72 lines
1.8 KiB
Go
72 lines
1.8 KiB
Go
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// Go MySQL Driver - A MySQL-Driver for Go's database/sql package
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//
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// Copyright 2013 The Go-MySQL-Driver Authors. All rights reserved.
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//
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// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this file,
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// You can obtain one at http://mozilla.org/MPL/2.0/.
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package mysql
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import (
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"database/sql"
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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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// NullTime represents a time.Time that may be NULL.
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// NullTime implements the Scanner interface so
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// it can be used as a scan destination:
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//
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// var nt NullTime
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// err := db.QueryRow("SELECT time FROM foo WHERE id=?", id).Scan(&nt)
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// ...
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// if nt.Valid {
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// // use nt.Time
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// } else {
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// // NULL value
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// }
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//
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// # This NullTime implementation is not driver-specific
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//
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// Deprecated: NullTime doesn't honor the loc DSN parameter.
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// NullTime.Scan interprets a time as UTC, not the loc DSN parameter.
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// Use sql.NullTime instead.
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type NullTime sql.NullTime
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// Scan implements the Scanner interface.
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// The value type must be time.Time or string / []byte (formatted time-string),
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// otherwise Scan fails.
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func (nt *NullTime) Scan(value interface{}) (err error) {
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if value == nil {
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nt.Time, nt.Valid = time.Time{}, false
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return
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}
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switch v := value.(type) {
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case time.Time:
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nt.Time, nt.Valid = v, true
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return
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case []byte:
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nt.Time, err = parseDateTime(v, time.UTC)
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nt.Valid = (err == nil)
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return
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case string:
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nt.Time, err = parseDateTime([]byte(v), time.UTC)
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nt.Valid = (err == nil)
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return
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}
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nt.Valid = false
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return fmt.Errorf("Can't convert %T to time.Time", value)
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}
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// Value implements the driver Valuer interface.
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func (nt NullTime) Value() (driver.Value, error) {
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if !nt.Valid {
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return nil, nil
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}
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return nt.Time, nil
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}
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