<p>Is there any type similar to sql.NullString for time.Time? I'm scanning SQLite query results that contain null values in a timestamp column.</p>
<p>Thank you!</p>
<hr/>**评论：**<br/><br/>kocekoga: <pre><p>There is implementation of this in lib/pg but you can copy it to your project if you want:</p>
<pre><code>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
}
</code></pre></pre>iltempo: <pre><p>Great. This is exactly what I was looking for. I'm wondering why it did not make it into the standard lib.</p></pre>carbocation: <pre><p>It's a good pattern to learn because you can use this pattern for any type, including your own custom types.</p></pre>HectorJ: <pre><p>The MySQL driver has a NullTime type : <a href="https://godoc.org/github.com/go-sql-driver/mysql#NullTime" rel="nofollow">https://godoc.org/github.com/go-sql-driver/mysql#NullTime</a></p>
<p>I'm not sure if that is compatible with SQLite date-times, but worst case you can see the implementation <a href="https://github.com/go-sql-driver/mysql/blob/master/utils.go#L447" rel="nofollow">here</a> and make your own for SQLite</p></pre>iltempo: <pre><p>Thanks. This is exactly the same implementation as on lib/pg. Took it over.</p></pre>bo-banane: <pre><p>No idea whether that'd work, but can't you use a pointer?</p></pre>
