Cannot Update Record In Database.

May 4, 2004

Hello,





I was stuck when update database using SqlDataAdapter. I have several textboxes in my webform1. When wepform1 is loaded, they will display user's information. The user can only input content in two textboxes. When user clicks the update button, I hope to update this record in SQL Server 2000 database. However, the program didn't work. There was no error message reported but when I stepped into the code, I found out that dataadapter's update method didn't succeed. I got 0 rows affected. Can I get some advice from someone ?





Here is the code:





string StrUpdateCmd = "Update Table1 Set Hphone = @Hphone, Cphone = @Cphone, Team = @Team Where emailname =@emailname ";





SqlDataAdapter UpdateDa = new SqlDataAdapter("Select * from Table1",SqlConnection1);


UpdateDa.UpdateCommand = new SqlCommand(StrUpdateCmd, SqlConnection1);





//Add parameters of update command.


SqlParameter prm1 = UpdateDa.UpdateCommand.Parameters.Add("@Hphone",SqlDbType.NVarChar, 16);


prm1.Value = txtHphone.Text ;





SqlParameter prm2 = UpdateDa.UpdateCommand.Parameters.Add("@Cphone",SqlDbType.NVarChar, 16);


prm2.Value = txtCphone.Text ;





SqlParameter prm3 = UpdateDa.UpdateCommand.Parameters.Add("@Team",SqlDbType.NVarChar, 16);


prm3.Value = this.DropDownList1.SelectedItem.Value ;





SqlParameter prm4 = UpdateDa.UpdateCommand.Parameters.Add("@emailname",SqlDbType.NVarChar, 50);


prm4.Value = txtEmail.Text;





try


{


DataSet dataset2 = new DataSet();





//Open database connection.


SqlConnection1.Open();


dataset2.Clear();


UpdateDa.Fill(dataset2, "Table1");





this.DataGrid1.DataSource = dataset2.Tables[0] ;


DataGrid1.DataBind ();





//Update database


int ret =UpdateDa.Update(dataset2,"Table1");


if( ret == 1 )


{


ShowMessage("Update succeed!");


}


else


{


ShowMessage("There is an error in updating ");


}





UpdateDa.Fill(dataset2);





//Show data after update.


this.DataGrid1.DataSource = dataset2;


DataGrid1.DataBind ();


}


catch (Exception ex)


{


throw ex;


}


finally


{


sqlConnection1.Close();


}

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I tried...Me.CustomerDataSource.SelectCommand = "UPDATE tbl_customers SET company = '" & companyTextBox.Text & "' WHERE recno = @recno"
But I get the error:
Exception Details: System.Data.SqlClient.SqlException: Must declare the scalar variable "@recno".
Can anyone provide this simple query clause?

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Update A Record After A Cetain Time

Jul 1, 2001

We have a website that allows people to enter tasks and they are then given a stageID. ie 1 which is review for when they are first entered into our database. If they have not been reviewed in 5 minutes I want them to update automatically and move onto the next stage. I have tried using a stored procedure that adds the reocrd with a waitfor command but that doesn't work because it locks the connection ofcourse until it's finished the stored procedure which means the webpage doesn't come back for 5 minutes which we don't need. I'm asking if there is any other way I can do this without a waitfor command or somehow use it so that it doesn't hold the current connection.

Thanks for your help

Jason

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