~drizzle-trunk/drizzle/development

/* - mode: c; c-basic-offset: 2; indent-tabs-mode: nil; -*-

 *  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:

 *

 * Copyright (C) 2011, Brian Aker

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions are met:

 *

 *   * Redistributions of source code must retain the above copyright notice,

 *     this list of conditions and the following disclaimer.

 *   * Redistributions in binary form must reproduce the above copyright notice,

 *     this list of conditions and the following disclaimer in the documentation

 *     and/or other materials provided with the distribution.

 *   * Neither the name of Patrick Galbraith nor the names of its contributors

 *     may be used to endorse or promote products derived from this software

 *     without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE

 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF

 * THE POSSIBILITY OF SUCH DAMAGE.

 */

#pragma once

#include <drizzled/visibility.h>

#include <drizzled/sql/exception.h>

#include <drizzled/sql/result_set_meta_data.h>

#include <cassert>

#include <queue>

namespace drizzled {

namespace plugin { class Client; }

namespace sql {

class DRIZZLED_API ResultSet

{

  // First version of API stores everything as strings

  class Column {

  public:

    Column() :

      _is_null(false)

    { }

    inline const std::string &value() const

    {

      return _value;

    }

    inline bool isNull() const

    {

      return _is_null;

    }

    inline void set_value(const std::string &ref)

    {

      _value= ref;

    }

    inline void set_null()

    {

      assert(_value.empty());

      _is_null= true;

    }

  private:

    std::string _value;

    bool _is_null;

  };

  typedef std::vector< Column > Row;

  typedef std::vector< Row > Result;

public:

  static ResultSet *make(size_t field_count)

  {

    return new ResultSet(field_count);

  }

  bool next() const;

  const std::string getString(size_t column_number) const ;

  bool isNull(size_t column_number) const;

  const ResultSetMetaData &getMetaData() const;

  // Our functions to use instead of exceptions

  bool error() const;

  sql::Exception getException() const;

  ResultSet(size_t fields) :

    _has_next_been_called(false),

    _current_row(_results.end()),

    _meta_data(fields)

  {

  }

  ~ResultSet();

  void createRow();

  void setColumn(size_t column_number, const std::string &arg);

  void setColumnNull(size_t column_number);

  void pushException(const Exception &arg) const;

private: // Member methods

  bool isMore() const;

  bool isMore(size_t column_number) const;

private: // Member variables

  mutable bool _has_next_been_called;

  Result _results;

  mutable Result::const_iterator _current_row;

  ResultSetMetaData _meta_data;

  // Because an error could come up during a fetch on const, we need to have

  // this be mutable.

  mutable std::queue<Exception> _exceptions;

};

std::ostream& operator<<(std::ostream& output, const ResultSet &result_set);

} // namespace sql 

} // namespace drizzled