Question about multiple sql databases!

Hello, I have define three sql databases on the sql.conf and each database point to different database but they have the same username and password. Each of them I have added on the /sites-enabled/default instead of the sql. My problem, when I connect to one through the my NAS its connect simultaneously on the 3 databases. Even if the username is doesn't exist on the other 2. Here is my config: sql.conf: sql db1{ } sql db2{ } sql db3{ } default(replace each sql with the following three): db1 db2 db3 I have to create Realms? Or 3 differents virtual servers? Thanks