rebase & support sql.Scanner iface

Author: 4el0ve4ek

internal/value/cast.go

@@ -1,5 +1,10 @@
 package value
 
+import (
+	"database/sql"
+	"database/sql/driver"
+)
+
 func CastTo(v Value, dst interface{}) error {
 	if dst == nil {
 		return errNilDestination
@@ -10,6 +15,17 @@ func CastTo(v Value, dst interface{}) error {
 		return nil
 	}
 
+	if scanner, has := dst.(sql.Scanner); has {
+		dv := new(driver.Value)
+
+		err := v.castTo(dv)
+		if err != nil {
+			return err
+		}
+
+		return scanner.Scan(*dv)
+	}
+
 	if scanner, has := dst.(Scanner); has {
 		return scanner.UnmarshalYDBValue(v)
 	}

internal/value/cast_test.go

@@ -2,6 +2,7 @@ package value
 
 import (
 	"database/sql/driver"
+	"errors"
 	"reflect"
 	"testing"
 	"time"
@@ -32,12 +33,32 @@ func loadLocation(t *testing.T, name string) *time.Location {
 	return loc
 }
 
-type testStringValueScanner struct {
-	field string
-}
+type testStringValueScanner string
 
 func (s *testStringValueScanner) UnmarshalYDBValue(v Value) error {
-	return CastTo(v, &s.field)
+	var tmp string
+
+	err := CastTo(v, &tmp)
+	if err != nil {
+		return err
+	}
+
+	*s = testStringValueScanner(tmp)
+
+	return nil
+}
+
+type testStringSqlScanner string
+
+func (s *testStringSqlScanner) Scan(value any) error {
+	ts, ok := value.(string)
+	if !ok {
+		return errors.New("can't cast from " + reflect.TypeOf(value).String() + " to string")
+	}
+
+	*s = testStringSqlScanner(ts)
+
+	return nil
 }
 
 func TestCastTo(t *testing.T) {
@@ -440,7 +461,14 @@ func TestCastTo(t *testing.T) {
 			name:  xtest.CurrentFileLine(),
 			value: TextValue("text-string"),
 			dst:   ptr[testStringValueScanner](),
-			exp:   testStringValueScanner{field: "text-string"},
+			exp:   testStringValueScanner("text-string"),
+			err:   nil,
+		},
+		{
+			name:  xtest.CurrentFileLine(),
+			value: TextValue("text-string"),
+			dst:   ptr[testStringSqlScanner](),
+			exp:   testStringSqlScanner("text-string"),
 			err:   nil,
 		},
 	}

internal/value/value.go

@@ -2331,12 +2331,8 @@ type uuidValue struct {
 
 func (v *uuidValue) castTo(dst any) error {
 	switch vv := dst.(type) {
-	case *uuid.UUID:
-		*vv = v.value
-
-		return nil
 	case *driver.Value:
-		*vv = v.value
+		*vv = v.value[:]
 
 		return nil
 	case *string: