Question

我最近将json消息解析为结构数组，如下所示：

type Fruit struct {
  Number string
  Type string
}

type Person struct {
  Pid string
  Fruits []Fruit
}

func main() {
  var p Person
  str := `{"pid":"123","fruits":[{"number":"10","type":"apple"},{"number":"50","type":"cherry"}]}`
  json.Unmarshal([]byte(str), &p)

  //loop struct array and insert into database
  stmt, err := tx.Prepare(`insert into empi_credentials(PID, type, num) values(?, ?, ?)`)
  if err != nil {
    panic(err.Error())
  }
  defer stmt.Close()

  for x := range p.Fruits {
    if _, err = stmt4.Exec(string(i), x.Type, x.Number); err != nil {
      log.Println("stmt1.Exec: ", err.Error())
      return
    }
  }
}

当我编译它时，编译器说x.Type和x.Number undefined ...

我该如何解决？

Answer 1

修复错误

undefined: i
x.Type undefined (type int has no field or method Type)
x.Number undefined (type int has no field or method Number)

变化

for x := range p.Fruits

到

for i, x := range p.Fruits

参考：For statements

如何在Go中循环结构切片？

1 个答案: