#include <fstream>
#include <iostream>
#include <vector>

class db_engine {
	std::vector<std::string> cmdList;

public:
	db_engine();
	void createCmd();
	//void openCmd();
	void saveCmd();
	void showCmd();
	void insertQuery();
	void deleteQuery();
	void selectQuery();
	void projectQuery();
	void productQuery();
	bool unionComp();
};