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PODELETE statement causing exception in ASP web site
 

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  1. PODELETE statement causing exception in ASP web site
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    <p>Not sure why this is not working and looking for any help. I have an ASP web site that I am building. One page is set up as a Master/Detail page where a GridView is used to show the records within a table. A DetailView with the INSERT, UPDATE AND DELETE STATEMENTS is bound to the SELECT button on my GridView. </p> <p>The INSERT and UPDATE statements work without a problem, however the DELETE statement is throwing an Exception.</p> <p>Here is the code for handling the Exception.</p> <pre><code>protected void DetailsView1_ItemDeleted(object sender, DetailsViewDeletedEventArgs e) { if (e.Exception != null) { lblError.Text = "A database error has occurred.&lt;br /&gt;&lt;br /&gt;" + "Message: " + e.Exception.Message; e.ExceptionHandled = true; } else if (e.AffectedRows == 0) lblError.Text = "Another user may have updated that product." + "&lt;br /&gt;Please try again."; else GridView1.DataBind(); } </code></pre> <p>The Exception thrown is the e.AffectedRows Exception.</p> <p>I am not sure why my table is not accepting the DELETE Statement, any ideas would be appreciated. Here is the code for DetailView</p> <pre><code>&lt;asp:SqlDataSource ID="SqlDataSource2" runat="server" ConflictDetection="CompareAllValues" ConnectionString="&lt;%$ ConnectionStrings:HalloweenConnectionString %&gt;" DeleteCommand="DELETE FROM [Products] WHERE [ProductID] = @original_ProductID AND [Name] = @original_Name AND [ShortDescription] = @original_ShortDescription AND [LongDescription] = @original_LongDescription AND [CategoryID] = @original_CategoryID AND (([ImageFile] = @original_ImageFile) OR ([ImageFile] IS NULL AND @original_ImageFile IS NULL)) AND [UnitPrice] = @original_UnitPrice AND [OnHand] = @original_OnHand" InsertCommand="INSERT INTO [Products] ([ProductID], [Name], [ShortDescription], [LongDescription], [CategoryID], [ImageFile], [UnitPrice], [OnHand]) VALUES (@ProductID, @Name, @ShortDescription, @LongDescription, @CategoryID, @ImageFile, @UnitPrice, @OnHand)" OldValuesParameterFormatString="original_{0}" SelectCommand="SELECT [ProductID], [Name], [ShortDescription], [LongDescription], [CategoryID], [ImageFile], [UnitPrice], [OnHand] FROM [Products] WHERE ([ProductID] = @ProductID)" UpdateCommand="UPDATE [Products] SET [Name] = @Name, [ShortDescription] = @ShortDescription, [LongDescription] = @LongDescription, [CategoryID] = @CategoryID, [ImageFile] = @ImageFile, [UnitPrice] = @UnitPrice, [OnHand] = @OnHand WHERE [ProductID] = @original_ProductID AND [Name] = @original_Name AND [ShortDescription] = @original_ShortDescription AND [LongDescription] = @original_LongDescription AND [CategoryID] = @original_CategoryID AND (([ImageFile] = @original_ImageFile) OR ([ImageFile] IS NULL AND @original_ImageFile IS NULL)) AND [UnitPrice] = @original_UnitPrice AND [OnHand] = @original_OnHand"&gt; &lt;SelectParameters&gt; &lt;asp:ControlParameter ControlID="GridView1" Name="ProductID" PropertyName="SelectedValue" Type="String" /&gt; &lt;/SelectParameters&gt; &lt;DeleteParameters&gt; &lt;asp:Parameter Name="original_ProductID" Type="String" /&gt; &lt;asp:Parameter Name="original_Name" Type="String" /&gt; &lt;asp:Parameter Name="original_ShortDescription" Type="String" /&gt; &lt;asp:Parameter Name="original_LongDescription" Type="String" /&gt; &lt;asp:Parameter Name="original_CategoryID" Type="String" /&gt; &lt;asp:Parameter Name="original_ImageFile" Type="String" /&gt; &lt;asp:Parameter Name="original_UnitPrice" Type="Decimal" /&gt; &lt;asp:Parameter Name="original_OnHand" Type="Int32" /&gt; &lt;/DeleteParameters&gt; &lt;UpdateParameters&gt; &lt;asp:Parameter Name="Name" Type="String" /&gt; &lt;asp:Parameter Name="ShortDescription" Type="String" /&gt; &lt;asp:Parameter Name="LongDescription" Type="String" /&gt; &lt;asp:Parameter Name="CategoryID" Type="String" /&gt; &lt;asp:Parameter Name="ImageFile" Type="String" /&gt; &lt;asp:Parameter Name="UnitPrice" Type="Decimal" /&gt; &lt;asp:Parameter Name="OnHand" Type="Int32" /&gt; &lt;asp:Parameter Name="original_ProductID" Type="String" /&gt; &lt;asp:Parameter Name="original_Name" Type="String" /&gt; &lt;asp:Parameter Name="original_ShortDescription" Type="String" /&gt; &lt;asp:Parameter Name="original_LongDescription" Type="String" /&gt; &lt;asp:Parameter Name="original_CategoryID" Type="String" /&gt; &lt;asp:Parameter Name="original_ImageFile" Type="String" /&gt; &lt;asp:Parameter Name="original_UnitPrice" Type="Decimal" /&gt; &lt;asp:Parameter Name="original_OnHand" Type="Int32" /&gt; &lt;/UpdateParameters&gt; &lt;InsertParameters&gt; &lt;asp:Parameter Name="ProductID" Type="String" /&gt; &lt;asp:Parameter Name="Name" Type="String" /&gt; &lt;asp:Parameter Name="ShortDescription" Type="String" /&gt; &lt;asp:Parameter Name="LongDescription" Type="String" /&gt; &lt;asp:Parameter Name="CategoryID" Type="String" /&gt; &lt;asp:Parameter Name="ImageFile" Type="String" /&gt; &lt;asp:Parameter Name="UnitPrice" Type="Decimal" /&gt; &lt;asp:Parameter Name="OnHand" Type="Int32" /&gt; &lt;/InsertParameters&gt; &lt;/asp:SqlDataSource&gt; </code></pre>
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    1. COcan you rule out a problem with the db first? ie: can you run that delete command via SQL directly?
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      1. USKyle C
    2. COThe actual stack trace would be much more helpful here. But, as Kyle C mentions, verifying the query against your DB is the first step...
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      1. USBrian
    3. COIf ProductID is unique, you can simplify the WHERE clauses in both DELETE and UPDATE.
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      1. USMikeSmithDev
 

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A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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