我在删除记录时遇到了一些问题。我将 VB.net 与 Access 数据库一起使用。当我尝试运行这个程序时没有错误,但记录没有在数据库中删除。有一个类可以删除记录,这个类将调用另一个方法,即 DeleteMultipleRecords。这是我的代码,希望任何人都可以帮助我解决这个问题。
-Default.aspx.vb-
Protected Sub btnDelete_Click(ByVal sender As Object, ByVal e As EventArgs) Handles btnDelete.Click
'create string collection to store IDs of records to be deleted
Dim idCollection As New StringCollection()
Dim strID As String = String.Empty
'Loop through GridView rows to find checked rows
For i As Integer = 0 To i < GridView1.Rows.Count - 1
Dim chkDelete As CheckBox = DirectCast(GridView1.Rows(i).Cells(0).FindControl("chkSelect"), CheckBox)
If chkDelete IsNot Nothing Then
If chkDelete.Checked Then
strID = GridView1.Rows(i).Cells(1).Text
idCollection.Add(strID)
End If
End If
Next
'called method to delete record
DeleteMultipleRecords(idCollection)
'rebind(GridView)
GridView1.DataBind()
End Sub
Private Sub DeleteMultipleRecords(ByVal idCollection As StringCollection)
'create connection
Dim cnnOLEDB As New OleDbConnection(strConnection)
Dim IDs As String = ""
'create string builder to store
'delete commands seperated by ;
For Each id As String In idCollection
IDs += id.ToString() & ","
Next
Try
Dim strIDs As String = IDs.Substring(0, IDs.LastIndexOf(""))
Dim strSql As String = ("Delete from Details WHERE ID = '" & strIDs & "' ")
cmdOLEDB.CommandType = CommandType.Text
cmdOLEDB.CommandText = strSql
cmdOLEDB.Connection = cnnOLEDB
cnnOLEDB.Open()
cmdOLEDB.ExecuteNonQuery()
cmdOLEDB.Dispose()
Catch ex As OleDbException
Dim errorMsg As String = "Error in Deletion"
errorMsg += ex.Message
Throw New Exception(errorMsg)
Finally
cnnOLEDB.Close()
End Try
End Sub
-Default.aspx-
<asp:GridView ID="GridView1" runat="server" AllowPaging="True"
DataSourceID="SqlDataSource1" AutoGenerateColumns="False" DataKeyNames="ID">
<Columns>
<asp:TemplateField HeaderText="Select">
<ItemTemplate>
<asp:CheckBox ID="chkSelect" runat="server" />
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField DataField="ID" HeaderText="ID" SortExpression="ID"/>
<asp:TemplateField HeaderText="Name"
SortExpression="Name">
<ItemTemplate>
<asp:TextBox ID="txtName" runat="server"
Text='<%# Bind("Name") %>' ReadOnly="true"
BorderStyle="none"
BorderWidth="0px" >
</asp:TextBox>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Location"
SortExpression="Location">
<ItemTemplate>
<asp:TextBox ID="txtLocation" runat="server"
Text='<%# Bind("Location") %>'
ReadOnly="true"
BorderStyle="none" BorderWidth="0px">
</asp:TextBox>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
<asp:SqlDataSource ID="SqlDataSource1" runat="server"
ConnectionString="<%$ ConnectionStrings:LabSystemDBConnectionString %>"
ProviderName="<%$ ConnectionStrings:LabSystemDBConnectionString.ProviderName %>"
SelectCommand="SELECT * FROM [Details]"
DeleteCommand = "DELETE FROM [Details] WHERE ID = [@ID]">
<DeleteParameters>
<asp:Parameter Name="ID" />
</DeleteParameters></asp:SqlDataSource>
<asp:Button ID="btnDelete" runat="server" OnClick="btnDelete_Click" OnClientClick="return DeleteConfirmation();" Text="Delete" />
<br />