從datagridview和datasource表中刪除選定的行

Question

我有一個刪除按鈕，就像我想從datagridview和acutual database中刪除單行一樣。我遇到的問題是在刪除所選行中。如果我不使用該參數，則表的內容將被刪除，我不有任何入門密鑰只是一個ID字段（AutoNumber）。有人可以通過sql語句幫助我嗎

我感謝您的幫助

enter code here
            Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click
        If Not DataGridView1.CurrentRow.IsNewRow Then
        If DataGridView1.SelectedRows.Count = 0 Then
            MsgBox("No row was selected. If you are trying to remove a row, highlight the entire row by clicking on the identifier column            on the far left.", MessageBoxIcon.Error, "Entire Row Not Selected")

            ElseIf DataGridView1.SelectedRows.Count = 1 Then
            Dim response As DialogResult = MessageBox.Show("Are you sure you want to delete the selected row?", "Delete row?",                 MessageBoxButtons.YesNo, MessageBoxIcon.Question, MessageBoxDefaultButton.Button2)
            If (response = DialogResult.Yes) Then
                DataGridView1.Rows.Remove(DataGridView1.CurrentRow)

                Dim cn As OleDbConnection
                Dim cmd As OleDbCommand
                Dim cnstring As String = ("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\testdb1.accdb;Persist Security                     Info=False")
                Dim sqlstring As String = "Delete from sample where id = id"
                cn = New OleDbConnection(cnstring)
                cmd = New OleDbCommand(sqlstring, cn)
                cn.Open()
                cmd.ExecuteNonQuery()
                cn.Close()


                 End If
                  ElseIf DataGridView1.SelectedRows.Count > 1 Then
                  MsgBox("Multiple rows are currently selected. The remove function can only delete one row at a time. Please select a                      single row and try again.", MessageBoxIcon.Error, "Single Row Not Selected")
                 DataGridView1.ClearSelection()
                 End If
                 End If

                End Sub
                End Class
enter code here

Answer 1

在將數據從數據庫填充到datagridview時，也可以包括ID字段，但是在顯示數據時可以將其隱藏。 然后，當您要刪除數據時，您將具有ID以執行此操作。

例如，假設我們具有以下內容：

sqlcommand command = new sqlcommand("SELECT IDHuman,HumanName,... FROM tblHuman",connection)

現在，正如您所看到的，我們也有該ID，並且應按以下所示隱藏它：

datagridview1.cells[0].visible=false;

然后，當您要刪除它時，可以在WHERE子句中包含ID 。