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RdbMySQLResult.hh

Go to the documentation of this file.

#ifndef RDBMYSQLRESULT_HH
#define RDBMYSQLRESULT_HH

//--------------------------------------------------------------------------
// File and Version Information:
//      $Id: RdbMySQLResult.hh,v 1.3 2005/04/15 17:56:07 salnikov Exp $
//
// Description:
//      Class RdbMySQLResult.
//
// Environment:
//      This software was developed for the BaBar collaboration.  If you
//      use all or part of it, please give an appropriate acknowledgement.
//
// Author List:
//      Andy Salnikov
//
// Copyright Information:
//      Copyright (C) 2005 SLAC
//
//------------------------------------------------------------------------

//-------------
// C Headers --
//-------------
extern "C" {
}

//---------------
// C++ Headers --
//---------------
#include <string>

//----------------------
// Base Class Headers --
//----------------------

//-------------------------------
// Collaborating Class Headers --
//-------------------------------
#include "RdbMySQL/RdbMySQLHeader.hh"

//------------------------------------
// Collaborating Class Declarations --
//------------------------------------
struct st_mysql_res ;
class RdbMySQLClient ;

//              ---------------------
//              -- Class Interface --
//              ---------------------


/**
 *  This class represents MySQL connection.
 *
 *  This software was developed for the BaBar collaboration.  If you
 *  use all or part of it, please give an appropriate acknowledgement.
 *
 *  Copyright (C) 2005 SLAC
 *
 *  @see RdbMySQLResultTable
 *
 *  @version $Id: RdbMySQLResult.hh,v 1.3 2005/04/15 17:56:07 salnikov Exp $ 
 *
 *  @author Andy Salnikov
 */

class RdbMySQLResult {

public:

  /**
   *  Constructor takes MYSQL_RES pointer, which must be non-zero
   */
  RdbMySQLResult( st_mysql_res* res, RdbMySQLClient* client ) ;

  /**
   *  Constructor takes the number of affected rows (for non-SELECT queries)
   */
  RdbMySQLResult( unsigned long nrows ) ;

  // Destructor
  ~RdbMySQLResult () ;

  /// get the result header. Only makes sense for SELECT-like queries
  RdbMySQLHeader header() const { return RdbMySQLHeader(_res,_client) ; }

  /// get the number of the rows in the result.
  unsigned long size() const { return _nrows ; }

protected:

  // Helper functions

private:

  // Friends
  friend class RdbMySQLRowIter ;

  // Data members
  st_mysql_res* _res ;
  unsigned long _nrows ;
  RdbMySQLClient* _client ;

  // provide access to rows and their lengths
  char** fetch_row() const ;
  unsigned long* fetch_lengths() const ;

  // Note: if your class needs a copy constructor or an assignment operator,
  //  make one of the following public and implement it.
  RdbMySQLResult( const RdbMySQLResult& );                // Copy Constructor
  RdbMySQLResult& operator= ( const RdbMySQLResult& );    // Assignment op

};

#endif // RDBMYSQLRESULT_HH

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