private static final String URL = "jdbc:mysql://localhost:3306/blog";
private static final String LOGIN = "root";
private static final String PASSWORD = "haslo";

public static Connection connect() throws DatabaseException{
    Connection connection = null;

    try{
        connection = DriverManager.getConnection(URL, LOGIN, PASSWORD);
    }catch(Exception e){
        throw new DatabaseException("Problem by database connection", e);
    }

    return connection;
}

public static void closeConnection(Connection connection) throws DatabaseException{
    try{
        if(connection != null)
            connection.close();
    }catch(SQLException e){
        e.printStackTrace();
    }
}