Nullable time.Time

Question

I have a struct that I intend to populate with a database record, one of the datetime columns is nullable:

type Reminder struct {
    Id         int
    Crea         


        

Answer 1

Might also want to check the go-sql-driver implementation, which is basically the same thing as recommended above. https://godoc.org/github.com/go-sql-driver/mysql#NullTime

Answer 2

I like the NullTime example from lib/pq. I tweaked it this way so the NullTime can be treated like a Time...

type NullTime struct {
    time.Time
    Valid bool
}

Answer 3

You can use pq.NullTime, or with Go 1.13, you can now use the standard library's sql.NullTime type.

From lib/pq on github:

type NullTime struct {
    Time  time.Time
    Valid bool // Valid is true if Time is not NULL
}

// Scan implements the Scanner interface.
func (nt *NullTime) Scan(value interface{}) error {
    nt.Time, nt.Valid = value.(time.Time)
    return nil
}

// Value implements the driver Valuer interface.
func (nt NullTime) Value() (driver.Value, error) {
    if !nt.Valid {
        return nil, nil
    }
    return nt.Time, nil
}

Answer 4

mysql.NullTime is depricated https://github.com/go-sql-driver/mysql/issues/960 database/sql will have a NullTime type from Go1.13 onward, which should be used instead https://github.com/golang/go/issues/30305