Newbie question, "declared not used"

Getting Help
1

So I’ve been following the nice link on using go on Heroku.
I have to ask,since I’m kind of afraid I’m just stupid or perhaps need a lot more coffee:

Does that actually work? All I get is:

remote: cmd/go-getting-started/main.go:60: db declared and not used
remote: godep: go exit status 2
remote:
remote: ! Push rejected, failed to compile Go app
remote:

Now… some more coffee and “GoBootcamp.Pdf”

2

It means you declare the variable “db” (at line 60), and you don’t use it.
It’s an error in Go.

Can you show your code?

1 Like
3

Hi and thanks. Yes that’s what i thought but as far as I can see I’ve been following their code in that link.
I declare the “db” in func main() and use it in dbFunc() ??

4

In their code:

db is declared here:

var (
    repeat int
    db     *sql.DB = nil
)

It is assigned here:

db, errd = sql.Open("postgres", os.Getenv("DATABASE_URL"))

Note, they use = and not :=

It is use here (in dbFunc()):

if _, err := db.Exec("CREATE TABLE IF NOT EXISTS ticks (tick timestamp)"); err != nil
5

Aaah, of course… sloppiness as usual, thank you for pointing that out to me. So I was kind of stupid after all :wink:

6

Well, that’s a very common mistake, so you are not stupid :), you are just learning…

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7

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