Access A Database Table Multiple Times For Every Request?

Mar 16, 2011

A class in my ASP.NET website needs to access a database table multiple times for every request. The database table should rarely change, if ever. Maybe a couple times a month.

In the static constructor of the class, the table is fetched from the DB and cached in a static local variable. Whenever the class needs to access the table, then, it just uses the cached, static version.

My question concerns the lifespan of this cached, static version of the table.

I understand that it's fetched the first time the class is instantiated or a static method in the class is used. But how often does this occur on the web server? What if the table changes and we want to reset this static version of the table?

Basically, I'm wondering, is this table fetched once and then only refetched each time I restart IIS? What, with regard to the site and IIS, will trigger this static class to reset, causing the static table to be refetched?

View 3 Replies


Similar Messages:

DataSource Controls :: How To Access Database Once With Big Resultset Or Access Multiple Times On The Fly

Jun 17, 2010

I have a situation where I am accessing a database multiple times and I'm wondering if it is necessary.

I have a GridView with a template column with a hyperlink to "Get Results" and on the RowDataBound event I have it check the batch number against the database and see if results exist and then if they don't, hide the link.

So when viewing the page if there is 20 rows in the gridview it is effectively doing 20 queries.

I was wondering if it is a better idea to query the database once with all "batches" and load it into a datatable, then on the RowDataBound event query the datatable. The only issue I see with this is there is currently 40,000 batches and grows daily.

View 1 Replies

Access :: Retrieve A Single Column From A Table In A Database(ms Access)

May 26, 2010

I want to retrieve a single column from a table in a database(ms access) and then the value retrieved has to be converted to a string!!

View 4 Replies

Access :: Copying The Values From One Table To Another Table Which Are In Different Database?

Nov 1, 2010

i am using this query but it is giving syntax error,

insert
into Logistics.DisInventory
values
select *
from Logistics_v1.DisInventory)

View 4 Replies

Ajax Request Times Out (or Is Really Slow)

Nov 15, 2010

My basic structure is that I have a table on a page, which I want to reload without refreshing the entire page. So on clicking a button on the page it fires of this:

function RefreshMissionsAjax() {
//fade out the old table.
$(clientID('MissionsDisplay')).fadeOut(500);
//request the new value from the page (calls the GetIncompleteMissions() method in the MissionViewer.aspx.cs page)
$.ajax({
type: "POST",
url: "MissionViewer.aspx/GetIncompleteMissions",
data: "{}",
contentType: "application/json; charset=utf-8",
dataType: "json",
success: function (msg) {
$(clientID('MissionsDisplay')).html(msg.d);
$(clientID('MissionsDisplay')).fadeIn(500);
},
error: function (xhr, ajaxOptions, thrownError) {
$(clientID('MissionsDisplay')).html('An error occured while trying to refresh the page data.');
$(clientID('MissionsDisplay')).fadeIn(500);
}
});
}
And I have in the code bedind of an aspx page:
[WebMethod]
public static string GetIncompleteMissions()
{
return GetHTMLTable();
}

This method just grabs some data, and creates a html table - nothing too fancy. When the returned table is small (a dozen rows or less) then it works like a charm. But when it gets larger, it takes a long long time. At 100 rows it can take 5 minutes to render the table. At 1000 rows I have left it for 30 minutes and nothing will happen after the fadeout. (NB - it loads fairly quickly on the pageload, before the ajax refresh is used, so it is not the actual server side creation of the table thats the problem).

This is my first real attempt at doing something like this, so I dont know if this is the best way to do it - it was just something i pieced together that worked great when i was testing with small datasets. Now, not so much.

View 1 Replies

SelectMethod In ObjectDatasource Getting Called Multiple Times With Multiple Datapagerfield?

Oct 7, 2010

so here is the setup. I am building a page that has a listview, a datapager, and 3 datapagerfield (2 x NextPreviousPagerField, 1 x NumericPagerField), and a objectdatasource to tide all of this together.

It was all working fine until I put a breakpoint into the SelectMethod specified in the objectdatsource control. It seems like that for each datapagerfield control, it is calling the selectmethod and selectcount method. Hence, whenever a user paged, it calls the database 6 times instead of 2 (I don't have caching turned on atm). If I remove one datapagerfield, it will remove 2 calls.

Now this is build in asp.net 3.5 SP1 in VS2008. When I copied the same code files to a asp.net 4.0 VS2010 solution, it duplicate call seems to be gone.

Is this a bug in asp.net 3.5 SP1?

View 1 Replies

MVC :: 3.0 Beta: IFilterProvider.GetFilters Called 4 Times Per Request?

Oct 20, 2010

I implemented a custom IFilterProvider derived from FilterAttributeFilterProvider and

registered it using a Unity based dependency resolver. (Pretty much as described on

Brad Wilson's blog.) While debugging, I noticed that IFilterProvider.GetFilters on my

custom class get called a lot. I counted 4 times per request.

Is this normal or am I doing something wrong?

I have a simple project that reproduces the behavior if anyone is interested.

View 1 Replies

AJAX :: Request Takes A Few Minutes Then Times Out - Only In Firefox

Nov 22, 2010

I have a very peculiar problem that I've been wrapping my head around and I just can't figure it out. I have an updatepanel. Inside that I have a TabContainer. And inside that I have three TabPanels, each of which has checkboxes. Sometimes (and it happens often enough that I can easily reproduce it, but strangely may not happen with the same exact steps), when I click on different tabs or click on checkboxes inside the tabpanels (basically when I do an AJAX async postback), the request takes about a few minutes, after which the request just stops. Looking at the Firefox error console, I see this popping up after a few minutes...

Sys.WebForms.PageRequestManagerServerErrorException: An unknown error occurred while processing the request on the server. The status code returned from the server was: 0 Now, the asyncpostbacktimeout property for the ToolkitScriptManager is set at 360000, which is 6000 minutes, so the problem has nothing to do with that setting. In IE, I never have this problem and the AJAX requests are instantaneous and smooth, no delays. So this isn't a network or database lag issue. Something to do with how AJAX is run in Firefox. Why is it that sometimes, an AJAX request in Firefox takes a few minutes and just stops processing the request? And once again, the steps to reproduce this problem may not be the same every time, it seems random - very strange. Google searches have yielded very little help on this. I've tried things like extending the timeout property (which again has nothing to do with this), setting Response.Cache.SetNoStore() everywhere. Is there a crude workaround I can do (at this point, I'm willing to settle for a workaround). I just don't know anymore.

View 1 Replies

Access :: Reading Data From Access With A Linked Table (pointing To A Access Table On Another Location?

Sep 7, 2010

Here's a short explanation of my asp.net project.

1) the default page loads, it will read the Windows Login of the user opening the page.
2) I'll check if this login exists in a table stored on the webserver.

In this Access Database, there's a 2nd linked table, pointing to another access table on a network location. Now, I want to read data from this linked table. However, at this moment I receive an error:

"The Microsoft Jet database engine cannot open the file '\<ip><shared-folder>statistics.mdb'. It is already opened exclusively by another user, or you need permission to view its data".

Some extra info:

- The network folder has read and write permissions for everyone

- the user and group permissions on both access files are set to read/modify/administer for the Admin user (on the tables I want to read from)

- IIS authentication on the server is set to "Windows Authentication" (this is needed so I can read the Windows Login from the user). All other authentication modes are disables (like anonymous, ...)

- When the error occurs, no other program or process has access to the statistics.mdb (so, it can't be locked by someone else)

- the web.config files access connection string looks like:
<add name="AccessConnectionString" connectionString="Provider=Microsoft.Jet.OLEDB.4.0;Data Source=\<IP><shared-folder>statistics.mdb;User Id=admin; Password=;" />

Like I said before, in this statistics.mdb file, there are 2 tables. One normal table, and another linked table (pointing to a network location)

Searching for solutions, I discovered the following:

- if I don't use linked tables, everything works fine (however, I have to use this linked table)

- even if I connect directly to the table in the network I receive the error. So, I'm pretty sure I don't have sufficient rights to read from this table.

I read that not the Admin user is opening the file, but actually a user called ASP.NET. This user doesn't have the correct rights to do this. However, I'm not sure if this is true.

View 5 Replies

State Management :: IPartitionResolver.ResolvePartition Called Many Times Per Request?

Jan 6, 2011

I have a .NET 3.5 web application that uses SQL Server for its session state store. To improve scalability I wrote a class that implements IPartitionResolver that figures out which instance of SQL Server to use for a users session. All of this works great
and just as expected.

However, when I was debugging one day I set a breakpoint at the bottom of the ResolvePartition method to make sure the correct connection string was being returned. To my surprise this breakpoint was hit many (~5-10) times per request! The same is true about breakpoints in the IPartitionResolver.Initialize method.

Does anyone know why this is? It seems to me that you would only need to call these methods once per request. It's not like the users session is going to move to a different instance of SQL Server mid request.

View 1 Replies

AJAX :: ScriptResource.axd Is Being Invoked Several Times Per Each Aspx Page Request

Apr 1, 2010

I use ASP.NET Ajax in my web site and I am monitoring the HTTP requests per each page. I am surprised by the excessive call of ScriptResource.axd with different query string variables. I am pasting a sample of HTTP trace below. The call for ScriptResource.axd take lots time percentage out of total response time. Is this by design or there is something wrong with my AJAX configuration in web.config?

[Code]....

Actually it is degrading the performance of the application. And the user experience becoming very poor in case of lower bandwidth.

View 2 Replies

Access :: Delete Multiple Records From Database?

Feb 21, 2011

I am trying to delete multiple records from an access databse with ASP.NET VB but I'm doing something very wrong .....

Here is my code ...

[Code]....

I would also like to know once I get this working how I would delete, additional tables linked to this table by another field not ID ??

View 8 Replies

Access :: Updating Database Table With A Value From A Custom Form?

Mar 23, 2011

Im using Visual Web Developer 2010 Express and have put together a custom form using ASP controls and labels.

I now need to update an access database with the data that is captured on the form. I have added an AccessDataSource but do not know how to link the fileds to the fileds within the database so that when I click submit it updates the table.

View 8 Replies

DataSource Controls :: Delete Multiple Rows From Database In A Table?

May 1, 2010

I've have to delete multiple rows from database in a table . Which is the best way to delete data to optimize performance of sql server as well as asp.net.

View 6 Replies

Queue Access To The Database To Avoid Multiple Cache Items?

Jun 7, 2010

I have a music related ASP.NET web site which caches a lot of static information from the database on the first request.Sometimes, the application is reset and cache is cleared while the application is on heavy load and then all http requests go to the database to retrieve that static data and cache it for other requests.

How can I ensure that only one request go to the database and cache the results, so that other request simply read that info from cache and not needlessly retrieve the same info over and over again.Can I use thread locking? For example, can I do something like lock(this) { db access here }?

View 2 Replies

Web Forms :: Insert Date From Textbox Into Access Database Table?

Dec 31, 2010

[Code]....

I am sure this has been covered many times but I can not find what I am looking for and I am sure it is simple.

I am trying to insert into an access database table a date taken from a calendar control or a textbox that the calendar control writes to.

Currently I am getting a "datatype Mismatch" error.

View 6 Replies

MVC :: Connecting To MS Access Database And Generate A LINQ To SQL Class For A Table?

Mar 31, 2010

I am creating a ASP.Net application in MVC architecture. I have to connect to a database on MS Access and be able to enter data into it. All examples I see use SQL Server. When I try from prject explorer Add New Item -> Data -> I am unable to find Drivers for Access Database.

From the Data Connections in Server Explrere window I was able to make a successful connection to the database.

Does MVC 2 support MS Access Database?

View 4 Replies

AJAX :: Save Multiple Files File Path In Database Table

May 7, 2015

I want to save three images path  in table also upload images in folder,how it is possible?[Using ajax file upload control]table columns are imagepath1,imagepath2,imagepath3. URL....

HTML
<asp:AjaxFileUpload ID="AjaxFileUpload1" runat="server" AllowedFileTypes="jpg,jpeg,png,gif"
MaximumNumberOfFiles="3" OnUploadComplete="File_Upload"
Width="500px" />
 C#
protected void File_Upload(object sender, AjaxFileUploadEventArgs e)

[code]....

View 1 Replies

Web Forms :: How To Use Same Screen Multiple Times

Jun 27, 2010

In my project i need to collect customer bank details like bank Name ,Account type ,bank balance etc etc ... what would be the best way to design such that it allows us add multiple bank details to a single customer ?? and after we enter all the details all the banks details should appear in the same screen .

View 1 Replies

Using A Class Multiple Times On One Page?

Oct 28, 2010

I have a class in my App_Code folder called Order. On one of my pages I am trying to create two different orders using this class.

[Code]....

When I run the page each of the Response.Write statements ouputs a 2. But this is not correct. One should be 3 and the other should be 2. Does anyone know why this is not working?

I have a class in my App_Code folder called Order. On one of my pages I am trying to create two different orders using this class.

Private Order1 As Order
Private Order2 As Order
Sub Page_Load(ByVal Sender As Object, ByVal E As EventArgs) Handles Me.Load
Dim CartID As String = 4525543
Order1 = GetOrderFromDatabase(CartID)
Order2 = Order1
Order2.Shipping = 3
Order1.Shipping = 2
Response.Write(o.Shipping)
Response.Write(Order2.Shipping)
End Sub

When I run the page each of the Response.Write statements ouputs a 2. But this is not correct. One should be 3 and the other should be 2. Does anyone know why this is not working?

View 5 Replies

Access :: Copy Access Table Data To Sql Server Table Programmatically?

Sep 23, 2010

Dim ds As New AccessDataSource


ds.DataFile = "c:InputTest.mdb"
ds.DataSourceMode = SqlDataSourceMode.DataSet [code]....

View 5 Replies

MVC :: Initialize Method Called Multiple Times?

Jul 6, 2010

I'm overriding the Controller.Initialize method to set some stuff before each ActionResult is executed, however I'm finding that the method is being called multiple times for each request (anywhere between 2 - 10 times). I'm running in Cassini.

My hunch is that it is running for all static files (images, css etc) as well as the requested action - although I may be wrong? I thought maybe something was wrong in my web.config but it all looks right to me.

View 6 Replies

Ajax - Control Appears Multiple Times?

Oct 5, 2010

i have to two buttons in aspx page. i added ajax functionality to the page. but now thesee two button appears twice when i run the page.

View 1 Replies

Javascript - Click() Firing Multiple Times?

Aug 11, 2010

I am using a document.getElementById("val").click() to invoke a click event, but it keeps firing multiple times.

Here I add the eventHandler

try {
//add mousedown event handler to navigation buttons
addEventHandler(oPrevArrow, "mousedown", handlePrevDayClick);
addEventHandler(oNextArrow, "mousedown", handleNextDayClick);
addEventHandler(oLogout, "mousedown", handleLogoutClick);
}
catch (err) {
}

In the click event i am performing a "auto click"

function handleNextDayClick(e) {
e = e || window.event;
stopEvent(e);
document.getElementById("btn_nextday").click();
}

NB: the button that is auto-clicked calls a method in the ASP.NET Code-Behind

View 2 Replies

MVC :: Using A Partial View Multiple Times On A Page?

Feb 17, 2011

I have the JQuery tab control on my page and each tab will be using the same partial view with a filter set of the model. What is the best way to do this?

The only thing is the data needs to be filtered before it gets to each partial view.

I am currently putting the filtered model data in ViewData but I do not know how to reference that in the partial views.

[Code]....

In my partial view:

[Code]....

View 3 Replies







Copyrights 2005-15 www.BigResource.com, All rights reserved