// DeleteQuery.h 

#ifndef dset__DeleteQuery_H
#define dset__DeleteQuery_H

// Chitra Kannan
// July 2004
//
// Class to build a Sql Delete Query. It is intended to carry the
// the constraint.

#include <string>
#include <iosfwd>

namespace dset {

class DeleteQuery {

public:  // tyepdefs

  typedef std::string Constraint;

private: //Data Members

  Constraint m_constraint;
  bool m_validity;

public:  // methods

  // Default constructor.
  explicit DeleteQuery(std::string constraint ="");

  // Destructor.
  virtual ~DeleteQuery();

  // Reset the sql query.
  DeleteQuery& reset();
 
  // Is the sql query valid
  bool is_valid() const;

  // Set a sql query.
  DeleteQuery& set(Constraint constraint);

  // Add AND constraint to sql query.
  DeleteQuery& andconstraint(Constraint constraint);

  // Add OR constraint to sql query.
  DeleteQuery& orconstraint(Constraint constraint);
  
  // Get current sql query.
  std::string get_constraint() const;

};

}  // end dataset namespace

// Output stream.
std::ostream& operator<< (std::ostream& lhs, const dset::DeleteQuery& rhs);

#endif