How do I lock Mysql

Hi,
I'm building a mysql database which is accessed via JDBC. The database can have many users, but I want to simplify it by only allowing one user to connect to the database at a time. My Java application creates and holds onto a connection until it exits. I just need to know how to lock the whole database whilst somebody is connected! Any ideas?
Cheerz,
Steve.

The best solution i've come up with is to change th mysql system variable max_connections to 0 which only allows one person access at a time.
If anybody knows of a better solution then let me know!!

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How do I lock Mysql

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