ESB mule - Data Weaver transformation - mule

Question

I am new to mule esb. I am trying to fetch values from mySQL and transforming to XML. Then hitting service and then result will be stored back in DB table. I have two questions
1) I can see two different way of mapping in ESB mule.
a) Using "Data Mapper"
b) Using "Transform Message" - This will use data Weaver.
Which one of the transformation method will suit for my requirement.
2) I tried using "Transform Message" and Data Weaver for transformation.
My input from DB will fetch three rows as like below.
college = abc college = abc college = abc
dept = IT dept = CSE dept = MECH
No of students = 5 No of students = 4 No of students = 7
Expected output is
<University>
<college>abc</college> <!-- this is simple tag/ It will not repeat -->
<dept> <!-- This is complex tag -->
<dept Name>IT</dept Name>
<No of students>5</No of students>
</dept>
<dept>
<dept Name>IT</dept Name>
<No of students>5</No of students>
</dept>
<dept>
<dept Name>IT</dept Name>
<No of students>5</No of students>
</dept>
I tried data weaver something like below.
%dw 1.0
%output application/xml
"University":{
"college": payload.college,
dept: {
dept_Name: payload."dept_Name",
No of students: payload."No of students"
}
}
But the above dw is not giving expected result. Could you please help me on this ?

Answer 1

You can try this DataWeave, and modify as you need. Hope that helps.
%dw 1.0
%output application/xml
---
{
University: {
college: payload.college[0],
(payload map ((payload01 , indexOfPayload01) -> {
dept: {
deptName: payload01.dept,
Noofstudents: payload01."No of students" as :number
}
}))
}
}