[Rails] Storing Postgres data in a variable

I'm learning how to work with Postgres databases.

I've figured out how to get the script at http://marcclifton.wordpress.com/2012/11/12/an-example-of-using-postgresql-with-ruby/ to run properly.  I learned from this script how to enter data into a database table (addUser function) and how to print data from a database table on the screen (queryUserTable function).

What I'm trying to do now is store data from a database table in a variable (like an array of strings).  For this particular example, how would you go about doing this?

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