Question

我正在开发ASP.net 4.0和sql server 2008中的博客，并想学习如何创建一个线程评论系统。通过线程我的意思是每个注释都有一个回复链接，注释在注释下缩进，它是一个回复。因此，您可以回复文章本身或回复任何评论。

这在论坛和博客上非常常见，但我找不到任何可以解释和展示如何完成此操作的代码示例的文章。

以下是我创建的内容，但它仅适用于一个深度级别。我想让它递归，所以深度水平没有限制：我怎样才能做到这一点？任何建议，带有代码示例的文章都会很棒！

评论数据库表

commentId
parentId
postId
date
author
authorEmail
authorURL
authorIP
content
IsApproved

ASP.NET标记：

<asp:ListView ID="ListView1" runat="server" onitemdatabound="ListView1_ItemDataBound">
<ItemTemplate>
    <div class="commentwrap">
        <div class="commentsTitleArea">
            <span class="commentCounter"><%# Convert.ToInt32(Container.DisplayIndex) + 1%>. </span>&nbsp;&nbsp;<img src="../images/decoy-icon-16px.png" alt="Comment by..." title="Comment by..." class="blogCommentIcon" /><a href='<%# Eval("AuthorUrl")%>' target="_blank" rel="nofollow"><%# " " + Eval("Author")%></a>&nbsp;&nbsp;<%# Eval("Date")%></div>
        <div class="commentText">
            <%# Eval("Content") %>
            <div><span class="btnCommentReply"><a href='<%# "article.aspx?article=" + Request.QueryString["article"] + "&amp;cid=" + Eval("commentId") + "#comment" %>'>REPLY</a></span></div>
        </div>
        <asp:ListView ID="ListView2" runat="server">
            <ItemTemplate>
                <div class="commentwrap commentNest">
                    <div class="commentsTitleArea">
                        <span class="commentCounter"><%# Convert.ToInt32(Container.DisplayIndex) + 1%>. </span>&nbsp;&nbsp;<img src="../images/decoy-icon-16px.png" alt="Comment by..." title="Comment by..." class="blogCommentIcon" /><a href='<%# Eval("AuthorUrl")%>' target="_blank" rel="nofollow"><%# " " + Eval("Author")%></a>&nbsp;&nbsp;<%# Eval("Date")%></div>
                    <div class="commentText">
                        <%# Eval("Content") %>
                    </div>
                </div>
            </ItemTemplate>
            <EmptyDataTemplate>
            </EmptyDataTemplate>
            <LayoutTemplate>
                <div id="itemPlaceholderContainer" runat="server">
                    <span id="itemPlaceholder" runat="server" />
                </div>
            </LayoutTemplate>
        </asp:ListView>
    </div>
</ItemTemplate>
<EmptyDataTemplate>
</EmptyDataTemplate>
<LayoutTemplate>
    <div id="itemPlaceholderContainer" runat="server">
        <span id="itemPlaceholder" runat="server" />
    </div>
    <div class="dataPagerWrap">
        <asp:DataPager ID="ListViewpager" runat="server" PagedControlID="ListView1" PageSize="30" QueryStringField="page">
            <Fields>
                <asp:NextPreviousPagerField ShowFirstPageButton="True" ShowNextPageButton="False" ShowPreviousPageButton="False" FirstPageText="«" ButtonCssClass="dataPagerBackForward" />
                <asp:NumericPagerField ButtonCount="8" CurrentPageLabelCssClass="dataPagerCurrent" NumericButtonCssClass="dataPager" PreviousPageText="..." NextPageText="..." NextPreviousButtonCssClass="dataPagerBackForward" />
                <asp:NextPreviousPagerField ShowLastPageButton="True" ShowNextPageButton="False" ShowPreviousPageButton="False" LastPageText="»" ButtonCssClass="dataPagerBackForward" />
            </Fields>
        </asp:DataPager>
    </div>
    <div class="padding"></div>
</LayoutTemplate>

    ALTER PROCEDURE [dbo].[sp_blog_GetComments]
(
    @article int
)
AS
    SET NOCOUNT ON;

    SELECT 
    post_Comments.Author, 
    post_Comments.AuthorEmail, 
    post_Comments.AuthorUrl, 
    post_Comments.Content, 
    post_Comments.Date, 
    post_Comments.commentId 
    FROM post_Comments 
    INNER JOIN 
    posts 
    ON post_Comments.postId = posts.postId 
    WHERE(post_Comments.postId = @article) 
    AND (post_Comments.IsApproved = 1) 
    AND (post_Comments.ParentId IS NULL) 
    AND (posts.IsPublished = 1) 
    AND (posts.PublishOnDate <= GETDATE())

    SELECT 
    Author, 
    AuthorEmail, 
    AuthorUrl, 
    Content, 
    Date, 
    ParentId
    FROM post_Comments
    WHERE (postId = @article) 
    AND (IsApproved = 1)

存储过程：

ALTER PROCEDURE [dbo].[Sp_blog_getcomments] (@article INT)
AS
    SET nocount ON;

    SELECT post_comments.author,
           post_comments.authoremail,
           post_comments.authorurl,
           post_comments.content,
           post_comments.date,
           post_comments.commentid
    FROM   post_comments
           INNER JOIN posts
                   ON post_comments.postid = posts.postid
    WHERE ( post_comments.postid = @article )
          AND ( post_comments.isapproved = 1 )
          AND ( post_comments.parentid IS NULL )
          AND ( posts.ispublished = 1 )
          AND ( posts.publishondate <= Getdate() )

    SELECT author,
           authoremail,
           authorurl,
           content,
           date,
           parentid
    FROM   post_comments
    WHERE  ( postid = @article )
           AND ( isapproved = 1 )

Answer 1

我记得在某个地方看到的一种方法不是使用注释ID和父ID，注释有一个注释ID和一个“排序键”，它是其祖先所有注释ID的串联。

E.g。如果注释1有两个回复，注释2和3，则排序键将是：

1 : 0001
2 : 0001.0002
3 : 0001.0003

然后如果有人回复评论2，那就是......

4 : 0001.0002.0004

因此，如果您选择所有评论并按此排序键排序，它们将按正确的顺序排除。

然后，要进行缩进，只需查看排序键的长度即可查看注释的深度级别，并缩进适当的数量。

添加注释很简单：新注释的排序键只是它的父级排序键，并在末尾添加了自己的ID。

asp.net线程评论？

1 个答案: