I am using mysql external to fill a table on a database.

Now I want to retrieve data from it. But I get an error when I try to 

send querys as messages to the Mysql object like:

Does anyone can point me in the right direction for solving this 

I am using mysql external to fill a table on a database.
Now I want to retrieve data from it. But I get an error when I try to  
send querys as messages to the Mysql object like:

Does anyone can point me in the right direction for solving this  
problem?

retrieve data from mysql