如何从Datagridview C＃更新数据库

Question

How to update DB from Datagridview c# ? My project is work for load data table in DB.but can't update into DB It's load data button

private void button2_Click(object sender, EventArgs e)
{
        string connectionString;

        connectionString = "Server=localhost;User Id=root; Password=1234; Database=db2; Pooling=false;CharSet=tis620;";
        connection = new MySqlConnection(connectionString);
        sda = new MySqlDataAdapter("Select * from data Where Id = '" + comp.Text.Trim() + "'", connection);

        dt = new DataTable();
        sda.Fill(dt);
        Table1.DataSource = dt;

}

and update button

private void button3_Click(object sender, EventArgs e)
{

        cmdbl = new MySqlCommandBuilder(sda);

        sda.Update(dt);
        MessageBox.Show("Save data complete");

}

I follow this clip Insert,Delete and Update data in database from datagridview and i can't do it Sorry for my english I speak not good enough and thank you for answer.

Answer 1

Assuming you have UpdateCommand configured. try dt.AcceptChanges() after update

private void button3_Click(object sender, EventArgs e)
{

    cmdbl = new MySqlCommandBuilder(sda);

    sda.Update(dt);
    dt.AcceptChanges()
    MessageBox.Show("Save data complete");

  }

Otherwise follow the MSDN

As a minimum requirement, you must set the SelectCommand property in order for automatic command generation to work. The table schema retrieved by the SelectCommand property determines the syntax of the automatically generated INSERT, UPDATE, and DELETE statements. The DbCommandBuilder must execute the SelectCommand in order to return the metadata necessary to construct the INSERT, UPDATE, and DELETE SQL commands. As a result, an extra trip to the data source is necessary, and this can hinder performance. To achieve optimal performance, specify your commands explicitly rather than using the DbCommandBuilder. The SelectCommand must also return at least one primary key or unique column. If none are present, an InvalidOperation exception is generated, and the commands are not generated.