我想读取FireStore集合中的所有文档，并将它们提取到SQLite数据库中。我是这样实现这个过程的：

// instance of SQL controller 
DbController sqlController = DbController();
@override
Widget build(BuildContext context) {
    return scaffold (
    body : 
    //! button to start fetching 
        elevationButton(
            on tap: (){
                StreamBuilder(
                    stream: FirebaseFirestore.instance.collection("orders").snapshots(),
                    builder: (context, snapshot) {
                        int count = snapshot.data!.docs.length;
                        for(int i = 0 ; i< count ; i++){
                            Map<String , dynamic> model = snapshot.data!.docs[i].data();                        
                            int modelID = int.parse(snapshot.data!.docs[i].id);
                            sqlController.add(
                                CustomerModel(
                                    id: modelID,
                                    name: model["name"],
                                    phone: model["phone"],
                               )
                            );
                       }
                       return Container();
                    },
                );
            }
        )
    );
}

但是如何在没有streamBuilder的情况下获取文档