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timestampfuncs.go
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timestampfuncs.go
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/*
* MinIO Cloud Storage, (C) 2019 MinIO, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package sql
import (
"time"
)
const (
layoutYear = "2006T"
layoutMonth = "2006-01T"
layoutDay = "2006-01-02T"
layoutMinute = "2006-01-02T15:04Z07:00"
layoutSecond = "2006-01-02T15:04:05Z07:00"
layoutNanosecond = "2006-01-02T15:04:05.999999999Z07:00"
)
var (
tformats = []string{
layoutYear,
layoutMonth,
layoutDay,
layoutMinute,
layoutSecond,
layoutNanosecond,
}
)
func parseSQLTimestamp(s string) (t time.Time, err error) {
for _, f := range tformats {
t, err = time.Parse(f, s)
if err == nil {
break
}
}
return
}
// FormatSQLTimestamp - returns the a string representation of the
// timestamp as used in S3 Select
func FormatSQLTimestamp(t time.Time) string {
_, zoneOffset := t.Zone()
hasZone := zoneOffset != 0
hasFracSecond := t.Nanosecond() != 0
hasSecond := t.Second() != 0
hasTime := t.Hour() != 0 || t.Minute() != 0
hasDay := t.Day() != 1
hasMonth := t.Month() != 1
switch {
case hasFracSecond:
return t.Format(layoutNanosecond)
case hasSecond:
return t.Format(layoutSecond)
case hasTime || hasZone:
return t.Format(layoutMinute)
case hasDay:
return t.Format(layoutDay)
case hasMonth:
return t.Format(layoutMonth)
default:
return t.Format(layoutYear)
}
}
const (
timePartYear = "YEAR"
timePartMonth = "MONTH"
timePartDay = "DAY"
timePartHour = "HOUR"
timePartMinute = "MINUTE"
timePartSecond = "SECOND"
timePartTimezoneHour = "TIMEZONE_HOUR"
timePartTimezoneMinute = "TIMEZONE_MINUTE"
)
func extract(what string, t time.Time) (v *Value, err error) {
switch what {
case timePartYear:
return FromInt(int64(t.Year())), nil
case timePartMonth:
return FromInt(int64(t.Month())), nil
case timePartDay:
return FromInt(int64(t.Day())), nil
case timePartHour:
return FromInt(int64(t.Hour())), nil
case timePartMinute:
return FromInt(int64(t.Minute())), nil
case timePartSecond:
return FromInt(int64(t.Second())), nil
case timePartTimezoneHour:
_, zoneOffset := t.Zone()
return FromInt(int64(zoneOffset / 3600)), nil
case timePartTimezoneMinute:
_, zoneOffset := t.Zone()
return FromInt(int64((zoneOffset % 3600) / 60)), nil
default:
// This does not happen
return nil, errNotImplemented
}
}
func dateAdd(timePart string, qty float64, t time.Time) (*Value, error) {
var duration time.Duration
switch timePart {
case timePartYear:
return FromTimestamp(t.AddDate(int(qty), 0, 0)), nil
case timePartMonth:
return FromTimestamp(t.AddDate(0, int(qty), 0)), nil
case timePartDay:
return FromTimestamp(t.AddDate(0, 0, int(qty))), nil
case timePartHour:
duration = time.Duration(qty) * time.Hour
case timePartMinute:
duration = time.Duration(qty) * time.Minute
case timePartSecond:
duration = time.Duration(qty) * time.Second
default:
return nil, errNotImplemented
}
return FromTimestamp(t.Add(duration)), nil
}
const (
dayInNanoseconds = time.Hour * 24
)
// dateDiff computes the difference between two times in terms of the
// `timePart` which can be years, months, days, hours, minutes or
// seconds. For difference in years, months or days, the time part,
// including timezone is ignored.
func dateDiff(timePart string, ts1, ts2 time.Time) (*Value, error) {
if ts2.Before(ts1) {
v, err := dateDiff(timePart, ts2, ts1)
v.negate()
return v, err
}
duration := ts2.Sub(ts1)
y1, m1, d1 := ts1.Date()
y2, m2, d2 := ts2.Date()
dy, dm := int64(y2-y1), int64(m2-m1)
switch timePart {
case timePartYear:
if m2 > m1 || (m2 == m1 && d2 >= d1) {
return FromInt(dy), nil
}
return FromInt(dy - 1), nil
case timePartMonth:
months := 12 * dy
if m2 >= m1 {
months += dm
} else {
months += 12 + dm
}
if d2 < d1 {
months--
}
return FromInt(months), nil
case timePartDay:
// To compute the number of days between two times
// using the time package, zero out the time portions
// of the timestamps, compute the difference duration
// and then divide by the length of a day.
d1 := time.Date(y1, m1, d1, 0, 0, 0, 0, time.UTC)
d2 := time.Date(y2, m2, d2, 0, 0, 0, 0, time.UTC)
diff := d2.Sub(d1)
days := diff / dayInNanoseconds
return FromInt(int64(days)), nil
case timePartHour:
hours := duration / time.Hour
return FromInt(int64(hours)), nil
case timePartMinute:
minutes := duration / time.Minute
return FromInt(int64(minutes)), nil
case timePartSecond:
seconds := duration / time.Second
return FromInt(int64(seconds)), nil
default:
}
return nil, errNotImplemented
}