Add support to fetch message values using pattern in column tag of JDBCAppender

[gaurav9...@gmail.com]

Hi log4j2 dev,

I have created custom-message implementing 'message' interface.

I have also created JDBCAppender which writes values from above message to
database table.

But how do I get the value from custom message and store it into database?

I've tried pattern attribute in column tag of JDBCAppender but thats not 
working.

Input: custom message
Output: store it into database table

If not, can you add support to fetch message values using pattern in column tag 
of JDBCAppender

Please help,

Thanks,
Gaurav