使用Mule DataMapper将视图数据平展为JSON [英] Unflattening view data to JSON with Mule DataMapper

问题描述

我有一个数据库视图，需要将其发送到JSON格式的Web API调用，但是我很难确定如何获取数据映射器以将数据展平。我想获取的格式如下：

I've got a database view that I need to send to a Web API call in JSON format, but I'm having a hard time figuring out how to get the datamapper to un-flatten the data. The format I want to get to is something like:

{
    "PersonId": "12345"
  , "CommonProp": "asdf"
  , "DataForPerson": [
        { "Prop1": "prop 1 value A", "Prop2": "prop 2 value A" }
      , { "Prop1": "prop 1 value B", "Prop2": "prop 2 value B" }
    ]
}

视图中出现的格式如下：

The format coming in from the view is something like:

PersonId    CommonProp    Prop1             Prop2
12345       asdf          prop 1 value A    prop 2 value A
12345       asdf          prop 2 value B    prop 2 value B

我该怎么做？我最接近的是

How can I go about doing this? The closest I've gotten is

{
    "PersonId": "12345"
  , "CommonProp": "asdf"
  , "DataForPerson": [
        { "Prop1": "prop 1 value A", "Prop2": "prop 2 value A" }
    ]
} {
    "PersonId": "12345"
  , "CommonProp": "asdf"
  , "DataForPerson": [
        { "Prop1": "prop 1 value B", "Prop2": "prop 2 value B" }
    ]
}

<显然，这是不正确的。我曾尝试使用datamapper做到这一点，但没有任何运气。

Obviously, this is not correct. I'd tried to use the datamapper to do this, but didn't have any luck.

谢谢！

edit 这是流程的图片：

edit Here's a picture of the flow:

民意调查和JDBC是从MY_VIEW中选择不同的人名。在for每个应用程序中，我希望每个人进行一次JSON调用。我现在正在输出到文件，而不是调用Web API，尽管我确实尝试了Web API调用，但只要获得有效的JSON，它就可以正常工作。

The poll and the JDBC are a SELECT DISTINCT PERSON_ID FROM MY_VIEW. In the for each, I was hoping to make one JSON call per person. I'm outputting to a file right now instead of invoking the Web API, though I did try the Web API call, and it works fine so long as it gets valid JSON.

推荐答案

我确实意识到您已要求DataMapper解决方案。如果需要替代解决方案，则以下仅使用MEL：

I do realize that you've asked for a DataMapper solution. In case you want an alternate solution, the following uses MEL only:

<expression-component><![CDATA[
    payload =
      [
        'PersonId': payload[0].PersonId,
        'CommonProp': payload[0].CommonProp,
        'DataForPerson': (['Prop1': $.Prop1, 'Prop2': $.Prop2] in payload)
      ];
]]></expression-component>

<json:object-to-json-transformer />

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