What are the key differences between these and when should they be used? My initial understanding was that SqlCacheDependency used polling but I've read it doesn't have too for ASP.NET 2.0. I want to know which is most appropriate for caching of linq queries under ASP.NET web server. This will be ASP.NET 3.5.
SqlCacheDependency
http://forums.asp.net/p/1010106/1353521.aspx [code]....
When I implement a SqlDependency watcher in a windows form, everything works fine as long as I invoke my "OnChance" event to the ui thread.
private void dependency_OnChange(object sender, SqlNotificationEventArgs e)
{
if (this.InvokeRequired)[code]....
The same happens when I comment these lines in the windowsform, so I think that the _OnChance Event is on a different thread than the "thread" I'm using when I call SetSqlWatcher the first time.
I also tried to implement ISynchronizeInvoke (with the help of GenericSynchronizingObject in libary http://nitoasync.codeplex.com). I debugged, saw, that the code has to invoke it the first time, but it also hangs in "SqlDependency.Stop"...
I'm using SqlDependency to control my cache. I want to use it to monitor several tables (around 10). There should be one SqlDependency per watched table.
Should I create for each of them code like that:
public void CreateDependency_Table()
{
if (connectionStringSettings != null) [code]....
or can I reuse something between them? Like connection?Is this the preferred way of setting multiple notifications?
explain me how to implement SQL Dependency Caching in Asp.Net?
View 3 RepliesI put a sqldependency in my application but the onchanged event does not fire, I tried to put some breakpoints and it thru to the label1.text = "Changed".
View 2 RepliesI'm trying to use SqlCacheDependency with List<T>, but searching google etc only comes back with datasets, datatables etc.
So how do i use SqlCacheDependency with the following code:
public List<GetCurrencyCodeOBJ> GetListCurrencyCode()
{
SqlConnection cn = new SqlConnection(dbConn);[code]....
I find the SqlCacheDependency very useful when writing C# ASP.NET applications, and would love to use something similar in my PHP applications. Can anyone suggest something?
SqlCacheDependency caches the page page output forever, until the specified table(s) are modified in the database.
Here's the basic jist of what happens in ASP.NET:
SqlCacheDependency SqlDep = null;
// Check the Cache for the SqlSource key.
// If it isn't there, create it with a dependency [code]...
So does anyone know of any MySql table dependency technique? - much cleaner than time-based caching.
I'm really struggling to get this to work, how can i set up SqlCacheDependency on a List<>
My code is as follows:
[Code]....
All examples i find either relate to datasets etc or adding tables to sql
I'm currently using SQL2008 Express and NET 4.0
I am using sqlCacheDependency, and usually upon any changes in the database cache items get deleted automatically. In my case everything works allright, but I had to buy a new laptop and I moved the same exact database and the same exact webapplication to the new laptop. Unfortunately, on my new machine the cache items remain in cache upon data updates on the database.
I have enabled servicebroker on the database, and started it in the application_start event in my webapplication. I also ran the following:
GRANT SUBSCRIBE QUERY NOTIFICATIONS
TO "Naji-pcNaji"
The differance I see on my laptop from my other machine is that the database is named (local). Naji-pc is the name of my machine.
My Asp.Net app caches some lookup DataTables to avoid hitting DB for seldomly changed data. When the data does change, however, I would like to use the sqlCacheDependency to get SQL Server to send a notification to my application, which should then reload the table into the cache.
In my application, the callback is not being executed, and the cache is not updated when data is changed in SQL Server.
I am using SQL 2005. This is my code:
***************************
[Code]....
I have a big problem in using SqlCacheDependency and Sqlserver notification service.I just want to add a dataset to cache with a SqlCacheDependency and get expire notification from sql server , Here is the simple code that doesn't work
(.net 4 , sqlserver 2008)
private DataSet GetData()
{[code]....
I have enabled my database service broker with : [alter database dbName set ENABLE_BROKER] I have created a master key for my databese with : [CREATE MASTER KEY ENCRYPTION BY PASSWORD = '1']
There is no error in sql server log file but when I change my skin table data , my cached dataset still remains in cache , it seems that there is no notification from sql server about changing the result of my Sqlcmd (that the SqlCacheDependency is created on it)
I would like to display real time updates on a web page (based on a status field in a database table that is altered by an external process). Based on my research, there are several ways of doing this.
Long Polling (Comet) - This seems to be complex to implement Regular Polling - I can have an AJAX method trigger a database hit every 5seconds to get the current status. But I fear this will have performance issues.
Then I read about using SqlCacheDependency - basically the cache gets invalidated based on a field in the table. I am assuming I can use the event trigerred when the cache is invalidated to show the new update to the user?
Iam adding SqlCacheDependency programmatically but Iam not able to invalidate the cache.
Iam using the following Output cache directive in the .aspx page
[Code]....
The code in the .aspx.cs file is:
[Code]....
I am trying to use SqlCacheDependency in my web site.I got in touch with my hosting compnay and they said that they support cache but they set the trust level to medium and what I try to do needs full trust level whihch they cannot provide for me.
can someone show me a way or a code samples that use SqlCacheDependency with medium level trust?
the broker is enabled in the hosting sql server
this code raise the error that the hosting providers said that they cannot support in medium level:
System.Data.SqlClient.SqlDependency.Start(ConfigurationManager.ConnectionStrings("myConnectionString").ConnectionString)
I have the tables needed in my developer SQL server , but I don't know how or if I can set it in the hosting SQL server db
and this is my code to get the data from cache or from DB that works on my developer station:
If Cache("allitems") Is Nothing Then
In my database I have altered stored procedure AspNet_SqlCacheRegisterTableStoredProcedure that is used for SqlCacheDependency to register tables that are in different schema then dbo (original procedure allows only tables for dbo schema).
That works, but I can't register same table name for different schemas, for example dbo.MyTable and MySchema.MyTable.In column tableName in table AspNet_SqlCacheTablesForChangeNotification there are only table names without schemas.
Is it possible to register same table names and different schemas?
In our project we have planned to put cache dependency on the queries, such that whenever the query result changes the cache gets invalidated. The problem is most of our queries use Distinct, top and group by. As I have learnt that SqlCacheDependency does not support queries with Distinct and Top, So, how should we proceed to implement the query dependency when the queries are complex.
View 2 Replies how can i use the SqlCacheDependency with StoredProcedure.
I wrote like this, but it is not working.
SqlConnection conn = new SqlConnection("Data Source=SHIVAKUMAR\SQLEXPRESS;Initial Catalog=PracticeDb;Integrated Security=True");
I have an ASP.NET 3.5 web page that tries to retrieve a DataSet from a cache object. If not available, it will be retrieved from the database (SQL Server 2005) and I will insert the newly retrieved DataSet into the Cache object. The problem is that I want to insert the DataSet with a SqlCacheDependency so that as soon as the database table changes, my ASP.NET application will be notified. Something that is accomplished in @PageOutput using SqlDependency="CommandNotification". SqlCacheDependency constructor has two overloads, neither of which seems to be able to resolve my problem. I have no idea where I can set that magical CommandNotification!
View 6 RepliesI have been trying to get SqlCacheDependency working. I think I have everything set up correctly, but when I update the table, the item in the Cache isn't invalidated.
I enabled the Service Broker for the Sandbox database.I have placed the following code in the Global.asax file. I also restart IIS to make sure it is called.
void Application_Start(object sender, EventArgs e) {
SqlDependency.Start(ConfigurationManager.ConnectionStrings["SandboxConnectionString"].ConnectionString);
}
I have placed this entry in the web.config file:
<system.web>
<caching>
<sqlCacheDependency enabled="true" pollTime="10000">[code]....
I call this code to put the item into the cache:
protected void CacheDataSetButton_Click(object sender, EventArgs e) {
using (SqlConnection sqlConnection = new SqlConnection(ConfigurationManager.ConnectionStrings["SandboxConnectionString"].ConnectionString))[code].....
Then I bind the GridView with this code:
protected void BindGridViewButton_Click(object sender, EventArgs e) {
if (Cache["Pets"] != null) {
GridView1.DataSource = Cache["Pets"] as DataSet;
GridView1.DataBind();
}
}
Between attempts to DataBind the GridView, I change the table's values expecting it to invalidate the Cache["Pets"] item, but it seems to stay in the Cache indefinitely.
I have setup and SqlCacheDependency for my site and all is working well, but there is one requirement in my task that I dont' seem to be able to find the workaround for. Currently, my code relies on the following web.config settings to allow the SqlCacheDependency to know where to connect to. it is like this:
<connectionStrings>
<add name="connstring1" connectionString="......" />
</connectionStrings>
<caching>
<sqlCacheDependency enabled="true" pollTime="500">
<databases>
<add name="db1" connectionStringName="connstring1" pollTime="500" />
</databases>
</sqlCacheDependency>
</caching>
The problem is that we can't allow in our application the connectionstring to be on the web.config. I am asked to programmatically do all of that. I don't know how and I don't know if that is even possible, is it?
I have followed this tutorial for signal r [URL]....
Instead of using MVC or Web api I have used Web Forms and Called the method as
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Services;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class Default2 : System.Web.UI.Page {
[CODE]..
http://msdn.microsoft.com/en-us/library/system.web.caching.sqlcachedependency(v=VS.90).aspx
I could not locate the class SqlCacheDependency as per this MS article!
I think it is a problem that SqlCacheDependency may invalidate a cache item while it is being set:
function getCacheItem()
if cacheitem is empty
cacheitem = something
AND AT THIS POINT SqlCacheDependency INVALIDATES THE cacheitem
end if
return cacheitem
end function
how can we prevent this? Is it somehow possible to specify a ReaderWriterLockSlim for the SqlCacheDependecy to use?
I am binding repeater control for mega menu, its working fine but i want to repeater do not load every time from database ,it load when any change or add in database ....
View 1 Replies