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main.go
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main.go
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package main
import (
"database/sql"
"database/sql/driver"
"fmt"
"log"
"time"
"github.com/go-sql-driver/mysql"
)
const RFC3339Date = "2006-01-02"
// Date without time zone
type Date struct {
year int
month time.Month
day int
}
func NewDate(year int, month time.Month, day int) *Date {
t := time.Date(year, month, day, 0, 0, 0, 0, time.UTC)
return &Date{
year: t.Year(),
month: t.Month(),
day: t.Day(),
}
}
func (d *Date) Year() int {
return d.year
}
func (d *Date) Month() time.Month {
return d.month
}
func (d *Date) Day() int {
return d.day
}
func (d *Date) Format(layout string) string {
return d.Time(nil).Format(layout)
}
func (d *Date) Time(loc *time.Location) time.Time {
if loc == nil {
loc = time.Local
}
return time.Date(d.year, d.month, d.day, 0, 0, 0, 0, loc)
}
// Go => MySQL
func (d Date) Value() (driver.Value, error) {
return driver.Value(d.Format(RFC3339Date)), nil
}
// MySQL => Go
func (d *Date) Scan(value interface{}) error {
var t mysql.NullTime
err := t.Scan(value)
if err != nil {
return err
}
d.day = t.Time.Day()
d.month = t.Time.Month()
d.year = t.Time.Year()
return nil
}
// interface check
var _ driver.Valuer = (*Date)(nil)
var _ sql.Scanner = (*Date)(nil)
func main() {
locale, err := time.LoadLocation("Asia/Tokyo")
if err != nil {
panic(err)
}
c := mysql.Config{
DBName: "go_tz",
User: "root",
Passwd: "",
Addr: "db:3306",
Net: "tcp",
Collation: "utf8mb4_bin",
ParseTime: true,
Loc: locale,
}
dsn := c.FormatDSN()
db, err := sql.Open("mysql", dsn)
if err != nil {
log.Fatal(err)
}
init := func() {
_, err := db.Exec("drop table if exists test_date")
if err != nil {
log.Fatal(err)
}
_, err = db.Exec("create table test_date(dt date)")
if err != nil {
log.Fatal(err)
}
}
{
init()
date1 := time.Date(2022, 11, 2, 0, 0, 0, 0, time.UTC)
_, err = db.Exec("insert into test_date(dt) values (?)", date1)
if err != nil {
log.Fatal(err)
}
rows, err := db.Query("select dt from test_date")
if err != nil {
log.Fatal(err)
}
var date2 time.Time
for rows.Next() {
rows.Scan(&date2)
break
}
// date1: 2022-11-02(2022-11-02T00:00:00Z), date2: 2022-11-01(2022-11-01T15:00:00Z)
fmt.Printf("date1: %s(%s), date2: %s(%s)\n",
date1.UTC().Format(RFC3339Date),
date1.UTC().Format(time.RFC3339),
date2.UTC().Format(RFC3339Date),
date2.UTC().Format(time.RFC3339),
)
}
{
init()
date1 := NewDate(2022, 11, 2)
_, err = db.Exec("insert into test_date(dt) values (?)", date1)
if err != nil {
log.Fatal(err)
}
rows, err := db.Query("select dt from test_date")
if err != nil {
log.Fatal(err)
}
var date2 Date
for rows.Next() {
rows.Scan(&date2)
break
}
// date1: 2022-11-02, date2: 2022-11-02
fmt.Printf("date1: %s, date2: %s\n",
date1.Format(RFC3339Date),
date2.Format(RFC3339Date),
)
}
}