从 datagridview 选定行更新 mysql 数据库

Question

我有一个数据网格视图，它在表单加载事件中加载 mysql 数据库 table t_pi_clients，我还有另一个选项卡，其中包含 t_pi_client 的各个列的文本框，它能够从全行选择模式获取数据到这些文本框中。现在我想根据这些文本框值的变化更新数据库。到目前为止，我已经尝试了一些过程并得到了我的 "entry saved" messageBox.show 但是数据库没有任何反应，所以我希望有人能帮助我，也许我遗漏了什么谢谢

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();


    }

现在我尝试了这种方法来更新但没有更新数据库

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

这只是您需要做的伪代码

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，您使用 UPDATE 子句构建一个 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。使用您的文本所需的参数填充命令参数集合，并从文本框中取值。
调用 ExecuteNonQuery 来存储值。

如果成功，则需要更新或重新加载数据网格视图。最好的方法是用文本框中的新值一个一个地设置当前行的 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新方法，您可以从按钮单击事件调用。（但如果你有很多记录，这可能会更慢）

从 datagridview 选定行更新 mysql 数据库

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c#

mysql

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winforms