vendor/github.com/satori/go.uuid/sql.go

   1 // Copyright (C) 2013-2018 by Maxim Bublis <b@codemonkey.ru>
   2 //
   3 // Permission is hereby granted, free of charge, to any person obtaining
   4 // a copy of this software and associated documentation files (the
   5 // "Software"), to deal in the Software without restriction, including
   6 // without limitation the rights to use, copy, modify, merge, publish,
   7 // distribute, sublicense, and/or sell copies of the Software, and to
   8 // permit persons to whom the Software is furnished to do so, subject to
   9 // the following conditions:
  10 //
  11 // The above copyright notice and this permission notice shall be
  12 // included in all copies or substantial portions of the Software.
  13 //
  14 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  15 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  16 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  17 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  18 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  19 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  20 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  21
  22 package uuid
  23
  24 import (
  25         "database/sql/driver"
  26         "fmt"
  27 )
  28
  29 // Value implements the driver.Valuer interface.
  30 func (u UUID) Value() (driver.Value, error) {
  31         return u.String(), nil
  32 }
  33
  34 // Scan implements the sql.Scanner interface.
  35 // A 16-byte slice is handled by UnmarshalBinary, while
  36 // a longer byte slice or a string is handled by UnmarshalText.
  37 func (u *UUID) Scan(src interface{}) error {
  38         switch src := src.(type) {
  39         case []byte:
  40                 if len(src) == Size {
  41                         return u.UnmarshalBinary(src)
  42                 }
  43                 return u.UnmarshalText(src)
  44
  45         case string:
  46                 return u.UnmarshalText([]byte(src))
  47         }
  48
  49         return fmt.Errorf("uuid: cannot convert %T to UUID", src)
  50 }
  51
  52 // NullUUID can be used with the standard sql package to represent a
  53 // UUID value that can be NULL in the database
  54 type NullUUID struct {
  55         UUID  UUID
  56         Valid bool
  57 }
  58
  59 // Value implements the driver.Valuer interface.
  60 func (u NullUUID) Value() (driver.Value, error) {
  61         if !u.Valid {
  62                 return nil, nil
  63         }
  64         // Delegate to UUID Value function
  65         return u.UUID.Value()
  66 }
  67
  68 // Scan implements the sql.Scanner interface.
  69 func (u *NullUUID) Scan(src interface{}) error {
  70         if src == nil {
  71                 u.UUID, u.Valid = Nil, false
  72                 return nil
  73         }
  74
  75         // Delegate to UUID Scan function
  76         u.Valid = true
  77         return u.UUID.Scan(src)
  78 }