Question

我需要根据以下输入中的类别检索AmountRequired，并列出所有重复的元素。

<root>
    <Unspecified>
        <Category>T03</Category>
        <AmountRequired>993</AmountRequired>
        <ExcessAmount>250</ExcessAmount>
        <Currency>GBP</Currency>
        <ExchangeRate>1</ExchangeRate>
    </Unspecified>
    <Unspecified>
        <Category>T03</Category>
        <AmountRequired>9903</AmountRequired>
        <ExcessAmount>250</ExcessAmount>
        <Currency>GBP</Currency>
        <ExchangeRate>1</ExchangeRate>
    </Unspecified>
    <Unspecified>
        <Category>P02</Category>
        <AmountRequired>992</AmountRequired>
        <Currency>GBP</Currency>
        <ExchangeRate>1</ExchangeRate>
    </Unspecified>
    <Unspecified>
        <Category>A29</Category>
        <AmountRequired>929</AmountRequired>
        <Currency>GBP</Currency>
        <ExchangeRate>1</ExchangeRate>
    </Unspecified>
</root>

我想得到如下的输出。当有T03的2个标签时，它应显示如下的数量。此外，如果一个类别不存在，它不会例如P05，如果我们有它的转换，那么它错误输出P05不存在，所以有没有办法克服错误，即使输入xml没有不包含P05类别？

<amountRequired>
        <amount>929</amount>
        <currency>GBP</currency>
        <exchangeRate>1</exchangeRate>
        <amountInSystemCurrency>550</amountInSystemCurrency>
    </amountRequired>
<amountRequired>
    <amount>993</amount>
    <currency></currency>
    <exchangeRate></exchangeRate>
    <amountInSystemCurrency></amountInSystemCurrency>
</amountRequired>
<amountRequired>
    <amount>9903</amount>
    <currency></currency>
    <exchangeRate></exchangeRate>
    <amountInSystemCurrency></amountInSystemCurrency>
</amountRequired>
<amountRequired>
        <amount>992</amount>
        <currency></currency>
        <exchangeRate></exchangeRate>
        <amountInSystemCurrency></amountInSystemCurrency>
    </amountRequired>

非常感谢您对此的任何帮助

Answer 1

您可以使用以下代码 -

%dw 1.0
%output application/xml
---
using (T03=payload.root.*Unspecified filter ($.Category == 'T03')){
    //http://stackoverflow.com/questions/36598550/mule-dataweave-using-when-and-map
    amountRequired:{  
    amount:T03.AmountRequired[0] default 0,
    currency:"",
    exchangeRate:"",
    amountInSystemCurrency:""
} 
}

它使用变量T03来保存从原始有效负载过滤的T03类别项。当存在时，amount: T03.AmountRequired[0] default 0将从T03输出数量，否则默认为0.

在对此答案的评论中，您似乎已经更改了要求:)。无论如何，编辑这个答案以适应以下评论＆＃34;
我编辑了这个问题，希望它有意义。我想输出所有标签（注意：T03重复并希望输出它们） - Neil24 13分钟前＆＃34;

%dw 1.0
%output application/xml
---
{
    root : { (payload.root.*Unspecified map 
        amountRequired: {
            amount:$.AmountRequired unless $.Category != 'T03' otherwise 0,
            currency:"",
            exchangeRate:"",
            amountInSystemCurrency:""
        }
    )}
}

这是非常直接的转换，除非当前类别为T03，否则金额字段为0。在原始问题中，您提到只有在T03类别时才需要金额，所以除非..否则检查，如果您想要每个类别的金额，只需删除它。

希望有帮助！

Mule Dataweave：使用when和Map

1 个答案: