Question

我有一个DataGridView，其中包含以下代码;请注意，代码仅包含重要部分以简洁起见。 gridview填充得很好，但更新代码是我需要帮助的。

Dim da As OleDbDataAdapter
Dim ds As DataSet

Private Sub Form1_Load(ByVal sender As System.Object,
                       ByVal e As System.EventArgs) Handles MyBase.Load
  Try
    'open database
    conn.Open()

    'get query data
    Dim cmd As OleDbCommand = New OleDbCommand(
      "SELECT student_name.matric_no,student_name.sname, student_name.fname," &
      "result_sheet.course_title,result_sheet.test_score,result_sheet.exam_score,result_sheet.total_score" &
      " FROM student_name INNER JOIN result_sheet ON student_name.matric_no = result_sheet.matric_no  ", conn)

    da = New OleDbDataAdapter(cmd)
    Dim builder As OleDbCommandBuilder = New OleDbCommandBuilder(da)

    ds = New DataSet()

    da.Fill(ds)
    da.Dispose()

    Dim usertable As DataTable = ds.Tables(0)

    'datasource of the datagrid
    Dview1.DataSource = usertable

    'change the data grid column name
    Dview1.Columns(0).HeaderText = "MATRIC NUMBER"
    Dview1.Columns(1).HeaderText = "SURNAME"
    Dview1.Columns(2).HeaderText = "FIRST NAME"

    conn.Close()
  Catch ex As Exception
    'display message
    MsgBox(ex.ToString)

  End Try
End Sub

我更新GridView的代码如下;

Private Sub update_btn_Click(ByVal sender As System.Object,
                             ByVal e As System.EventArgs) Handles update_btn.Click
  Try
    da.Update(ds.Tables(0))
  Catch ex As Exception
    'display message
    MsgBox(ex.ToString)
  End Try
End Sub

点击“更新”按钮后出现的错误是：The DataAdapter.SelectCommand property needs to be initialized.

请问，我该如何解决这个问题？

如何更新填充了两个数据库表的DataGridView

0 个答案: