Hello, I'm one of maintainer of go-sql-driver/mysql.

When there is only one result set, you don't need NextResultSet().
See this example.

https://play.golang.org/p/rhm4Xp6WejB

Then, when you have multi result set, you need to call NextResultSet() once 
to get 2nd result set.
See this example.

https://play.golang.org/p/C-le-V7NWBx

After reading Lutz's sample code.  I found lib/pq has different semantics.
I'm not sure which is the right semantics, intended by database/sql APIs.

Regards,

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