vtkSQLGraphReader Class Reference

read a vtkGraph from a database More...

#include <vtkSQLGraphReader.h>

Inheritance diagram for vtkSQLGraphReader:

Collaboration diagram for vtkSQLGraphReader:

Public Types
typedef vtkGraphAlgorithm	Superclass
Public Types inherited from vtkGraphAlgorithm
typedef vtkAlgorithm	Superclass
Public Types inherited from vtkAlgorithm
typedef vtkObject	Superclass
enum	DesiredOutputPrecision { SINGLE_PRECISION, DOUBLE_PRECISION, DEFAULT_PRECISION }
Public Types inherited from vtkObject
typedef vtkObjectBase	Superclass

Public Member Functions
virtual int	IsA (const char *type)
vtkSQLGraphReader *	NewInstance () const
void	PrintSelf (ostream &os, vtkIndent indent)
virtual void	SetDirected (bool)
virtual bool	GetDirected ()
virtual void	DirectedOn ()
virtual void	DirectedOff ()
virtual void	SetVertexQuery (vtkSQLQuery *q)
virtual vtkSQLQuery *	GetVertexQuery ()
virtual void	SetEdgeQuery (vtkSQLQuery *q)
virtual vtkSQLQuery *	GetEdgeQuery ()
virtual void	SetSourceField (const char *)
virtual char *	GetSourceField ()
virtual void	SetTargetField (const char *)
virtual char *	GetTargetField ()
virtual void	SetVertexIdField (const char *)
virtual char *	GetVertexIdField ()
virtual void	SetXField (const char *)
virtual char *	GetXField ()
virtual void	SetYField (const char *)
virtual char *	GetYField ()
virtual void	SetZField (const char *)
virtual char *	GetZField ()
virtual void	SetCollapseEdges (bool)
virtual bool	GetCollapseEdges ()
virtual void	CollapseEdgesOn ()
virtual void	CollapseEdgesOff ()
Public Member Functions inherited from vtkGraphAlgorithm
vtkGraphAlgorithm *	NewInstance () const
virtual int	ProcessRequest (vtkInformation *, vtkInformationVector **, vtkInformationVector *)
vtkGraph *	GetOutput ()
vtkGraph *	GetOutput (int index)
void	SetInputData (vtkDataObject *obj)
void	SetInputData (int index, vtkDataObject *obj)
Public Member Functions inherited from vtkAlgorithm
vtkAlgorithm *	NewInstance () const
int	HasExecutive ()
vtkExecutive *	GetExecutive ()
virtual void	SetExecutive (vtkExecutive *executive)
virtual int	ModifyRequest (vtkInformation *request, int when)
vtkInformation *	GetInputPortInformation (int port)
vtkInformation *	GetOutputPortInformation (int port)
int	GetNumberOfInputPorts ()
int	GetNumberOfOutputPorts ()
void	UpdateProgress (double amount)
vtkInformation *	GetInputArrayInformation (int idx)
void	RemoveAllInputs ()
vtkDataObject *	GetOutputDataObject (int port)
virtual void	RemoveInputConnection (int port, vtkAlgorithmOutput *input)
virtual void	RemoveInputConnection (int port, int idx)
virtual void	RemoveAllInputConnections (int port)
int	GetNumberOfInputConnections (int port)
int	GetTotalNumberOfInputConnections ()
vtkAlgorithmOutput *	GetInputConnection (int port, int index)
vtkAlgorithm *	GetInputAlgorithm (int port, int index, int &algPort)
vtkAlgorithm *	GetInputAlgorithm (int port, int index)
vtkExecutive *	GetInputExecutive (int port, int index)
vtkInformation *	GetInputInformation (int port, int index)
vtkInformation *	GetOutputInformation (int port)
virtual void	UpdateInformation ()
virtual void	UpdateDataObject ()
virtual void	PropagateUpdateExtent ()
virtual void	UpdateWholeExtent ()
void	ConvertTotalInputToPortConnection (int ind, int &port, int &conn)
int	SetUpdateExtentToWholeExtent (int port)
int	SetUpdateExtentToWholeExtent ()
void	SetUpdateExtent (int port, int extent[6])
int	ProcessRequest (vtkInformation *request, vtkCollection *inInfo, vtkInformationVector *outInfo)
virtual int	ComputePipelineMTime (vtkInformation *request, vtkInformationVector **inInfoVec, vtkInformationVector *outInfoVec, int requestFromOutputPort, unsigned long *mtime)
virtual vtkInformation *	GetInformation ()
virtual void	SetInformation (vtkInformation *)
virtual void	Register (vtkObjectBase *o)
virtual void	UnRegister (vtkObjectBase *o)
virtual void	SetAbortExecute (int)
virtual int	GetAbortExecute ()
virtual void	AbortExecuteOn ()
virtual void	AbortExecuteOff ()
virtual void	SetProgress (double)
virtual double	GetProgress ()
void	SetProgressText (const char *ptext)
virtual char *	GetProgressText ()
virtual unsigned long	GetErrorCode ()
virtual void	SetInputArrayToProcess (int idx, int port, int connection, int fieldAssociation, const char *name)
virtual void	SetInputArrayToProcess (int idx, int port, int connection, int fieldAssociation, int fieldAttributeType)
virtual void	SetInputArrayToProcess (int idx, vtkInformation *info)
virtual void	SetInputArrayToProcess (int idx, int port, int connection, const char *fieldAssociation, const char *attributeTypeorName)
vtkDataObject *	GetInputDataObject (int port, int connection)
virtual void	SetInputConnection (int port, vtkAlgorithmOutput *input)
virtual void	SetInputConnection (vtkAlgorithmOutput *input)
virtual void	AddInputConnection (int port, vtkAlgorithmOutput *input)
virtual void	AddInputConnection (vtkAlgorithmOutput *input)
virtual void	SetInputDataObject (int port, vtkDataObject *data)
virtual void	SetInputDataObject (vtkDataObject *data)
virtual void	AddInputDataObject (int port, vtkDataObject *data)
virtual void	AddInputDataObject (vtkDataObject *data)
vtkAlgorithmOutput *	GetOutputPort (int index)
vtkAlgorithmOutput *	GetOutputPort ()
vtkAlgorithm *	GetInputAlgorithm ()
vtkExecutive *	GetInputExecutive ()
vtkInformation *	GetInputInformation ()
virtual void	Update (int port)
virtual void	Update ()
virtual void	SetReleaseDataFlag (int)
virtual int	GetReleaseDataFlag ()
void	ReleaseDataFlagOn ()
void	ReleaseDataFlagOff ()
int	UpdateExtentIsEmpty (vtkInformation *pinfo, vtkDataObject *output)
int	UpdateExtentIsEmpty (vtkInformation *pinfo, int extentType)
void	SetUpdateExtent (int port, int piece, int numPieces, int ghostLevel)
void	SetUpdateExtent (int piece, int numPieces, int ghostLevel)
void	SetUpdateExtent (int extent[6])
int *	GetUpdateExtent ()
int *	GetUpdateExtent (int port)
void	GetUpdateExtent (int &x0, int &x1, int &y0, int &y1, int &z0, int &z1)
void	GetUpdateExtent (int port, int &x0, int &x1, int &y0, int &y1, int &z0, int &z1)
void	GetUpdateExtent (int extent[6])
void	GetUpdateExtent (int port, int extent[6])
int	GetUpdatePiece ()
int	GetUpdatePiece (int port)
int	GetUpdateNumberOfPieces ()
int	GetUpdateNumberOfPieces (int port)
int	GetUpdateGhostLevel ()
int	GetUpdateGhostLevel (int port)
void	SetProgressObserver (vtkProgressObserver *)
virtual vtkProgressObserver *	GetProgressObserver ()
Public Member Functions inherited from vtkObject
vtkObject *	NewInstance () const
virtual void	DebugOn ()
virtual void	DebugOff ()
bool	GetDebug ()
void	SetDebug (bool debugFlag)
virtual void	Modified ()
virtual unsigned long	GetMTime ()
unsigned long	AddObserver (unsigned long event, vtkCommand *, float priority=0.0f)
unsigned long	AddObserver (const char *event, vtkCommand *, float priority=0.0f)
vtkCommand *	GetCommand (unsigned long tag)
void	RemoveObserver (vtkCommand *)
void	RemoveObservers (unsigned long event, vtkCommand *)
void	RemoveObservers (const char *event, vtkCommand *)
int	HasObserver (unsigned long event, vtkCommand *)
int	HasObserver (const char *event, vtkCommand *)
void	RemoveObserver (unsigned long tag)
void	RemoveObservers (unsigned long event)
void	RemoveObservers (const char *event)
void	RemoveAllObservers ()
int	HasObserver (unsigned long event)
int	HasObserver (const char *event)
template<class U , class T >
unsigned long	AddObserver (unsigned long event, U observer, void(T::*callback)(), float priority=0.0f)
template<class U , class T >
unsigned long	AddObserver (unsigned long event, U observer, void(T::*callback)(vtkObject *, unsigned long, void *), float priority=0.0f)
template<class U , class T >
unsigned long	AddObserver (unsigned long event, U observer, bool(T::*callback)(vtkObject *, unsigned long, void *), float priority=0.0f)
int	InvokeEvent (unsigned long event, void *callData)
int	InvokeEvent (const char *event, void *callData)
int	InvokeEvent (unsigned long event)
int	InvokeEvent (const char *event)
Public Member Functions inherited from vtkObjectBase
const char *	GetClassName () const
virtual void	Delete ()
virtual void	FastDelete ()
void	Print (ostream &os)
void	SetReferenceCount (int)
void	PrintRevisions (ostream &)
virtual void	PrintHeader (ostream &os, vtkIndent indent)
virtual void	PrintTrailer (ostream &os, vtkIndent indent)
int	GetReferenceCount ()

Static Public Member Functions
static vtkSQLGraphReader *	New ()
static int	IsTypeOf (const char *type)
static vtkSQLGraphReader *	SafeDownCast (vtkObjectBase *o)
Static Public Member Functions inherited from vtkGraphAlgorithm
static vtkGraphAlgorithm *	New ()
static int	IsTypeOf (const char *type)
static vtkGraphAlgorithm *	SafeDownCast (vtkObjectBase *o)
Static Public Member Functions inherited from vtkAlgorithm
static vtkAlgorithm *	New ()
static int	IsTypeOf (const char *type)
static vtkAlgorithm *	SafeDownCast (vtkObjectBase *o)
static vtkInformationIntegerKey *	INPUT_IS_OPTIONAL ()
static vtkInformationIntegerKey *	INPUT_IS_REPEATABLE ()
static vtkInformationInformationVectorKey *	INPUT_REQUIRED_FIELDS ()
static vtkInformationStringVectorKey *	INPUT_REQUIRED_DATA_TYPE ()
static vtkInformationInformationVectorKey *	INPUT_ARRAYS_TO_PROCESS ()
static vtkInformationIntegerKey *	INPUT_PORT ()
static vtkInformationIntegerKey *	INPUT_CONNECTION ()
static vtkInformationIntegerKey *	CAN_PRODUCE_SUB_EXTENT ()
static vtkInformationIntegerKey *	CAN_HANDLE_PIECE_REQUEST ()
static void	SetDefaultExecutivePrototype (vtkExecutive *proto)
Static Public Member Functions inherited from vtkObject
static int	IsTypeOf (const char *type)
static vtkObject *	SafeDownCast (vtkObjectBase *o)
static vtkObject *	New ()
static void	BreakOnError ()
static void	SetGlobalWarningDisplay (int val)
static void	GlobalWarningDisplayOn ()
static void	GlobalWarningDisplayOff ()
static int	GetGlobalWarningDisplay ()
Static Public Member Functions inherited from vtkObjectBase
static int	IsTypeOf (const char *name)
static vtkObjectBase *	New ()

Protected Member Functions
virtual vtkObjectBase *	NewInstanceInternal () const
	vtkSQLGraphReader ()
	~vtkSQLGraphReader ()
virtual int	RequestData (vtkInformation *, vtkInformationVector **, vtkInformationVector *)
virtual int	RequestDataObject (vtkInformation *, vtkInformationVector **, vtkInformationVector *)
Protected Member Functions inherited from vtkGraphAlgorithm
	vtkGraphAlgorithm ()
	~vtkGraphAlgorithm ()
virtual int	RequestInformation (vtkInformation *request, vtkInformationVector **inputVector, vtkInformationVector *outputVector)
virtual int	FillOutputPortInformation (int port, vtkInformation *info)
virtual int	FillInputPortInformation (int port, vtkInformation *info)
virtual int	RequestUpdateExtent (vtkInformation *, vtkInformationVector **, vtkInformationVector *)
Protected Member Functions inherited from vtkAlgorithm
	vtkAlgorithm ()
	~vtkAlgorithm ()
virtual void	SetNumberOfInputPorts (int n)
virtual void	SetNumberOfOutputPorts (int n)
int	InputPortIndexInRange (int index, const char *action)
int	OutputPortIndexInRange (int index, const char *action)
int	GetInputArrayAssociation (int idx, vtkInformationVector **inputVector)
virtual vtkExecutive *	CreateDefaultExecutive ()
virtual void	ReportReferences (vtkGarbageCollector *)
virtual void	SetNumberOfInputConnections (int port, int n)
int	GetInputArrayAssociation (int idx, int connection, vtkInformationVector **inputVector)
int	GetInputArrayAssociation (int idx, vtkDataObject *input)
vtkDataArray *	GetInputArrayToProcess (int idx, vtkInformationVector **inputVector)
vtkDataArray *	GetInputArrayToProcess (int idx, vtkInformationVector **inputVector, int &association)
vtkDataArray *	GetInputArrayToProcess (int idx, int connection, vtkInformationVector **inputVector)
vtkDataArray *	GetInputArrayToProcess (int idx, int connection, vtkInformationVector **inputVector, int &association)
vtkDataArray *	GetInputArrayToProcess (int idx, vtkDataObject *input)
vtkDataArray *	GetInputArrayToProcess (int idx, vtkDataObject *input, int &association)
vtkAbstractArray *	GetInputAbstractArrayToProcess (int idx, vtkInformationVector **inputVector)
vtkAbstractArray *	GetInputAbstractArrayToProcess (int idx, vtkInformationVector **inputVector, int &association)
vtkAbstractArray *	GetInputAbstractArrayToProcess (int idx, int connection, vtkInformationVector **inputVector)
vtkAbstractArray *	GetInputAbstractArrayToProcess (int idx, int connection, vtkInformationVector **inputVector, int &association)
vtkAbstractArray *	GetInputAbstractArrayToProcess (int idx, vtkDataObject *input)
vtkAbstractArray *	GetInputAbstractArrayToProcess (int idx, vtkDataObject *input, int &association)
vtkInformation *	GetInputArrayFieldInformation (int idx, vtkInformationVector **inputVector)
virtual void	SetNthInputConnection (int port, int index, vtkAlgorithmOutput *input)
void	SetInputDataInternal (int port, vtkDataObject *input)
void	AddInputDataInternal (int port, vtkDataObject *input)
virtual void	SetErrorCode (unsigned long)
Protected Member Functions inherited from vtkObject
	vtkObject ()
virtual	~vtkObject ()
virtual void	RegisterInternal (vtkObjectBase *, int check)
virtual void	UnRegisterInternal (vtkObjectBase *, int check)
void	InternalGrabFocus (vtkCommand *mouseEvents, vtkCommand *keypressEvents=NULL)
void	InternalReleaseFocus ()
Protected Member Functions inherited from vtkObjectBase
	vtkObjectBase ()
virtual	~vtkObjectBase ()
virtual void	CollectRevisions (ostream &)
	vtkObjectBase (const vtkObjectBase &)
void	operator= (const vtkObjectBase &)

Protected Attributes
bool	Directed
bool	CollapseEdges
vtkSQLQuery *	EdgeQuery
vtkSQLQuery *	VertexQuery
char *	SourceField
char *	TargetField
char *	VertexIdField
char *	XField
char *	YField
char *	ZField
Protected Attributes inherited from vtkAlgorithm
vtkInformation *	Information
double	Progress
char *	ProgressText
vtkProgressObserver *	ProgressObserver
unsigned long	ErrorCode
Protected Attributes inherited from vtkObject
bool	Debug
vtkTimeStamp	MTime
vtkSubjectHelper *	SubjectHelper
Protected Attributes inherited from vtkObjectBase
vtkAtomicInt32	ReferenceCount
vtkWeakPointerBase **	WeakPointers

Additional Inherited Members
Public Attributes inherited from vtkAlgorithm
int	AbortExecute
Static Protected Member Functions inherited from vtkAlgorithm
static vtkInformationIntegerKey *	PORT_REQUIREMENTS_FILLED ()
Static Protected Attributes inherited from vtkAlgorithm
static vtkExecutive *	DefaultExecutivePrototype

Detailed Description

read a vtkGraph from a database

Creates a vtkGraph using one or two vtkSQLQuery's. The first (required) query must have one row for each arc in the graph. The query must have two columns which represent the source and target node ids.

The second (optional) query has one row for each node in the graph. The table must have a field whose values match those in the arc table. If the node table is not given, a node will be created for each unique source or target identifier in the arc table.

The source, target, and node ID fields must be of the same type, and must be either vtkStringArray or a subclass of vtkDataArray.

All columns in the queries, including the source, target, and node index fields, are copied into the arc data and node data of the resulting vtkGraph. If the node query is not given, the node data will contain a single "id" column with the same type as the source/target id arrays.

If parallel arcs are collected, not all the arc data is not copied into the output. Only the source and target id arrays will be transferred. An additional vtkIdTypeArray column called "weight" is created which contains the number of times each arc appeared in the input.

If the node query contains positional data, the user may specify the names of these fields. These arrays must be data arrays. The z-coordinate array is optional, and if not given the z-coordinates are set to zero.

Tests:

vtkSQLGraphReader (Tests)

Definition at line 66 of file vtkSQLGraphReader.h.

Member Typedef Documentation

typedef vtkGraphAlgorithm vtkSQLGraphReader::Superclass

Definition at line 70 of file vtkSQLGraphReader.h.

Constructor & Destructor Documentation

vtkSQLGraphReader::vtkSQLGraphReader ( )

protected

vtkSQLGraphReader::~vtkSQLGraphReader ( )

protected

Member Function Documentation

static vtkSQLGraphReader* vtkSQLGraphReader::New ( )

static

static int vtkSQLGraphReader::IsTypeOf ( const char *  type )

static

virtual int vtkSQLGraphReader::IsA ( const char *  name )

virtual

Return 1 if this class is the same type of (or a subclass of) the named class. Returns 0 otherwise. This method works in combination with vtkTypeMacro found in vtkSetGet.h.

Reimplemented from vtkGraphAlgorithm.

static vtkSQLGraphReader* vtkSQLGraphReader::SafeDownCast ( vtkObjectBase *  o )

static

virtual vtkObjectBase* vtkSQLGraphReader::NewInstanceInternal ( ) const

protectedvirtual

Reimplemented from vtkGraphAlgorithm.

vtkSQLGraphReader* vtkSQLGraphReader::NewInstance

(

)

const

void vtkSQLGraphReader::PrintSelf ( ostream &  os, vtkIndent  indent  )

virtual

Methods invoked by print to print information about the object including superclasses. Typically not called by the user (use Print() instead) but used in the hierarchical print process to combine the output of several classes.

Reimplemented from vtkGraphAlgorithm.

virtual void vtkSQLGraphReader::SetDirected ( bool  )

virtual

When set, creates a directed graph, as opposed to an undirected graph.

virtual bool vtkSQLGraphReader::GetDirected ( )

virtual

When set, creates a directed graph, as opposed to an undirected graph.

virtual void vtkSQLGraphReader::DirectedOn ( )

virtual

When set, creates a directed graph, as opposed to an undirected graph.

virtual void vtkSQLGraphReader::DirectedOff ( )

virtual

When set, creates a directed graph, as opposed to an undirected graph.

virtual void vtkSQLGraphReader::SetVertexQuery ( vtkSQLQuery *  q )

virtual

The query that retrieves the node information.

virtual vtkSQLQuery* vtkSQLGraphReader::GetVertexQuery ( )

virtual

The query that retrieves the node information.

virtual void vtkSQLGraphReader::SetEdgeQuery ( vtkSQLQuery *  q )

virtual

The query that retrieves the arc information.

virtual vtkSQLQuery* vtkSQLGraphReader::GetEdgeQuery ( )

virtual

The query that retrieves the arc information.

virtual void vtkSQLGraphReader::SetSourceField ( const char *  )

virtual

The name of the field in the arc query for the source node of each arc.

virtual char* vtkSQLGraphReader::GetSourceField ( )

virtual

The name of the field in the arc query for the source node of each arc.

virtual void vtkSQLGraphReader::SetTargetField ( const char *  )

virtual

The name of the field in the arc query for the target node of each arc.

virtual char* vtkSQLGraphReader::GetTargetField ( )

virtual

The name of the field in the arc query for the target node of each arc.

virtual void vtkSQLGraphReader::SetVertexIdField ( const char *  )

virtual

The name of the field in the node query for the node ID.

virtual char* vtkSQLGraphReader::GetVertexIdField ( )

virtual

The name of the field in the node query for the node ID.

virtual void vtkSQLGraphReader::SetXField ( const char *  )

virtual

The name of the field in the node query for the node's x coordinate.

virtual char* vtkSQLGraphReader::GetXField ( )

virtual

The name of the field in the node query for the node's x coordinate.

virtual void vtkSQLGraphReader::SetYField ( const char *  )

virtual

The name of the field in the node query for the node's y coordinate.

virtual char* vtkSQLGraphReader::GetYField ( )

virtual

The name of the field in the node query for the node's y coordinate.

virtual void vtkSQLGraphReader::SetZField ( const char *  )

virtual

The name of the field in the node query for the node's z coordinate.

virtual char* vtkSQLGraphReader::GetZField ( )

virtual

The name of the field in the node query for the node's z coordinate.

virtual void vtkSQLGraphReader::SetCollapseEdges ( bool  )

virtual

When set, creates a graph with no parallel arcs. Parallel arcs are combined into one arc. No cell fields are passed to the output, except the vtkGhostType array if it exists, but a new field "weight" is created that holds the number of duplicates of that arc in the input.

virtual bool vtkSQLGraphReader::GetCollapseEdges ( )

virtual

When set, creates a graph with no parallel arcs. Parallel arcs are combined into one arc. No cell fields are passed to the output, except the vtkGhostType array if it exists, but a new field "weight" is created that holds the number of duplicates of that arc in the input.

virtual void vtkSQLGraphReader::CollapseEdgesOn ( )

virtual

When set, creates a graph with no parallel arcs. Parallel arcs are combined into one arc. No cell fields are passed to the output, except the vtkGhostType array if it exists, but a new field "weight" is created that holds the number of duplicates of that arc in the input.

virtual void vtkSQLGraphReader::CollapseEdgesOff ( )

virtual

When set, creates a graph with no parallel arcs. Parallel arcs are combined into one arc. No cell fields are passed to the output, except the vtkGhostType array if it exists, but a new field "weight" is created that holds the number of duplicates of that arc in the input.

virtual int vtkSQLGraphReader::RequestData ( vtkInformation *  request, vtkInformationVector **  inputVector, vtkInformationVector *  outputVector  )

protectedvirtual

This is called by the superclass. This is the method you should override.

Reimplemented from vtkGraphAlgorithm.

virtual int vtkSQLGraphReader::RequestDataObject ( vtkInformation *  , vtkInformationVector **  , vtkInformationVector *    )

protectedvirtual

Reimplemented from vtkGraphAlgorithm.

Member Data Documentation

bool vtkSQLGraphReader::Directed

protected

Definition at line 146 of file vtkSQLGraphReader.h.

bool vtkSQLGraphReader::CollapseEdges

protected

Definition at line 147 of file vtkSQLGraphReader.h.

vtkSQLQuery* vtkSQLGraphReader::EdgeQuery

protected

Definition at line 148 of file vtkSQLGraphReader.h.

vtkSQLQuery* vtkSQLGraphReader::VertexQuery

protected

Definition at line 149 of file vtkSQLGraphReader.h.

char* vtkSQLGraphReader::SourceField

protected

Definition at line 150 of file vtkSQLGraphReader.h.

char* vtkSQLGraphReader::TargetField

protected

Definition at line 151 of file vtkSQLGraphReader.h.

char* vtkSQLGraphReader::VertexIdField

protected

Definition at line 152 of file vtkSQLGraphReader.h.

char* vtkSQLGraphReader::XField

protected

Definition at line 153 of file vtkSQLGraphReader.h.

char* vtkSQLGraphReader::YField

protected

Definition at line 154 of file vtkSQLGraphReader.h.

char* vtkSQLGraphReader::ZField

protected

Definition at line 155 of file vtkSQLGraphReader.h.

---

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

• /home/boeckb/code/depot/group-kitware/vtk/build-release/Utilities/Doxygen/dox/IO/SQL/vtkSQLGraphReader.h