How to get field in a struct dynamically

I have the below struct. I have the method csv which will return concatenate the fields in a string with comma separated value.

package main
import (
"bytes"
"strconv"
)
type Event struct {
B_id string
B_nam string
B_typ int
B_uuid string
B_mj_id int
B_mi_id int
B_uid string
B_url string
B_mac string
E_typ string
E_time string
C_id string
D_os string
D_os_v string
D_nam string
D_v string
Br_nam string
Br_v string
A_pkg string
A_id string
M_u_id string
bn_id string
}
func (e *Event) Csv() string {
var buffer bytes.Buffer
var comma string = ","
buffer.WriteString(e.B_id)
buffer.WriteString(comma)
buffer.WriteString(e.B_nam)
buffer.WriteString(comma)
buffer.WriteString(strconv.Itoa(e.B_typ))
buffer.WriteString(comma)
buffer.WriteString(e.B_uuid)
buffer.WriteString(comma)
buffer.WriteString(strconv.Itoa(e.B_mj_id))
buffer.WriteString(comma)
buffer.WriteString(strconv.Itoa(e.B_mi_id))
buffer.WriteString(comma)
buffer.WriteString(e.B_uid)
buffer.WriteString(comma)
buffer.WriteString(e.B_url)
buffer.WriteString(comma)
buffer.WriteString(e.B_mac)
buffer.WriteString(comma)
buffer.WriteString(e.E_typ)
buffer.WriteString(comma)
buffer.WriteString(e.E_time)
buffer.WriteString(comma)
buffer.WriteString(e.C_id)
buffer.WriteString(comma)
buffer.WriteString(e.D_os)
buffer.WriteString(comma)
buffer.WriteString(e.D_os_v)
buffer.WriteString(comma)
buffer.WriteString(e.D_nam)
buffer.WriteString(comma)
buffer.WriteString(e.D_v)
buffer.WriteString(comma)
buffer.WriteString(e.Br_nam)
buffer.WriteString(comma)
buffer.WriteString(e.Br_v)
buffer.WriteString(comma)
buffer.WriteString(e.A_pkg)
buffer.WriteString(comma)
buffer.WriteString(e.A_id)
buffer.WriteString(comma)
buffer.WriteString(e.M_u_id)
buffer.WriteString(comma)
buffer.WriteString(e.bn_id)
return buffer.String()
}

Here you can see that I adding each fields in a buffer and returning it as a string. This code does not looks nice.

Is it possible to get the field value dynamically? Something like,

func (e *Event) Csv() string {
var buffer bytes.Buffer
var comma string = ","
var x [22]string fieldValues = //Somehow get the field Values
for i := 0; i < 22; i++ {
buffer.WriteString(B_id)
buffer.WriteString(comma)
}
return buffer.String()
}

Use reflect to iterate the struct fields.

Here is the example:

package main
import (
"fmt"
"reflect"
"strings"
)
type Event struct {
B_id    string
B_nam   string
B_typ   string
B_uuid  string
B_mj_id string
B_mi_id string
B_uid   string
B_url   string
B_mac   string
E_typ   string
E_time  string
C_id    string
D_os    string
D_os_v  string
D_nam   string
D_v     string
Br_nam  string
Br_v    string
A_pkg   string
A_id    string
M_u_id  string
// bn_id   string  //FIXME: unexported fields not work for reflection?
}
func main() {
// initialize your struct, I only take a few of fields as example.
e := Event{A_id: "hah", M_u_id: "dadas"}
v := reflect.ValueOf(e)
values := make([]string, v.NumField())
for i := 0; i < v.NumField(); i++ {
values[i] = v.Field(i).String()
}
fmt.Println(strings.Join(values, ","))
}

May this be helpful.

You can run it online: http://play.golang.org/p/ZheOnMFRnI