connection

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

public class Database {
    private static final String URL = "jdbc://localhost/football";
    private static final String USER = "root";
    private static final String PASSWORD = "";
    private static Connection connection = null;
    private Database() { }

    public static Connection getConnection() throws SQLException {
        if (connection == null) {
            createConnection();
            connection.setAutoCommit(false);
        }
        return connection;
    }
    public static void createConnection() {
        try {
            Class.forName("com.mysql.jdbc.Driver");
            connection = DriverManager.getConnection(URL, USER, PASSWORD);
        } catch (ClassNotFoundException e) {
            System.err.print("ClassNotFoundException: " + e);
        } catch(SQLException e) {
            System.err.println("SQLException: " + e);
        }
    }

    public static void closeConnection() {
        try {
            connection.close();
        } catch (SQLException e) {
            System.err.print("D: " + e);
        }
    }

    public static void commit() {
        try {
            connection.commit();
        } catch (SQLException e) {
            System.err.print("D: " + e);
        }
    }

    public static void rollback() {
        try {
            connection.rollback();
        } catch (SQLException e) {
            System.err.print("D: " + e);
        }
    }
}