Database Change Notification

使用java监控oracle数据库的变化，主要是针对表数据，如果发生变化，使用select去查询，能够达到推送的目的

 package com.test.notifi;

 import java.sql.ResultSet;
 import java.sql.SQLException;
 import java.sql.Statement;
 import java.util.Properties;
 import oracle.jdbc.OracleConnection;
 import oracle.jdbc.OracleDriver;
 import oracle.jdbc.OracleStatement;
 import oracle.jdbc.dcn.DatabaseChangeEvent;
 import oracle.jdbc.dcn.DatabaseChangeListener;
 import oracle.jdbc.dcn.DatabaseChangeRegistration;
 import oracle.jdbc.pool.OracleDataSource;

 public class TestNotification {

     public void run(){
         OracleDataSource dataSource;
         try {
             dataSource = new OracleDataSource();
                dataSource.setUser("hw");
                 dataSource.setPassword("112311");
                 dataSource.setURL("jdbc:oracle:thin:@198.22.1.4:1521:COPYDB1");
                  OracleConnection conn = (OracleConnection) dataSource.getConnection();

                  Properties prop = new Properties();
                  prop.setProperty(OracleConnection.DCN_NOTIFY_ROWIDS,"true");
                  prop.setProperty(OracleConnection.DCN_QUERY_CHANGE_NOTIFICATION,"true");
                  DatabaseChangeRegistration dcr = conn.registerDatabaseChangeNotification(prop);

                  DCNDemoListener list = new DCNDemoListener(this);
                  dcr.addListener(list);

                  Statement stmt = conn.createStatement();

                  ((OracleStatement)stmt).setDatabaseChangeRegistration(dcr);
 //                  ResultSet rs = stmt.executeQuery("select * from hs_secu.entrust a where a.fund_account = '610005385'");
                   ResultSet rs = stmt.executeQuery("select * from stocc");
                   while (rs.next())
                   {}
                   String[] tableNames = dcr.getTables();
                   for(int i=0;i<tableNames.length;i++)
                     System.out.println(tableNames[i]+" is part of the registration.");
                   rs.close();
                   stmt.close();
                   conn.close();
         } catch (SQLException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();

         }
     }

     public static void main(String[] a) {
             TestNotification notification = new TestNotification();
             notification.run();
 }

 }

 package com.test.notifi;

 import oracle.jdbc.dcn.DatabaseChangeEvent;
 import oracle.jdbc.dcn.DatabaseChangeListener;

 class DCNDemoListener implements DatabaseChangeListener
 {
   TestNotification demo;
   DCNDemoListener(TestNotification dem)
   {
     demo = dem;
   }
   public void onDatabaseChangeNotification(DatabaseChangeEvent e)
   {
     Thread t = Thread.currentThread();
     System.out.println("DCNDemoListener: got an event ("+this+" running on thread "+t+")");
     System.out.println(e.toString());
     synchronized( demo ){ demo.notify();}
   }
 }

使用windows机器去运行这个程序的时候，请注意，hostname需要添加自己的IP和主机名称

例如：  198.28.1.2 TIM-PC

这样oracle数据库才能知道是谁注册的