如何修改Mule有效负载变量? [英] How do I modify Mule payload variables?

问题描述

使用Mule 3.3，我有一个有效负载(它以JSON开头，并使用java.util.HashMap将其转换为对象).我可以使用以下方法通过JDBC查询访问变量:

Using Mule 3.3, I've got a Payload (which starts out as a JSON and I'm converting it to an Object using java.util.HashMap). I can access the variables just fine from a JDBC query using:

#[message.payload.AddJob.variable1]

我该如何添加新变量(例如variable2)或修改现有变量的值?

How do I go about adding a new variable (say variable2), or modifying the value of an existing variable?

我尝试过:

<message-properties-transformer doc:name="Message Properties">
    <add-message-property key="message.payload.AddJob.variable2" value="&quot;hello&quot;"/>
</message-properties-transformer>

没有效果.

我还尝试了以下建议的常规脚本(如下):

I also tried a groovy Script (below) as suggested here: How to add additional data to a mule payload?, but it overwrites the entire payload with "hello", not just variable2.

payload['AddJob.variable2'] = 'hello'

推荐答案

功能:

<expression-transformer
            expression="#[message.payload.AddJob.variable2='hello';message.payload]" />

?

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