数据库连接备忘

  string dataFile = Path.GetDirectoryName(Process.GetCurrentProcess().MainModule.FileName)+"\\CustomaryOrder.accdb";         
        private void btnLogin_Click(object sender, EventArgs e)
        {
            //string connStr = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + AppDomain.CurrentDomain.BaseDirectory + "CustomaryOrder.accdb;Persist Security Info=True";

            //连接数据库
            OleDbConnection con = new OleDbConnection();
            //Access 2007
            con.ConnectionString = "Provider=Microsoft.ACE.OLEDB.12.0;Jet OLEDB:Database Password=123456;Data Source="+dataFile+"";
            con.Open();
            OleDbCommand cmd = new OleDbCommand();
            cmd.Connection = con;
            cmd.CommandText = "select * from Login";//1是表名
            OleDbDataReader reader = cmd.ExecuteReader();
            while (reader.Read())
            {
                string str=reader.GetValue(1).ToString();
            }
            reader.Close();
            con.Close();

            panelLogin.Hide();
            FrmCustomaryOrder myFrm = new FrmCustomaryOrder();
            myFrm.MdiParent= this;
            myFrm.WindowState = FormWindowState.Maximized;
            myFrm.Show();
        }