Question

我有一个代码，它将从mysql数据库填充组合框。组合框将显示状态=＆＃39; YES＆＃39;的所有组织。但是如果我将状态从NO更改为YES，则后续的组合框不会加载它。

这是我的组合框代码：

string sql = "SELECT orgAbbrev FROM courseandorg WHERE status = 'YES'";
            conn.Open();
            MySqlCommand cmd = new MySqlCommand(sql, conn);
            MySqlDataReader rd = cmd.ExecuteReader();

              while (rd.Read())
            {

                cboOrg.Items.Add(rd["orgAbbrev"].ToString());
                cboOrg.ValueMember = rd["orgAbbrev"].ToString();
                cboOrg.DisplayMember = rd["orgAbbrev"].ToString();

            }
            conn.Close();

这里是按钮的代码，我将更改状态：

        try
        {
            conn.Open();
            string sql1 = "UPDATE courseandorg SET status = @status WHERE connID = @connID";
            MySqlCommand cmd1 = new MySqlCommand(sql1, conn);

            cmd1.Parameters.AddWithValue("@connID", textBox1.Text);   
            cmd1.Parameters.AddWithValue("@status", comboBox1.Text);

            cmd1.ExecuteNonQuery();
            Showlist();  //This is my funtion in  my datagridview

        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
        }
        conn.Close();

Answer 1

以这种方式更改您的代码

第一部分

private void your_func()
    {
        string sql = "SELECT orgAbbrev FROM courseandorg WHERE status = 'YES'";
        conn.Open();
        MySqlCommand cmd = new MySqlCommand(sql, conn);
        MySqlDataReader rd = cmd.ExecuteReader();

        while (rd.Read())
        {

            cboOrg.Items.Add(rd["orgAbbrev"].ToString());
            cboOrg.ValueMember = rd["orgAbbrev"].ToString();
            cboOrg.DisplayMember = rd["orgAbbrev"].ToString();

        }
        conn.Close();
    }

第二部分

        try
    {
        conn.Open();
        string sql1 = "UPDATE courseandorg SET status = @status WHERE connID = @connID";
        MySqlCommand cmd1 = new MySqlCommand(sql1, conn);

        cmd1.Parameters.AddWithValue("@connID", textBox1.Text);   
        cmd1.Parameters.AddWithValue("@status", comboBox1.Text);

        cmd1.ExecuteNonQuery();
        Showlist();  //This is my funtion in  my datagridview
        your_func(); //This is new change
        conn.Close();
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message);
    }

随后的组合框没有加载我所做的更改

1 个答案: