Question

我有一个datagridview，它在表单加载事件上加载mysql数据库表t_pi_clients，我有另一个选项卡，其中包含t_pi_client各列的文本框，可以将数据从fullrowselect模式获取到这些文本框中。现在我想在更改这些文本框值时更新数据库。到目前为止，我已经尝试了一些过程，并且保存了我的＆＃34;条目＃34; messageBox.show但数据库没有任何反应，所以我希望有人可以帮助我，也许我错过了一些感谢

public partial class frmMain : Form
{

    MySqlConnection connection;
    MySqlDataAdapter mySqlDataAdapter;
    DataSet dt = new DataSet();
    DataSet DS = new DataSet();
    DataSet dg = new DataSet();

    public frmMain()
    {
        InitializeComponent();
    }


    #region Main load
    private void frmMain_Load(object sender, EventArgs e)
    {

        var connectionString = ConfigurationManager.ConnectionStrings["Pigen"].ConnectionString;

        connection = new MySqlConnection(connectionString);

        if (this.OpenConnection() == true)
        {
            mySqlDataAdapter = new MySqlDataAdapter("select * from t_pi_Clients", connection);
            DataSet DS = new DataSet();
            mySqlDataAdapter.Fill(DS);
            kryptonDataGridView1.DataSource = DS.Tables[0];
            kryptonDataGridView1.Columns[0].Visible = false;


            mySqlDataAdapter = new MySqlDataAdapter("select * from t_pi_msg_charge_Rate", connection);
            DataSet dt = new DataSet();
            mySqlDataAdapter.Fill(dt);
            kryptonDataGridView2.DataSource = dt.Tables[0];


            mySqlDataAdapter = new MySqlDataAdapter("select * from t_pi_client_deposits", connection);
            DataSet dg = new DataSet();
            mySqlDataAdapter.Fill(dg);
            kryptonDataGridView3.DataSource = dg.Tables[0];

        }


    } 
          //loads selected row data into textboxes
      private void kryptonDataGridView1_DoubleClick(object sender, EventArgs e)
    {
        textboxClientCode.Text = kryptonDataGridView1.SelectedRows[0].Cells["ClientCode"].Value.ToString();
        txtboxClientName.Text = kryptonDataGridView1.SelectedRows[0].Cells["ClientName"].Value.ToString();
        txtboxPostalAddress.Text = kryptonDataGridView1.SelectedRows[0].Cells["PostalAdd"].Value.ToString();
        txtboxTelephone.Text = kryptonDataGridView1.SelectedRows[0].Cells["Telephone"].Value.ToString();
        txtboxFax.Text = kryptonDataGridView1.SelectedRows[0].Cells["Fax"].Value.ToString();
        txtboxEmailAddress1.Text = kryptonDataGridView1.SelectedRows[0].Cells["EmailAdd1"].Value.ToString();
        txtboxEmailAddress2.Text = kryptonDataGridView1.SelectedRows[0].Cells["EmailAdd2"].Value.ToString();
        txtboxEmailAddress3.Text = kryptonDataGridView1.SelectedRows[0].Cells["EmailAdd3"].Value.ToString();
        txtboxWebsite.Text = kryptonDataGridView1.SelectedRows[0].Cells["Website"].Value.ToString();
        txtboxChargeRate.Text = kryptonDataGridView1.SelectedRows[0].Cells["ChargeRate"].Value.ToString();
        txtboxTotalDepo.Text = kryptonDataGridView1.SelectedRows[0].Cells["TotalDeposit"].Value.ToString();
        txtboxAccountBal.Text = kryptonDataGridView1.SelectedRows[0].Cells["AccountBal"].Value.ToString();
        txtboxEntrydate.Text = kryptonDataGridView1.SelectedRows[0].Cells["EntryDate"].Value.ToString();


    }

现在我尝试使用此方法进行更新，但不会更新数据库

private void kryptonbtnUpdate_Click(object sender, EventArgs e)
    {
        var connectionString = ConfigurationManager.ConnectionStrings["Pigen"].ConnectionString;

        using (MySqlConnection Conn = new MySqlConnection(connectionString))


            if (Conn.State.ToString() != "Open")
            {

            }
            else
            {
                connection.Open();

            }

        try
        {
            DataTable changes = ((DataTable)kryptonDataGridView1.DataSource).GetChanges();
            if (changes != null)
            {
                MySqlCommandBuilder mcb = new MySqlCommandBuilder(mySqlDataAdapter);
                mySqlDataAdapter.UpdateCommand = mcb.GetUpdateCommand();
                mySqlDataAdapter.Update(changes);
                ((DataTable)kryptonDataGridView1.DataSource).AcceptChanges();
                mySqlDataAdapter.Update(DS);
            }

            //        adapter.Update(rowsToUpdate);

            //   mySqlDataAdapter.Update(DS);



            MessageBox.Show("Entry Saved");
        }

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

Answer 1

这只是你需要做的伪代码

string cmdText = @"UPDATE t_pi_Clients
                 SET ClientName = @ClientName,
                     PostalAdd = @PostalAdd,
                     Telephone = @Telephone,
                     Fax = @Fax,
                     .... etc ....
                 WHERE ClientCode = @ClientCode";
using(MySqlConnection cn = new MySqlConnection(.....))
using(MySqlCommand cmd = new MySqlCommand(cmdText, cn))
{
    cn.Open();
    cmd.Parameters.AddWithValue("@ClientName", txtboxClientName.Text);
    cmd.Parameters.AddWithValue("@PostalAdd", txtboxPostalAddress.Text);
    ....etc etc...
    cmd.Parameters.AddWithValue("@ClientCode", textboxClientCode.Text);
    int rowsUpdated = cmd.ExecuteNonQuery();
    if(rowsUpdated > 0) 
    {
        // extract the code that loads DataGridView1 from the Form_Load
        // and create a reusable method that you could call from here
    }
}

首先使用UPDATE子句构建sql命令文本。我假设您的主键（唯一标识您的记录的字段）是ClientCode字段。

然后创建连接和命令。使用TextBox中的值从文本所需的参数填充命令参数集合调用ExecuteNonQuery来存储值。

如果您成功，则需要更新或重新加载数据网格视图。最好的方法是使用文本框中的新值逐个设置当前行的gridview单元格，或者您可以简单地提取form_load中使用的代码来填充网格并创建一个可以从按钮调用的新方法点击事件。（但如果你有很多记录，这可能会更慢）

从datagridview选中的行更新mysql数据库

1 个答案: