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Handle.h
//
// Handle.h
//
// $Id: //poco/1.4/Data/ODBC/include/Poco/Data/ODBC/Handle.h#1 $
//
// Library: Data/ODBC
// Package: ODBC
// Module:  Handle
//
// Definition of Handle.
//
// 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 ODBC_Handle_INCLUDED
#define ODBC_Handle_INCLUDED


#include "Poco/Data/ODBC/ODBC.h"
#include "Poco/Data/ODBC/EnvironmentHandle.h"
#include "Poco/Data/ODBC/ConnectionHandle.h"
#include "Poco/Data/ODBC/ODBCException.h"
#include "Poco/Data/ODBC/Utility.h"
#ifdef POCO_OS_FAMILY_WINDOWS
#include <windows.h>
#endif
#include <sqltypes.h>


namespace Poco {
namespace Data {
namespace ODBC {


template <typename H, SQLSMALLINT handleType>
00060 class Handle
/// ODBC handle class template
{
public:
      Handle(const ConnectionHandle& rConnection): 
            _rConnection(rConnection),
            _handle(0)
                  /// Creates the Handle.
      {
            if (Utility::isError(SQLAllocHandle(handleType, 
                  _rConnection, 
                  &_handle))) 
            {
                  throw ODBCException("Could not allocate statement handle.");
            }
      }

00077       ~Handle()
            /// Destroys the Handle.
      {
            SQLRETURN rc = SQLFreeHandle(handleType, _handle);
            poco_assert (!Utility::isError(rc));
      }

00084       operator const H& () const
            /// Const conversion operator into reference to native type.
      {
            return handle();
      }

00090       const H& handle() const
            /// Returns const reference to native type.
      {
            return _handle;
      }

private:
      Handle(const Handle&);
      const Handle& operator=(const Handle&);

00100       operator H& ()
            /// Conversion operator into reference to native type.
      {
            return handle();
      }

00106       H& handle()
            /// Returns reference to native type.
      {
            return _handle;
      }

      const ConnectionHandle& _rConnection;
      H _handle;

      friend class ODBCStatementImpl;
};


typedef Handle<SQLHSTMT, SQL_HANDLE_STMT> StatementHandle;
typedef Handle<SQLHDESC, SQL_HANDLE_DESC> DescriptorHandle;


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


#endif

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