数据编织器循环和检查使用 ESB 骡子无效

Question

我尝试通过检查变量的空值并在结果中设置来实现一个简单的循环。

我的 mule flow 部分如下所示。

数据库(select) -> 转换消息(DataWeave- convert to xml)

数据库的值如下：

Book1 Book2 Book3 Book4 Book5
abc   cde   fgh   ijk   lmn
opq   rst   NULL  NULL  NULL

Dataweaver 代码如下所示：

ns0#LibraryDetails:{
                ns0#User: payload."Book1",
                ns0#User: payload."Book2",
                ns0#User: payload."Book3",
                ns0#User: payload."Book4",
                ns0#User: payload."Book5"
            }

预期输出 1 是

<LibraryDetails>
   <User>abc</User>
   <User>cde</User>
   <User>fgh</User>
   <User>ijk</User>
   <User>lmn</User>
</LibraryDetails>

预期输出 2 是

<LibraryDetails>
   <User>opq</User>
   <User>rst</User>
</LibraryDetails>

我们如何才能只转义空值并在数据编织中创建循环。我也尝试了地图功能。能否请您说明一下。

Answer 1

你可以试试这个：

ns0#LibraryDetails:{
                ns0#User: when null != payload."Book1" then payload."Book1" ,
                ns0#User: when null != payload."Book2"then payload."Book2",
                ns0#User: when null != payload."Book3"then payload."Book3",
                ns0#User: when null != payload."Book4"then payload."Book4",
                ns0#User: when null != payload."Book5"then payload."Book5"
            }

其他：使用以下语句： %output application/xml skipNullOn="everywhere"

Answer 2

要获得预期的输出，请使用 map，如果您希望所有元素都具有该逻辑，则使用 skipNullOn="everywhere"。以下给出了您的预期输出

%dw 1.0
    %output application/xml skipNullOn="everywhere"

    %namespace ns0 http://something.com
    ---

    ns0#LibraryDetails: { (payload map {
          ns0#User: $.Book1,
          ns0#User: $.Book2,
          ns0#User: $.Book3,
          ns0#User: $.Book4,
          ns0#User: $.Book5
    } )  }

数据编织器循环和检查使用 ESB 骡子无效

Data weaver looping and checking nullify using ESB mule

esb

mule

anypoint-studio

dataweave