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// Copyright 2015 Google Inc. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package uuid
import (
"database/sql/driver"
"errors"
"fmt"
)
// Scan implements sql.Scanner so UUIDs can be read from databases transparently
// Currently, database types that map to string and []byte are supported. Please
// consult database-specific driver documentation for matching types.
func (uuid *UUID) Scan(src interface{}) error {
switch src.(type) {
case string:
// if an empty UUID comes from a table, we return a null UUID
if src.(string) == "" {
return nil
}
// see uuid.Parse for required string format
parsed := Parse(src.(string))
if parsed == nil {
return errors.New("Scan: invalid UUID format")
}
*uuid = parsed
case []byte:
b := src.([]byte)
// if an empty UUID comes from a table, we return a null UUID
if len(b) == 0 {
return nil
}
// assumes a simple slice of bytes if 16 bytes
// otherwise attempts to parse
if len(b) == 16 {
*uuid = UUID(b)
} else {
u := Parse(string(b))
if u == nil {
return errors.New("Scan: invalid UUID format")
}
*uuid = u
}
default:
return fmt.Errorf("Scan: unable to scan type %T into UUID", src)
}
return nil
}
// Value implements sql.Valuer so that UUIDs can be written to databases
// transparently. Currently, UUIDs map to strings. Please consult
// database-specific driver documentation for matching types.
func (uuid UUID) Value() (driver.Value, error) {
return uuid.String(), nil
}