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