『原创』C#中TreeView类操作全攻略:建立树，新增节点，删除节点，修改节点，拖动节点，与Oracle数据库交互操作（一）

『原创』C#中TreeView类操作全攻略:建立树，新增节点，删除节点，修改节点，拖动节点，与Oracle数据库交互操作（一）(31)      cmd.Transaction = myTran;
     cmd.Connection =funcTableConn;
     cmd.ExecuteNonQuery ();
     myTran.Commit ();
    }
    catch(Exception ee)
    {
     try
     {
      myTran.Rollback();
     }
     catch (OracleException ex)
     {
      if (myTran.Connection != null)
      {
       MessageBox.Show ("在回滚时发生 " + ex.GetType() +" 异常！",
        "警告",System.Windows.Forms.MessageBoxButtons.OK,
        System.Windows.Forms.MessageBoxIcon.Warning);
      }
     }
 
     MessageBox.Show ("发生" + ee.GetType() +
      "异常\n" +"修改记录失败！","警告",System.Windows.Forms.MessageBoxButtons.OK,
      System.Windows.Forms.MessageBoxIcon.Warning);
    }
    finally
    {
     funcTableConn.Close();
    }
    //数据库更新完毕！
   }
  }

  }

  private void trv_Function_DragEnter(object sender, System.Windows.Forms.DragEventArgs e)
  {
   e.Effect = DragDropEffects.Move;
  }

  private void trv_Function_DragOver(object sender, System.Windows.Forms.DragEventArgs e)
  {
   Point position=new Point(0,0);
   position.X  =  e.X  ;