mirror of https://github.com/jackc/pgx.git
115 lines
2.2 KiB
Go
115 lines
2.2 KiB
Go
package pgtype
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import (
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"fmt"
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"io"
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"time"
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"github.com/jackc/pgx/pgio"
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)
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type Date struct {
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// time.Time is embedded to hide internal implementation. Possibly do date
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// implementation at some point rather than simply delegating to time.Time.
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// Also TODO handling Infinity and -Infinity
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t time.Time
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}
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func NewDate(year int, month time.Month, day int) *Date {
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return &Date{t: time.Date(year, month, day, 0, 0, 0, 0, time.Local)}
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}
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func (d *Date) ConvertFrom(src interface{}) error {
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switch value := src.(type) {
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case Date:
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*d = value
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case time.Time:
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*d = Date{t: value}
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default:
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if originalSrc, ok := underlyingTimeType(src); ok {
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return d.ConvertFrom(originalSrc)
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}
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return fmt.Errorf("cannot convert %v to Date", value)
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}
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return nil
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}
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func (d *Date) AssignTo(dst interface{}) error {
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return nil
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}
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func (d *Date) DecodeText(r io.Reader) error {
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size, err := pgio.ReadInt32(r)
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if err != nil {
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return err
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}
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if size == -1 {
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return fmt.Errorf("invalid length for date: %v", size)
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}
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buf := make([]byte, int(size))
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_, err = r.Read(buf)
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if err != nil {
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return err
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}
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d.t, err = time.ParseInLocation("2006-01-02", string(buf), time.Local)
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if err != nil {
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return err
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}
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return nil
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}
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func (d *Date) DecodeBinary(r io.Reader) error {
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size, err := pgio.ReadInt32(r)
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if err != nil {
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return err
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}
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if size != 4 {
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return fmt.Errorf("invalid length for date: %v", size)
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}
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dayOffset, err := pgio.ReadInt32(r)
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if err != nil {
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return err
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}
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d.t = time.Date(2000, 1, int(1+dayOffset), 0, 0, 0, 0, time.Local)
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return nil
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}
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func (d Date) EncodeText(w io.Writer) error {
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_, err := pgio.WriteInt32(w, 10)
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if err != nil {
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return nil
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}
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_, err = w.Write([]byte(d.t.Format("2006-01-02")))
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return err
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}
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func (d Date) EncodeBinary(w io.Writer) error {
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_, err := pgio.WriteInt32(w, 4)
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if err != nil {
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return err
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}
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tUnix := time.Date(d.t.Year(), d.t.Month(), d.t.Day(), 0, 0, 0, 0, time.UTC).Unix()
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dateEpoch := time.Date(2000, 1, 1, 0, 0, 0, 0, time.UTC).Unix()
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secSinceDateEpoch := tUnix - dateEpoch
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daysSinceDateEpoch := secSinceDateEpoch / 86400
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_, err = pgio.WriteInt32(w, int32(daysSinceDateEpoch))
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return err
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}
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func (d Date) Time() time.Time {
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return d.t
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}
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