FormView显示、更新、插入、删除数据库操作[ASP.NET源代码](三)

来源：岁月联盟 编辑：exp 时间：2012-05-05
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三、使用 FormView控件更新数据

1、编辑InsertItemTemplate模板，代码如下：

[html] <InsertItemTemplate> 
                <table border="0" cellpadding="0" cellspacing="0" width="420"> 
                    <tr> 
                        <td colspan="6" height="30" width="420" align="center"> 
                        <h4>FormView InsertItemTemplate 模板</h4> 
                        </td> 
                    </tr> 
                    <tr> 
                        <td width="30"> 
                        </td> 
                        <td rowspan="4" width="120"> 
                            <asp:Image ID="imgItem" runat="server" Width="120px" Height="120px" ImageUrl='<%# Eval("Image") %>' 
                                AlternateText="上传浏览图片" /></td> 
                        <td width="30"> 
                        </td> 
                        <td colspan="2"> 
                            <asp:FileUpload ID="fupImage" runat="server" Width="100%"/></td> 
                        <td width="60"> 
                            <asp:Button ID="btnUpload" Text="上传" OnClick="btnUpload_Click" runat="server"></asp:Button></td> 
                    </tr> 
                    <tr> 
                        <td width="30"> 
                        </td> 
                        <td width="30"> 
                        </td> 
                        <td width="60"> 
                            分类：</td> 
                        <td width="120"> 
                            <asp:DropDownList ID="ddlCategory" runat="server" DataSourceID="sdsCategory" DataTextField="Name" 
                                DataValueField="CategoryId"> 
                            </asp:DropDownList></td> 
                        <td width="60"> 
                        </td> 
                    </tr> 
                    <tr> 
                        <td width="30"> 
                        </td> 
                        <td width="30"> 
                        </td> 
                        <td width="60"> 
                            名称：</td> 
                        <td width="120"> 
                            <asp:TextBox ID="txtName" Text='<%# Bind("Name") %>' runat="server" /></td> 
                        <td width="60"> 
                        </td> 
                    </tr> 
                    <tr> 
                        <td width="30"> 
                        </td> 
                        <td width="30"> 
                        </td> 
                        <td width="60"> 
                            价格： 
                        </td> 
                        <td width="120"> 
                            <asp:TextBox ID="txtPrice" Text='<%# Bind("Price") %>' runat="server" /></td> 
                        <td width="60"> 
                        </td> 
                    </tr> 
                    <tr> 
                        <td height="30" width="30"> 
                        </td> 
                        <td height="30" width="120"> 
                        </td> 
                        <td height="30" width="30"> 
                        </td> 
                        <td height="30" width="60"> 
                        </td> 
                        <td height="30" width="120" align="right"> 
                            <asp:Button ID="btnInsert" Text="插入" CommandName="Insert" runat="server" /></td> 
                        <td height="30" width="60"> 
                            <asp:Button ID="btnCancel" Text="取消" CommandName="Cancel" runat="server" /></td> 
                    </tr> 
                </table> 
            </InsertItemTemplate> 
        </asp:FormView> 
        <asp:SqlDataSource ID="sdsItem"  runat="server" ConnectionString="<%$ ConnectionStrings:NetShopConnString %>" 
            SelectCommand="SELECT Item.ItemId AS ItemId,Item.CategoryId AS CategoryId,Item.Name AS Name,Item.Price AS Price,Item.Image AS Image,Category.Name As CategoryName FROM Item INNER JOIN Category ON Item.CategoryId=Category.CategoryId" 
            UpdateCommand="UPDATE Item SET CategoryId=@CategoryId,Name=@Name,Price=@Price,Image=@Image WHERE ItemId=@ItemId" 
            InsertCommand="INSERT INTO Item(CategoryId,Name,Price,Image) VALUES (@CategoryId,@Name,@Price,@Image)"> 
            <UpdateParameters> 
                <asp:Parameter Name="CategoryId" /> 
                <asp:Parameter Name="Name" /> 
                <asp:Parameter Name="Price" /> 
                <asp:Parameter Name="Image" /> 
                <asp:Parameter Name="ItemId" /> 
            </UpdateParameters> 
            <InsertParameters> 
                <asp:Parameter Name="CategoryId" /> 
                <asp:Parameter Name="Name" /> 
                <asp:Parameter Name="Price" /> 
                <asp:Parameter Name="Image" /> 
            </InsertParameters> 
<InsertItemTemplate>
                <table border="0" cellpadding="0" cellspacing="0" width="420">
                    <tr>
                        <td colspan="6" height="30" width="420" align="center">
                        <h4>FormView InsertItemTemplate 模板</h4>
                        </td>
                    </tr>
                    <tr>
                        <td width="30">
                        </td>
                        <td rowspan="4" width="120">
                            <asp:Image ID="imgItem" runat="server" Width="120px" Height="120px" ImageUrl='<%# Eval("Image") %>'
                                AlternateText="上传浏览图片" /></td>
                        <td width="30">
                        </td>
                        <td colspan="2">
                            <asp:FileUpload ID="fupImage" runat="server" Width="100%"/></td>
                        <td width="60">
                            <asp:Button ID="btnUpload" Text="上传" OnClick="btnUpload_Click" runat="server"></asp:Button></td>
                    </tr>
                    <tr>
                        <td width="30">
                        </td>
                        <td width="30">
                        </td>
                        <td width="60">
                            分类：</td>
                        <td width="120">
                            <asp:DropDownList ID="ddlCategory" runat="server" DataSourceID="sdsCategory" DataTextField="Name"
                                DataValueField="CategoryId">
                            </asp:DropDownList></td>
                        <td width="60">
                        </td>
                    </tr>
                    <tr>
                        <td width="30">
                        </td>
                        <td width="30">
                        </td>
                        <td width="60">
                            名称：</td>
                        <td width="120">
                            <asp:TextBox ID="txtName" Text='<%# Bind("Name") %>' runat="server" /></td>
                        <td width="60">
                        </td>
                    </tr>
                    <tr>
                        <td width="30">
                        </td>
                        <td width="30">
                        </td>
                        <td width="60">
                            价格：
                        </td>
                        <td width="120">
                            <asp:TextBox ID="txtPrice" Text='<%# Bind("Price") %>' runat="server" /></td>
                        <td width="60">
                        </td>
                    </tr>
                    <tr>
                        <td height="30" width="30">
                        </td>
                        <td height="30" width="120">
                        </td>
                        <td height="30" width="30">
                        </td>
                        <td height="30" width="60">
                        </td>
                        <td height="30" width="120" align="right">
                            <asp:Button ID="btnInsert" Text="插入" CommandName="Insert" runat="server" /></td>
                        <td height="30" width="60">
                            <asp:Button ID="btnCancel" Text="取消" CommandName="Cancel" runat="server" /></td>
                    </tr>
                </table>
            </InsertItemTemplate>
        </asp:FormView>
        <asp:SqlDataSource ID="sdsItem"  runat="server" ConnectionString="<%$ ConnectionStrings:NetShopConnString %>"
            SelectCommand="SELECT Item.ItemId AS ItemId,Item.CategoryId AS CategoryId,Item.Name AS Name,Item.Price AS Price,Item.Image AS Image,Category.Name As CategoryName FROM Item INNER JOIN Category ON Item.CategoryId=Category.CategoryId"
            UpdateCommand="UPDATE Item SET CategoryId=@CategoryId,Name=@Name,Price=@Price,Image=@Image WHERE ItemId=@ItemId"
            InsertCommand="INSERT INTO Item(CategoryId,Name,Price,Image) VALUES (@CategoryId,@Name,@Price,@Image)">
            <UpdateParameters>
                <asp:Parameter Name="CategoryId" />
                <asp:Parameter Name="Name" />
                <asp:Parameter Name="Price" />
                <asp:Parameter Name="Image" />
                <asp:Parameter Name="ItemId" />
            </UpdateParameters>
            <InsertParameters>
                <asp:Parameter Name="CategoryId" />
                <asp:Parameter Name="Name" />
                <asp:Parameter Name="Price" />
                <asp:Parameter Name="Image" />
            </InsertParameters>

 

2、这个模板和编辑模板基本一样，就是点击“新建”按钮进入时，没有绑定数据而已，因此，“上传”按钮的响应函数可复用，更新前的赋值操作也基本是一样的。

为fvwItem添加响应函数，代码如下：

[csharp] protected void fvwItem_ItemInserting(object sender, FormViewInsertEventArgs e) 
{ 
    DropDownList ddl = (DropDownList)fvwItem.FindControl("ddlCategory"); 
    sdsItem.InsertParameters["CategoryId"].DefaultValue = ddl.SelectedValue; 
 
    Image img = (Image)fvwItem.FindControl("imgItem"); 
    sdsItem.InsertParameters["Image"].DefaultValue = img.ImageUrl; 
} 
 protected void fvwItem_ItemInserting(object sender, FormViewInsertEventArgs e)
 {
     DropDownList ddl = (DropDownList)fvwItem.FindControl("ddlCategory");
     sdsItem.InsertParameters["CategoryId"].DefaultValue = ddl.SelectedValue;

     Image img = (Image)fvwItem.FindControl("imgItem");
     sdsItem.InsertParameters["Image"].DefaultValue = img.ImageUrl;
 }
 

3、别忘了添加fvwItem的InsertCommand命令，并添加参数变量UpdateParameters：

[html] InsertCommand="INSERT INTO Item(CategoryId,Name,Price,Image) VALUES (@CategoryId,@Name,@Price,@Image)" 
InsertCommand="INSERT INTO Item(CategoryId,Name,Price,Image) VALUES (@CategoryId,@Name,@Price,@Image)"

 

[html] <asp:SqlDataSource ID="sdsCategory" runat="server" ConnectionString="<%$ ConnectionStrings:NetShopConnString %>" 
    SelectCommand="SELECT CategoryId,Name FROM Category"> 
</asp:SqlDataSource> 
<asp:SqlDataSource ID="sdsCategory" runat="server" ConnectionString="<%$ ConnectionStrings:NetShopConnString %>"
    SelectCommand="SELECT CategoryId,Name FROM Category">
</asp:SqlDataSource>
 

 

4、在浏览器中查看运行结果。

四、使用 FormView控件删除数据

这个操作不需要参数，所了也就最简单了，只要在sdsItem中添加一个DeleteCommand="DELETE FROM Item WHERE(ItemId=@ItemId)"命令就可以了。

为了在删除数据库中的图片地址的同时，也删除服务器端的图片文件，还是添加了一个消息响应函数，代码如下：

[csharp] protected void fvwItem_ItemDeleting(object sender, FormViewDeleteEventArgs e) 
{ 
    Image img = (Image)fvwItem.FindControl("imgItem"); 
    File.Delete(Server.MapPath(img.ImageUrl)); 
} 
    protected void fvwItem_ItemDeleting(object sender, FormViewDeleteEventArgs e)
    {
        Image img = (Image)fvwItem.FindControl("imgItem");
        File.Delete(Server.MapPath(img.ImageUrl));
    }

 

protected void fvwItem_ItemDeleting(object sender,FormViewDeleteEventArgs e)

{

    Image img = (Image)fvwItem.FindControl("imgItem");

    File.Delete(Server.MapPath(img.ImageUrl));

}

 

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