我正在尝试制作一个具有乐观并发的简单 ListView。它使用 VS 自动生成的 Delete、Insert、Update 语句(除了 1 处更改为插入:见代码)。插入和编辑工作正常并提交到数据库。尝试删除时,出现此错误:
您已指定您的删除命令比较 SqlDataSource 'MySourceHere' 上的所有值,但传入值的字典为空。传入有效字典以删除或将模式更改为 OverwriteChanges。
我尝试将“CompareAllValues”更改为“OverwriteChanges”以推迟并发工作,但这会“中断”更新和删除命令,这似乎只是用旧值刷新 ListView。我能找到解决此问题的唯一线程涉及更改为“OverwriteChanges”,或者是没有声明“DataKeyNames”的人。相关标记如下(我希望)。
有什么想法吗?
<asp:SqlDataSource ID="ManageUsersSource" runat="server"
ConflictDetection="CompareAllValues"
ConnectionString="<%$ ConnectionStrings:ConnectionString %>"
DeleteCommand="DELETE FROM [DUSER] WHERE [userid] = ? AND (([username] = ?) OR ([username] IS NULL AND ? IS NULL)) AND (([userpass] = ?) OR ([userpass] IS NULL AND ? IS NULL))"
InsertCommand="INSERT INTO [DUSER] ([username], [userpass]) VALUES (?, ?)"
OldValuesParameterFormatString="original_{0}"
ProviderName="<%$ ConnectionStrings:ConnectionString.ProviderName %>"
SelectCommand="SELECT * FROM [DUSER] ORDER BY [userid] ASC"
UpdateCommand="UPDATE [DUSER] SET [username] = ?, [userpass] = ? WHERE [userid] = ? AND (([username] = ?) OR ([username] IS NULL AND ? IS NULL)) AND (([userpass] = ?) OR ([userpass] IS NULL AND ? IS NULL))">
<DeleteParameters>
<asp:Parameter Name="original_userid" Type="Int16" />
<asp:Parameter Name="original_username" Type="String" />
<asp:Parameter Name="original_username" Type="String" />
<asp:Parameter Name="original_userpass" Type="String" />
<asp:Parameter Name="original_userpass" Type="String" />
</DeleteParameters>
<InsertParameters>
<%--This is removed since [userid] is an automatically generated index.--%>
<%--<asp:Parameter Name="userid" Type="Int16" />--%>
<asp:Parameter Name="username" Type="String" />
<asp:Parameter Name="userpass" Type="String" />
</InsertParameters>
<UpdateParameters>
<asp:Parameter Name="username" Type="String" />
<asp:Parameter Name="userpass" Type="String" />
<asp:Parameter Name="original_userid" Type="Int16" />
<asp:Parameter Name="original_username" Type="String" />
<asp:Parameter Name="original_username" Type="String" />
<asp:Parameter Name="original_userpass" Type="String" />
<asp:Parameter Name="original_userpass" Type="String" />
</UpdateParameters>
</asp:SqlDataSource>
<asp:ListView ID="ListView1" runat="server" DataKeyNames="userid"
DataSourceID="ManageUsersSource" InsertItemPosition="LastItem">
<AlternatingItemTemplate>
<tr style="background-color:#FFF8DC;">
<td>
<asp:Button ID="DeleteButton" runat="server" CommandName="Delete"
Text="Delete" />
<asp:Button ID="EditButton" runat="server" CommandName="Edit" Text="Edit" />
</td>
<td>
<asp:Label ID="useridLabel" runat="server" Text='<%# Eval("userid") %>' />
</td>
<td>
<asp:Label ID="usernameLabel" runat="server" Text='<%# Eval("username") %>' />
</td>
<td>
<asp:Label ID="userpassLabel" runat="server" Text='<%# Eval("userpass") %>' />
</td>
</tr>
</AlternatingItemTemplate>
<EditItemTemplate>
<tr style="background-color:#008A8C;color: #FFFFFF;">
<td>
<asp:Button ID="UpdateButton" runat="server" CommandName="Update"
Text="Update" />
<asp:Button ID="CancelButton" runat="server" CommandName="Cancel"
Text="Cancel" />
</td>
<td>
<asp:Label ID="useridLabel1" runat="server" Text='<%# Eval("userid") %>' />
</td>
<td>
<asp:TextBox ID="usernameTextBox" runat="server"
Text='<%# Bind("username") %>' />
</td>
<td>
<asp:TextBox ID="userpassTextBox" runat="server"
Text='<%# Bind("userpass") %>' />
</td>
</tr>
</EditItemTemplate>
<EmptyDataTemplate>
<table runat="server"
style="background-color: #FFFFFF;border-collapse: collapse;border-color: #999999;border-style:none;border-width:1px;">
<tr>
<td>
No data was returned.</td>
</tr>
</table>
</EmptyDataTemplate>
<InsertItemTemplate>
<tr style="">
<td>
<asp:Button ID="InsertButton" runat="server" CommandName="Insert"
Text="Insert" />
<asp:Button ID="CancelButton" runat="server" CommandName="Cancel"
Text="Clear" />
</td>
<td>
</td>
<td>
<asp:TextBox ID="usernameTextBox" runat="server"
Text='<%# Bind("username") %>' />
</td>
<td>
<asp:TextBox ID="userpassTextBox" runat="server"
Text='<%# Bind("userpass") %>' />
</td>
</tr>
</InsertItemTemplate>
<ItemTemplate>
<tr style="background-color:#DCDCDC;color: #000000;">
<td>
<asp:Button ID="DeleteButton" runat="server" CommandName="Delete"
Text="Delete" />
<asp:Button ID="EditButton" runat="server" CommandName="Edit" Text="Edit" />
</td>
<td>
<asp:Label ID="useridLabel" runat="server" Text='<%# Eval("userid") %>' />
</td>
<td>
<asp:Label ID="usernameLabel" runat="server" Text='<%# Eval("username") %>' />
</td>
<td>
<asp:Label ID="userpassLabel" runat="server" Text='<%# Eval("userpass") %>' />
</td>
</tr>
</ItemTemplate>
<LayoutTemplate>
<table runat="server">
<tr runat="server">
<td runat="server">
<table ID="itemPlaceholderContainer" runat="server" border="1"
style="background-color: #FFFFFF;border-collapse: collapse;border-color: #999999;border-style:none;border-width:1px;font-family: Verdana, Arial, Helvetica, sans-serif;">
<tr runat="server" style="background-color:#DCDCDC;color: #000000;">
<th runat="server">
</th>
<th runat="server">
userid</th>
<th runat="server">
username</th>
<th runat="server">
userpass</th>
</tr>
<tr ID="itemPlaceholder" runat="server">
</tr>
</table>
</td>
</tr>
<tr runat="server">
<td runat="server"
style="text-align: center;background-color: #CCCCCC;font-family: Verdana, Arial, Helvetica, sans-serif;color: #000000;">
<asp:DataPager ID="DataPager1" runat="server">
<Fields>
<asp:NextPreviousPagerField ButtonType="Button" ShowFirstPageButton="True"
ShowLastPageButton="True" />
</Fields>
</asp:DataPager>
</td>
</tr>
</table>
</LayoutTemplate>
<SelectedItemTemplate>
<tr style="background-color:#008A8C;font-weight: bold;color: #FFFFFF;">
<td>
<asp:Button ID="DeleteButton" runat="server" CommandName="Delete"
Text="Delete" />
<asp:Button ID="EditButton" runat="server" CommandName="Edit" Text="Edit" />
</td>
<td>
<asp:Label ID="useridLabel" runat="server" Text='<%# Eval("userid") %>' />
</td>
<td>
<asp:Label ID="usernameLabel" runat="server" Text='<%# Eval("username") %>' />
</td>
<td>
<asp:Label ID="userpassLabel" runat="server" Text='<%# Eval("userpass") %>' />
</td>
</tr>
</SelectedItemTemplate>
</asp:ListView>