Sqldatasource Weirdness On Postback

Jan 7, 2006

If I alter the SqlDataSource select command in code and then bind to a gridview, I run into problems. When I do a sort, next page (basically any postback), the datasource goes back to the original state. It is like the SqlDataSource is not maintained in the  state. I end up having to re-alter the SqlDataSource select command on every page_load. Is this by design or is this a bug?

Is the SqlDataSource any "smarter" than doing it the old fashion way by populating a Dataset on (!IsPostBack) ? For example, if I have a bunch of data in a paged gridview, is the SqlDataSource smart enough not to bother filling the entire dataset if I don't need it for that page's display?  I know the SqlDataSource provides for update/insert/delete, but I am not doing that in this application, it is just a query/report page.

Thanks in advance

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Sqldatasource Setting Reset After Page Postback, Could Anyone Give Me A Hand On This

Nov 25, 2005

Hi, I have created a search page which needs to perform different
search function in same page. I have setuped a sqldatasource then
manual
setup the connection string and command inside the codefile. So the
select command can be various depends on the event. The problem is
all of those setting will be reset after I click on the pageindex in
the girdview control to go to next pages. Since this gridview is linked

with this sqldatasource control, I need to restore the connection
string/command when user choose decide to view next page of data inisde
the
gridview.

I think I must have done something wrong in here becuase it will end up
retrieving  the total amount of data when everytime user choose to
view next
or perivous page.

Can someone give me a hand on this ? Thanks

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Mar 30, 2001

Hey folks,
Today's been way too much fun...
Someone changed the name of a machine in our department and now Win2k thinks the machine's name is (for example) "Fred", but if I do a select @@servername, SQL returns (again, for example) "Barney".

The machine's name started out as "Barney".

The last time this happened, it was on an NT4 box, and we just reinstalled sql and away we went.

This time, they reinstalled sql and released the box to the team, only to find out later that reinstalling sql didn't do squat this time.

Which brings me to the question: How do I convince SQL that it's really, truly supposed to be named "Fred"?
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Any assistance would be greatly appreciated.

: )

Thanks,

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Nov 23, 2005

I am trying to import data from Access 2000 in SQL Server 2000 usingDTS. One of the tasks requires a multi-table join but I am gettingsyntax errors if I generate the query with Build Query.With just a single join like this it works fine:FROM Tracker INNER JOINbdmanager ON Tracker.bdmanager = bdmanager.name,countryBut as soon as I get it to generate an extra join, e.g.FROM Tracker INNER JOINbdmanager ON Tracker.bdmanager = bdmanager.nameINNER JOINcountry ON Tracker.country = country.country.... I get "sytax error (missing operator)". The weird thing is that itgenerated the syntax itself!I can paste the query into Access and it works fine.Why is this happening and what's the best workaround?ThanksAndy

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Apr 15, 2008

I've been writing stored procedures for a while, but right now I'm stumped on something. I've got this one error when I try to use OPENROWSET in my stored procedure that tells me I need to set my ANSI_NULLS and ANSI_WARNINGS, so I put SET ANSI_NULLS ON GO SET ANSI_WARNINGS ON GO into my stored procedure, I clicked check syntax (this is all in enterprise manager), it was okay, I clicked okay, it told me I needed to set those things again, so I played around some more, deleted the SET ANSI's, adding them, deleting them, moving them around, and eventually it worked after I deleted them again.

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Mar 4, 2008

Hi,

I have an Excel source > Data Conversion task > OLE DB Destination.

In the Data Conversion task I rename all the outputs to match the column names in my destination table.

However, when I go to map the columns in the OLE DB Destination mapping tab, it's a mess. Some fields are prefaced by "Data Conversion" as in "Data Conversion.column1", others are prefaced by "Excel Source" and others have no prefix at all.

What's confusing is, since all the columns are going through the Data Conversion task, how come I don't have ALL fields prefaced by "Data Conversion" ?

That is, only SOME of the fields have a "Data Conversion" prefix, and some don't. The ones that aren't prefaced by "Data Conversion" have no corresponding "Excel Source" so I'm assuming that the ones without the prefix are from the Data Conversion task.

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Jul 20, 2005

There is something very strange going on here. Tested with ADO 2.7 andMSDE/2000. At first, things look quite sensible.You have a simple SQL query, let's sayselect * from mytab where col1 = 1234Now, let's write a simple VB program to do this query back to anMSDE/2000 database on our local machine. Effectively, we'llrs.open sSQLrs.closeand do that 1,000 times. We wont bother fetching the result set, itisn't important in this example.No problem. On my machine this takes around 1.6 seconds and modifyingthe code so that the column value in the where clause changes eachtime (i.e col1 = nnnn), doesn't make a substantial difference to thistime. Well, that all seems reasonable, so moving right along...Now we do it with a stored procedurecreate procedure proctest(@id int)asselect * from mytab where col1 = @idand we now find that executingproctest nnnn1,000 times takes around 1.6 seconds whether or not the argumentchanges. So far so good. No obvious saving, but then we wouldn'texpect any. The query is very simple, after all.Well, get to the point!Now create a table-returning UDFcreate function functest(@id int) returns table asreturn(select * from mytab where col1 = @id)try calling that 1,000 times asselect * from functest(nnnn)and we get around 5.5 seconds on my machine if the argument changes,otherwise 1.6 seconds if it remains the same for each call.Hmm, looks like the query plan is discarded if the argument changes.Well, that's fair enough I guess. UDFs might well be more expensive...gotta be careful about using them. It's odd that discarding the queryplan seems to be SO expensive, but hey, waddya expect?. (perhaps theUDF is completely rebuilt, who knows)last test, then. Create an SP that calls the UDFcreate procedure proctest1(@id int)asselect * from functest(@id)Ok, here's the $64,000 question. How long will this take if @idchanges each time. The raw UDF took 5.5 seconds, remember, so thisshould be slightly slower.But... IT IS NOT.. It takes 1.6 seconds whether or not @id changes.Somehow, the UDF becomes FOUR TIMES more efficient when wrapped in anSP.My theory, which I stress is not entirely scientific, goes somethinglike this:-I deduce that SQL Server decides to reuse the query plan in thiscircumstance but does NOT when the UDF is called directly. This iscounter-intuitive but it may be because SQL Server's query parser istuned for conventional SQL i.e it can saywell, I've gotselect * from mytab WHERE [something or other]and now I've gotselect * from mytab WHERE [something else]so I can probably re-use the query plan from last time. (I don't knowif it is this clever, but it does seem to know when twotextually-different queries have some degree of commonality)Whereas withselect * from UDF(arg1)andselect * from UDF(arg2)it goes... hmm, mebbe not.... I better not risk it.But withsp_something arg1andsp_something arg2it goes... yup, i'll just go call it... and because the SP was alreadycompiled, the internal call to the UDF already has a query plan.Anyway, that's the theory. For more complex UDFs, by the way, theperformance increase can be a lot more substantial. On a big complexUDF with a bunch of joins, I measured a tenfold increase inperformance just by wrapping it in an SP, as above.Obviously, wrapping a UDF in an SP isn't generally a good thing; theidea of UDFs is to allow the column list and where clause to filterthe rowset of the UDF, but if you are repeatedly calling the UDF withthe same where clause and column list, this will make it a *lot*faster.

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May 3, 2008



I want that a textbox do a postback after I change the text : I change autompostback to true , It's do a postback after
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Mar 20, 2008

Hi.
We have a problem. The sql insert don't work together with postback on the insert button. The following solution has been sugested:Partial Class Login
Inherits System.Web.UI.Page

Protected WithEvents loginButton As Button

Protected Sub loginButton_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles loginButton.Click
Response.Redirect("Tunnel1.aspx")
End Sub

End Class
 But it doesn't work (the data is saved in the databse but the page isn't redirected to "Tunnel1.aspx"), why?
Here is the code for the page:<%@ Page Language="VB" MasterPageFile="~/MasterPage.master" AutoEventWireup="false" CodeFile="Login.aspx.vb" Inherits="Login" title="Untitled Page" %>

<asp:Content ID="Main" ContentPlaceHolderID="Main" Runat="Server">
<asp:SqlDataSource ID="SqlDataSource1" runat="server"
ConnectionString="<%$ ConnectionStrings:DatabaseConnectionString %>"

InsertCommand="INSERT INTO konsult(användarnamn, lösenord) VALUES (@användarnamn, @lösenord)">
</asp:SqlDataSource>

<asp:FormView ID="FormView1" runat="server" DataSourceID="SqlDataSource1" DefaultMode="Insert">
<InsertItemTemplate>

<table cellpadding="0" cellspacing="0" width="100%" border="0">
<!-- Menyrad -->
<tr>
<td colspan="2">
<table align="right" cellpadding="0" width="100%" bgcolor="#EEEEEE">
<tr>
<td align="left">
<script type="text/javascript" language="JavaScript">showMenus(1,'Horizontal')</script>
</td>
<td width="100%" align="right">
</td>
</tr>
</table>
</td>
</tr>
<!-- Sidan -->
<tr>
<!-- Topp skuggor -->
<td width="500" height="15" style="background-image: url('Images/toppskugga_Liten.jpg'); background-repeat: no-repeat; background-position: center bottom">
<table cellpadding="0" cellspacing="0">
<tr>
<td width="20"></td>
<td width="460"></td>
<td width="20"></td>
</tr>
</table>
</td>
</tr>
<tr>
<!-- Mellan skuggor -->
<td width="500" style="background-image: url('Images/mellanskugga_Liten.jpg'); background-repeat: repeat-y; background-position: center bottom">
<table cellpadding="0" cellspacing="0">
<tr>
<td width="20"></td>
<td width="460">
<table width="100%">
<tr>
<td width="150">Användarnamn:*</td>
<td width="250"><asp:TextBox Width="150" ID="användarnamnTextBox" runat="server" Font-Size="X-Small" Text='<%# Bind("användarnamn") %>' /></td>
</tr>
<tr>
<td width="150">Lösenord:*</td>
<td width="250"><asp:TextBox Width="150" textMode="Password" ID="lösenordTextBox" runat="server" Font-Size="X-Small" Text='<%# Bind("lösenord") %>' /></td>
</tr>
<tr>
<td width="150">Upprepa lösenord:*</td>
<td width="250"><asp:TextBox Width="150" textMode="Password" ID="upprepalösenTextBox" runat="server" Font-Size="X-Small" Text="" /></td>
</tr>
</table>
</td>
<td width="20"></td>
</tr>
</table>
</td>
<td rowspan="3" width="240" valign="top">
<table cellpadding="0" cellspacing="0">
<tr>
<td width="240" align="right">
 
<asp:Button ID="loginButton" CommandName="Insert" CausesValidation="True" runat="server" Text="Spara" />
 
</td>
</tr>
<tr>
<td width="240" style="background-image: url('Images/toppskugga_Mini.jpg'); background-repeat: repeat-y; background-position: center bottom"> </td>
</tr>
<tr>
<td width="240" style="background-image: url('Images/mellanskugga_Mini.jpg'); background-repeat: repeat-y; background-position: center bottom">
<table>
<tr>
<td width="20"></td>
<td width="200" valign="top">
<asp:CheckBox ID="CheckBox1" runat="server" Text="Jag godkänner att mina personuppgifter registreras enligt PUL." />
</td>
<td width="20"></td>
</tr>
</table>
</td>
</tr>
<tr>
<td width="240" style="background-image: url('Images/bottenskugga_Mini.jpg'); background-repeat: repeat-y; background-position: center bottom"> </td>
</tr>
</table>
</td>
</tr>
<tr>
<!-- Botten skuggor -->
<td width="500" height="20" style="background-image: url('Images/bottenskugga_Liten.jpg'); background-repeat: no-repeat; background-position: center bottom">
<table cellpadding="0" cellspacing="0">
<tr>
<td width="20"></td>
<td width="460"></td>
<td width="20"></td>
</tr>
</table>
</td>
</tr>
</table>

</InsertItemTemplate>
</asp:FormView>
</asp:Content>

 

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Mar 21, 2007

Hi,

I'm working on a report having 2 date parameters(which uses calendar control) and a dropdownlist. But on selecting each of these parameters, the page refreshes. For eg On selecting a date from the calendar control results in a postback. The same is the case with the dropdownlist. Could you please help to resolve this issue? We need the postback to happen only on clicking the 'View Report' button.

Also, is there any way to customize the 'View Report' button. It always appears in the right hand side. Can we set the position of this button so that it appears just below the paging button?

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Dec 7, 2006

Hey,
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Hi Everyone-

i have a report that include a parameter of type date and it is visible to the user in order to choose the date and submit view report button to rendering the report.



i don€™t know if it is a bug in SSRS or not

but the problem is that if the user try to click on the date button of the parameter and choose a date

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Note:


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Hi,

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Sub Page_load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
If Not Page.IsPostBack Then
Dim objReader As New Dynamic.Reportsdemo
SqlDataSource1 = .objReader.Get_Tickets(1, 0, "all")
 
SqlDataSource1.DataBind()
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End If
End Sub
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