garageapp.java

Java的面向对象数据库系统的源代码

import java.util.*;
import org.ozoneDB.*;

public class GarageApp {
    
    public static void main( String[] args ) throws Exception {
        
        if (args.length == 0) {
            System.out.println( "usage: ojvm GarageApp create|delete|oldtimers" );
            System.exit( 1 );
        }
        
        ExternalDatabase db = ExternalDatabase.openDatabase( "ozonedb:remote://localhost:3333" );
        System.out.println( "Connected ..." );
        
        db.reloadClasses();
        
        if (args[0].equals( "create" )) {
            db.createObject( GarageImpl.class.getName(), 0, "my_garage" );
        
        } else if (args[0].equals( "delete" )) {
            Garage garage = (Garage)(db.objectForName( "my_garage" ));
            if (garage != null) {
                db.deleteObject( garage );
            }

        } else if (args[0].equals( "add" )) {
            Garage garage = (Garage)(db.objectForName( "my_garage" ));
            if (garage != null) {
                garage.addCar_update( args[1], Integer.parseInt( args[2] ) );
            } else {
                System.out.println( "Garage object not found!" );
            }

        } else if (args[0].equals( "oldtimer" )) {
            Garage garage = (Garage)(db.objectForName( "my_garage" ));
            if (garage != null) {
                System.out.println( "Oldtimers:" );
                Vector oldtimers = garage.oldtimers();
                for ( int i = 0; i < oldtimers.size();  i++ ) {
                    Car car = (Car)(oldtimers.elementAt( i ));
                    System.out.println( "    Car " + car.name() + " age=" 
                            + car.age() );
                }
            } else {
                System.out.println( "Garage object not found!" );
            }
        } else {
            System.out.println( "Unknown parameter: " + args[0] );
        }
        
        db.close();
    }
}