remove Result interface

cloudflare/d1/result.go

@@ -10,39 +10,21 @@ type result struct {
 	resultObj js.Value
 }
 
-// Result is the interface which represents Cloudflare's D1Result type.
-// For `changes` field, RowsAffected method can be used.
-// see: https://github.com/cloudflare/workers-types/blob/v3.18.0/src/workers.json#L1608
-type Result interface {
-	// LastRowId returns id of result's last row.
-	// If LastRowId can't be retrieved, this method returns nil.
-	LastRowId() *int
-	// Duration returns duration of executed query.
-	Duration() int
-}
-
 var (
 	_ sql.Result = (*result)(nil)
-	_ Result     = (*result)(nil)
 )
 
+// LastInsertId returns id of result's last row.
+// If lastRowId can't be retrieved, this method returns error.
 func (r *result) LastInsertId() (int64, error) {
-	return 0, errors.New("d1: LastInsertId is not implemented. instead of it, please use d1.Result.LastRowId")
+	v := r.resultObj.Get("lastRowId")
+	if v.IsNull() {
+		return 0, errors.New("d1: lastRowId cannot be retrieved")
+	}
+	id := v.Int()
+	return int64(id), nil
 }
 
 func (r *result) RowsAffected() (int64, error) {
 	return int64(r.resultObj.Get("changes").Int()), nil
 }
-
-func (r *result) LastRowId() *int {
-	v := r.resultObj.Get("lastRowId")
-	if v.IsNull() {
-		return nil
-	}
-	id := v.Int()
-	return &id
-}
-
-func (r *result) Duration() int {
-	return r.resultObj.Get("duration").Int()
-}