循环遍历 cf9 中的列表

发布于 2024-08-17 19:08:14 字数 266 浏览 4 评论 0原文

开发者指南第 116 页说 “与 cfloop 标签不同，CFScript for-in 循环不提供对查询和列表循环的内置支持。”

问：如何使用 ColdFusion 9 中的新脚本语法循环列表？

<cfloop list="#qry.Columnlist#" index="FieldName">
   <cfset form[FieldName] = qry[FieldName][1]>
</cfloop>

原文

Page 116 of the developer's guide says
"Unlike the cfloop tag, CFScript for-in loops do not provide built-in support for looping over queries and lists."

Q: How do I loop over a list using the new script syntax in ColdFusion 9?

<cfloop list="#qry.Columnlist#" index="FieldName">
   <cfset form[FieldName] = qry[FieldName][1]>
</cfloop>

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×纯※雪 2024-08-24 19:08:14

您还可以尝试 listToArray，然后在 CF9 中对数组使用 for-in 构造，如下所示：

<cfscript>
aCol = listToArray (qry.ColumnList);

for( fieldName in aCol ){
    form[fieldName]  = qry[fieldName][1];
}

</cfscript>

You can also try the listToArray and then use the for-in construct for Arrays in CF9 as:

<cfscript>
aCol = listToArray (qry.ColumnList);

for( fieldName in aCol ){
    form[fieldName]  = qry[fieldName][1];
}

</cfscript>

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近箐 2024-08-24 19:08:14

<cfscript>
  var i = 0;
  var l = ListLen(qry.Columnlist);
  var FieldName = "";
  for (i = 1; i lte l; i = i + 1)  // you also can use i++ instead
  {
    FieldName = ListGetAt(qry.Columnlist, i);
    form[FieldName] = qry[FieldName][1];
  }
</cfscript>

编辑上面的更好的版本（对于非常重的循环，可能甚至更快一点）：

<cfscript>
  var i = 0;
  var Fields = ListToArray(qry.Columnlist);
  var FieldName = "";
  var l = arrayLen(Fields);
  for (i = 1; i lte l; i = i + 1)  // you also can use i++ instead
  {
    FieldName = Fields[i];
    form[FieldName] = qry[FieldName][1];
  }
</cfscript>

<cfscript>
  var i = 0;
  var l = ListLen(qry.Columnlist);
  var FieldName = "";
  for (i = 1; i lte l; i = i + 1)  // you also can use i++ instead
  {
    FieldName = ListGetAt(qry.Columnlist, i);
    form[FieldName] = qry[FieldName][1];
  }
</cfscript>

EDIT Nicer (maybe a even little faster, for really heavy loops) version of the above:

<cfscript>
  var i = 0;
  var Fields = ListToArray(qry.Columnlist);
  var FieldName = "";
  var l = arrayLen(Fields);
  for (i = 1; i lte l; i = i + 1)  // you also can use i++ instead
  {
    FieldName = Fields[i];
    form[FieldName] = qry[FieldName][1];
  }
</cfscript>

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合久必婚 2024-08-24 19:08:14

我首先将列表转换为数组。 ListGetAt() 在循环中调用 n 次效率不高。然而 ArrayLen() 应该相当快。

<cfscript>
arr = ListToArray(qry.Columnlist);

for (i = 1; i <= ArrayLen(arr); i++)
{
    fieldName = arr[i];
    form[FieldName] = qry[FieldName][1];
}
</cfscript>

I would turn the list into an array first. ListGetAt() is not efficient to be called n times in a loop. ArrayLen() however should be quite fast.

<cfscript>
arr = ListToArray(qry.Columnlist);

for (i = 1; i <= ArrayLen(arr); i++)
{
    fieldName = arr[i];
    form[FieldName] = qry[FieldName][1];
}
</cfscript>

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~没有更多了~