使用GORM和Postgresql时如何在Go中节省数据库时间? [英] How to save time in the database in Go when using GORM and Postgresql?

问题描述

我当前正在解析时间字符串并将其保存到数据库(PostgreSQL)中:

I'm currently parsing a time string and saving it to the db (Postgresql):

event.Time, _ := time.Parse("3:04 PM", "9:00 PM")
// value of event.Time now is: 0000-01-01 21:00:00 +0000 UTC
db.Create(&event)

这给了我这个错误: pq:R:"DateTimeParseError" S:"ERROR" C:"22008" M:日期/时间字段值超出范围:\" 0000-01-01T21:00:00Z \" F:"datetime.c" L:"3540"

event.Time的类型为 time.Time .

我还尝试将 event.Time 的类型设置为字符串，并在postgresql中使用时间数据类型:

I also tried setting event.Time's type to string and using time data type in postgresql:

type Event struct {
  Time string `gorm:"type:time
}

但是现在在获取数据库中的记录时出现错误:

But now I'm getting an error when fetching records in the db:

sql: Scan error on column index 4: unsupported driver -> Scan pair: time.Time -> *string

推荐答案

进一步研究了此问题.目前，GORM中不支持任何日期/时间类型，但带有时区的 timestamp

Investigated this issue further. Currently, there's no support in GORM for any Date/Time types except timestamp with time zone

请参见 dialect_postgres.go 的这部分代码:

case reflect.Struct:
   if _, ok := dataValue.Interface().(time.Time); ok {
      sqlType = "timestamp with time zone"
}

所以基本上我可以为您提供两个选择:

So basically I see two options for you:

在DB中使用 varchar(10)，在Go中使用 string ，只需将其另存为"9:00 PM"(其中10是一些合适的数字即可)您)

Either use varchar(10) in DB, and string in Go, an simply save it as "9:00 PM" (where 10 is some number that suits you)

或者在DB中使用带有时区的 timestamp ，在Go中使用 time.Time ，并将日期部分格式化为恒定日期，例如01/01/1970.:

Or use timestamp with time zone in DB, time.Time in Go, and format your date part as a constant date, 01/01/1970, for example:

time.Parse("2006-01-02 3:04PM", "1970-01-01 9:00PM")

在这种情况下，您必须在演示文稿中省略日期部分，但是如果您打算按日期范围进行选择，那可能会更好.

In that case you'll have to omit the date part in your presentation, but if you plan to select by date range, that could work better for you.

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