I wish there were some examples- why is this better than "net/http" + Gorilla? Why the focus on postgres? They talk about using a postgres driver that conforms

I wish there were some examples- why is this better than "net/http" + Gorilla? Why the focus on postgres? They talk about using a postgres driver that conforms to "database/sql". But that should mean you could use a mysql "database/sql" compatible driver like the one provided by mymysql (https://github.com/ziutek/mymysql https://github.com/ziutek/mymysql), with no code changes to your project...