Pavel Shvedov2014-12-17 15:01:59
Pavel Shvedov, 2014-12-17 15:01:59

Another incomprehensible situation with Go?

Hello everyone, straight to the point. The code:

for _ = range time.Tick(3 * time.Second) {
    fmt.Println("Making query")
    rows, err := db.Query("SELECT id, addr, method FROM tasks")
    defer rows.Close()
    if err != nil {
      fmt.Printf("Database error: %s\n", err.Error())
    } else {
      fmt.Println("Filling queue")
      queue := make(chan *Task)
      for rows.Next() {
        fmt.Println("Get next row")
        var id int32
        var addr string
        var method string
        if err := rows.Scan(&id, &addr, &method); err != nil {
          fmt.Printf("Row error: %s\n", err.Error())
        } else {
          fmt.Printf("Add task for: %s\n", addr)
          queue <- &Task{id, addr, method}
          fmt.Println("Task added")
      fmt.Println("Queue filled")

I read rows from the database, at the first iteration of rows.Next(), the data is normally retrieved, but when I push the result into the channel, everything just gets up at this step.
queue <- &Task{id, addr, method}
What am I doing wrong?

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1 answer(s)
SilentFl, 2014-12-17

As in your previous question - blocking due to an unbuffered channel.

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