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