Bind Grid To SQLce Data That Is Being Updated From Another Thread
Dec 17, 2007
Hi
We are building a near real time application in Windows Forms, that stores data in SQL Compact Edition.
The client receives messages via UDP socket and performs insert / update operations to the db accordingly, and the requirement is to update a data grid with the changes.
We tried querying the db and receive a ResultsSet which is sensitive and scrollable, and bind a ResultSetView to the Grid. But, since the updates are made from another thread, the grid is not being refreshed.
What is the best approach for achieving this?
Thanks in advance,
Guy Burstein
http://blogs.microsoft.co.il/blogs/bursteg
I am sending a GUID to a form via the query string. If it exists I use helper functions to load most of the form text boxes. However, if it does not then a blank form is presented and the GUID is stored in a hidden field. Regardless, I use this hidden field to populate a grid that is attached to a sqldatasource. If I then add new datarows to the backend database programmatically, I cannot 'requery' the datasource to include those row upon a postback. I cannot seem to find a simple way to force the sqldatasource to rerun the query. Can anyone help.
Hi ! I have a textbox and a Search button. When the user inputs a value and press the button, i want a datagrid to be filled. The following code runs: Dim connect As New Data.SqlClient.SqlConnection( _ "Server=SrvnameSQLEXPRESS;Integrated Security=True; UID= ;password= ; database=dtbsname") connect.Open() Dim cmd As New SqlCommand Dim valor As New SqlParameter("@valor", SqlDbType.VarChar, 50) cmd.CommandText = "Ver_Contactos_Reducido" cmd.CommandType = CommandType.StoredProcedure cmd.Connection = connect cmd.Parameters.Add(valor) cmd.Parameters("@valor").Value = texto Dim adapter As New SqlDataAdapter(cmd) Dim ds As New System.Data.DataSet() adapter.Fill(ds) GridViewContactos.DataSource = ds GridViewContactos.DataBind() connect.Close() I drag a datagrid on the page and only changed its Id. Into the SQL database the stored procedure is the following: ALTER PROCEDURE [dbo].[Ver_Contactos_Reducido] (@Valor VARCHAR(100)) AS BEGIN SET NOCOUNT ON; SELECT NombreRazonSocial, Nombre, Apellido,TelefonoLaboral, Interno, TelefonoCelular, Email1, Organizacion FROM CONTACTOS WHERE NombreRazonSocial = @Valor OR Nombre = @Valor OR Apellido = @Valor OR TelefonoLaboral = @Valor OR Interno = @Valor OR TelefonoCelular =@Valor OR Email1 = @Valor OR Organizacion= @Valor END When i run the page i can't see the datagrid, and after i enter a text and press the button, nothing happens. What am i doing wrong?? Thks!!
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conn = new SqlCeConnection("Data Source=\sample.sdf; Password =''"); dt = new DataTable(); da = new SqlCeDataAdapter(Quary, conn); da.Fill(dt); DataaGrid1.Datasource=dt;
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CREATE VIEW [dbo].[v_stock] AS SELECT tab_products.productname, tab_productdetails.description, tab_productdetails.image, tab_productdetails.price, tab_productdetails.stock FROM tab_productdetails INNER JOIN tab_products ON tab_productdetails.productid = tab_products.productid
The problem I am having is then returning the data from this query into a data grid, I think the reason is because when I attached the stored procedure to a table and then call that procedure via the table adapter there is a mismatch of the schema - specifically the table it is attached to does not contain the column "productName".
I am thinking I need to create a temporary table to fill the data grid with - however, I am not sure how I would create a temporary table.
Is there something I am missing or not done correctly. As far as I can tell the queries work as when I preview them they produce the expected results.
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I have tried to code a href link to bind the data from a Stored Procedure, as shown below.This herf string failed. How to use these special characters, ' < " > ) ?Or how can I use sb(string builder), which I have used successfully for display the data. TIA,Jeffrey<%cmd.CommandText = "MyProgramsA"cmd.CommandType = CommandType.StoredProcedurecmd.Parameters.Add(New SqlParameter("@meid", SqlDbType.Int))cmd.Parameters("@meid").Value = EmpIdcmd.Connection = sqlConnection2sqlConnection2.Open()reader4 = cmd.ExecuteReader()While reader4.Read()%> <a href="http://sca3a56/'<% reader4(i).ToString() %>' "><% Response.Write(sb3) %></a><br /> <br />
I am trying to set a variable to be passed to my asp page but the value is not carrying over. I don't even know if this is supposed to work or not below: <td colspan="3" style="font-size: 10pt; vertical-align: top; color: <%=Div7fontcolor%>; background-color: <%=Div7bgcolor%>; text-align: center; width: 0px;" id="TopBox" runat="server">
The above Div7fontcolor and Div7bgcolor are variables that I set in the VB file as shown below: Dim obConnection As SqlConnection = New SqlConnection("Data Source=localhostsqlexpress;Initial Catalog=OrgBoard;Integrated Security=True")Dim obCommand As SqlCommand = New SqlCommand("SELECT Divisions.*, Dept19.*, Dept20.*, Dept21.*, ConfigDisplay.* FROM Divisions CROSS JOIN Dept19 CROSS JOIN Dept20 CROSS JOIN Dept21 CROSS JOIN ConfigDisplay", obConnection) obConnection.Open()Dim dr As SqlDataReader = obCommand.ExecuteReader() dr.Read() Dim Div7bgcolor As String = dr("Div7color").ToString().Trim()Dim Div7fontcolor As String = dr("Div7textcolor").ToString().Trim() dr.Close() obConnection.Close()
The web page runs fine with no errors but the value does not carry over and change the property correctly. I am able to set the bgColor value of the TopBox within the VB file if I use "TopBox.BgColor = Div7bgcolor" but I can't set other values on my web page like the font color. If I can do this from the VB file then please correct me. Using variables within the page will allow me to set almost any value but I don't even know if what I want is possible. Any help is greatly apprectiated. Thank you,
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Even if i am running simple data flow tasks on a multi processor machine, should I change the engine thread?
I have the following code: Imports System Imports System.Data.SqlClient
Namespace TestWeb
Partial Class araging
Inherits System.Web.UI.Page
Private _dt As DataTable Private _connstr As String
#Region " Web Form Designer Generated Code "
'This call is required by the Web Form Designer. <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
End Sub
Private Sub Page_Init(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Init 'CODEGEN: This method call is required by the Web Form Designer 'Do not modify it using the code editor. InitializeComponent() End Sub
#End Region
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
Dim _connstr As New SqlConnection(ConfigurationManager.ConnectionStrings("ESQLConn").ConnectionString)
Dim sqlCommand As SqlCommand = New SqlCommand("csp_rpt_ack_form", _connstr)
Dim ds As New DataSet objaDapter.Fill(ds) mainGrid.DataSource = ds mainGrid.DataBind()
Response.Write(_connstr)
End Sub
End Class
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I have a table which stores all prices for companies daily trading. Companies ABC & XYZ have information available for what was the high & low values for a DateID.
CREATE TABLE [dbo].[TestGrid] ( [ID] [int] IDENTITY(1,1) NOT NULL, [CompanyName] [varchar](200) NOT NULL, [DateID] [int] NOT NULL, [High] [float] NOT NULL, [Low] [float] NOT NULL
[code]...
What I'm trying to do is turn the DateID into columns and then as a additional change those columns represent the actual day of the Date ID How would i know 20121201 is equal to say Monday and 02 is Tuesday?
END RESULT:
NAME TYPE MONDAY TUESDAY WEDNESDAY ABC HIGH 0.5 0.6 1 ABC LOW 0.1 1.5 0.6
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I found this when doing a demo on the AdventureWorks demo extracting data from the SalesOrderDetail table. If you sort on the OrderQty column, data is correctly sorted in ascending quantities. However, if you click the column again, orders with an order quantity of 2 are displayed on top (while there are orders with a much higher order quantity) and if you scroll down the list, you notice that there is no clear sorting anymore. The same happens with other columns.
Is this supposed to work as I would expect it to do or is there a logical explanation for the behaviour I see?
-- Best regards,
Hans Geurtsen Docent Kenniscentrum
Info Support De Smalle Zijde 39 3903 LM Veenendaal The Netherlands www.infosupport.nl
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