localclient.java

Java的面向对象数据库系统的源代码

import org.ozoneDB.LocalDatabase;
import org.ozoneDB.OzoneInterface;
import car.Bus;
import car.BusImpl;
import car.Auto;
import car.AutoImpl;

/**
 *
 * <br> Date: Sep 2, 2002
 * <br> Copyright Nordic Wave Inc, All rights reserved
 * @author Per Nyfelt
 */
public class LocalClient {


    public static void main(String[] args) throws Exception {
        // this would initialize a local database instead of accessing a
        // server remote
        LocalDatabase db = new LocalDatabase();
        String dbLocation = System.getProperty("user.home") + "/testdb";
        if (!db.exists(dbLocation)) {
            db.create(dbLocation);
        }
        db.open(dbLocation);

        db.reloadClasses();
        System.out.println("connected...");

        Bus bus = (Bus) db.createObject(BusImpl.class.getName());
        System.out.println("bus:" + bus);
        bus.print();
        db.deleteObject(bus);

        Auto auto = (Auto) db.objectForName("auto");
        if (auto == null) {
            auto = (Auto) db.createObject(AutoImpl.class.getName(), OzoneInterface.Public, "auto");
        }

        // doSomething() returns the database object itself. However, in the
        // client we get a proper proxy object.
        Auto auto2 = auto.doSomething(auto);

        System.out.println("auto:" + auto);
        auto.setAge(3);
        System.out.println("auto.setAge (3)");
        // auto and auto2 are proxies of the same object.
        System.out.println("auto2:" + auto2);

        Auto copy = (Auto) db.copyObject(auto);
        copy.setAge(100);
        System.out.println("\nauto:" + auto);
        System.out.println("copy:" + copy);

        db.deleteObject(copy);

        db.close();
        System.out.println("disconnected...");
    }

}