access data frm table when index change of ddl

Question

0.00/5 (No votes)

See more:

i want to access data from database table at the selected index change of dropdownlist & show on to the existing label for which

I write a code as follow where ddlweek7 is Dropdownlist & initials starting from lbl are the labels

C#

protected void DDLWEEK7_SelectedIndexChanged(object sender, EventArgs e)
    {

OleDbConnection con = new OleDbConnection("Provider=MSDAORA;User ID=sd;password=s321;Data Source=User");
    
 OleDbCommand cmd3 = new OleDbCommand("SELECT d1  FROM VIPUL_DATE WHERE dw=@p1"+DDLWEEK7.SelectedItem, con);
    
 con.Open();
     
OleDbParameter op = new OleDbParameter();
     op.ParameterName = "@p1";
     op.Value = DDLWEEK7.SelectedItem.ToString();
     cmd3.Parameters.Add(op);

OleDbDataReader DR1= cmd3.ExecuteReader();

       
lblfrmdt.Text+=DR1.ToString();

}

for this i got the error as [One or more errors occurred during processing of command.ORA-00936: missing expression]

Posted 27-Jul-11 18:28pm

vipul_aug_1988

Updated 27-Jul-11 19:53pm

walterhevedeich

v2

Add a Solution

2 solutions

Solution 1

Not sure why you are concatenating a value on your query while you have specified a parameter on it. Try replacing the code of your OleDbCommand to this.

C#

OleDbCommand cmd3 = new OleDbCommand("SELECT d1  FROM VIPUL_DATE WHERE dw=@p1", con);

Also, this (op.Value = DDLWEEK7.SelectedItem.ToString();) will only return the type of the selected item, which is ListItem, and not the value. Im not sure about your purpose of using this. Try using DDLWEEK7.SelectedValue instead. Or if you want the index of the selected item, use DDLWEEK7.SelectedIndex property. Refer here[^] for more details about the DropDownList class.

Posted 27-Jul-11 20:00pm

walterhevedeich

Updated 27-Jul-11 20:03pm

v2

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Al Moje · Accepted Answer · 2011-07-27T20:23:00

Hi,

Your code is not clear...
What is you objectives?
Maybe you want to retrieve one record in oracle table.
Right?... If so...
See this example:

In you Web.config:

   <connectionStrings>
  <add name="ORAConnection" connectionString="Provider=MSDAORA;Data Source=User;User ID=sa;Password=s321"/>
</connectionStrings>

In your code behind:

string OraConn = ConfigurationManager.ConnectionStrings["ORAConnection"].ConnectionString;  
   //string retVal = string.empty;   
   OleDbConnection oconn;
   OleDbCommand ocmd;
   OleDbDataReader odr;
   try
   {
       using (oconn = new OleDbConnection(OraConn))
       {
           oconn.Open();
           string query = "SELECT d1 FROM VIPUL_DATE WHERE dw ='" + UserId + "'";
           using (ocmd = new OleDbCommand(query, oconn))
           {
               OleDbDataReader odr = ocmd.ExecuteReader();
               if (odr.Read())
               {
                  retVal = odr["d1"].ToString();  // U should handle this if null...
               }
           }
      }
   }
   
   catch(Exception ex)
   {
        throw ex;
   }
   lblfrmdt.Text = retVal;

Regards,

Algem