112 lines
2.7 KiB
Go
112 lines
2.7 KiB
Go
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package types
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import (
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"database/sql/driver"
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"fmt"
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"time"
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)
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// 默认时间格式
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const dateFormat = "2006-01-02 15:04:05.000"
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// DateTime 自定义时间类型
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type DateTime time.Time
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// Scan implements the Scanner interface.
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func (dt *DateTime) Scan(value any) error {
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// mysql 内部日期的格式可能是 2006-01-02 15:04:05 +0800 CST 格式，所以检出的时候还需要进行一次格式化
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tTime, _ := time.ParseInLocation("2006-01-02 15:04:05 +0800 CST", value.(time.Time).String(), time.Local)
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*dt = DateTime(tTime)
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return nil
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}
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// Value implements the driver Valuer interface.
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func (dt DateTime) Value() (driver.Value, error) {
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// 0001-01-01 00:00:00 属于空值，遇到空值解析成 null 即可
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if dt.String() == "0001-01-01 00:00:00.000" {
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return nil, nil
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}
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return []byte(dt.Format(dateFormat)), nil
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}
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// 用于 fmt.Println 和后续验证场景
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func (dt DateTime) String() string {
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return dt.Format(dateFormat)
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}
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// Format 格式化
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func (dt DateTime) Format(fm string) string {
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return time.Time(dt).Format(fm)
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}
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// After 时间比较
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func (dt *DateTime) After(now time.Time) bool {
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return time.Time(*dt).After(now)
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}
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// Before 时间比较
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func (dt *DateTime) Before(now time.Time) bool {
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return time.Time(*dt).Before(now)
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}
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// IBefore 时间比较
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func (dt *DateTime) IBefore(now DateTime) bool {
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return dt.Before(time.Time(now))
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}
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// SubTime 对比
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func (dt DateTime) SubTime(t time.Time) time.Duration {
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return dt.ToTime().Sub(t)
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}
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// Sub 对比
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func (dt DateTime) Sub(t DateTime) time.Duration {
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return dt.ToTime().Sub(t.ToTime())
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}
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// ToTime 转换为golang的时间类型
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func (dt DateTime) ToTime() time.Time {
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return time.Time(dt).Local()
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}
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// IsNil 是否为空值
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func (dt DateTime) IsNil() bool {
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return dt.Format(dateFormat) == "0001-01-01 00:00:00.000"
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}
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// Unix 实现Unix函数
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func (dt DateTime) Unix() int64 {
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return dt.ToTime().Unix()
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}
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// EndOfCentury 获取本世纪最后时间
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func (dt DateTime) EndOfCentury() DateTime {
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yearEnd := time.Now().Local().Year()/100*100 + 99
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return DateTime(time.Date(yearEnd, 12, 31, 23, 59, 59, 999999999, time.Local))
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}
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// ======== 序列化 ========
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// MarshalJSON 时间到字符串
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func (dt DateTime) MarshalJSON() ([]byte, error) {
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// 过滤掉空数据
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if dt.IsNil() {
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return []byte("\"\""), nil
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}
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output := fmt.Sprintf(`"%s"`, dt.Format("2006-01-02 15:04:05"))
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return []byte(output), nil
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}
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// UnmarshalJSON 字符串到时间
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func (dt *DateTime) UnmarshalJSON(b []byte) error {
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if len(b) == 2 {
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*dt = DateTime{}
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return nil
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}
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// 解析指定的格式
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//now, err := time.ParseInLocation(`"`+dateFormat+`"`, string(b), time.Local)
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now, err := time.ParseInLocation(dateFormat, string(b), time.Local)
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*dt = DateTime(now)
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return err
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}
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