You cannot query this information directly from MySQL, but you can enable the general query log and analyze that it includes connection information and logs requests made by these connections.
. :
http://dev.mysql.com/doc/refman/5.1/en/query-log.html
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100215 16:16:09 2 Connect root@localhost on
2 Query select @@version_comment limit 1
100215 16:18:54 2 Query select "Hello, StackOverflow"
100215 16:19:48 2 Query select * from table
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