Question

为我的办公室开发应用程序，在我的应用程序中有一个链接到mysql数据库的datagrid视图。本地用户可以使用datagridview更新数据库，但他们无法删除任何重新编码。我想实现一个方法，用户在datagridview中选择完全原始并删除它，以及尽快删除数据库记录。我设法使用下面的代码选择和删除datagridview行，但它不更新数据库

private void button60_Click(object sender, EventArgs e)
        {
            foreach (DataGridViewCell oneCell in dataGridView1.SelectedCells)
            {
                if (oneCell.Selected)
                    dataGridView1.Rows.RemoveAt(oneCell.RowIndex);
            }

        }

这是我通常用于在datagrid视图中查看数据库数据的连接字符串。我没有很好的知识将这两者结合起来。有人请告诉我如何做到这一点

我的连接字符串

private void showdatagrid（） {

        string constring = string.Format("datasource='{0}';username=******;port=3306;password=***********;Connect Timeout=20000;Command Timeout=28800", dbserverip.Text);
        MySqlConnection conwaqDatabase = new MySqlConnection(constring);
        MySqlCommand cmdwaqDatabase = new MySqlCommand(" select * from warit.loans ; ", conwaqDatabase);


        try
        {

            MySqlDataAdapter sda = new MySqlDataAdapter();
            sda.SelectCommand = cmdwaqDatabase;
            dbdataset = new DataTable();
            sda.Fill(dbdataset);
            BindingSource bsource = new BindingSource();

            bsource.DataSource = dbdataset;
            dataGridView1.DataSource = bsource;
            sda.Update(dbdataset);

        }


        catch (Exception ex)
        {


            MessageBox.Show(ex.Message);

        }

Answer 1

试试这段代码

private void button60_Click(object sender, EventArgs e)
{
    foreach (DataGridViewCell oneCell in dataGridView1.SelectedCells)
    {
        if (oneCell.Selected)
        {
            dataGridView1.Rows.RemoveAt(oneCell.RowIndex);
            int loannumber = dataGridView1.Rows[oneCell.RowIndex].Cells['index of loannumber column in datagridview'].Value; // assuming loannmber is integer
            string username = dataGridView1.Rows[oneCell.RowIndex].Cells['index of username column in datagridview'].Value; // assuming username is string
            /* Now create an object of MySqlConnection and MySqlCommand
             * and the execute following query
             */
            string query = string.Format("DELETE FROM table_name WHERE loannumber = {0} AND username = '{1}'", loannumber, username);
        }
    }

}

Answer 2

string connection = "server = URL; uid = user; pwd = password; database = database;";

using (MySqlConnection conn = new MySqlConnection(connection)) {

    conn.Open();

    string idLocRemv = dataGridView1.SelectedRows[0].Cells[0].Value.ToString();

    string removeVolCred = "DELETE FROM TableName WHERE ID = " + idLocRemv;

    using (MySqlCommand command = new MySqlCommand(removeVolCred, fbcConn)) {
        command.ExecuteNonQuery();
    }

    conn.Close();
}

应用必要的异常处理程序。（最后尝试抓住）

此外，您需要在之后重新加载DataGridView。

从datagrid视图中删除选定的行并在C＃中更新mysql数据库

2 个答案: