mixedmode.java

非常棒的java数据库

/*
 * Copyright 2004-2008 H2 Group. Licensed under the H2 License, Version 1.0
 * (license2)
 * Initial Developer: H2 Group
 */
package org.h2.samples;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;
import org.h2.tools.Server;

/**
 * This sample program opens the same database once in embedded mode,
 * and once in the server mode. The embedded mode is faster, but only
 * the server mode supports remote connections.
 */
public class MixedMode {

    public static void main(String[] args) throws Exception {

        // start the server, allows to access the database remotly
        Server server = Server.createTcpServer(new String[] { "-tcpPort", "9081" });
        server.start();
        System.out.println("You can access the database remotely now, using the URL:");
        System.out.println("jdbc:h2:tcp://localhost:9081/~/test (user: sa, password: sa)");

        // now use the database in your application in embedded mode
        Class.forName("org.h2.Driver");
        Connection conn = DriverManager.getConnection("jdbc:h2:~/test", "sa", "sa");

        // some simple 'business usage'
        Statement stat = conn.createStatement();
        stat.execute("DROP TABLE TIMER IF EXISTS");
        stat.execute("CREATE TABLE TIMER(ID INT PRIMARY KEY, TIME VARCHAR)");
        System.out.println("Execute this a few times: SELECT TIME FROM TIMER");
        System.out.println("To stop this application (and the server), run: DROP TABLE TIMER");
        try {
            while (true) {
                // runs forever, except if you drop the table remotely
                stat.execute("MERGE INTO TIMER VALUES(1, NOW())");
                Thread.sleep(1000);
            }
        } catch (SQLException e) {
            System.out.println("Error: " + e.toString());
        }
        conn.close();

        // stop the server
        server.stop();
    }
}