Column.h

/* -*- c++ -*-
 * __BEGIN_COPYRIGHT
 * SimpleDB API
 * 
 * Copyright (C) 2005 Eminence Technology Pty Ltd
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You can view the GNU Lesser General Public Licence at
 * http://www.gnu.org/licenses/lgpl.html or you can write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 * 
 * Eminence Technology Pty Ltd can be contacted by writing to
 * Eminence Technology, PO Box 118, Moorooka QLD 4105, Australia.
 * Alternatively, you may email opensource [at] eminence [dot] com [dot] au
 * __END_COPYRIGHT
 */

#ifndef __SIMPLEDB_COLUMN_H_
#define __SIMPLEDB_COLUMN_H_ 1

#include <sql.h>
#include <sqlext.h>
#include <iostream>
#include <string>
#include "Exception.h" // for Database::Exception

namespace SimpleDB {

  class Column {
    
  public:

    class UnboundException : public Exception {
    public:

      UnboundException() : Exception("Column is not bound.") {};
    };

    
    virtual bool isNull();
  
    virtual void bind(SQLHSTMT statementHandle, int columnNumber) = 0;

    virtual std::ostream& oStream(std::ostream& oStream) = 0;
  
    virtual ~Column() {};

    Column();


    void value();

  protected:
  
    SQLINTEGER lengthOrIndex;

    bool bound;

    std::string name;
  };

  class StringColumn : public Column {
  
  public:
  
    StringColumn(const int bufferSize);
  
    ~StringColumn();

    std::ostream& oStream(std::ostream& oStream);

    void bind(SQLHSTMT statementHandle, int columnNumber);

    std::string value();
    
  private:
    long bufferSize;
    char * buffer;
  };

  class LongColumn : public Column {
  
  public:
    std::ostream& oStream(std::ostream& oStream);

    void bind(SQLHSTMT statementHandle, int columnNumber);

    long value() {Column::value(); if(isNull()) return 0; else return colValue;};

  private:
    long colValue;
  
  };
  
  class BoolColumn : public Column {
  
  public:
    std::ostream& oStream(std::ostream& oStream);

    void bind(SQLHSTMT statementHandle, int columnNumber);

    bool value() ;

  private:
    unsigned char colValue;
  
  };

}

inline
std::ostream& operator<<(std::ostream& strm, SimpleDB::Column& col) {
  return col.oStream(strm);
}

#endif

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Copyright (C) 2005 Eminence Technology Pty Ltd.
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