从数据库获取多个值，并在索引更改C＃时显示在组合框和不同的文本框中

Question

   try
        {
           // var model =Execute.q"SELECT product.id, product.productName, product.unitId, product.productCode, units.name FROM product INNER JOIN units ON product.unitId = units.id";

            string query1 = "SELECT product.id, product.productName, product.unitId, product.productCode, units.name FROM product INNER JOIN units ON product.unitId = units.id";
            command = DBConnectivity.getCommandForQuery(query1, connection);
            dataset = new DataSet();
            adapter = new SqlDataAdapter(command);
            adapter.Fill(dataset);
            int reslut = command.ExecuteNonQuery();
            this.cBproductName.DisplayMember = "productName";
            this.cBproductName.ValueMember = "id";
            datarow = dataset.Tables[0].NewRow();
            datarow["productName"] = "Select Product";
            dataset.Tables[0].Rows.InsertAt(datarow, 0);
            this.cBproductName.DataSource = dataset.Tables[0];
        }

        catch (Exception ex)
        {
            Console.WriteLine(ex.Message);

        }
 private void cBproductName_SelectedIndexChanged(object sender, EventArgs e)
    {
        if (this.cBproductName.SelectedValue != null)
        {
            txtProCode.Text = this.cBproductName.SelectedValue.ToString();

        }
    }

i want to show product code and the unit name in the text boxes against the id in the product table and on the change on selected index in the combo box cBproductName. my query give me all the values but unable to show in the form.

Answer 1

You can change the SQL statement to include the informations you need.

Like:

SELECT product.productName + ' ' + product.productCode + ' ' + units.name  AS ShowText, product.id, product.productName, product.unitId, product.productCode, units.name FROM product INNER JOIN units ON product.unitId = units.id

Change cBproductName_SelectedIndexChanged method to:

DataRow row = this.cBproductName.SelectedItem as DataRow;
if (row != null)
{
  txtProCode.Text = row["ShowText"].ToString();
}

The ComboBox i bound to a DataSet that contains DataRow elements.