Oracledependency事件未触发

时间:2012-08-07 08:23:00

标签: c# oracle11g

我在使用OracleDependency时遇到了一些问题。

我已经阅读了msdn和oracle上的文档,并复制了一些代码来尝试它。

但是这不起作用,插入完成时on_my_event事件不会触发。

有谁知道为什么?

我的用户对数据库具有CHANGE NOTIFICATION权限。 Oracle Server是11.2.0.3.0。

以下是代码:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using Oracle.DataAccess.Client;

namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
    string connection_string = "Data Source=My_srv;User Id=My_usr;Password=My_pwd;";
    OracleConnection connection = null;
    OracleDependency dependency = null;
    OracleCommand my_select = null;
    OracleCommand my_insert = null;

    public Form1()
    {
        InitializeComponent();
    }

    private void TB_insert_event(object sender, EventArgs e)
    {
        if (TB_insert.Text == "Name of your insert")
            TB_insert.Clear();
    }

    private void insert(object sender, EventArgs e)
    {
        connection = new OracleConnection(connection_string);
        my_insert = connection.CreateCommand();
        my_insert.CommandText = "INSERT INTO USR_DEV_TRUNK.WPARAM (wpa_codeparam) VALUES ('" + TB_insert.Text + "')";
        connection.Open();
        my_insert.ExecuteNonQuery();
        connection.Close();
    }

    private void Set_dep(object sender, EventArgs e)
    {
        OracleDependency.Port = 3048;
        connection = new OracleConnection(connection_string);
        connection.Open();
        my_select = connection.CreateCommand();
        my_select.CommandText = "SELECT wpa_codeparam FROM USR_DEV_TRUNK.WPARAM";
        dependency = new OracleDependency();
        dependency.AddCommandDependency(my_select);
        my_select.Notification.IsNotifiedOnce = false;
        my_select.ExecuteNonQuery();
        dependency.OnChange += new OnChangeEventHandler(on_my_event);
        TB_dependency.Text = "The dependency is set, do your insert to see if it works";
        connection.Close();
    }

    public void on_my_event(object obj, OracleNotificationEventArgs arg)
    {
        TB_dependency.Text = "Yay ! It worked !";
    }
  }
}

我有两个按钮:

设置我的依赖关系(功能(点击):Set_dep)

我要插入一个(功能(点击):插入)

我有两个文本框:

获取插件(名称:TB_insert)

显示依赖状态(名称:TB_dependency)

1 个答案:

答案 0 :(得分:0)

您确定端口3048上的数据包没有被防火墙阻止吗?

此外,一旦设置了依赖关系,您是否可以通过查询USER_CHANGE_NOTIFICATION_REGS / DBA_CHANGE_NOTIFICATION_REGS视图来查看它?