无限循环-迭代，函数返回true

I've question. I need to make a program running in the background. The program is to collect and save data in my database.

I started to do so:

func main() {
   for {
      doAll()
   }
}

And that retrieves data from all addresses at one time ("go" function):

func doAll() {
   rows, err := MySQL.QueryRow("SELECT * FROM `settings`")
   checkError(err)
   defer rows.Close()
   for rows.Next() {
      c := make(chan bool)

      var http string

      err = rows.Scan(&http )
      checkError(err)

      go doOne(http)
      <- c
   }
}

And that retrieves data from one web site.

func doOne() {
   // some code
   c <- true
}

My question is whether iterations of the "doAll" function will be in order?

Yes the iterations of doAll will be in order, because the c channel is unbuffered. That means in your for rows.Next() loop, the read from c will wait until doOne writes to the channel.

You can make this code simpler by removing the channel and executing doOne synchronously (that is: just call it as a function). The code refactored in this way has exactly the same semantics.