Before Mysql version 5.1.6, you can only log to files what mysqld was doing. 5.1.6 comes with an option where it let's you keep this log in a table called mysql.general_log. Even further, version 5.1.12 came with a new ability to let you disable general query logging on the fly.
You can enable/disable mysql general query logging by setting global variable "general_log".For example following command, starts general logging on the fly.
SET GLOBAL general_log = 'ON';
You have to options, either you can log the queries on in a file where it was the only option before version 5.1.6 , or you can log in the table I mentioned above called mysql.general_log by using global variable "log_output".
The following statement tells mysql to log queries in table mysql.general_log instead of a file.
set global log_output='table';
In any time, you can truncate the table to delete it's contents.
After logging the queries, you can see them by simply using a select statement.
select * from mysql.general_log;
to make it more readable you can use \G at the end of the query.
select * from mysql.general_log\G;