private Connection connectToDB(){
		if(this.DriverName != null && 
				this.URL != null && this.UserName != null &&
				this.PassWord != null && this.conn == null){			
			try {
				Class.forName(this.DriverName);
				this.conn = DriverManager.getConnection(this.URL,this.UserName,this.PassWord);
			} catch (SQLException e) {
				e.printStackTrace();
			} catch (ClassNotFoundException e) {
				e.printStackTrace();
			}
		}
		if(conn != null){
			System.out.println("[INFO]Connecting to DB successfully!");
		}
		return conn;
	}