Update statement does nothing-CodePudding

When I enter a number in the ChbBeds_numericUpDown and click on the "Update" button, it says "Data Updated", but nothing changes in the database

private void ChbUp_button_Click(object sender, EventArgs e)
{
    try 
    {
        string statement = "UPDATE ChamberXPavilions SET Beds count = @beds_count WHERE Pav_name = @pav_name AND Chamber_number = @chamber_number";

        cmd = new OleDbCommand(statement, conn);

        cmd.Parameters.AddWithValue("@pav_name", Chbpav_comboBox.Text);
        cmd.Parameters.AddWithValue("@chamber_number", Chb_numericUpDown.Value);
        cmd.Parameters.AddWithValue("@beds_count", ChbBeds_numericUpDown.Value);

        conn.Open();
        cmd.ExecuteNonQuery();
        conn.Close();

        MessageBox.Show("Data updated");
        showdata();
    }
    catch(Exception ex)
    {
        MessageBox.Show(ex.ToString());
    }
}

Is the SQL statement wrong ?

CodePudding user response：

Contrary to SQL Server, the OleDB provider for MS Access does NOT work with named parameters - instead, it uses positional parameters.

In your case, you have a SQL statement

UPDATE ChamberXPavilions 
SET Beds count = @beds_count 
WHERE Pav_name = @pav_name AND Chamber_number = @chamber_number

so you need to also provide the parameters in the same order - first @beds_count, then @pav_name and finally @chamber_number.

So try this for providing the parameter values:

cmd = new OleDbCommand(statement, conn);

cmd.Parameters.AddWithValue("@beds_count", ChbBeds_numericUpDown.Value);    
cmd.Parameters.AddWithValue("@pav_name", Chbpav_comboBox.Text);
cmd.Parameters.AddWithValue("@chamber_number", Chb_numericUpDown.Value);

Now, your UPDATE statement should get the proper values and should now work