_t	SysRead (Int_t, void *, Int_t) final
	Interface to system read. All arguments like in POSIX read().

Long64_t	SysSeek (Int_t, Long64_t, Int_t) final
	Interface to system lseek.

Int_t	SysStat (Int_t, Long_t , Long64_t , Long_t , Long_t ) final
	Return file stat information.

Int_t	SysSync (Int_t) final
	Interface to system fsync. All arguments like in POSIX fsync().

Int_t	SysWrite (Int_t, const void *, Int_t) final
	Interface to system write. All arguments like in POSIX write().

Bool_t	UpdateKeyData (TKeySQL *key)
	Updates (overwrites) key data in KeysTable.

Bool_t	VerifyLongStringTable ()
	Checks that table for big strings is exists If not, will be created.

Long64_t	VerifyObjectTable ()
	Checks that objects table is exists If not, table will be created Returns maximum value for existing objects id.

Bool_t	WriteKeyData (TKeySQL *key)
	Add entry into keys table.

Bool_t	WriteSpecialObject (Long64_t keyid, TObject obj, const char name, const char *title)
	write special kind of object like streamer infos or file itself keys for that objects should exist in tables but not indicated in list of keys, therefore users can not get them with TDirectoryFile::Get() method

Protected Member Functions inherited from TFile
Bool_t	FlushWriteCache ()
	Flush the write cache if active.

virtual EAsyncOpenStatus	GetAsyncOpenStatus ()

virtual void	Init (Bool_t create)
	Initialize a TFile object.

Int_t	MakeProjectParMake (const char packname, const char filename)
	Create makefile at 'filemake' for PAR package 'pack'.

Int_t	MakeProjectParProofInf (const char packname, const char proofinfdir)
	Create BUILD.sh and SETUP.C under 'proofinf' for PAR package 'pack'.

Int_t	ReadBufferViaCache (char *buf, Int_t len)
	Read buffer via cache.

Int_t	WriteBufferViaCache (const char *buf, Int_t len)
	Write buffer via cache.

Protected Member Functions inherited from TDirectoryFile
void	BuildDirectoryFile (TFile motherFile, TDirectory motherDir)
	Initialise directory to defaults.

void	CleanTargets ()
	Clean the pointers to this object (gDirectory, TContext, etc.)

void	InitDirectoryFile (TClass *cl=nullptr)
	Initialize the key associated with this directory (and the related data members.

Protected Member Functions inherited from TDirectory
	TDirectory (const TDirectory &directory)=delete

void	BuildDirectory (TFile motherFile, TDirectory motherDir)
	Initialise directory to defaults.

Bool_t	cd1 (const char *path)
	flag to add histograms, graphs,etc to the directory

void	CleanTargets ()
	Clean the pointers to this object (gDirectory, TContext, etc.).

void	FillFullPath (TString &buf) const
	Recursive method to fill full path for directory.

void	operator= (const TDirectory &)=delete

void	RegisterContext (TContext *ctxt)
	Register a TContext pointing to this TDirectory object.

void	RegisterGDirectory (SharedGDirectory_t &ptr)
	Register a std::atomic<TDirectory*> that will soon be pointing to this TDirectory object.

void	UnregisterContext (TContext *ctxt)
	UnRegister a TContext pointing to this TDirectory object.

Protected Member Functions inherited from TObject
virtual void	DoError (int level, const char location, const char fmt, va_list va) const
	Interface to ErrorHandler (protected).

void	MakeZombie ()

Protected Attributes
Int_t	fArrayLimit
	! limit for array size. when array bigger, its content converted to raw format

const char **	fBasicTypes
	! pointer on list of basic types specific for currently connected SQL server

Bool_t	fCanChangeConfig
	! variable indicates can be basic configuration changed or not

Bool_t	fIdsTableExists
	! indicate if IdsTable exists

std::ofstream *	fLogFile
	! log file with SQL statements

Int_t	fModifyCounter
	! indicates how many changes was done with database tables

const char **	fOtherTypes
	! pointer on list of other SQL types like TEXT or blob

Int_t	fQuerisCounter
	! how many query was applied

TSQLServer *	fSQL
	! interface to SQL database

TList *	fSQLClassInfos
	! list of SQL class infos

Int_t	fSQLIOversion
	! version of SQL I/O which is stored in configurations

Int_t	fStmtCounter
	! count numbers of active statements

TString	fTablesType
	! type, used in CREATE TABLE statements

Int_t	fUseIndexes
	! use indexes for tables: 0 - off, 1 - only for basic tables, 2 + normal class tables, 3 - all tables

TString	fUserName
	! user name, used to access objects from database

Bool_t	fUseSuffixes
	! use suffixes in column names like fValue:Int_t or fObject:pointer

Int_t	fUseTransactions
	! use transaction statements for writing data into the tables

Protected Attributes inherited from TFile
TArchiveFile *	fArchive {nullptr}
	!Archive file from which we read this file

Long64_t	fArchiveOffset {0}
	!Offset at which file starts in archive

TFileOpenHandle *	fAsyncHandle {nullptr}
	!For proper automatic cleanup

EAsyncOpenStatus	fAsyncOpenStatus {kAOSNotAsync}
	!Status of an asynchronous open request

Long64_t	fBEGIN {0}
	First used byte in file.

Long64_t	fBytesRead {0}
	Number of bytes read from this file.

Long64_t	fBytesReadExtra {0}
	Number of extra bytes (overhead) read by the readahead buffer.

Long64_t	fBytesWrite {0}
	Number of bytes written to this file.

TFileCacheRead *	fCacheRead {nullptr}
	!Pointer to the read cache (if any)

TMap *	fCacheReadMap {nullptr}
	!Pointer to the read cache (if any)

TFileCacheWrite *	fCacheWrite {nullptr}
	!Pointer to the write cache (if any)

TArrayC *	fClassIndex {nullptr}
	!Index of TStreamerInfo classes written to this file

Int_t	fCompress {0}
	Compression level and algorithm.

Int_t	fD {-1}
	File descriptor.

Long64_t	fEND {0}
	Last used byte in file.

TList *	fFree {nullptr}
	Free segments linked list table.

bool	fGlobalRegistration = true
	! if true, bypass use of global lists

TList *	fInfoCache {nullptr}
	!Cached list of the streamer infos in this file

Bool_t	fInitDone {kFALSE}
	!True if the file has been initialized

Bool_t	fIsArchive {kFALSE}
	!True if this is a pure archive file

Bool_t	fIsPcmFile {kFALSE}
	!True if the file is a ROOT pcm file.

Bool_t	fIsRootFile {kTRUE}
	!True is this is a ROOT file, raw file otherwise

Bool_t	fMustFlush {kTRUE}
	!True if the file buffers must be flushed

Int_t	fNbytesFree {0}
	Number of bytes for free segments structure.

Int_t	fNbytesInfo {0}
	Number of bytes for StreamerInfo record.

Bool_t	fNoAnchorInName {kFALSE}
	!True if we don't want to force the anchor to be appended to the file name

Int_t	fNProcessIDs {0}
	Number of TProcessID written to this file.

Long64_t	fOffset {0}
	!Seek offset cache

TList *	fOpenPhases {nullptr}
	!Time info about open phases

TString	fOption
	File options.

TObjArray *	fProcessIDs {nullptr}
	!Array of pointers to TProcessIDs

Int_t	fReadCalls {0}
	Number of read calls ( not counting the cache calls )

TString	fRealName
	Effective real file name (not original url)

Long64_t	fSeekFree {0}
	Location on disk of free segments structure.

Long64_t	fSeekInfo {0}
	Location on disk of StreamerInfo record.

Double_t	fSum2Buffer {0}
	Sum of squares of buffer sizes of objects written so far.

Double_t	fSumBuffer {0}
	Sum of buffer sizes of objects written so far.

Char_t	fUnits {0}
	Number of bytes for file pointers.

TUrl	fUrl
	!URL of file

Int_t	fVersion {0}
	File format version.

std::mutex	fWriteMutex
	!Lock for writing baskets / keys into the file.

Int_t	fWritten {0}
	Number of objects written so far.

Protected Attributes inherited from TDirectoryFile
Int_t	fBufferSize {0}
	Default buffer size to create new TKeys.

TDatime	fDatimeC
	Date and time when directory is created.

TDatime	fDatimeM
	Date and time of last modification.

TFile *	fFile {nullptr}
	Pointer to current file in memory.

TList *	fKeys {nullptr}
	Pointer to keys list in memory.

Bool_t	fModified {kFALSE}
	True if directory has been modified.

Int_t	fNbytesKeys {0}
	Number of bytes for the keys.

Int_t	fNbytesName {0}
	Number of bytes in TNamed at creation time.

Long64_t	fSeekDir {0}
	Location of directory on file.

Long64_t	fSeekKeys {0}
	Location of Keys record on file.

Long64_t	fSeekParent {0}
	Location of parent directory on file.

Bool_t	fWritable {kFALSE}
	True if directory is writable.

Protected Attributes inherited from TDirectory
TContext *	fContext {nullptr}
	Buffer for GetPath() function.

std::atomic< size_t >	fContextPeg {0}
	thread local gDirectory pointing to this object.

std::vector< SharedGDirectory_t >	fGDirectories

TList *	fList {nullptr}

TObject *	fMother {nullptr}

TString	fPathBuffer

std::atomic_flag	fSpinLock
	Counter delaying the TDirectory destructor from finishing.

TUUID	fUUID

Protected Attributes inherited from TNamed
TString	fName

TString	fTitle

Private Member Functions
	TSQLFile (const TSQLFile &)=delete

void	operator= (const TSQLFile &)=delete

Friends
class	TBufferSQL2

class	TKeySQL

class	TSqlCmdsBuffer

class	TSqlRawBuffer

class	TSqlRegistry

class	TSQLStructure

class	TSQLTableData

Additional Inherited Members
Static Protected Member Functions inherited from TDirectory
static Bool_t	Cd1 (const char *path)
	Change current directory to "path".

static SharedGDirectory_t &	GetSharedLocalCurrentDirectory ()
	Return the (address of) a shared pointer to the struct holding the actual thread local gDirectory pointer and the atomic_flag for its lock.

Static Protected Attributes inherited from TFile
static TList *	fgAsyncOpenRequests = nullptr

static std::atomic< Long64_t >	fgBytesRead {0}
	Number of bytes read by all TFile objects.

static std::atomic< Long64_t >	fgBytesWrite {0}
	Number of bytes written by all TFile objects.

static TString	fgCacheFileDir
	Directory where to locally stage files.

static Bool_t	fgCacheFileDisconnected = kTRUE
	Indicates, we trust in the files in the cache dir without stat on the cached file.

static Bool_t	fgCacheFileForce = kFALSE
	Indicates, to force all READ to CACHEREAD.

static std::atomic< Long64_t >	fgFileCounter {0}
	Counter for all opened files.

static Bool_t	fgOnlyStaged = kFALSE
	Before the file is opened, it is checked, that the file is staged, if not, the open fails.

static UInt_t	fgOpenTimeout = TFile::kEternalTimeout
	Timeout for open operations in ms - 0 corresponds to blocking i/o.

static Int_t	fgReadaheadSize = 256000
	Readahead buffer size.

static std::atomic< Int_t >	fgReadCalls {0}
	Number of bytes read from all TFile objects.

static Bool_t	fgReadInfo = kTRUE
	if true (default) ReadStreamerInfo is called when opening a file

static ROOT::Internal::RConcurrentHashColl	fgTsSIHashes
	!TS Set of hashes built from read streamer infos

Static Protected Attributes inherited from TDirectory
static Bool_t	fgAddDirectory = kTRUE
	MSVC doesn't support = ATOMIC_FLAG_INIT;.

#include <TSQLFile.h>

Inheritance diagram for TSQLFile:

[legend]

Member Enumeration Documentation

◆ EIndexesKinds

enum TSQLFile::EIndexesKinds

Enumerator
kIndexesNone
kIndexesBasic
kIndexesClass
kIndexesAll

Definition at line 177 of file TSQLFile.h.

◆ ELockingKinds

enum TSQLFile::ELockingKinds

protected

Enumerator
kLockFree
kLockBusy

Definition at line 41 of file TSQLFile.h.

◆ ETransactionKinds

enum TSQLFile::ETransactionKinds

Enumerator
kTransactionsOff
kTransactionsAuto
kTransactionsUser

Definition at line 175 of file TSQLFile.h.

Constructor & Destructor Documentation

◆ TSQLFile() [1/3]

TSQLFile::TSQLFile ( const TSQLFile & )

privatedelete

◆ TSQLFile() [2/3]

TSQLFile::TSQLFile ( )

default TSQLFile constructor

Definition at line 271 of file TSQLFile.cxx.

◆ TSQLFile() [3/3]

TSQLFile::TSQLFile	(	const char *	dbname,
		Option_t *	option = `"read"`,
		const char *	user = `"user"`,
		const char *	pass = `"pass"`
	)

Connects to SQL server with provided arguments.

If the constructor fails in any way IsZombie() will return true. Use IsOpen() to check if the file is (still) open.

Option	Description
NEW or CREATE	Create a ROOT tables in database if the tables already exists connection is not opened.
RECREATE	Create completely new tables. Any existing table will be deleted.
UPDATE	Open an existing database for writing. If data base open by other TSQLFile instance for writing,

write access will be rejected.| | BREAKLOCK | Special case when lock was not correctly released by TSQLFile instance. This may happen if program crashed when TSQLFile was open with write access mode.| | READ / OPEN | Open an existing data base for reading.|

For more details see comments for TFile::TFile() constructor. For a moment TSQLFile does not support TTree objects and subdirectories.

Definition at line 297 of file TSQLFile.cxx.

◆ ~TSQLFile()

TSQLFile::~TSQLFile ( )

override

destructor of TSQLFile object

Definition at line 689 of file TSQLFile.cxx.

Member Function Documentation

◆ AddIdEntry()

void TSQLFile::AddIdEntry	(	Long64_t	tableid,
		Int_t	subid,
		Int_t	type,
		const char *	name,
		const char *	sqlname,
		const char *	info
	)

protected

Add entry into IdsTable, where all tables names and columns names are listed.

Definition at line 2018 of file TSQLFile.cxx.

◆ Class()

static TClass * TSQLFile::Class ( )

static

Returns: TClass describing this class

◆ Class_Name()

static const char * TSQLFile::Class_Name ( )

static

Returns: Name of this class

◆ Class_Version()

static constexpr Version_t TSQLFile::Class_Version ( )

inlinestaticconstexpr

Returns: Version of this class

Definition at line 254 of file TSQLFile.h.

◆ Close()

void TSQLFile::Close ( Option_t * option = "" )

finalvirtual

Close a SQL file For more comments see TFile::Close() function.

Reimplemented from TFile.

Definition at line 641 of file TSQLFile.cxx.

◆ CodeLongString()

TString TSQLFile::CodeLongString	(	Long64_t	objid,
		Int_t	strid
	)

protected

Produces id which will be placed in column instead of string itself.

Definition at line 2214 of file TSQLFile.cxx.

◆ Commit()

Bool_t TSQLFile::Commit ( )

Commit transaction, started by StartTransaction() call.

Only after that call data will be written and visible on database side.

Definition at line 579 of file TSQLFile.cxx.

◆ CreateBasicTables()

void TSQLFile::CreateBasicTables ( )

protected

Creates initial tables in database This is table with configurations and table with keys Function called once when first object is stored to the file.

Definition at line 1116 of file TSQLFile.cxx.

◆ CreateClassTable()

Bool_t TSQLFile::CreateClassTable	(	TSQLClassInfo *	sqlinfo,
		TObjArray *	colinfos
	)

protected

Create normal class table if required.

Definition at line 2059 of file TSQLFile.cxx.

◆ CreateKey() [1/2]

TKey * TSQLFile::CreateKey	(	TDirectory *	mother,
		const TObject *	obj,
		const char *	name,
		Int_t	bufsize
	)

finalvirtual

create SQL key, which will store object in data base

Reimplemented from TFile.

Definition at line 766 of file TSQLFile.cxx.

◆ CreateKey() [2/2]

TKey * TSQLFile::CreateKey	(	TDirectory *	mother,
		const void *	obj,
		const TClass *	cl,
		const char *	name,
		Int_t	bufsize
	)

finalvirtual

create SQL key, which will store object in data base

Reimplemented from TFile.

Definition at line 774 of file TSQLFile.cxx.

◆ CreateRawTable()

Bool_t TSQLFile::CreateRawTable ( TSQLClassInfo * sqlinfo )

protected

Create the raw table.

Definition at line 2141 of file TSQLFile.cxx.

◆ DeclFileName()

static const char * TSQLFile::DeclFileName ( )

inlinestatic

Returns: Name of the file containing the class declaration

Definition at line 254 of file TSQLFile.h.

◆ DefineNextKeyId()

Long64_t TSQLFile::DefineNextKeyId ( )

protected

Returns next possible key identifier.

Definition at line 1757 of file TSQLFile.cxx.

◆ DefineTableName()

TString TSQLFile::DefineTableName	(	const char *	clname,
		Int_t	version,
		Bool_t	rawtable
	)

protected

Proposes table name for class.

Definition at line 1834 of file TSQLFile.cxx.

◆ DeleteKeyFromDB()

void TSQLFile::DeleteKeyFromDB ( Long64_t keyid )

protected

Remove key with specified id from keys table also removes all objects data, related to this table.

Definition at line 1612 of file TSQLFile.cxx.

◆ DirCreateEntry()

Long64_t TSQLFile::DirCreateEntry ( TDirectory * dir )

finalprotectedvirtual

Create entry for directory in database.

Reimplemented from TFile.

Definition at line 2582 of file TSQLFile.cxx.

◆ DirReadKeys()

Int_t TSQLFile::DirReadKeys ( TDirectory * dir )

finalprotectedvirtual

Read directory list of keys from database.

Reimplemented from TFile.

Definition at line 2597 of file TSQLFile.cxx.

◆ DirWriteHeader()

void TSQLFile::DirWriteHeader ( TDirectory * dir )

finalprotectedvirtual

Update dir header in the file.

Reimplemented from TFile.

Definition at line 2619 of file TSQLFile.cxx.

◆ DirWriteKeys()

void TSQLFile::DirWriteKeys ( TDirectory * dir )

finalprotectedvirtual

Write directory keys list to database.

Reimplemented from TFile.

Definition at line 2611 of file TSQLFile.cxx.

◆ DrawMap()

void TSQLFile::DrawMap	(	const char *	keys = `"*"`,
		Option_t *	option = `""`
	)

inlinefinalvirtual

Draw map of objects in this file.

The map drawing is handled by TFileDrawMap. Once the map is drawn, turn on the TCanvas option "View->Event Statusbar". Then, when moving the mouse in the canvas, the "Event Status" panels shows the object corresponding to the mouse position.

Example:

auto f = new TFile("myfile.root");

f->DrawMap();

TFile::TFile

TFile()

File default Constructor.

Definition TFile.cxx:191

Reimplemented from TFile.

Definition at line 210 of file TSQLFile.h.

◆ FillBuffer()

void TSQLFile::FillBuffer ( char *& buffer )

inlinefinalvirtual

Encode file output buffer.

The file output buffer contains only the FREE data record.

Reimplemented from TFile.

Definition at line 211 of file TSQLFile.h.

◆ FindSQLClassInfo() [1/2]

TSQLClassInfo * TSQLFile::FindSQLClassInfo	(	const char *	clname,
		Int_t	version
	)

protected

Return (if exists) TSQLClassInfo for specified class name and version.

Definition at line 1773 of file TSQLFile.cxx.

◆ FindSQLClassInfo() [2/2]

TSQLClassInfo * TSQLFile::FindSQLClassInfo ( const TClass * cl )

protected

return (if exists) TSQLClassInfo for specified class

Definition at line 1792 of file TSQLFile.cxx.

◆ FindSQLKey()

TKeySQL * TSQLFile::FindSQLKey	(	TDirectory *	dir,
		Long64_t	keyid
	)

protected

Search for TKeySQL object with specified keyid.

Definition at line 1671 of file TSQLFile.cxx.

◆ Flush()

void TSQLFile::Flush ( )

inlinefinalvirtual

Synchronize a file's in-memory and on-disk states.

Reimplemented from TFile.

Definition at line 212 of file TSQLFile.h.

◆ GetArrayLimit()

Int_t TSQLFile::GetArrayLimit ( ) const

inline

Definition at line 186 of file TSQLFile.h.

◆ GetBlobClassData()

TSQLResult * TSQLFile::GetBlobClassData	(	Long64_t	objid,
		TSQLClassInfo *	sqlinfo
	)

protected

Method return request results for specified objid from streamer classtable.

Definition at line 2464 of file TSQLFile.cxx.

◆ GetBlobClassDataStmt()

TSQLStatement * TSQLFile::GetBlobClassDataStmt	(	Long64_t	objid,
		TSQLClassInfo *	sqlinfo
	)

protected

Method return request results for specified objid from streamer classtable Data returned in form of statement, where direct access to values are possible.

Definition at line 2480 of file TSQLFile.cxx.

◆ GetDataBaseName()

const char * TSQLFile::GetDataBaseName ( ) const

Return name of data base on the host For Oracle always return 0.

Definition at line 627 of file TSQLFile.cxx.

◆ GetEND()

Long64_t TSQLFile::GetEND ( ) const

inlinefinalvirtual

Reimplemented from TFile.

Definition at line 214 of file TSQLFile.h.

◆ GetErrno()

Int_t TSQLFile::GetErrno ( ) const

inlinefinalvirtual

Method returning errno.

Reimplemented from TFile.

Definition at line 215 of file TSQLFile.h.

◆ GetIOVersion()

Int_t TSQLFile::GetIOVersion ( ) const

inline

Definition at line 196 of file TSQLFile.h.

◆ GetLocking()

Int_t TSQLFile::GetLocking ( )

protected

Return current locking mode for that file.

Definition at line 1348 of file TSQLFile.cxx.

◆ GetLongString()

Bool_t TSQLFile::GetLongString	(	Long64_t	objid,
		Int_t	strid,
		TString &	value
	)

protected

Returns value of string, extracted from special table, where long strings are stored.

Definition at line 2274 of file TSQLFile.cxx.

◆ GetNbytesFree()

Int_t TSQLFile::GetNbytesFree ( ) const

inlinefinalvirtual

Reimplemented from TFile.

Definition at line 221 of file TSQLFile.h.

◆ GetNbytesInfo()

Int_t TSQLFile::GetNbytesInfo ( ) const

inlinefinalvirtual

Reimplemented from TFile.

Definition at line 220 of file TSQLFile.h.

◆ GetNfree()

Int_t TSQLFile::GetNfree ( ) const

inlinefinalvirtual

Reimplemented from TFile.

Definition at line 219 of file TSQLFile.h.

◆ GetNormalClassData()

TSQLResult * TSQLFile::GetNormalClassData	(	Long64_t	objid,
		TSQLClassInfo *	sqlinfo
	)

protected

Method return request result for specified objid from normal classtable.

Definition at line 2435 of file TSQLFile.cxx.

◆ GetNormalClassDataAll()

TSQLResult * TSQLFile::GetNormalClassDataAll	(	Long64_t	minobjid,
		Long64_t	maxobjid,
		TSQLClassInfo *	sqlinfo
	)

protected

Return data for several objects from the range from normal class table.

Definition at line 2449 of file TSQLFile.cxx.

◆ GetQuerisCounter()

Int_t TSQLFile::GetQuerisCounter ( ) const

inline

Definition at line 195 of file TSQLFile.h.

◆ GetSeekFree()

Long64_t TSQLFile::GetSeekFree ( ) const

inlinefinalvirtual

Reimplemented from TFile.

Definition at line 222 of file TSQLFile.h.

◆ GetSeekInfo()

Long64_t TSQLFile::GetSeekInfo ( ) const

inlinefinalvirtual

Reimplemented from TFile.

Definition at line 223 of file TSQLFile.h.

◆ GetSize()

Long64_t TSQLFile::GetSize ( ) const

inlinefinalvirtual

Returns the current file size.

Returns -1 in case the file could not be stat'ed.

Reimplemented from TFile.

Definition at line 224 of file TSQLFile.h.

◆ GetStreamerInfoListImpl()

TFile::InfoListRet TSQLFile::GetStreamerInfoListImpl ( bool )

finalprotectedvirtual

Read back streamer infos from database List of streamer infos is always stored with key:id 0, which is not shown in normal keys list.

Reimplemented from TFile.

Definition at line 882 of file TSQLFile.cxx.

◆ GetTablesType()

const char * TSQLFile::GetTablesType ( ) const

inline

Definition at line 190 of file TSQLFile.h.

◆ GetUseIndexes()

Int_t TSQLFile::GetUseIndexes ( ) const

inline

Definition at line 194 of file TSQLFile.h.

◆ GetUseSuffixes()

Bool_t TSQLFile::GetUseSuffixes ( ) const

inline

Definition at line 184 of file TSQLFile.h.

◆ GetUseTransactions()

Int_t TSQLFile::GetUseTransactions ( ) const

inline

Definition at line 192 of file TSQLFile.h.

◆ HasTable()

Bool_t TSQLFile::HasTable ( const char * name )

protected

Test if table name exists.

Definition at line 1883 of file TSQLFile.cxx.

◆ IncrementModifyCounter()

void TSQLFile::IncrementModifyCounter ( )

protected

Update value of modify counter in config table Modify counter used to indicate that something was changed in database.

It will be used when multiple instances of TSQLFile for the same data base will be connected.

Definition at line 1188 of file TSQLFile.cxx.

◆ InitSqlDatabase()

void TSQLFile::InitSqlDatabase ( Bool_t create )

protected

initialize sql database and correspondent structures identical to TFile::Init() function

Definition at line 998 of file TSQLFile.cxx.

◆ IsA()

TClass * TSQLFile::IsA ( ) const

inlineoverridevirtual

Returns: TClass describing current object

Reimplemented from TFile.

Definition at line 254 of file TSQLFile.h.

◆ IsLongStringCode()

Int_t TSQLFile::IsLongStringCode	(	Long64_t	objid,
		const char *	value
	)

protected

Checks if this is long string code returns 0, if not or string id.

Definition at line 2225 of file TSQLFile.cxx.

◆ IsMySQL()

Bool_t TSQLFile::IsMySQL ( ) const

checks, if MySQL database

Definition at line 467 of file TSQLFile.cxx.

◆ IsODBC()

Bool_t TSQLFile::IsODBC ( ) const

checks, if ODBC driver used for database connection

Definition at line 487 of file TSQLFile.cxx.

◆ IsOpen()

Bool_t TSQLFile::IsOpen ( ) const

finalvirtual

return kTRUE if file is opened and can be accessed

Reimplemented from TFile.

Definition at line 710 of file TSQLFile.cxx.

◆ IsOracle()

Bool_t TSQLFile::IsOracle ( ) const

checks, if Oracle database

Definition at line 477 of file TSQLFile.cxx.

◆ IsReadAccess()

Bool_t TSQLFile::IsReadAccess ( )

protected

dummy, in future should check about read access to database

Definition at line 1372 of file TSQLFile.cxx.

◆ IsTablesExists()

Bool_t TSQLFile::IsTablesExists ( )

protected

Checks if main keys table is existing.

Definition at line 1318 of file TSQLFile.cxx.

◆ IsWriteAccess()

Bool_t TSQLFile::IsWriteAccess ( )

protected

Checkis, if lock is free in configuration tables.

Definition at line 1326 of file TSQLFile.cxx.

◆ MakeFree()

void TSQLFile::MakeFree	(	Long64_t	first,
		Long64_t	last
	)

inlinefinalvirtual

Mark unused bytes on the file.

The list of free segments is in the fFree linked list. When an object is deleted from the file, the freed space is added into the FREE linked list (fFree). The FREE list consists of a chain of consecutive free segments on the file. At the same time, the first 4 bytes of the freed record on the file are overwritten by GAPSIZE where GAPSIZE = -(Number of bytes occupied by the record).

Reimplemented from TFile.

Definition at line 231 of file TSQLFile.h.

◆ MakeProject()

void TSQLFile::MakeProject	(	const char *	dirname,
		const char *	classes = `"*"`,
		Option_t *	option = `"new"`
	)

inlinefinalvirtual

Generate source code necessary to access the objects stored in the file.

Generate code in directory dirname for all classes specified in argument classes If classes = "*" (default and currently the only supported value), the function generates an include file for each class in the StreamerInfo list for which a TClass object does not exist.

The code generated includes:

dirnameProjectHeaders.h, which contains one #include statement per generated header file
dirnameProjectSource.cxx,which contains all the constructors and destructors implementation. and one header per class that is not nested inside another class. The header file name is the fully qualified name of the class after all the special characters "<>,:" are replaced by underscored. For example for std::pair<edm::Vertex,int> the file name is pair_edm__Vertex_int_.h

In the generated classes, map, multimap when the first template parameter is a class are replaced by a vector of pair. set and multiset when the tempalte parameter is a class are replaced by a vector. This is required since we do not have the code needed to order and/or compare the object of the classes. This is a quick explanation of the options available:

Option	Details
new (default)	A new directory dirname is created. If dirname already exist, an error message is printed and the function returns.
recreate	If dirname does not exist, it is created (like in "new"). If dirname already exist, all existing files in dirname are deleted before creating the new files.
update	New classes are added to the existing directory. Existing classes with the same name are replaced by the new definition. If the directory dirname doest not exist, same effect as "new".
genreflex	Use genreflex rather than rootcint to generate the dictionary.
par	Create a PAR file with the minimal set of code needed to read the content of the ROOT file. The name of the PAR file is basename(dirname), with extension '.par' enforced; the PAR file will be created at dirname(dirname).

If, in addition to one of the 3 above options, the option "+" is specified, the function will generate:

a script called MAKEP to build the shared lib
a dirnameLinkDef.h file
rootcint will be run to generate a dirnameProjectDict.cxx file
dirnameProjectDict.cxx will be compiled with the current options in compiledata.h
a shared lib dirname.so will be created. If the option "++" is specified, the generated shared lib is dynamically linked with the current executable module. If the option "+" and "nocompile" are specified, the utility files are generated as in the option "+" but they are not executed. Example: file.MakeProject("demo","*","recreate++");
creates a new directory demo unless it already exist
clear the previous directory content
generate the xxx.h files for all classes xxx found in this file and not yet known to the CINT dictionary.
creates the build script MAKEP
creates a LinkDef.h file
runs rootcint generating demoProjectDict.cxx
compiles demoProjectDict.cxx into demoProjectDict.o
generates a shared lib demo.so
dynamically links the shared lib demo.so to the executable If only the option "+" had been specified, one can still link the shared lib to the current executable module with:
```
gSystem->load("demo/demo.so");
```
The following feature is not yet enabled: One can restrict the list of classes to be generated by using expressions like:
```
classes = "Ali*" generate code only for classes starting with Ali
classes = "myClass" generate code for class MyClass only.
```

Reimplemented from TFile.

Definition at line 232 of file TSQLFile.h.

◆ MakeSelectQuery()

TString TSQLFile::MakeSelectQuery ( TClass * cl )

Produce SELECT statement which can be used to get all data of class cl in one SELECT statement.

This statement also can be used to create VIEW by command like mysql> CREATE VIEW TH1I_view AS $CLASSSELECT$ Where $CLASSSELECT$ argument should be produced by call f->MakeSelectQuery(TH1I::Class()); VIEWs supported by latest MySQL 5 and Oracle

Definition at line 1215 of file TSQLFile.cxx.

◆ Map() [1/2]

void TSQLFile::Map ( )

inlinefinalvirtual

Reimplemented from TFile.

Definition at line 234 of file TSQLFile.h.

◆ Map() [2/2]

void TSQLFile::Map ( Option_t * opt )

inlinefinalvirtual

List the contents of a file sequentially.

For each logical record found, it prints:

Date/Time  Record_Adress Logical_Record_Length  ClassName  CompressionFactor

Example of output

20010404/150437  At:64        N=150       TFile
20010404/150440  At:214       N=28326     TBasket        CX =  1.13
20010404/150440  At:28540     N=29616     TBasket        CX =  1.08
20010404/150440  At:58156     N=29640     TBasket        CX =  1.08
20010404/150440  At:87796     N=29076     TBasket        CX =  1.10
20010404/150440  At:116872    N=10151     TBasket        CX =  3.15
20010404/150441  At:127023    N=28341     TBasket        CX =  1.13
20010404/150441  At:155364    N=29594     TBasket        CX =  1.08
20010404/150441  At:184958    N=29616     TBasket        CX =  1.08
20010404/150441  At:214574    N=29075     TBasket        CX =  1.10
20010404/150441  At:243649    N=9583      TBasket        CX =  3.34
20010404/150442  At:253232    N=28324     TBasket        CX =  1.13
20010404/150442  At:281556    N=29641     TBasket        CX =  1.08
20010404/150442  At:311197    N=29633     TBasket        CX =  1.08
20010404/150442  At:340830    N=29091     TBasket        CX =  1.10
20010404/150442  At:369921    N=10341     TBasket        CX =  3.09
20010404/150442  At:380262    N=509       TH1F           CX =  1.93
20010404/150442  At:380771    N=1769      TH2F           CX =  4.32
20010404/150442  At:382540    N=1849      TProfile       CX =  1.65
20010404/150442  At:384389    N=18434     TNtuple        CX =  4.51
20010404/150442  At:402823    N=307       KeysList
20010404/150443  At:403130    N=4548      StreamerInfo   CX =  3.65
20010404/150443  At:407678    N=86        FreeSegments
20010404/150443  At:407764    N=1         END

If the parameter opt contains "forComp", the Date/Time is omitted and the decompressed size is also printed.

Record_Adress Logical_Record_Length Key_Length Object_Record_Length ClassName CompressionFactor

If the parameter opt contains "extended", the name and title of the keys are added: 20200820/155031 At:100 N=180 TFile name: hsimple.root title: Demo ROOT file with histograms 220200820/155032 At:280 N=28880 TBasket CX = 1.11 name: random title: ntuple 220200820/155032 At:29160 N=29761 TBasket CX = 1.08 name: px title: ntuple 220200820/155032 At:58921 N=29725 TBasket CX = 1.08 name: py title: ntuple 220200820/155032 At:88646 N=29209 TBasket CX = 1.10 name: pz title: ntuple 220200820/155032 At:117855 N=10197 TBasket CX = 3.14 name: i title: ntuple ... 20200820/155032 At:405110 N=808 TNtuple CX = 3.53 name: ntuple title: Demo ntuple 20200820/155706 At:405918 N=307 KeysList name: hsimple.root title: Demo ROOT file with histograms 20200820/155032 At:406225 N=8556 StreamerInfo CX = 3.42 name: StreamerInfo title: Doubly linked list 20200820/155708 At:414781 N=86 FreeSegments name: hsimple.root title: Demo ROOT file with histograms 20200820/155708 At:414867 N=1 END

Note: The combined size of the classname, name and title is truncated to 476 characters (a little more for regular keys of small files)

Reimplemented from TFile.

Definition at line 233 of file TSQLFile.h.

◆ operator=()

void TSQLFile::operator= ( const TSQLFile & )

privatedelete

◆ Paint()

void TSQLFile::Paint ( Option_t * option = "" )

inlinefinalvirtual

Paint all objects in the file.

Reimplemented from TFile.

Definition at line 235 of file TSQLFile.h.

◆ Print()

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

inlinefinalvirtual

Print all objects in the file.

Reimplemented from TFile.

Definition at line 236 of file TSQLFile.h.

◆ ProduceClassSelectQuery()

Bool_t TSQLFile::ProduceClassSelectQuery	(	TVirtualStreamerInfo *	info,
		TSQLClassInfo *	sqlinfo,
		TString &	columns,
		TString &	tables,
		Int_t &	tablecnt
	)

protected

used by MakeClassSelectQuery method to add columns from table of class, specified by TVirtualStreamerInfo structure

Definition at line 1237 of file TSQLFile.cxx.

◆ ReadBuffer() [1/2]

Bool_t TSQLFile::ReadBuffer	(	char *	buf,
		Int_t	len
	)

inlinefinalvirtual

Read a buffer from the file.

This is the basic low level read operation. Returns kTRUE in case of failure.

Reimplemented from TFile.

Definition at line 237 of file TSQLFile.h.

◆ ReadBuffer() [2/2]

Bool_t TSQLFile::ReadBuffer	(	char *	buf,
		Long64_t	pos,
		Int_t	len
	)

inlinefinalvirtual

Read a buffer from the file at the offset 'pos' in the file.

Returns kTRUE in case of failure. Compared to ReadBuffer(char*, Int_t), this routine does not change the cursor on the physical file representation (fD) if the data is in this TFile's cache.

Reimplemented from TFile.

Definition at line 238 of file TSQLFile.h.

◆ ReadConfigurations()

Bool_t TSQLFile::ReadConfigurations ( )

protected

read table configurations as special table

Definition at line 1054 of file TSQLFile.cxx.

◆ ReadFree()

void TSQLFile::ReadFree ( )

inlinefinalvirtual

Read the FREE linked list.

Every file has a linked list (fFree) of free segments. This linked list has been written on the file via WriteFree as a single data record.

Reimplemented from TFile.

Definition at line 239 of file TSQLFile.h.

◆ ReadSpecialObject()

TObject * TSQLFile::ReadSpecialObject	(	Long64_t	keyid,
		TObject *	obj = `nullptr`
	)

protected

Read data of special kind of objects.

Definition at line 851 of file TSQLFile.cxx.

◆ ReadSQLClassInfos()

void TSQLFile::ReadSQLClassInfos ( )

protected

Read all class infos from IdsTable.

Definition at line 1911 of file TSQLFile.cxx.

◆ Recover()

Int_t TSQLFile::Recover ( )

inlinefinalvirtual

Attempt to recover file if not correctly closed.

The function returns the number of keys that have been recovered. If no keys can be recovered, the file will be declared Zombie by the calling function. This function is automatically called when opening a file. If the file is open in read only mode, the file is not modified. If open in update mode and the function finds something to recover, a new directory header is written to the file. When opening the file gain no message from Recover will be reported. If keys have been recovered, the file is usable and you can safely read the corresponding objects. If the file is not usable (a zombie), you can test for this case with code like:

TFile f("myfile.root");

if (f.IsZombie()) {<actions to take if file is unusable>}

TFile

A ROOT file is composed of a header, followed by consecutive data records (TKey instances) with a wel...

Definition TFile.h:53

file

Definition file.py:1

If the file has been recovered, the bit kRecovered is set in the TFile object in memory. You can test if the file has been recovered with

if (f.TestBit(TFile::kRecovered)) {... the file has been recovered}

When writing TTrees to a file, it is important to save the Tree header at regular intervals (see TTree::AutoSave). If a file containing a Tree is recovered, the last Tree header written to the file will be used. In this case all the entries in all the branches written before writing the header are valid entries. One can disable the automatic recovery procedure by setting

TFile.Recover 0

in the system.rootrc file.

Reimplemented from TFile.

Definition at line 240 of file TSQLFile.h.

◆ ReOpen()

Int_t TSQLFile::ReOpen ( Option_t * mode )

finalvirtual

Reopen a file with a different access mode, like from READ to See TFile::Open() for details.

Reimplemented from TFile.

Definition at line 719 of file TSQLFile.cxx.

◆ RequestSQLClassInfo() [1/2]

TSQLClassInfo * TSQLFile::RequestSQLClassInfo	(	const char *	clname,
		Int_t	version
	)

protected

Search in database tables for specified class and return TSQLClassInfo object.

Definition at line 1800 of file TSQLFile.cxx.

◆ RequestSQLClassInfo() [2/2]

TSQLClassInfo * TSQLFile::RequestSQLClassInfo ( const TClass * cl )

protected

Search in database tables for specified class and return TSQLClassInfo object.

Definition at line 1903 of file TSQLFile.cxx.

◆ ResetErrno()

void TSQLFile::ResetErrno ( ) const

inlinefinalvirtual

Method resetting the errno.

Reimplemented from TFile.

Definition at line 216 of file TSQLFile.h.

◆ Rollback()

Bool_t TSQLFile::Rollback ( )

Rollback all operations, done after StartTransaction() call.

Database should return to initial state.

Definition at line 593 of file TSQLFile.cxx.

◆ SaveToDatabase()

void TSQLFile::SaveToDatabase ( )

protected

save data which is not yet in Database Typically this is streamerinfos structures or

Definition at line 906 of file TSQLFile.cxx.

◆ Seek()

void TSQLFile::Seek	(	Long64_t	offset,
		ERelativeTo	pos = `kBeg`
	)

inlinefinalvirtual

Seek to a specific position in the file. Pos it either kBeg, kCur or kEnd.

Reimplemented from TFile.

Definition at line 242 of file TSQLFile.h.

◆ SetArrayLimit()

void TSQLFile::SetArrayLimit ( Int_t limit = 20 )

Defines maximum number of columns for array representation If array size bigger than limit, array data will be converted to raw format This is usefull to prevent tables with very big number of columns If limit==0, all arrays will be stored in raw format If limit<0, all array values will be stored in column form Default value is 21.

Definition at line 514 of file TSQLFile.cxx.

◆ SetEND()

void TSQLFile::SetEND ( Long64_t )

inlinefinalvirtual

Reimplemented from TFile.

Definition at line 244 of file TSQLFile.h.

◆ SetLocking()

void TSQLFile::SetLocking ( Int_t mode )

protected

Set locking mode for current database.

Definition at line 1334 of file TSQLFile.cxx.

◆ SetTablesType()

void TSQLFile::SetTablesType ( const char * tables_type )

Defines tables type, which is used in CREATE TABLE statements Now is only used for MySQL database, where following types are supported: "BDB", "HEAP", "ISAM", "InnoDB", "MERGE", "MRG_MYISAM", "MYISAM" Default for TSQLFile is "InnoDB".

For more detailes see MySQL docs.

Definition at line 528 of file TSQLFile.cxx.

◆ SetUseIndexes()

void TSQLFile::SetUseIndexes ( Int_t use_type = kIndexesBasic )

Specify usage of indexes for data tables.

Index	Description
kIndexesNone = 0	no indexes are used
kIndexesBasic = 1	indexes used only for keys list and objects list tables (default)
kIndexesClass = 2	index also created for every normal class table
kIndexesAll = 3	index created for every table, including streamer tables

Indexes in general should increase speed of access to objects data, but they required more operations and more disk space on server side

Definition at line 615 of file TSQLFile.cxx.

◆ SetUseSuffixes()

void TSQLFile::SetUseSuffixes ( Bool_t on = kTRUE )

enable/disable uasge of suffixes in columns names can be changed before first object is saved into file

Definition at line 498 of file TSQLFile.cxx.

◆ SetUseTransactions()

void TSQLFile::SetUseTransactions ( Int_t mode = kTransactionsAuto )

Defines usage of transactions statements for writing objects data to database.

| Index | Description | |----—|----------—| | kTransactionsOff=0 - no transaction operation are allowed | | kTransactionsAuto=1 - automatic mode. Each write operation, produced by TSQLFile, will be supplied by START TRANSACTION and COMMIT calls. If any error happen, ROLLBACK will returns database to previous state | | kTransactionsUser=2 - transactions are delegated to user. Methods StartTransaction(), Commit() and Rollback() should be called by user. |

Default UseTransactions option is kTransactionsAuto

Definition at line 548 of file TSQLFile.cxx.

◆ Sizeof()

Int_t TSQLFile::Sizeof ( ) const

inlinefinalvirtual

Return the size in bytes of the file header.

Reimplemented from TFile.

Definition at line 245 of file TSQLFile.h.

◆ SkipArrayLimit()

void TSQLFile::SkipArrayLimit ( )

inline

Definition at line 188 of file TSQLFile.h.

◆ SQLApplyCommands()

Bool_t TSQLFile::SQLApplyCommands ( TObjArray * cmds )

protected

supplies set of commands to server Commands is stored as array of TObjString

Definition at line 1473 of file TSQLFile.cxx.

◆ SQLBigTextType()

const char * TSQLFile::SQLBigTextType ( ) const

inlineprotected

Definition at line 134 of file TSQLFile.h.

◆ SQLCanStatement()

Bool_t TSQLFile::SQLCanStatement ( )

protected

Test if DB support statement and number of open statements is not exceeded.

Definition at line 1425 of file TSQLFile.cxx.

◆ SQLCommit()

Bool_t TSQLFile::SQLCommit ( )

protected

Commit SQL transaction.

Definition at line 1581 of file TSQLFile.cxx.

◆ SQLCompatibleType()

const char * TSQLFile::SQLCompatibleType ( Int_t typ ) const

protected

Returns sql type name which is most closer to ROOT basic type.

typ should be from TVirtualStreamerInfo:: constansts like TVirtualStreamerInfo::kInt

Definition at line 2566 of file TSQLFile.cxx.

◆ SQLDatetimeType()

const char * TSQLFile::SQLDatetimeType ( ) const

inlineprotected

Definition at line 135 of file TSQLFile.h.

◆ SQLDefaultTableType()

const char * TSQLFile::SQLDefaultTableType ( ) const

inlineprotected

Definition at line 144 of file TSQLFile.h.

◆ SQLDeleteAllTables()

void TSQLFile::SQLDeleteAllTables ( )

protected

Delete all tables in database.

Definition at line 1549 of file TSQLFile.cxx.

◆ SQLDeleteStatement()

void TSQLFile::SQLDeleteStatement ( TSQLStatement * stmt )

protected

delete statement and decrease counter

Definition at line 1459 of file TSQLFile.cxx.

◆ SQLDirIdColumn()

const char * TSQLFile::SQLDirIdColumn ( ) const

inlineprotected

Definition at line 137 of file TSQLFile.h.

◆ SQLIdentifierQuote()

const char * TSQLFile::SQLIdentifierQuote ( ) const

inlineprotected

Definition at line 136 of file TSQLFile.h.

◆ SQLIntType()

const char * TSQLFile::SQLIntType ( ) const

protected

return SQL integer type

Definition at line 2574 of file TSQLFile.cxx.

◆ SQLKeyIdColumn()

const char * TSQLFile::SQLKeyIdColumn ( ) const

inlineprotected

Definition at line 138 of file TSQLFile.h.

◆ SQLMaxIdentifierLength()

Int_t TSQLFile::SQLMaxIdentifierLength ( )

protected

returns maximum allowed length of identifiers

Definition at line 1597 of file TSQLFile.cxx.

◆ SQLMaximumValue()

Long64_t TSQLFile::SQLMaximumValue	(	const char *	tablename,
		const char *	columnname
	)

protected

Returns maximum value, found in specified columnname of table tablename Column type should be numeric.

Definition at line 1513 of file TSQLFile.cxx.

◆ SQLNameSeparator()

const char * TSQLFile::SQLNameSeparator ( ) const

inlineprotected

Definition at line 142 of file TSQLFile.h.

◆ SQLObjectIdColumn()

const char * TSQLFile::SQLObjectIdColumn ( ) const

inlineprotected

Definition at line 139 of file TSQLFile.h.

◆ SQLObjectInfo()

Bool_t TSQLFile::SQLObjectInfo	(	Long64_t	objid,
		TString &	clname,
		Version_t &	version
	)

protected

Read from objects table data for specified objectid.

Definition at line 2344 of file TSQLFile.cxx.

◆ SQLObjectsInfo()

TObjArray * TSQLFile::SQLObjectsInfo ( Long64_t keyid )

protected

Produce array of TSQLObjectInfo objects for all objects, belong to that key Array should be deleted by calling function afterwards.

Definition at line 2371 of file TSQLFile.cxx.

◆ SQLQuery()

TSQLResult * TSQLFile::SQLQuery	(	const char *	cmd,
		Int_t	flag = `0`,
		Bool_t *	ok = `nullptr`
	)

protected

Submits query to SQL server.

Flag Value	Effect
0	result is not interesting and will be deleted
1	return result of submitted query
2	results is may be necessary for long time Oracle plugin do not support working with several TSQLResult

objects, therefore explicit deep copy will be produced|

If ok!=0, it will contains kTRUE is Query was successful, otherwise kFALSE

Definition at line 1389 of file TSQLFile.cxx.

◆ SQLRawIdColumn()

const char * TSQLFile::SQLRawIdColumn ( ) const

inlineprotected

Definition at line 140 of file TSQLFile.h.

◆ SQLRollback()

Bool_t TSQLFile::SQLRollback ( )

protected

Rollback all SQL operations, done after start transaction.

Definition at line 1589 of file TSQLFile.cxx.

◆ SQLSmallTextType()

const char * TSQLFile::SQLSmallTextType ( ) const

inlineprotected

Definition at line 132 of file TSQLFile.h.

◆ SQLSmallTextTypeLimit()

Int_t TSQLFile::SQLSmallTextTypeLimit ( ) const

inlineprotected

Definition at line 133 of file TSQLFile.h.

◆ SQLStartTransaction()

Bool_t TSQLFile::SQLStartTransaction ( )

protected

Start SQL transaction.

Definition at line 1573 of file TSQLFile.cxx.

◆ SQLStatement()

TSQLStatement * TSQLFile::SQLStatement	(	const char *	cmd,
		Int_t	bufsize = `1000`
	)

protected

Produces SQL statement for currently conected DB server.

Definition at line 1439 of file TSQLFile.cxx.

◆ SQLStrIdColumn()

const char * TSQLFile::SQLStrIdColumn ( ) const

inlineprotected

Definition at line 141 of file TSQLFile.h.

◆ SQLTestTable()

Bool_t TSQLFile::SQLTestTable ( const char * tablename )

protected

Test, if table of specified name exists.

Definition at line 1493 of file TSQLFile.cxx.

◆ SQLValueQuote()

const char * TSQLFile::SQLValueQuote ( ) const

inlineprotected

Definition at line 143 of file TSQLFile.h.

◆ StartLogFile()

void TSQLFile::StartLogFile ( const char * fname )

start logging of all SQL statements in specified file

Definition at line 447 of file TSQLFile.cxx.

◆ StartTransaction()

Bool_t TSQLFile::StartTransaction ( )

Start user transaction.

This can be usesful, when big number of objects should be stored in data base and commitment required only if all operations were successful. In that case in the end of all operations method Commit() should be called. If operation on user-level is looks like not successful, method Rollback() will return database data and TSQLFile instance to previous state. In MySQL not all tables types support transaction mode of operation. See SetTablesType() method for details .

Definition at line 565 of file TSQLFile.cxx.

◆ StopLogFile()

void TSQLFile::StopLogFile ( )

close logging file

Definition at line 456 of file TSQLFile.cxx.

◆ StoreObjectInTables()

Long64_t TSQLFile::StoreObjectInTables	(	Long64_t	keyid,
		const void *	obj,
		const TClass *	cl
	)

protected

Store object in database. Return stored object id or -1 if error.

Definition at line 2511 of file TSQLFile.cxx.

◆ Streamer()

void TSQLFile::Streamer ( TBuffer & b )

overridevirtual

Streamer for TSQLFile class.

Stores only data for TDirectory.

Reimplemented from TFile.

Definition at line 2668 of file TSQLFile.cxx.

◆ StreamerNVirtual()

void TSQLFile::StreamerNVirtual ( TBuffer & ClassDef_StreamerNVirtual_b )

inline

Definition at line 254 of file TSQLFile.h.

◆ StreamKeysForDirectory()

Int_t TSQLFile::StreamKeysForDirectory	(	TDirectory *	dir,
		Bool_t	doupdate,
		Long64_t	specialkeyid = `-1`,
		TKeySQL **	specialkey = `nullptr`
	)

protected

read keys for specified directory (when update == kFALSE) or update value for modified keys when update == kTRUE Returns number of successfully read keys or -1 if error

Definition at line 920 of file TSQLFile.cxx.

◆ SysClose()

Int_t TSQLFile::SysClose ( Int_t fd )

inlinefinalprotectedvirtual

Interface to system close. All arguments like in POSIX close().

Reimplemented from TFile.

Definition at line 45 of file TSQLFile.h.

◆ SysOpen()

Int_t TSQLFile::SysOpen	(	const char *	pathname,
		Int_t	flags,
		UInt_t	mode
	)

inlinefinalprotectedvirtual

Interface to system open. All arguments like in POSIX open().

Reimplemented from TFile.

Definition at line 44 of file TSQLFile.h.

◆ SysRead()

Int_t TSQLFile::SysRead	(	Int_t	fd,
		void *	buf,
		Int_t	len
	)

inlinefinalprotectedvirtual

Interface to system read. All arguments like in POSIX read().

Reimplemented from TFile.

Definition at line 46 of file TSQLFile.h.

◆ SysSeek()

Long64_t TSQLFile::SysSeek	(	Int_t	fd,
		Long64_t	offset,
		Int_t	whence
	)

inlinefinalprotectedvirtual

Interface to system lseek.

All arguments like in POSIX lseek() except that the offset and return value are of a type which are able to handle 64 bit file systems.

Reimplemented from TFile.

Definition at line 48 of file TSQLFile.h.

◆ SysStat()

Int_t TSQLFile::SysStat	(	Int_t	fd,
		Long_t *	id,
		Long64_t *	size,
		Long_t *	flags,
		Long_t *	modtime
	)

inlinefinalprotectedvirtual

Return file stat information.

The interface and return value is identical to TSystem::GetPathInfo(). The function returns 0 in case of success and 1 if the file could not be stat'ed.

Reimplemented from TFile.

Definition at line 49 of file TSQLFile.h.

◆ SysSync()

Int_t TSQLFile::SysSync ( Int_t fd )

inlinefinalprotectedvirtual

Interface to system fsync. All arguments like in POSIX fsync().

Reimplemented from TFile.

Definition at line 50 of file TSQLFile.h.

◆ SysWrite()

Int_t TSQLFile::SysWrite	(	Int_t	fd,
		const void *	buf,
		Int_t	len
	)

inlinefinalprotectedvirtual

Interface to system write. All arguments like in POSIX write().

Reimplemented from TFile.

Definition at line 47 of file TSQLFile.h.

◆ UpdateKeyData()

Bool_t TSQLFile::UpdateKeyData ( TKeySQL * key )

protected

Updates (overwrites) key data in KeysTable.

Definition at line 1722 of file TSQLFile.cxx.

◆ VerifyLongStringTable()

Bool_t TSQLFile::VerifyLongStringTable ( )

protected

Checks that table for big strings is exists If not, will be created.

Definition at line 2187 of file TSQLFile.cxx.

◆ VerifyObjectTable()

Long64_t TSQLFile::VerifyObjectTable ( )

protected

Checks that objects table is exists If not, table will be created Returns maximum value for existing objects id.

Definition at line 2305 of file TSQLFile.cxx.

◆ Write() [1/2]

Int_t TSQLFile::Write	(	const char *	name = `nullptr`,
		Int_t	opt = `0`,
		Int_t	bufsiz = `0`
	)		const

inlinefinalvirtual

One can not save a const TDirectory object.

Reimplemented from TFile.

Definition at line 249 of file TSQLFile.h.

◆ Write() [2/2]

Int_t TSQLFile::Write	(	const char *	name = `nullptr`,
		Int_t	opt = `0`,
		Int_t	bufsiz = `0`
	)

inlinefinalvirtual

Write memory objects to this file.

Loop on all objects in memory (including subdirectories). A new key is created in the KEYS linked list for each object. The list of keys is then saved on the file (via WriteKeys) as a single data record. For values of opt see TObject::Write(). The directory header info is rewritten on the directory header record. The linked list of FREE segments is written. The file header is written (bytes 1->fBEGIN).

Reimplemented from TFile.

Definition at line 248 of file TSQLFile.h.

◆ WriteBuffer()

Bool_t TSQLFile::WriteBuffer	(	const char *	buf,
		Int_t	len
	)

inlinefinalvirtual

Write a buffer to the file.

This is the basic low level write operation. Returns kTRUE in case of failure.

Reimplemented from TFile.

Definition at line 247 of file TSQLFile.h.

◆ WriteFree()

void TSQLFile::WriteFree ( )

inlinefinalvirtual

Write FREE linked list on the file.

The linked list of FREE segments (fFree) is written as a single data record.

Reimplemented from TFile.

Definition at line 250 of file TSQLFile.h.

◆ WriteHeader()

void TSQLFile::WriteHeader ( )

finalvirtual

Write file info like configurations, title, UUID and other.

Reimplemented from TFile.

Definition at line 782 of file TSQLFile.cxx.

◆ WriteKeyData()

Bool_t TSQLFile::WriteKeyData ( TKeySQL * key )

protected

Add entry into keys table.

Definition at line 1691 of file TSQLFile.cxx.

◆ WriteSpecialObject()

Bool_t TSQLFile::WriteSpecialObject	(	Long64_t	keyid,
		TObject *	obj,
		const char *	name,
		const char *	title
	)

protected

write special kind of object like streamer infos or file itself keys for that objects should exist in tables but not indicated in list of keys, therefore users can not get them with TDirectoryFile::Get() method

Definition at line 829 of file TSQLFile.cxx.

◆ WriteStreamerInfo()

void TSQLFile::WriteStreamerInfo ( )

finalvirtual

Store all TVirtualStreamerInfo, used in file, in sql database.

Reimplemented from TFile.

Definition at line 790 of file TSQLFile.cxx.

Friends And Related Symbol Documentation

◆ TBufferSQL2

friend class TBufferSQL2

friend

Definition at line 32 of file TSQLFile.h.

◆ TKeySQL

friend class TKeySQL

friend

Definition at line 33 of file TSQLFile.h.

◆ TSqlCmdsBuffer

friend class TSqlCmdsBuffer

friend

Definition at line 38 of file TSQLFile.h.

◆ TSqlRawBuffer

friend class TSqlRawBuffer

friend

Definition at line 37 of file TSQLFile.h.

◆ TSqlRegistry

friend class TSqlRegistry

friend

Definition at line 36 of file TSQLFile.h.

◆ TSQLStructure

friend class TSQLStructure

friend

Definition at line 34 of file TSQLFile.h.

◆ TSQLTableData

friend class TSQLTableData

friend

Definition at line 35 of file TSQLFile.h.

Member Data Documentation

◆ fArrayLimit

Int_t TSQLFile::fArrayLimit

protected

! limit for array size. when array bigger, its content converted to raw format

Definition at line 152 of file TSQLFile.h.

◆ fBasicTypes

const char** TSQLFile::fBasicTypes

protected

! pointer on list of basic types specific for currently connected SQL server

Definition at line 160 of file TSQLFile.h.

◆ fCanChangeConfig

Bool_t TSQLFile::fCanChangeConfig

protected

! variable indicates can be basic configuration changed or not

Definition at line 153 of file TSQLFile.h.

◆ fIdsTableExists

Bool_t TSQLFile::fIdsTableExists

protected

! indicate if IdsTable exists

Definition at line 167 of file TSQLFile.h.

◆ fLogFile

std::ofstream* TSQLFile::fLogFile

protected

! log file with SQL statements

Definition at line 165 of file TSQLFile.h.

◆ fModifyCounter

Int_t TSQLFile::fModifyCounter

protected

! indicates how many changes was done with database tables

Definition at line 157 of file TSQLFile.h.

◆ fOtherTypes

const char** TSQLFile::fOtherTypes

protected

! pointer on list of other SQL types like TEXT or blob

Definition at line 161 of file TSQLFile.h.

◆ fQuerisCounter

Int_t TSQLFile::fQuerisCounter

protected

! how many query was applied

Definition at line 158 of file TSQLFile.h.

◆ fSQL

TSQLServer* TSQLFile::fSQL

protected

! interface to SQL database

Definition at line 146 of file TSQLFile.h.

◆ fSQLClassInfos

TList* TSQLFile::fSQLClassInfos

protected

! list of SQL class infos

Definition at line 148 of file TSQLFile.h.

◆ fSQLIOversion

Int_t TSQLFile::fSQLIOversion

protected

! version of SQL I/O which is stored in configurations

Definition at line 151 of file TSQLFile.h.

◆ fStmtCounter

Int_t TSQLFile::fStmtCounter

protected

! count numbers of active statements

Definition at line 168 of file TSQLFile.h.

◆ fTablesType

TString TSQLFile::fTablesType

protected

! type, used in CREATE TABLE statements

Definition at line 154 of file TSQLFile.h.

◆ fUseIndexes

Int_t TSQLFile::fUseIndexes

protected

! use indexes for tables: 0 - off, 1 - only for basic tables, 2 + normal class tables, 3 - all tables

Definition at line 156 of file TSQLFile.h.

◆ fUserName

TString TSQLFile::fUserName

protected

! user name, used to access objects from database

Definition at line 163 of file TSQLFile.h.

◆ fUseSuffixes

Bool_t TSQLFile::fUseSuffixes

protected

! use suffixes in column names like fValue:Int_t or fObject:pointer

Definition at line 150 of file TSQLFile.h.

◆ fUseTransactions

Int_t TSQLFile::fUseTransactions

protected

! use transaction statements for writing data into the tables

Definition at line 155 of file TSQLFile.h.

Libraries for TSQLFile:

[legend]

The documentation for this class was generated from the following files:

io/sql/inc/TSQLFile.h
io/sql/src/TSQLFile.cxx

Example how TSQLFile can be used

A session saving data to a SQL data base

A session read data from SQL data base

Public Types

Public Member Functions

Static Public Member Functions

Protected Types

Protected Member Functions

Protected Attributes

Private Member Functions

Friends

Additional Inherited Members

Member Enumeration Documentation

◆ EIndexesKinds

◆ ELockingKinds

◆ ETransactionKinds

Constructor & Destructor Documentation

◆ TSQLFile() [1/3]

◆ TSQLFile() [2/3]

◆ TSQLFile() [3/3]

◆ ~TSQLFile()

Member Function Documentation

◆ AddIdEntry()

◆ Class()

◆ Class_Name()

◆ Class_Version()

◆ Close()

◆ CodeLongString()

◆ Commit()

◆ CreateBasicTables()

◆ CreateClassTable()

◆ CreateKey() [1/2]

◆ CreateKey() [2/2]

◆ CreateRawTable()

◆ DeclFileName()

◆ DefineNextKeyId()

◆ DefineTableName()

◆ DeleteKeyFromDB()

◆ DirCreateEntry()

◆ DirReadKeys()

◆ DirWriteHeader()

◆ DirWriteKeys()

◆ DrawMap()

◆ FillBuffer()

◆ FindSQLClassInfo() [1/2]

◆ FindSQLClassInfo() [2/2]

◆ FindSQLKey()

◆ Flush()

◆ GetArrayLimit()

◆ GetBlobClassData()

◆ GetBlobClassDataStmt()

◆ GetDataBaseName()

◆ GetEND()

◆ GetErrno()

◆ GetIOVersion()

◆ GetLocking()

◆ GetLongString()

◆ GetNbytesFree()

◆ GetNbytesInfo()

◆ GetNfree()

◆ GetNormalClassData()

◆ GetNormalClassDataAll()

◆ GetQuerisCounter()

◆ GetSeekFree()

◆ GetSeekInfo()

◆ GetSize()

◆ GetStreamerInfoListImpl()

◆ GetTablesType()

◆ GetUseIndexes()

◆ GetUseSuffixes()

◆ GetUseTransactions()

◆ HasTable()

◆ IncrementModifyCounter()

◆ InitSqlDatabase()

◆ IsA()

◆ IsLongStringCode()

◆ IsMySQL()

◆ IsODBC()

◆ IsOpen()

◆ IsOracle()