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sql.go (1459B)

      1 // Copyright 2016 Google Inc.  All rights reserved.
      2 // Use of this source code is governed by a BSD-style
      3 // license that can be found in the LICENSE file.
      4 
      5 package uuid
      6 
      7 import (
      8 	"database/sql/driver"
      9 	"fmt"
     10 )
     11 
     12 // Scan implements sql.Scanner so UUIDs can be read from databases transparently.
     13 // Currently, database types that map to string and []byte are supported. Please
     14 // consult database-specific driver documentation for matching types.
     15 func (uuid *UUID) Scan(src interface{}) error {
     16 	switch src := src.(type) {
     17 	case nil:
     18 		return nil
     19 
     20 	case string:
     21 		// if an empty UUID comes from a table, we return a null UUID
     22 		if src == "" {
     23 			return nil
     24 		}
     25 
     26 		// see Parse for required string format
     27 		u, err := Parse(src)
     28 		if err != nil {
     29 			return fmt.Errorf("Scan: %v", err)
     30 		}
     31 
     32 		*uuid = u
     33 
     34 	case []byte:
     35 		// if an empty UUID comes from a table, we return a null UUID
     36 		if len(src) == 0 {
     37 			return nil
     38 		}
     39 
     40 		// assumes a simple slice of bytes if 16 bytes
     41 		// otherwise attempts to parse
     42 		if len(src) != 16 {
     43 			return uuid.Scan(string(src))
     44 		}
     45 		copy((*uuid)[:], src)
     46 
     47 	default:
     48 		return fmt.Errorf("Scan: unable to scan type %T into UUID", src)
     49 	}
     50 
     51 	return nil
     52 }
     53 
     54 // Value implements sql.Valuer so that UUIDs can be written to databases
     55 // transparently. Currently, UUIDs map to strings. Please consult
     56 // database-specific driver documentation for matching types.
     57 func (uuid UUID) Value() (driver.Value, error) {
     58 	return uuid.String(), nil
     59 }