Golang:将time.Time转换为字符串 [英] Golang: convert time.Time to string

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问题描述

我试图将我的数据库中的一些值添加到Go中的 []字符串



我得到错误:


无法使用我可以将 time.Time to string

  type UsersSession struct {
Userid int
时间戳time.Time
Created_date time.Time
}

类型用户struct {
名称字符串
电子邮件字符串
国家字符串
Created_date time.Time
Id int
哈希字符串
IP字符串
}

-

  var usersArray = [] [] string {} 

rows,err:= db.Query(SELECT u.id,u.hash,u.name,u.email,u.country,u.IP,u.created_date, us.timestamp,us.created_date FROM usersSession AS us LEFT JOIN users AS u ON u.id = us.userid WHERE us.timestamp + interval 30 minutes> = now())

U: = Users {}
US:= UsersSe ssion {}

for rows.Next(){
err = rows.Scan(& U.Id,& U.Hash,& U.Name,& U。 Email,& U.Country,& U.IP,& U.Created_date,& US.Timestamp,& US.Created_date)
checkErr(err)

userid_string: = strconv.Itoa(U.Id)
user:= [] string {userid_string,U.Hash,U.Name,U.Email,U.Country,U.IP,U.Created_date,US.Timestamp, US.Created_date}
// -------------
// ^这是发生错误的位置
//不能使用U.Created_date(输入时间.Time)作为数组元素的类型字符串(对于US.Created_date和US.Timestamp也是)
// -------------

usersArray = append (usersArray,user)
log.Print(usersArray:,usersArray)
}

编辑



我添加了以下内容。它现在有效,谢谢。

  userCreatedDate:= U.Created_date.Format(2006-01-02 15:04:05 )
userSessionCreatedDate:= US.Created_date.Format(2006-01-02 15:04:05)
userSessionTimestamp:= US.Timestamp.Format(2006-01-02 15:04 :05)


解决方案

您可以使用 Time.String() 方法转换将 time.Time 更改为字符串。这使用格式字符串2006-01-02 15:04:05.999999999 -0700 MST



如果您需要其他自定义格式,您可以使用 Time.Format() 。例如,要获取 yyyy-MM-dd HH:mm:ss 格式的时间戳,请使用格式字符串2006-01-02 15 :04:05



示例:

  t:= time.Now()
fmt.Println(t.String())
fmt.Println(t.Format(2006-01-02 15:04:05 ))

输出(在 Go Playground ):

  2009-11-10 23 :00:00 +0000 UTC 
2009-11-10 23:00:00

注意:Go游乐场的时间总是设置为上面的值。



另外请注意,使用 Time.Format()作为布局 string 你总是必须经过同一时间 - 称为 reference time-格式化你希望格式化结果的方式。这记录在 Time.Format()
$ b


格式返回一个文本表示根据布局格式化的时间值,通过显示参考时间如何定义格式来定义格式。定义为

  Mon Jan 2 15:04:05 -0700 MST 2006 

会显示,如果它是值;它充当期望输出的一个例子。相同的显示规则将应用于时间值。



I'm trying to add some values from my database to a []string in Go. Some of these are timestamps.

I get the error:

cannot use U.Created_date (type time.Time) as type string in array element

Can I convert time.Time to string?

type UsersSession struct {
    Userid int
    Timestamp time.Time
    Created_date time.Time
}

type Users struct {
    Name string
    Email string
    Country string
    Created_date time.Time
    Id int
    Hash string
    IP string
}

-

var usersArray = [][]string{}

rows, err := db.Query("SELECT u.id, u.hash, u.name, u.email, u.country, u.IP, u.created_date, us.timestamp, us.created_date FROM usersSession AS us LEFT JOIN users AS u ON u.id = us.userid WHERE us.timestamp + interval 30 minute >= now()")

U := Users{}
US := UsersSession{}

for rows.Next() {
    err = rows.Scan(&U.Id, &U.Hash, &U.Name, &U.Email, &U.Country, &U.IP, &U.Created_date, &US.Timestamp, &US.Created_date)
    checkErr(err)

    userid_string := strconv.Itoa(U.Id)
    user := []string{userid_string, U.Hash, U.Name, U.Email, U.Country, U.IP, U.Created_date, US.Timestamp, US.Created_date}
    // -------------
    // ^ this is where the error occurs
    // cannot use U.Created_date (type time.Time) as type string in array element (for US.Created_date and US.Timestamp aswell)
    // -------------

    usersArray = append(usersArray, user)
    log.Print("usersArray: ", usersArray)
}

EDIT

I added the following. It works now, thanks.

userCreatedDate := U.Created_date.Format("2006-01-02 15:04:05")
userSessionCreatedDate := US.Created_date.Format("2006-01-02 15:04:05")
userSessionTimestamp := US.Timestamp.Format("2006-01-02 15:04:05")

解决方案

You can use the Time.String() method to convert a time.Time to a string. This uses the format string "2006-01-02 15:04:05.999999999 -0700 MST".

If you need other custom format, you can use Time.Format(). For example to get the timestamp in the format of yyyy-MM-dd HH:mm:ss use the format string "2006-01-02 15:04:05".

Example:

t := time.Now()
fmt.Println(t.String())
fmt.Println(t.Format("2006-01-02 15:04:05"))

Output (try it on the Go Playground):

2009-11-10 23:00:00 +0000 UTC
2009-11-10 23:00:00

Note: time on the Go Playground is always set to the value seen above. Run it locally to see current date/time.

Also note that using Time.Format(), as the layout string you always have to pass the same time –called the reference time– formatted in a way you want the result to be formatted. This is documented at Time.Format():

Format returns a textual representation of the time value formatted according to layout, which defines the format by showing how the reference time, defined to be

Mon Jan 2 15:04:05 -0700 MST 2006

would be displayed if it were the value; it serves as an example of the desired output. The same display rules will then be applied to the time value.

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