~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.

 */

#include "config.h"

#include <drizzled/sql/exception.h>

#include <drizzled/sql/result_set.h>

#include <iostream>

namespace drizzled {

namespace sql {

static Exception exception_unknown_column("Unknown Column", "S0022", ER_BAD_FIELD_ERROR);

static Exception exception_no_more_results("No additional rows founds", "S0022", ER_BAD_FIELD_ERROR);

ResultSet::~ResultSet()

{

}

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

{

  if (not isMore(column_number))

    return "";

  return (*_current_row)[column_number].value();

}

bool ResultSet::isNull(size_t column_number) const

{

  return (*_current_row)[column_number].isNull();

}

void ResultSet::pushException(const Exception &arg) const

{

  if (_exceptions.empty())

  {

    _exceptions.push(arg);

    return;

  }

  _exceptions.front().setNextException(arg);

}

bool ResultSet::isMore() const

{

  if (_current_row == _results.end())

  {

    pushException(exception_no_more_results);

    return false;

  }

  return true;

}

bool ResultSet::isMore(size_t column_number) const

{

  if (column_number >= _meta_data.getColumnCount())

  {

    pushException(exception_unknown_column);

    return false;

  }

  return isMore();

}

bool ResultSet::error() const

{

  return not _exceptions.empty();

}

sql::Exception ResultSet::getException() const

{

  return _exceptions.empty() ? sql::Exception() : _exceptions.front();

}

const ResultSetMetaData &ResultSet::getMetaData() const

{

  return _meta_data;

}

void ResultSet::createRow()

{

  assert(_meta_data.getColumnCount());

  _results.resize(_results.size() +1);

  _results.back().resize(_meta_data.getColumnCount());

}

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

{

  assert(column_number < _meta_data.getColumnCount());

  assert(_results.back().at(column_number).isNull() == false); // ie the default value

  assert(_results.back().at(column_number).value().empty() == true); // ie no value has been set yet

  _results.back().at(column_number).set_value(arg);

}

void ResultSet::setColumnNull(size_t column_number)

{

  assert(column_number < _meta_data.getColumnCount());

  assert(_results.back().at(column_number).isNull() == false); // ie the default value

  assert(_results.back().at(column_number).value().empty() == true); // ie no value has been set yet

  _results.back().at(column_number).set_null();

}

bool ResultSet::next() const

{

  if (not _has_next_been_called)

  {

    _current_row= _results.begin();

    _has_next_been_called= true;

  }

  else

  {

    _current_row++;

  }

  if (_current_row == _results.end())

    return false;

  return true;

}

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

{

  while (result_set.next())

  {

    for (size_t x= 0; x < result_set.getMetaData().getColumnCount(); x++)

    {

      if (result_set.isNull(x))

      {

        output << "<null>" << '\t';

      }

      else 

      {

        output << result_set.getString(x) << '\t';

      }

    }

    output << std::endl;

  }

  return output;

}

} // namespace sql 

} // namespace drizzled