add IsEmpty function for gdb.Record/Result

database/gdb/gdb_type_record.go

@@ -46,3 +46,8 @@ func (r Record) Struct(pointer interface{}) error {
 	}
 	return mapToStruct(r.Map(), pointer)
 }
+
+// IsEmpty checks and returns whether <r> is empty.
+func (r Record) IsEmpty() bool {
+	return len(r) == 0
+}

database/gdb/gdb_type_result.go

@@ -131,3 +131,8 @@ func (r Result) Structs(pointer interface{}) (err error) {
 	reflect.ValueOf(pointer).Elem().Set(array)
 	return nil
 }
+
+// IsEmpty checks and returns whether <r> is empty.
+func (r Result) IsEmpty() bool {
+	return len(r) == 0
+}