使用dataweave循环

时间:2015-10-08 15:43:56

标签: csv mule mule-studio dataweave

我的输入xml:

>>> 45 is greater than 21

我尝试过的数据编辑配置:

  <Root>
     <Element>
         <Record att="a">value</Record>
         <Record att="b">value</Record>
           .
           .
          <Record att="g">value</Record>
          <Record att="h">value</Record>
            .
             .
          <Record att="p">value</Record>
            .
            .
          <Record att="t">value</Record>
              .
              .
          <Record att="w">value</Record>
               .
                .
          <Record att="z">value</Record>
     </Element>
     <Element>
         <Record att="a">value</Record>
         <Record att="b">value</Record>
           .
           .
          <Record att="g">value</Record>
          <Record att="h">value</Record>
            .
             .
          <Record att="p">value</Record>
            .
            .
          <Record att="t">value</Record>
              .
              .
          <Record att="w">value</Record>
               .
                .
          <Record att="z">value</Record>
     </Element>
     .
     .
     .
     .
     .
     .
   </Root>

我的csv o / p:

   %dw 1.0
   %input payload application/xml
   %output application/csv

  ---
  payload.root.*Element[0].*Record map {
    (id:$.@att) when ($.@att) == "g" or ($.@att) == "t", 
    (type:($.@att) when ($.@att) == "g" or ($.@att) == "t"
  }

要求很明确。我只需要元素记录[0]。我的o / p CSV不应该有空行。 预期输出应为:

  id,type (headers)
  blanklines
  .
  .
  .
  g,g
  .
  .
  .
  .
  t,t
  .
  .

我仍然无法理解用于循环的dataweave的语法和概念。请帮帮我。接受任何更好的解决方案。

3 个答案:

答案 0 :(得分:0)

如何访问名称属性(@name),因为它不在您的XML中? 你应该访问'att'属性吗? (@att)

您是否发布了正确的代码和XML?

好的,这应该可以帮到你。

%dw 1.0
%input payload application/xml
%output application/csv 
---
payload.Root.*Element[0].*Record map {
(id:$.@att) ,
(type:$.@att)
} filter ($.id == "g" or $.type == "t")

答案 1 :(得分:0)

如果不使用下标,则引用第一个元素。您可以尝试删除下标[0]

%dw 1.0
%input payload application/xml
%output application/csv 
---
payload.Root.*Element.*Record map {
    (id:$.@att) ,
    (type:$.@att)
} filter 

答案 2 :(得分:-1)

以下代码可以正常使用

Weave Code
%dw 1.0
%output application/csv
---
payload.Root.*Element[0].*Record filter (($.@att == 'g') or ($.@att == 't')) map {
    (id : $.@att),
    (type : $.@att)
} 

输出

id,type
g,g
t,t