mysql - 输出所有结果？

Question

我一直在尝试在 ColdFusion 中创建我自己的论坛脚本，但遗憾的是，这比我想象的要困难得多。我在尝试显示数据库中的所有评论时卡住了，因为 ColdFusion 向我抛出错误。

The following information is meant for the website developer for debugging purposes.

Error Occurred While Processing Request

Element USERNAME is undefined in REAGEER.

The error occured in C:/inetpub/wwwroot/content/1-Home/topicview.cfm: line 197

195:
196:         <div id="pers_info">
<strong>197:         <a href="/">#reageer.username#</a> <cfif #reageer.online# is 1><img src="http://www.wonderhotel.nl/archive/icons/mini/habbo_online_anim.gif"></img><cfelse><img src="http://www.wonderhotel.nl/archive/icons/mini/habbo_offline.gif"></img></cfif></strong></strong>
198:         <p>Berichten: 55</p>
199:

我为这个脚本编写的代码如下:

<cfif IsDefined('URL.id') and URL.id neq ""> // Get the topic ID
<cfquery name = "comments" datasource = "#DSN#">
SELECT *
FROM  `forum_comments`
WHERE topicid = #id#
</cfquery> // Get the comments

  <cfif #comments.RecordCount# is 1>

<cfquery name = "reageer" datasource = "#DSN#">
SELECT *
FROM  `users`
WHERE id = #comments.poster#
</cfquery> // Get the comment posters
</cfif>

                        <cfset colour ="post_uneven">

  <cfloop query="comments">

<div id="#colour#">

        <div id="pers_info">
        <a href="/">#reageer.username#</a> <cfif #reageer.online# is 1><img src="http://www.wonderhotel.nl/archive/icons/mini/habbo_online_anim.gif"></img><cfelse><img src="http://www.wonderhotel.nl/archive/icons/mini/habbo_offline.gif"></img></cfif>
        <p>Berichten: 55</p>

<cfquery name = "reageer_badge_one" datasource = "#DSN#">
SELECT *
FROM  `user_badges`
WHERE user_id = '#reageer.id#'
AND badge_slot = 1
</cfquery>
<cfquery name = "reageer_badge_second" datasource = "#DSN#">
SELECT *
FROM  `user_badges`
WHERE user_id = '#reageer.id#'
AND badge_slot = 2
</cfquery>

                <div id="pers_info_habbo">
                <img src="http://habbo.nl/habbo-imaging/avatarimage?figure=#reageer.look#.gif">
                </div>

                        <div id="pers_info_grbadge">
                <cfif #reageer_badge_one.RecordCount# is 1>
                <img src="http://wonderhotel.nl/Public/Images/badges/#reageer_badge_one.badge_id#.gif">
                </cfif>
                </div>

                <div id="pers_info_badge">
                <cfif #reageer_badge_second.RecordCount# is 1>
                <img src="http://wonderhotel.nl/Public/Images/badges/#reageer_badge_second.badge_id#.gif">
                </cfif>
                </div>

                <div id="pers_info_missie">
                #reageer.motto#
                </div>
        </div>


        <div id="post_text">

                <a href="/"><div id="post_text_edit" title="Bericht aanpassen"></div></a>
                <a href="/"><div id="post_text_delete" title="Bericht verwijderen"></div></a>

                <div id="post_text_title">
                RE: #gettopic.title#
                </div>

                <div id="post_text_date">
                #DateFormat(dateAdd("s", comments.timestamp, "01/01/1970"))# #TimeFormat(dateAdd("s", comments.timestamp, "01/01/1970"))#
                </div>

                <div id="post_text_text">
                #comments.text#

                </div>

        </div>
</div></div>


        <cfif colour is "post_uneven"><cfset colour="post_even"><cfelse><cfset colour="post_uneven"></cfif>
                                        </cfloop>

        </cfoutput>




<div id="topic_info_balk"> // Useless
<div id="forum_paginas">
    Bekijk pagina:
    1
    <a href="#">2</a>
    <a href="#">3</a>
    <a href="#">4</a>
    <a href="#">5</a>
    <a href="#">6</a>
    <a href="#">7</a>
    <a href="#">8</a>
    <a href="#">9</a>
    <a href="#">10</a>
    <a href="#">>></a>
</div>

<div id="reageer-topic">

                                <a href="/topic/<cfoutput>#gettopic.id#</cfoutput>/comment">Reageer</a>
                </div>

</div>
</div>

我真的不知道我做错了什么，也不知道为什么 ColdFusion 给我这个错误。我将不胜感激所有的帮助!我唯一的猜测是 ColdFusion 试图(再次)从第一条评论的发帖人那里获取所有数据，但这是错误的，因为我想获取评论 1、评论 2，以及之后的评论 3、4、5 等等。

此外，在向主题添加第一条评论时，一切正常。但是在添加第二个之后，我得到了您在上面看到的错误。

问候，亚尼克

Answer 1

我的猜测是因为你有一个 <cfif>在“reageer”查询周围，发生错误是因为有超过 1 个评论，但 username 的输出未包裹在 <cfif> 中以及。因此，ColdFusion 试图获取 username 的值。来自不存在的查询(因为 <cfif> 阻止它执行)，因此出现错误。