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ODBCStatementImpl.h

//
// ODBCStatementImpl.h
//
// $Id: //poco/1.3/Data/ODBC/include/Poco/Data/ODBC/ODBCStatementImpl.h#3 $
//
// Library: ODBC
// Package: ODBC
// Module:  ODBCStatementImpl
//
// Definition of the ODBCStatementImpl class.
//
// Copyright (c) 2006, 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.
//


#ifndef DataConnectors_ODBC_ODBCStatementImpl_INCLUDED
#define DataConnectors_ODBC_ODBCStatementImpl_INCLUDED


#include "Poco/Data/ODBC/ODBC.h"
#include "Poco/Data/ODBC/SessionImpl.h"
#include "Poco/Data/ODBC/Binder.h"
#include "Poco/Data/ODBC/Extractor.h"
#include "Poco/Data/ODBC/Preparation.h"
#include "Poco/Data/ODBC/ODBCColumn.h"
#include "Poco/Data/StatementImpl.h"
#include "Poco/Data/Column.h"
#include "Poco/SharedPtr.h"
#include "Poco/Format.h"
#include <sstream>
#ifdef POCO_OS_FAMILY_WINDOWS
#include <windows.h>
#endif
#include <sqltypes.h>


namespace Poco {
namespace Data {
namespace ODBC {


00065 class ODBC_API ODBCStatementImpl: public Poco::Data::StatementImpl
      /// Implements statement functionality needed for ODBC
{
public:
      typedef std::vector<ODBCColumn*> ColumnPtrVec;

      ODBCStatementImpl(SessionImpl& rSession);
            /// Creates the ODBCStatementImpl.

      ~ODBCStatementImpl();
            /// Destroys the ODBCStatementImpl.

protected:
      Poco::UInt32 columnsReturned() const;
            /// Returns number of columns returned by query.

      const MetaColumn& metaColumn(Poco::UInt32 pos) const;
            /// Returns column meta data.

      bool hasNext();
            /// Returns true if a call to next() will return data.

      void next();
            /// Retrieves the next row from the resultset.
            /// Will throw, if the resultset is empty.

      bool canBind() const;
            /// Returns true if a valid statement is set and we can bind.

      void compileImpl();
            /// Compiles the statement, doesn't bind yet

      void bindImpl();
            /// Binds parameters

      AbstractExtractor& extractor();
            /// Returns the concrete extractor used by the statement.

      AbstractBinder& binder();
            /// Returns the concrete binder used by the statement.

      std::string nativeSQL();
            /// Returns the SQL string as modified by the driver.

private:
00110       typedef Poco::Data::AbstractBindingVec Bindings;
      typedef Poco::Data::AbstractExtractionVec Extractions;

      static const std::string INVALID_CURSOR_STATE;

      void clear();
            /// Closes the cursor and resets indicator variables.
      
      bool hasData() const;
            /// Returns true if statement returns data.

      bool nextRowReady() const;
            /// Returns true if there is a row fetched but not yet extracted.

      void putData();
            /// Called whenever SQLExecute returns SQL_NEED_DATA. This is expected 
            /// behavior for PB_AT_EXEC binding mode. 

      void fillColumns();
      void checkError(SQLRETURN rc, const std::string& msg="");

      SessionImpl&                 _rSession;
      const StatementHandle        _stmt;
      Poco::SharedPtr<Preparation> _pPreparation;
      Poco::SharedPtr<Binder>      _pBinder;
      Poco::SharedPtr<Extractor>   _pExtractor;
      bool                         _stepCalled;
      int                          _nextResponse;
      ColumnPtrVec                 _columnPtrs;
};


//
// inlines
//
00145 inline AbstractExtractor& ODBCStatementImpl::extractor()
{
      poco_assert_dbg (_pExtractor);
      return *_pExtractor;
}


00152 inline AbstractBinder& ODBCStatementImpl::binder()
{
      poco_assert_dbg (_pBinder);
      return *_pBinder;
}


00159 inline Poco::UInt32 ODBCStatementImpl::columnsReturned() const
{
      poco_assert_dbg (_pPreparation);
      return (Poco::UInt32) _pPreparation->columns();
}


00166 inline bool ODBCStatementImpl::hasData() const
{
      poco_assert_dbg (_pPreparation);
      return (_pPreparation->columns() > 0);
}


00173 inline bool ODBCStatementImpl::nextRowReady() const
{
      return (!Utility::isError(_nextResponse));
}


00179 inline const MetaColumn& ODBCStatementImpl::metaColumn(Poco::UInt32 pos) const
{
      std::size_t sz = _columnPtrs.size();

      if (0 == sz || pos > sz - 1)
            throw InvalidAccessException(format("Invalid column number: %u", pos));

      return *_columnPtrs[pos];
}


} } } // namespace Poco::Data::ODBC


#endif // DataConnectors_ODBC_ODBCStatementImpl_INCLUDED

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