Preview: sql.go
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/opt/go/pkg/mod/github.com/gofrs/uuid@v4.4.0+incompatible/sql.go
// Copyright (C) 2013-2018 by Maxim Bublis <b@codemonkey.ru>
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
package uuid
import (
"database/sql"
"database/sql/driver"
"fmt"
)
var _ driver.Valuer = UUID{}
var _ sql.Scanner = (*UUID)(nil)
// Value implements the driver.Valuer interface.
func (u UUID) Value() (driver.Value, error) {
return u.String(), nil
}
// Scan implements the sql.Scanner interface.
// A 16-byte slice will be handled by UnmarshalBinary, while
// a longer byte slice or a string will be handled by UnmarshalText.
func (u *UUID) Scan(src interface{}) error {
switch src := src.(type) {
case UUID: // support gorm convert from UUID to NullUUID
*u = src
return nil
case []byte:
if len(src) == Size {
return u.UnmarshalBinary(src)
}
return u.UnmarshalText(src)
case string:
uu, err := FromString(src)
*u = uu
return err
}
return fmt.Errorf("uuid: cannot convert %T to UUID", src)
}
// NullUUID can be used with the standard sql package to represent a
// UUID value that can be NULL in the database.
type NullUUID struct {
UUID UUID
Valid bool
}
// Value implements the driver.Valuer interface.
func (u NullUUID) Value() (driver.Value, error) {
if !u.Valid {
return nil, nil
}
// Delegate to UUID Value function
return u.UUID.Value()
}
// Scan implements the sql.Scanner interface.
func (u *NullUUID) Scan(src interface{}) error {
if src == nil {
u.UUID, u.Valid = Nil, false
return nil
}
// Delegate to UUID Scan function
u.Valid = true
return u.UUID.Scan(src)
}
var nullJSON = []byte("null")
// MarshalJSON marshals the NullUUID as null or the nested UUID
func (u NullUUID) MarshalJSON() ([]byte, error) {
if !u.Valid {
return nullJSON, nil
}
var buf [38]byte
buf[0] = '"'
encodeCanonical(buf[1:37], u.UUID)
buf[37] = '"'
return buf[:], nil
}
// UnmarshalJSON unmarshals a NullUUID
func (u *NullUUID) UnmarshalJSON(b []byte) error {
if string(b) == "null" {
u.UUID, u.Valid = Nil, false
return nil
}
if n := len(b); n >= 2 && b[0] == '"' {
b = b[1 : n-1]
}
err := u.UUID.UnmarshalText(b)
u.Valid = (err == nil)
return err
}
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