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package csvutil_test
import (
"encoding/csv"
"fmt"
"io"
"log"
"strings"
"github.com/jszwec/csvutil"
)
func ExampleDecoder_Decode() {
type User struct {
ID *int `csv:"id,omitempty"`
Name string `csv:"name"`
City string `csv:"city"`
Age int `csv:"age"`
}
csvReader := csv.NewReader(strings.NewReader(`
id,name,age,city
,alice,25,la
,bob,30,ny`))
dec, err := csvutil.NewDecoder(csvReader)
if err != nil {
log.Fatal(err)
}
var users []User
for {
var u User
if err := dec.Decode(&u); err == io.EOF {
break
} else if err != nil {
log.Fatal(err)
}
users = append(users, u)
}
fmt.Println(users)
// Output:
// [{<nil> alice la 25} {<nil> bob ny 30}]
}
func ExampleDecoder_Decode_slice() {
type User struct {
ID *int `csv:"id,omitempty"`
Name string `csv:"name"`
City string `csv:"city"`
Age int `csv:"age"`
}
csvReader := csv.NewReader(strings.NewReader(`
id,name,age,city
,alice,25,la
,bob,30,ny`))
dec, err := csvutil.NewDecoder(csvReader)
if err != nil {
log.Fatal(err)
}
var users []User
if err := dec.Decode(&users); err != nil {
log.Fatal(err)
}
fmt.Println(users)
// Output:
// [{<nil> alice la 25} {<nil> bob ny 30}]
}
func ExampleDecoder_Decode_array() {
type User struct {
ID *int `csv:"id,omitempty"`
Name string `csv:"name"`
City string `csv:"city"`
Age int `csv:"age"`
}
csvReader := csv.NewReader(strings.NewReader(`
id,name,age,city
,alice,25,la
,bob,30,ny
,john,29,ny`))
dec, err := csvutil.NewDecoder(csvReader)
if err != nil {
log.Fatal(err)
}
var users [2]User
if err := dec.Decode(&users); err != nil {
log.Fatal(err)
}
fmt.Println(users)
// Output:
// [{<nil> alice la 25} {<nil> bob ny 30}]
}
func ExampleDecoder_Unused() {
type User struct {
Name string `csv:"name"`
City string `csv:"city"`
Age int `csv:"age"`
OtherData map[string]string `csv:"-"`
}
csvReader := csv.NewReader(strings.NewReader(`
name,age,city,zip
alice,25,la,90005
bob,30,ny,10005`))
dec, err := csvutil.NewDecoder(csvReader)
if err != nil {
log.Fatal(err)
}
header := dec.Header()
var users []User
for {
u := User{OtherData: make(map[string]string)}
if err := dec.Decode(&u); err == io.EOF {
break
} else if err != nil {
log.Fatal(err)
}
for _, i := range dec.Unused() {
u.OtherData[header[i]] = dec.Record()[i]
}
users = append(users, u)
}
fmt.Println(users)
// Output:
// [{alice la 25 map[zip:90005]} {bob ny 30 map[zip:10005]}]
}
func ExampleDecoder_decodeEmbedded() {
type Address struct {
ID int `csv:"id"` // same field as in User - this one will be empty
City string `csv:"city"`
State string `csv:"state"`
}
type User struct {
Address
ID int `csv:"id"` // same field as in Address - this one wins
Name string `csv:"name"`
Age int `csv:"age"`
}
csvReader := csv.NewReader(strings.NewReader(
"id,name,age,city,state\n" +
"1,alice,25,la,ca\n" +
"2,bob,30,ny,ny"))
dec, err := csvutil.NewDecoder(csvReader)
if err != nil {
log.Fatal(err)
}
var users []User
for {
var u User
if err := dec.Decode(&u); err == io.EOF {
break
} else if err != nil {
log.Fatal(err)
}
users = append(users, u)
}
fmt.Println(users)
// Output:
// [{{0 la ca} 1 alice 25} {{0 ny ny} 2 bob 30}]
}
func ExampleDecoder_Decode_inline() {
type Address struct {
Street string `csv:"street"`
City string `csv:"city"`
}
type User struct {
Name string `csv:"name"`
Address Address `csv:",inline"`
HomeAddress Address `csv:"home_address_,inline"`
WorkAddress Address `csv:"work_address_,inline"`
Age int `csv:"age,omitempty"`
}
data := []byte(
"name,street,city,home_address_street,home_address_city,work_address_street,work_address_city,age\n" +
"John,Washington,Boston,Boylston,Boston,River St,Cambridge,26",
)
var users []User
if err := csvutil.Unmarshal(data, &users); err != nil {
fmt.Println("error:", err)
}
fmt.Println(users)
// Output:
// [{John {Washington Boston} {Boylston Boston} {River St Cambridge} 26}]
}
|
