Can you explain what a data weave script looks
like?
A DataWeave script is
a text file that contains DataWeave expressions. DataWeave expressions are used
to transform, validate, and enrich data. DataWeave scripts are written in a
declarative style, which means that developers do not need to explicitly code
the entire transformation process. Instead, they simply define the desired
output, and DataWeave intelligently determines the most efficient path to
achieve it.
DataWeave scripts
consist of two main parts:
·
The header: The header contains directives that apply to the body
expression. Directives can be used to specify the input format, the output
format, and other options.
·
The body: The body contains the expression that generates the output. The
expression can be as simple as a single variable or as complex as a nested
expression that includes multiple operations.
Here is an example of
a simple DataWeave script that converts a JSON string to an XML string:
%dw 2.0 output
application/json
---
data as :xml
This script has two
directives:
·
%dw 2.0 output
application/json: This directive specifies that the input is JSON format and
the output is XML format.
·
---: This directive
marks the end of the header and the beginning of the body.
The body of the script
is a single expression: data as :xml. This expression converts the input JSON
data to XML format.
Here is an example of
a more complex DataWeave script that filters an array of objects to only
include objects with a value of "100" in the "amount"
field:
%dw 2.0 output
application/json
---
data filter ($.amount == 100)
This script has the
same two directives as the previous script. The body of the script is a single
expression: data filter ($.amount == 100). This expression filters the input
array of objects to only include objects where the value of the amount property
is equal to 100.
DataWeave scripts can
be used to perform a wide range of data transformation tasks, from simple data
format conversions to intricate data manipulations. They are a powerful and
flexible tool that can be used to streamline data processing tasks and improve
the overall performance of Mule applications.
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