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Binder.h

//
// Binder.h
//
// $Id: //poco/1.4/Data/ODBC/include/Poco/Data/ODBC/Binder.h#2 $
//
// Library: Data/ODBC
// Package: ODBC
// Module:  Binder
//
// Definition of the Binder 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_Binder_INCLUDED
#define DataConnectors_ODBC_Binder_INCLUDED


#include "Poco/Data/ODBC/ODBC.h"
#include "Poco/Data/AbstractBinder.h"
#include "Poco/Data/BLOB.h"
#include "Poco/Data/ODBC/Handle.h"
#include "Poco/Data/ODBC/Parameter.h"
#include "Poco/Data/ODBC/ODBCColumn.h"
#include "Poco/Data/ODBC/Utility.h"
#include "Poco/Exception.h"
#ifdef POCO_OS_FAMILY_WINDOWS
#include <windows.h>
#endif
#include <sqlext.h>


namespace Poco {
namespace Data {
namespace ODBC {


00062 class ODBC_API Binder: public Poco::Data::AbstractBinder
      /// Binds placeholders in the sql query to the provided values. Performs data types mapping.
{
public:
      enum ParameterBinding
      {
            PB_IMMEDIATE,
            PB_AT_EXEC
      };

      Binder(const StatementHandle& rStmt,
            ParameterBinding dataBinding = PB_IMMEDIATE);
            /// Creates the Binder.

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

      void bind(std::size_t pos, const Poco::Int8& val);
            /// Binds an Int8.

      void bind(std::size_t pos, const Poco::UInt8& val);
            /// Binds an UInt8.

      void bind(std::size_t pos, const Poco::Int16& val);
            /// Binds an Int16.

      void bind(std::size_t pos, const Poco::UInt16& val);
            /// Binds an UInt16.

      void bind(std::size_t pos, const Poco::Int32& val);
            /// Binds an Int32.

      void bind(std::size_t pos, const Poco::UInt32& val);
            /// Binds an UInt32.

      void bind(std::size_t pos, const Poco::Int64& val);
            /// Binds an Int64.

      void bind(std::size_t pos, const Poco::UInt64& val);
            /// Binds an UInt64.

      void bind(std::size_t pos, const bool& val);
            /// Binds a boolean.

      void bind(std::size_t pos, const float& val);
            /// Binds a float.

      void bind(std::size_t pos, const double& val);
            /// Binds a double.

      void bind(std::size_t pos, const char& val);
            /// Binds a single character.

      void bind(std::size_t pos, const std::string& val);
            /// Binds a string.

      void bind(std::size_t pos, const Poco::Data::BLOB& val);
            /// Binds a BLOB.

      void bind(std::size_t pos);
            /// Binds a NULL value.

      void setDataBinding(ParameterBinding binding);
            /// Set data binding type.

      ParameterBinding getDataBinding() const;
            /// Return data binding type.

      std::size_t dataSize(SQLPOINTER pAddr) const;
            /// Returns bound data size for parameter at specified position.

private:
00134       typedef std::map<SQLPOINTER, SQLLEN> SizeMap;

      void bind(std::size_t pos, const char* const &pVal);
            /// Binds a const char ptr. 
            /// This is a private no-op in this implementation
            /// due to security risk.

      template <typename T>
00142       void bindImpl(std::size_t pos, T& val, SQLSMALLINT cDataType)
      {
            if (pos == 0) 
            {
                  reset();
            }
            
            _lengthIndicator.push_back(0);
            _dataSize.insert(SizeMap::value_type((SQLPOINTER) &val, sizeof(T)));

            int sqlDataType = Utility::sqlDataType(cDataType);
            
            SQLUINTEGER columnSize = 0;
            SQLSMALLINT decimalDigits = 0;

            // somewhat funky flow control, but not all
            // ODBC drivers will cooperate here
            try 
            { 
                  Parameter p(_rStmt, pos); 
                  columnSize = (SQLUINTEGER) p.columnSize();
                  decimalDigits = (SQLSMALLINT) p.decimalDigits();
            }
            catch (StatementException&)
            {     
                  try 
                  { 
                        ODBCColumn c(_rStmt, pos);
                        columnSize = (SQLUINTEGER) c.length();
                        decimalDigits = (SQLSMALLINT) c.precision();
                  }
                  catch (StatementException&) { }
            }

            if (Utility::isError(SQLBindParameter(_rStmt, 
                  (SQLUSMALLINT) pos + 1, 
                  SQL_PARAM_INPUT, 
                  cDataType, 
                  sqlDataType, 
                  columnSize,
                  decimalDigits,
                  (SQLPOINTER) &val, 
                  0, 
                  _lengthIndicator.back())))
            {
                  throw StatementException(_rStmt, "SQLBindParameter()");
            }
      }
      
      void reset();

      const StatementHandle& _rStmt;
      std::vector<SQLLEN*> _lengthIndicator;
      SizeMap _dataSize;
      ParameterBinding _paramBinding;
};


//
// inlines
//
00203 inline void Binder::bind(std::size_t pos, const Poco::Int8& val)
{
      bindImpl(pos, val, SQL_C_STINYINT);
}


00209 inline void Binder::bind(std::size_t pos, const Poco::UInt8& val)
{
      bindImpl(pos, val, SQL_C_UTINYINT);
}


00215 inline void Binder::bind(std::size_t pos, const Poco::Int16& val)
{
      bindImpl(pos, val, SQL_C_SSHORT);
}


00221 inline void Binder::bind(std::size_t pos, const Poco::UInt16& val)
{
      bindImpl(pos, val, SQL_C_USHORT);
}


00227 inline void Binder::bind(std::size_t pos, const Poco::UInt32& val)
{
      bindImpl(pos, val, SQL_C_ULONG);
}


00233 inline void Binder::bind(std::size_t pos, const Poco::Int32& val)
{
      bindImpl(pos, val, SQL_C_SLONG);
}


00239 inline void Binder::bind(std::size_t pos, const Poco::UInt64& val)
{
      bindImpl(pos, val, SQL_C_UBIGINT);
}


00245 inline void Binder::bind(std::size_t pos, const Poco::Int64& val)
{
      bindImpl(pos, val, SQL_C_SBIGINT);
}


00251 inline void Binder::bind(std::size_t pos, const float& val)
{
      bindImpl(pos, val, SQL_C_FLOAT);
}


00257 inline void Binder::bind(std::size_t pos, const double& val)
{
      bindImpl(pos, val, SQL_C_DOUBLE);
}


00263 inline void Binder::bind(std::size_t pos, const bool& val)
{
      bindImpl(pos, val, SQL_C_BIT);
}


00269 inline void Binder::bind(std::size_t pos, const char& val)
{
      bindImpl(pos, val, SQL_C_STINYINT);
}


00275 inline void Binder::setDataBinding(Binder::ParameterBinding binding)
{
      _paramBinding = binding;
}


00281 inline Binder::ParameterBinding Binder::getDataBinding() const
{
      return _paramBinding;
}


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


#endif // DataConnectors_ODBC_Binder_INCLUDED

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