How to use data weave
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This document discusses how to use DataWeave in Mule applications to transform data. It provides an example Mule flow that uses a DataWeave transform to take an XML file with address data and output a JSON response containing the address fields. The flow uses a DataWeave script within the transform to map the XML fields to JSON properties.
![.mflow
• <?xml version="1.0" encoding="UTF-8"?>
• <mule xmlns:metadata="http://www.mulesoft.org/schema/mule/metadata" xmlns:dw="http://www.mulesoft.org/schema/mule/ee/dw"
xmlns:file="http://www.mulesoft.org/schema/mule/file" xmlns="http://www.mulesoft.org/schema/mule/core" xmlns:doc="http://www.mulesoft.org/schema/mule/documentation"
• xmlns:spring="http://www.springframework.org/schema/beans"
• xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
• xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-current.xsd
• http://www.mulesoft.org/schema/mule/core http://www.mulesoft.org/schema/mule/core/current/mule.xsd
• http://www.mulesoft.org/schema/mule/file http://www.mulesoft.org/schema/mule/file/current/mule-file.xsd
• http://www.mulesoft.org/schema/mule/ee/dw http://www.mulesoft.org/schema/mule/ee/dw/current/dw.xsd">
• <flow name="dataweaveFlow">
• <file:inbound-endpoint path="D:csvcontact" responseTimeout="10000" doc:name="File"/>
• <logger message="flow started" level="INFO" doc:name="Logger"/>
• <dw:transform-message metadata:id="5e76ab87-23c8-4c36-9618-6620c53520f8" doc:name="Transform Message">
• <dw:set-payload><![CDATA[%dw 1.0
• %output application/json
• ---
• {
•
•
• Address: {
•
•
•
• Country: payload.Address.Country,
•
•
• State: payload.Address.State
• ,
•
• City: payload.Address.City
• }
• }]]></dw:set-payload>
• </dw:transform-message>
• <logger message="--Output--#[message.payloadAs(java.lang.String)]--" level="INFO" doc:name="Logger"/>
• </flow>
• </mule>](https://image.slidesharecdn.com/howtousedataweave-160514075156/85/How-to-use-data-weave-5-320.jpg)
![• Output:
• INFO 2016-05-06 12:38:07,038
[[dataweave].connector.file.mule.default.receiver.01]
org.mule.transport.file.FileMessageReceiver: Lock obtained on file:
D:csvcontactsample.xml
• INFO 2016-05-06 12:38:07,038 [[dataweave].dataweaveFlow.stage1.05]
org.mule.api.processor.LoggerMessageProcessor: flow started
• INFO 2016-05-06 12:38:07,038 [[dataweave].dataweaveFlow.stage1.05]
org.mule.api.processor.LoggerMessageProcessor: --Output--{
• "Address": {
• "Country": "India",
• "State": "AP",
• "City": "Dharmavaram"
• }
• }--
•
•
•](https://image.slidesharecdn.com/howtousedataweave-160514075156/85/How-to-use-data-weave-6-320.jpg)
How to use data weave
- 1. How to use DataWeave component 14-05-2015
- 2. Abstract • The main motto of this PPT is How to use DataWeave in our applications.
- 3. Introduction • The DataWeave language is a simple, powerful tool to query and transform data inside of Mule.
- 4. Example
- 5. .mflow • <?xml version="1.0" encoding="UTF-8"?> • <mule xmlns:metadata="http://www.mulesoft.org/schema/mule/metadata" xmlns:dw="http://www.mulesoft.org/schema/mule/ee/dw" xmlns:file="http://www.mulesoft.org/schema/mule/file" xmlns="http://www.mulesoft.org/schema/mule/core" xmlns:doc="http://www.mulesoft.org/schema/mule/documentation" • xmlns:spring="http://www.springframework.org/schema/beans" • xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" • xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-current.xsd • http://www.mulesoft.org/schema/mule/core http://www.mulesoft.org/schema/mule/core/current/mule.xsd • http://www.mulesoft.org/schema/mule/file http://www.mulesoft.org/schema/mule/file/current/mule-file.xsd • http://www.mulesoft.org/schema/mule/ee/dw http://www.mulesoft.org/schema/mule/ee/dw/current/dw.xsd"> • <flow name="dataweaveFlow"> • <file:inbound-endpoint path="D:csvcontact" responseTimeout="10000" doc:name="File"/> • <logger message="flow started" level="INFO" doc:name="Logger"/> • <dw:transform-message metadata:id="5e76ab87-23c8-4c36-9618-6620c53520f8" doc:name="Transform Message"> • <dw:set-payload><![CDATA[%dw 1.0 • %output application/json • --- • { • • • Address: { • • • • Country: payload.Address.Country, • • • State: payload.Address.State • , • • City: payload.Address.City • } • }]]></dw:set-payload> • </dw:transform-message> • <logger message="--Output--#[message.payloadAs(java.lang.String)]--" level="INFO" doc:name="Logger"/> • </flow> • </mule>
- 6. • Output: • INFO 2016-05-06 12:38:07,038 [[dataweave].connector.file.mule.default.receiver.01] org.mule.transport.file.FileMessageReceiver: Lock obtained on file: D:csvcontactsample.xml • INFO 2016-05-06 12:38:07,038 [[dataweave].dataweaveFlow.stage1.05] org.mule.api.processor.LoggerMessageProcessor: flow started • INFO 2016-05-06 12:38:07,038 [[dataweave].dataweaveFlow.stage1.05] org.mule.api.processor.LoggerMessageProcessor: --Output--{ • "Address": { • "Country": "India", • "State": "AP", • "City": "Dharmavaram" • } • }-- • • •
- 7. • Flow of execution: 1. The above flow is used to convert xml to JSON using DataWeave 2. It will pick the .xml file from specific location and will convert and display json response in console 3. Sample xml: <Address> <Country>India</Country> <State>AP</State> <City>Dharmavaram</City> </Address>