On the offchance that it's useful to anyone else, this will give you a comma-delimited list of the columns in each table:
SELECT table_name,GROUP_CONCAT(column_name ORDER BY ordinal_position)
FROM information_schema.columns
WHERE table_schema = DATABASE()
GROUP BY table_name
ORDER BY table_name
Note : When using tables with a high number of columns and/or with long field names, be aware of the group_concat_max_len limit, which can cause the data to get truncated.