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|
package mssql
import (
"database/sql/driver"
"encoding/hex"
"errors"
"fmt"
)
type UniqueIdentifier [16]byte
func (u *UniqueIdentifier) Scan(v interface{}) error {
reverse := func(b []byte) {
for i, j := 0, len(b)-1; i < j; i, j = i+1, j-1 {
b[i], b[j] = b[j], b[i]
}
}
switch vt := v.(type) {
case []byte:
if len(vt) != 16 {
return errors.New("mssql: invalid UniqueIdentifier length")
}
var raw UniqueIdentifier
copy(raw[:], vt)
reverse(raw[0:4])
reverse(raw[4:6])
reverse(raw[6:8])
*u = raw
return nil
case string:
if len(vt) != 36 {
return errors.New("mssql: invalid UniqueIdentifier string length")
}
b := []byte(vt)
for i, c := range b {
switch c {
case '-':
b = append(b[:i], b[i+1:]...)
}
}
_, err := hex.Decode(u[:], []byte(b))
return err
default:
return fmt.Errorf("mssql: cannot convert %T to UniqueIdentifier", v)
}
}
func (u UniqueIdentifier) Value() (driver.Value, error) {
reverse := func(b []byte) {
for i, j := 0, len(b)-1; i < j; i, j = i+1, j-1 {
b[i], b[j] = b[j], b[i]
}
}
raw := make([]byte, len(u))
copy(raw, u[:])
reverse(raw[0:4])
reverse(raw[4:6])
reverse(raw[6:8])
return raw, nil
}
func (u UniqueIdentifier) String() string {
return fmt.Sprintf("%X-%X-%X-%X-%X", u[0:4], u[4:6], u[6:8], u[8:10], u[10:])
}
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