private void initConnectionRank(){
        connectionPool = new BasicDataSource();
        connectionPool.setDriverClassName("com.mysql.jdbc.Driver");
        connectionPool.setUsername("admin");
        connectionPool.setPassword("Startin9703");
        connectionPool.setUrl("jdbc:mysql://localhost:3306/Accounts?autoReconnect=true");
        connectionPool.setInitialSize(1);
        connectionPool.setMaxTotal(10);
        mysql = new MySQL(connectionPool);
        mysql.createTables();
    }

    private void initConnectionCoins(){
        connectionPool = new BasicDataSource();
        connectionPool.setDriverClassName("com.mysql.jdbc.Driver");
        connectionPool.setUsername("admin");
        connectionPool.setPassword("Startin9703");
        connectionPool.setUrl("jdbc:mysql://localhost:3306/coins?autoReconnect=true");
        connectionPool.setInitialSize(1);
        connectionPool.setMaxTotal(10);
        mysql = new MySQL(connectionPool);
        mysql.createTables();
    }
}