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MySQLStatementImpl.cpp
//
// MySQLException.cpp
//
// $Id: //poco/1.4/Data/MySQL/src/MySQLStatementImpl.cpp#1 $
//
// Library: Data/MySQL
// Package: MySQL
// Module:  MySQLStatementImpl
//
// Copyright (c) 2008, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
// 
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//


#include "Poco/Data/MySQL/MySQLStatementImpl.h"


namespace Poco {
namespace Data {
namespace MySQL {


MySQLStatementImpl::MySQLStatementImpl(SessionHandle& h):
      _stmt(h),
      _extractor(_stmt, _metadata),
      _hasNext(NEXT_DONTKNOW)
{
}


00053 MySQLStatementImpl::~MySQLStatementImpl()
{
}


00058 Poco::UInt32 MySQLStatementImpl::columnsReturned() const
{
      return _metadata.columnsReturned();
}
      

00064 const MetaColumn& MySQLStatementImpl::metaColumn(Poco::UInt32 pos) const
{
      return _metadata.metaColumn(pos);
}
      

00070 bool MySQLStatementImpl::hasNext()
{
      if (_hasNext == NEXT_DONTKNOW)
      {
            if (_metadata.columnsReturned() == 0)
            {
                  return false;
            }

            if (_stmt.fetch())
            {
                  _hasNext = NEXT_TRUE;
                  return true;
            }

            _hasNext = NEXT_FALSE;
            return false;
      }
      else if (_hasNext == NEXT_TRUE)
      {
            return true;
      }

      return false;
}
      

00097 void MySQLStatementImpl::next()
{
      if (!hasNext())
            throw StatementException("No data received");   

      Poco::Data::AbstractExtractionVec::iterator it = extractions().begin();
      Poco::Data::AbstractExtractionVec::iterator itEnd = extractions().end();
      std::size_t pos = 0;

      for (; it != itEnd; ++it)
      {
            (*it)->extract(pos);
            pos += (*it)->numOfColumnsHandled();
      }

      _hasNext = NEXT_DONTKNOW;
}


00116 bool MySQLStatementImpl::canBind() const
{
      bool ret = false;

      if ((_stmt.state() >= StatementExecutor::STMT_COMPILED) && !bindings().empty())
            ret = (*bindings().begin())->canBind();

      return ret;
}


00127 void MySQLStatementImpl::compileImpl()
{
      _metadata.reset();
      _stmt.prepare(toString());
      _metadata.init(_stmt);

      if (_metadata.columnsReturned() > 0)
      {
            _stmt.bindResult(_metadata.row());
      }
}


00140 void MySQLStatementImpl::bindImpl()
{
      {
            Poco::Data::AbstractBindingVec& binds = bindings();
            size_t pos = 0;
            Poco::Data::AbstractBindingVec::iterator it = binds.begin();
            Poco::Data::AbstractBindingVec::iterator itEnd = binds.end();

            for (; it != itEnd && (*it)->canBind(); ++it)
            {
                  (*it)->bind(pos);
                  pos += (*it)->numOfColumnsHandled();
            }
      }

      _stmt.bindParams(_binder.getBindArray(), _binder.size());

      _stmt.execute();

      _hasNext = NEXT_DONTKNOW;
}


00163 AbstractExtractor& MySQLStatementImpl::extractor()
{
      return _extractor;
}


00169 AbstractBinder& MySQLStatementImpl::binder()
{
      return _binder;
}


} } } // namespace Poco::Data::MySQL

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