Small edit (#246)

[bytom/vapor.git] / vendor / github.com / google / uuid / sql.go

diff --git a/vendor/github.com/google/uuid/sql.go b/vendor/github.com/google/uuid/sql.go
new file mode 100644 (file)
index 0000000..f326b54
--- /dev/null
+++ b/vendor/github.com/google/uuid/sql.go
@@ -0,0 +1,59 @@
+// Copyright 2016 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"
+       "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 := src.(type) {
+       case nil:
+               return nil
+
+       case string:
+               // if an empty UUID comes from a table, we return a null UUID
+               if src == "" {
+                       return nil
+               }
+
+               // see Parse for required string format
+               u, err := Parse(src)
+               if err != nil {
+                       return fmt.Errorf("Scan: %v", err)
+               }
+
+               *uuid = u
+
+       case []byte:
+               // if an empty UUID comes from a table, we return a null UUID
+               if len(src) == 0 {
+                       return nil
+               }
+
+               // assumes a simple slice of bytes if 16 bytes
+               // otherwise attempts to parse
+               if len(src) != 16 {
+                       return uuid.Scan(string(src))
+               }
+               copy((*uuid)[:], src)
+
+       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
+}