Issue with fetching reports column data

Content

Hi Everyone,

currently i have created one tracked link and sending url in the email to the customers. But now i need to expiry the url after 24hrs 

to implement this i have created one report to store mailing table data and trying to fetch the report data to custom controller.

but it is not allowing to fetch the column data of the report.

Can anyone provide your sugestions on how to fetch the column data of the report in customer portal. It will be very helpful

 Tracked link: https://site interface/cc/file name?cid=$contacts.c_id&ldc=pa&&mailing_id=$mailings.mailing_id