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time.go
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time.go
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package pgtype
import (
"database/sql/driver"
"encoding/binary"
"fmt"
"strconv"
"github.com/thoohv5/pgx/internal/pgio"
)
type TimeScanner interface {
ScanTime(v Time) error
}
type TimeValuer interface {
TimeValue() (Time, error)
}
// Time represents the PostgreSQL time type. The PostgreSQL time is a time of day without time zone.
//
// Time is represented as the number of microseconds since midnight in the same way that PostgreSQL does. Other time
// and date types in pgtype can use time.Time as the underlying representation. However, pgtype.Time type cannot due
// to needing to handle 24:00:00. time.Time converts that to 00:00:00 on the following day.
type Time struct {
Microseconds int64 // Number of microseconds since midnight
Valid bool
}
func (t *Time) ScanTime(v Time) error {
*t = v
return nil
}
func (t Time) TimeValue() (Time, error) {
return t, nil
}
// Scan implements the database/sql Scanner interface.
func (t *Time) Scan(src any) error {
if src == nil {
*t = Time{}
return nil
}
switch src := src.(type) {
case string:
return scanPlanTextAnyToTimeScanner{}.Scan([]byte(src), t)
}
return fmt.Errorf("cannot scan %T", src)
}
// Value implements the database/sql/driver Valuer interface.
func (t Time) Value() (driver.Value, error) {
if !t.Valid {
return nil, nil
}
buf, err := TimeCodec{}.PlanEncode(nil, 0, TextFormatCode, t).Encode(t, nil)
if err != nil {
return nil, err
}
return string(buf), err
}
type TimeCodec struct{}
func (TimeCodec) FormatSupported(format int16) bool {
return format == TextFormatCode || format == BinaryFormatCode
}
func (TimeCodec) PreferredFormat() int16 {
return BinaryFormatCode
}
func (TimeCodec) PlanEncode(m *Map, oid uint32, format int16, value any) EncodePlan {
if _, ok := value.(TimeValuer); !ok {
return nil
}
switch format {
case BinaryFormatCode:
return encodePlanTimeCodecBinary{}
case TextFormatCode:
return encodePlanTimeCodecText{}
}
return nil
}
type encodePlanTimeCodecBinary struct{}
func (encodePlanTimeCodecBinary) Encode(value any, buf []byte) (newBuf []byte, err error) {
t, err := value.(TimeValuer).TimeValue()
if err != nil {
return nil, err
}
if !t.Valid {
return nil, nil
}
return pgio.AppendInt64(buf, t.Microseconds), nil
}
type encodePlanTimeCodecText struct{}
func (encodePlanTimeCodecText) Encode(value any, buf []byte) (newBuf []byte, err error) {
t, err := value.(TimeValuer).TimeValue()
if err != nil {
return nil, err
}
if !t.Valid {
return nil, nil
}
usec := t.Microseconds
hours := usec / microsecondsPerHour
usec -= hours * microsecondsPerHour
minutes := usec / microsecondsPerMinute
usec -= minutes * microsecondsPerMinute
seconds := usec / microsecondsPerSecond
usec -= seconds * microsecondsPerSecond
s := fmt.Sprintf("%02d:%02d:%02d.%06d", hours, minutes, seconds, usec)
return append(buf, s...), nil
}
func (TimeCodec) PlanScan(m *Map, oid uint32, format int16, target any) ScanPlan {
switch format {
case BinaryFormatCode:
switch target.(type) {
case TimeScanner:
return scanPlanBinaryTimeToTimeScanner{}
}
case TextFormatCode:
switch target.(type) {
case TimeScanner:
return scanPlanTextAnyToTimeScanner{}
}
}
return nil
}
type scanPlanBinaryTimeToTimeScanner struct{}
func (scanPlanBinaryTimeToTimeScanner) Scan(src []byte, dst any) error {
scanner := (dst).(TimeScanner)
if src == nil {
return scanner.ScanTime(Time{})
}
if len(src) != 8 {
return fmt.Errorf("invalid length for time: %v", len(src))
}
usec := int64(binary.BigEndian.Uint64(src))
return scanner.ScanTime(Time{Microseconds: usec, Valid: true})
}
type scanPlanTextAnyToTimeScanner struct{}
func (scanPlanTextAnyToTimeScanner) Scan(src []byte, dst any) error {
scanner := (dst).(TimeScanner)
if src == nil {
return scanner.ScanTime(Time{})
}
s := string(src)
if len(s) < 8 {
return fmt.Errorf("cannot decode %v into Time", s)
}
hours, err := strconv.ParseInt(s[0:2], 10, 64)
if err != nil {
return fmt.Errorf("cannot decode %v into Time", s)
}
usec := hours * microsecondsPerHour
minutes, err := strconv.ParseInt(s[3:5], 10, 64)
if err != nil {
return fmt.Errorf("cannot decode %v into Time", s)
}
usec += minutes * microsecondsPerMinute
seconds, err := strconv.ParseInt(s[6:8], 10, 64)
if err != nil {
return fmt.Errorf("cannot decode %v into Time", s)
}
usec += seconds * microsecondsPerSecond
if len(s) > 9 {
fraction := s[9:]
n, err := strconv.ParseInt(fraction, 10, 64)
if err != nil {
return fmt.Errorf("cannot decode %v into Time", s)
}
for i := len(fraction); i < 6; i++ {
n *= 10
}
usec += n
}
return scanner.ScanTime(Time{Microseconds: usec, Valid: true})
}
func (c TimeCodec) DecodeDatabaseSQLValue(m *Map, oid uint32, format int16, src []byte) (driver.Value, error) {
return codecDecodeToTextFormat(c, m, oid, format, src)
}
func (c TimeCodec) DecodeValue(m *Map, oid uint32, format int16, src []byte) (any, error) {
if src == nil {
return nil, nil
}
var t Time
err := codecScan(c, m, oid, format, src, &t)
if err != nil {
return nil, err
}
return t, nil
}