Solved

c#.NET Create Dynamic SQL statement from info in a URL OnClick

Posted on 2004-09-28
4
263 Views
Last Modified: 2010-04-15
I have two pages:
The first page displays an image, the image is a map of london, I have used an image map to cut up the districts on the map. The idea is that a user clicks a district and go to a new page (page two) containing the areas within that district.
I have a mssql database with the info for the districts/areas setup and working fine.
My current code and SQL query that is performed when a user clicks a district is:

<script language="C#" runat="server">
   void Page_Load(Object sender, EventArgs e)
   {
     
     
        SqlConnection myConnection = new SqlConnection("server=localhost;" +
         "database=ldc;Trusted_Connection=Yes");

      SqlDataAdapter myCommand = new SqlDataAdapter("SELECT * FROM" +
         " MapLocations where district='camden'", myConnection);
     
     
      DataSet ds = new DataSet();
      myCommand.Fill(ds);
     
      MyRepeater.DataSource = ds;
      MyRepeater.DataBind();
   }
</script>

I want to change the SQL query so that it populates district= with the name of the district the user clicked on the previous page.

I tried something along the line of:

SqlDataAdapter myCommand = new SqlDataAdapter("SELECT * FROM" +
         " MapLocations where district=Response.Write([id])", myConnection);

Where id would be passed in the URL   such as  map.aspx?id=OxfordCircus

all the data in the dbase is vchar.

But it fails....is there some easy way of doing this so i dont have to create 30 separate aspx files containing 30 unique sql queries to reflect the 30 different districts in london...?
0
Comment
Question by:HoomanJamshidiNHE
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
4 Comments
 
LVL 15

Expert Comment

by:praneetha
ID: 12174949
change it !Page.IsPostback..

ad when u r passing the id in the url..it is accessed

using Request.QueryString["id"].toString()....now you shoul dbe able to use it

SqlDataAdapter myCommand = new SqlDataAdapter("SELECT * FROM" +
         " MapLocations where district="+Request.querystring["id"].ToString(), myConnection);

<script language="C#" runat="server">
   void Page_Load(Object sender, EventArgs e)
   {
      if(!Page.ispostback) //change that to not postback
{
     
       SqlConnection myConnection = new SqlConnection("server=localhost;" +
         "database=ldc;Trusted_Connection=Yes");

      SqlDataAdapter myCommand = new SqlDataAdapter("SELECT * FROM" +
         " MapLocations where district='camden'", myConnection);
     
     
      DataSet ds = new DataSet();
      myCommand.Fill(ds);
     
      MyRepeater.DataSource = ds;
      MyRepeater.DataBind();
}
   }
</script>
0
 
LVL 5

Expert Comment

by:tomasX2
ID: 12174960
string id = whatever your id is... // don´t think you can get it from response.write.....
string select = "SELECT * FROM MapLocations where district='" + id + "'";
SqlDataAdapter myCommand = new SqlDataAdapter(select , myConnection);
0
 
LVL 5

Accepted Solution

by:
tomasX2 earned 500 total points
ID: 12174972
string id would probably be something like so...


string id = Request["id"].ToString();
string select = "SELECT * FROM MapLocations where district='" + id + "'";
SqlDataAdapter myCommand = new SqlDataAdapter(select , myConnection);
0
 

Author Comment

by:HoomanJamshidiNHE
ID: 12177960
thanks man....that saves me tons of time.
0

Featured Post

On Demand Webinar: Networking for the Cloud Era

Did you know SD-WANs can improve network connectivity? Check out this webinar to learn how an SD-WAN simplified, one-click tool can help you migrate and manage data in the cloud.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Article by: Najam
Having new technologies does not mean they will completely replace old components.  Recently I had to create WCF that will be called by VB6 component.  Here I will describe what steps one should follow while doing so, please feel free to post any qu…
We all know that functional code is the leg that any good program stands on when it comes right down to it, however, if your program lacks a good user interface your product may not have the appeal needed to keep your customers happy. This issue can…
This video Micro Tutorial shows how to password-protect PDF files with free software. Many software products can do this, such as Adobe Acrobat (but not Adobe Reader), Nuance PaperPort, and Nuance Power PDF, but they are not free products. This vide…
In this video we outline the Physical Segments view of NetCrunch network monitor. By following this brief how-to video, you will be able to learn how NetCrunch visualizes your network, how granular is the information collected, as well as where to f…

688 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question