錯誤與CFLoop當條目丟失

Question

我有以下代碼。

<cfoutput> 
<cfxml variable="eating"> 
<catalog> 
<results>10</results> 
<food id="bk101"> 
<initials>BK</initials> 
<keywords>Burger King, pie, hamburgers, fries, milkshakes</keywords> 
</food> 
<food id="bk102"> 
<initials>TB</initials> 
<keywords>Taco Bell, tacos, churros, burrito, gorditas</keywords> 
</food> 
<food id="bk103"> 
<keywords>Pizza Hut, pizza, cheese, garlic bread</keywords> 
</food> 
<food id="bk104"> 
<initials>CFA</initials> 
<keywords>Chick-Fil-A, chicken, chicken wrap, sauce, Bananas Pudding Milkshake</keywords> 
</food> 
<food id="bk105"> 
<initials>PE</initials> 
<keywords>Panda Express, rice, egg rolls, general tso</keywords> 
</food> 
<food id="bk106"> 
<initials>SJ</initials> 
<keywords>Sakura Japan, rice, spring rolls, bento</keywords> 
</food> 
<food id="bk107"> 
<keywords>Five Guys, fries, burgers, hot dogs</keywords> 
</food> 
<food id="bk108"> 
<initials>TN</initials> 
<keywords>Tandoori Nights, biryani, chicken, egg rolls</keywords> 
</food> 
<food id="bk109"> 
<initials>HoK</initials> 
<keywords>House of Kabob, rice, bread, beef kabaob, chicken kabob</keywords> 
</food> 
<food id="bk110"> 
<initials>BF</initials> 
<keywords>Baja Fresh, quesadilla, soft taco, chili con queso</keywords> 
</food> 
</catalog> 
</cfxml> 


<cfset data = queryNew("id,initials,keywords","integer,varchar,varchar")> 
<cfloop index="x" from="1" to="#eating.catalog.results.xmlText#"> 
<cfset queryAddRow(data)> 
<cfset querySetCell(data,"id",x)> 
<cfset querySetCell(data,"initials","#eating.catalog.food[x].initials#")> 
<cfset querySetCell(data,"keywords","#eating.catalog.food[x].keywords#")> 
</cfloop> 
</cfoutput> 

<cfoutput query="data"> 
#id# - <b>#initials#</b> #keywords#<br /> 
</cfoutput> 

您會注意到XML Feed中元素3和元素7的初始標記缺失。如果將initials標籤添加到元素3和7的XML中，則代碼運行得非常漂亮。但是，由於它們丟失了，這會導致CFLoop拋出一個錯誤。

我想什麼做的是省略元素3（和所有其他條目引起的誤差）從我的結果，並避免任何錯誤的展示，以便應用結果表明，像這樣

1 - BK漢堡王，餡餅，漢堡包，薯條，奶昔

2 - TB塔可鍾，玉米餅，churros，捲餅，gorditas

4 - CFA福來雞，雞肉，雞肉卷，醬，香蕉布丁奶昔

5 - PE Panda Express，ri CE，蛋卷，一般TSO

6 - SJ櫻日本，水稻，春捲，盒飯

8 - TN唐·夜，布瑞雅尼，雞，蛋卷

9 - Kabob的學樓，米飯，麪包，牛肉kabaob，雞肉kabob

10 - BF Baja Fresh的，油炸玉米餅，玉米餅軟，辣椒CON克索

以上飼料是一個簡單的例子，我實際的飼料有數百個元素。考慮到這一點，我怎麼能省略任何給我一個錯誤的元素，同時還包括那些元素呢？

Answer 1

Mike，我將所有代碼複製到本地腳本中以運行快速測試。我做了一個小的修改您的CFLOOP代碼，正要得到輸出，沒有錯誤（加入條件評估結構，確保重點與structKeyExists存在）：

<cfloop index="x" from="1" to="#eating.catalog.results.xmlText#"> 
    <cfif structKeyExists(eating.catalog.food[x],"initials")> 
     <cfset queryAddRow(data)> 
     <cfset querySetCell(data,"id",x)> 
     <cfset querySetCell(data,"initials", eating.catalog.food[x].initials)> 
     <cfset querySetCell(data,"keywords", eating.catalog.food[x].keywords)> 
    </cfif> 
</cfloop> 

這是我收到的輸出在我的瀏覽器：

1 - BK漢堡王，餡餅，漢堡包，薯條，奶昔

2 - TB塔可鍾，玉米餅，churros，捲餅，gorditas

4 - CFA福來雞，雞肉，雞肉包，醬，香蕉布丁奶昔

5 - PE熊貓明確，稻，蛋卷，一般TSO

6 - SJ櫻日本，水稻，春捲，盒飯

8 - TN唐·夜，布瑞雅尼，雞，蛋卷

9 - kabob，米飯，麪包，牛肉kabaob，雞肉kabob的學樓

10 - BF Baja Fresh的，油炸玉米餅，玉米餅軟，辣椒CON克索