sqldependency

问题 I have a table in a SQL Server database that represents a log file of some actions inserted from a running windows service. Everything is working well. But, I have a Windows application that gets the latest rows that have been inserted in the log table and views it in a DataGridView . While developing this application I depended on Using SqlDependency in a Windows Application from MSDN. It is working well, but when the log table receives a large number of log details, the Windows app hangs up

问题 I am trying SqlDepenedency for the first time. I am not getting any notifications on Database Update. I am placing breakpoints inside : OnChange(object sender, SqlNotificationEventArgs e) , but it never gets hit. Here is my code : protected void Page_Load(object sender, EventArgs e) { Label1.Text = "Cache Refresh: " + DateTime.Now.ToLongTimeString(); DateTime.Now.ToLongTimeString(); // Create a dependency connection to the database. SqlDependency.Start(GetConnectionString()); using

问题 I developed a web dashboard that needs to display real-time information (ASP.NET C #). Usually I use SQLServer, so the combination SignalR + SQLDependency works very well. But now I have to use a MariaDB / MySQL database and I can not find a library equivalent to SQLDependency. Is there a "trick" for notifying a change in a database? I found this library : https://www.devart.com/dotconnect/mysql/docs/Devart.Data.MySql~Devart.Data.MySql.MySqlDependency.html but it's not free ... 回答1: In MySQL,

问题 I have implemented sql dependency in windows service. when data will be changed in table then onchange event will fire and from there I am invoking a web service. I will share my full code. I tested many time on my PC before installing the windows service on production PC it works. Suppose if I install on production PC today then it works for today but when I test next day then its onchange event was not firing. so I found onchange event firing only first day and from the next day onchange

问题 I have a desktop application which should be notified on any table change. So, I found only two solutions which fits well for my case: SqlDependency and SQLCLR . ( I would like to know if there is better in .NET stack ) I have built the both structure and made them work. I only able to compare the duration of a s̲i̲n̲gl̲e̲ response from SQL Server to the client. SqlDependency Duration: from 100ms to 4 secs SQLCLR Duration: from 10ms to 150ms I would like this structure to be able to deal with

问题 I have used SQLdependency with SignalR to show alerts to users.. The code is as follows: public IEnumerable<AlertInfo> GetData(long UserId) { using (var connection = new SqlConnection(ConfigurationManager.ConnectionStrings["yafnet"].ConnectionString)) { connection.Open(); using (SqlCommand command = new SqlCommand(@"SELECT [AlertID],[AlertNote],[AlertDetails],[AlertDate],[Location] FROM [dbo].[Alerts] where [UserID]=" + UserId + " AND [IsViewed]=0", connection)) { // Make sure the command

问题 I have a console application. I wanna keep watching the changes on a specific column in my database table. I read through internet and I have found that sql dependency is good for my purpose. I started learning about it and I did the following: create a class. In the constructor, I called the static function start and I called a function that has all the sql dependency settings. My problem When I run the application using the start click on visual studio 2013, the apps works and then stops.

问题 I have written a windows service for one of our local servers. This service works like a gem on my local machine, does what it's supposed to (ACCP to exchange db data), but I'm not overly familiar with dependencies. Is this an appropriate way to structure the program? string DBP3_US = DBP3_US; string PING_DEPENDENCY = "SELECT [SomeColumn] FROM [SomeTable];"; protected override void OnStart(string[] args) { SqlDependency.Start(DBP3_US); Thread Ping_US = new Thread(PingThread); Ping_US.Name =

问题 I have just tried implementing sql dependency to detect changes in table, as far as implementation I am getting the trigger as soon as I change data in table, but problem is I am getting trigger based on number of connections. For example if I have my url open in 2 browsers then dependency on change event is triggered twice when there is a change in table, if it is opened thrice then three times my on change event is triggered and soon. Here is the code that I tried. private void GetUsers() {

问题 I have been following this post for developing a client for query notification. http://www.youdidwhatwithtsql.com/started-query-notifications-sql-server-2008-r2/1676/ I have tried this code on both visual studio and mono on my PC and these seem to fire the onDependencyChange event fine. However when I move it over to the raspberry pi with mono-complete installed it does not seem to fire. I cannot debug as the pi is in another location and I am using SSH to remote into it. static void Main