library: libTree #include "TTreeResult.h"

# TTreeResult

class description - source file - inheritance tree (.pdf)

## class TTreeResult : public TSQLResult

| Inheritance Chart:

`TObject`

<-

`TSQLResult`

<-

`TTreeResult`

        private:

            void AddField(Int_t field, const char* fieldname)
            void AddRow(TSQLRow* row)
          Bool_t IsValid(Int_t field)

        public:

                              TTreeResult()
                              TTreeResult(Int_t nfields)
                              TTreeResult(const TTreeResult&)
                      virtual ~TTreeResult()
               static TClass* Class()
                 virtual void Close(Option_t* option = "")
                virtual Int_t GetFieldCount()
          virtual const char* GetFieldName(Int_t field) const
                   TObjArray* GetRows() const
              virtual TClass* IsA() const
             virtual TSQLRow* Next()
                 TTreeResult& operator=(const TTreeResult&)
                 virtual void ShowMembers(TMemberInspector& insp, char* parent)
                 virtual void Streamer(TBuffer& b)
                         void StreamerNVirtual(TBuffer& b)

### Data Members

        private:

               Int_t fColumnCount  number of columns in result
            TString* fFields       [fColumnCount] array containing field strings
          TObjArray* fResult       query result (TTreeRow objects)
               Int_t fNextRow      row iterator

## Class Description

     TTreeResult

     Class defining interface to a TTree query result with the same
     interface as for SQL databases. A TTreeResult is returned by
     TTree::Query() (actually TTreePlayer::Query()).

     Related classes are TTreeRow.

TTreeResult()

     Create a query result object.

TTreeResult(Int_t nfields)

     Create a query result object.

~TTreeResult()

     Cleanup result object.

void Close(Option_t *)

     Close query result.

Bool_t IsValid(Int_t field)

     Check if result set is open and field index within range.

Int_t GetFieldCount()

     Get number of fields in result.

const char* GetFieldName(Int_t field)

     Get name of specified field.

TSQLRow* Next()

     Get next query result row. The returned object must be
     deleted by the user and becomes invalid when the result set is
     closed or deleted.

void AddField(Int_t field, const char *fieldname)

     Add field name to result set. This is an internal method that is not
     exported via the abstract interface and that should not be user called.

void AddRow(TSQLRow *row)

     Adopt a row to result set. This is an internal method that is not
     exported via the abstract interface and that should not be user called.

### Inline Functions

              TObjArray* GetRows() const
                 TClass* Class()
                 TClass* IsA() const
                    void ShowMembers(TMemberInspector& insp, char* parent)
                    void Streamer(TBuffer& b)
                    void StreamerNVirtual(TBuffer& b)
             TTreeResult TTreeResult(const TTreeResult&)
            TTreeResult& operator=(const TTreeResult&)

Author: Fons Rademakers 30/11/99
Last update: root/tree:$Name: $:$Id: TTreeResult.cxx,v 1.3 2001/12/08 15:18:36 brun Exp $
Copyright (C) 1995-2000, Rene Brun and Fons Rademakers. *