Question

代码似乎很好但是当我点击它时，没有任何反应。谢谢！

private void button2_Click(object sender, EventArgs e)
    {
        MySqlDataAdapter da = new MySqlDataAdapter();
        da.SelectCommand = new MySqlCommand("select * from poitems", coninsert);
        MySqlCommandBuilder cb = new MySqlCommandBuilder(da);
        DataSet ds = new DataSet();
        da.Fill(ds, "poitems");
        da.Update(ds, "poitems");
        //DataTable dt1 = new DataTable();
        //da.Fill(dt1);
        //da.Update(dt1);


        //dtgPo.DataSource = dt1;
    }

Answer 1

您没有更新数据集中的任何内容，请查看以下示例更新代码

MySqlConnection conn = new MySqlConnection(connectionString);
MySqlDataAdapter da = new MySqlDataAdapter("SELECT * FROM Test", conn);
MySqlCommandBuilder cb = new MySqlCommandBuilder(da, true);
DataTable dt = new DataTable();
da.Fill(dt);
//update datatable
dt.Rows[0][0] = "my changed value";
DataTable changes = dt.GetChanges();
//call update 
da.Update(changes);
dt.AcceptChanges();

命令构建器更新不起作用

1 个答案: