pgLab/pgsql/Pgsql_Value.h

#ifndef PGSQL_VALUE_H
#define PGSQL_VALUE_H

#include "Pgsql_declare.h"
#include "ArrayParser.h"
#include <sstream>
#include <QString>
#include <QDateTime>

namespace Pgsql {


	/** \brief Class that is returned as value of a cell to facilitate auto conversion.
	 */
	class Value {
	public:
		Value(const char *val, Oid typ);
		QString asQString() const;
		const char* c_str() const { return m_val; }

		operator QString() const;
		operator QDateTime() const;
		operator QDate() const;
		operator QTime() const;
		operator std::string() const;
		operator short() const;
		operator int() const;
		operator Oid() const;
		operator long long() const;
		operator bool() const;
		operator float() const;
		operator double() const;

		bool isString() const;

		/**
		 *
		 * \param insert_iter An insert_iterator which is used to add the elements of the array to a container.
		 */
		template <typename E, typename I>
		void getAsArray(I insert_iter) const
		{
			using value_type = E;
			ArrayParser parser(m_val);
			for (;;) {
				auto res = parser.GetNextElem();
				if (res.ok) {
					std::string str(res.value->data(), res.value->length());
//					std::istringstream iss(str);
					Value val(str.c_str(), ANYOID);
					value_type v;
//					iss >> v;
					v << val;
					insert_iter = v;
				}
				else
					break;
			}
		}
	private:
		const char *m_val;
		Oid m_typ;
	};

	template <typename T>
	void operator<<(T &s, const Value &v)
	{
		s = static_cast<T>(v);
	}
	
	
} // end namespace Pgsql

#endif // PGSQL_VALUE_H