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.
(src interface{})
| 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 |