如何根据不同的if条件在android firestore中实现多个订单? [英] How to implement multiple order by in android firestore based on different if conditions?

问题描述

如何根据不同的if条件在Android Firestore 中实施多个订单?

How to implement multiple order by in Android Firestore based on different if conditions?

我想根据不同的字段值对我的Firestore项目进行排序像这样:

I want to sort my firestore items based on different fieldvalues like this:

Query query= firestoredb.collection('items').document(docid).orderby('price').orderby('itemcategory').orderby('name**');

但是要添加多少 orderby 是 dynamic .它将在运行时决定，即从排序选项中选择哪个用户.

But how many orderby will be added is dynamic . It will decide during runtime i.e what user will select from sort options.

那么我该如何在android中进行 Firestore 查询?

So how would I make my Firestore query in android?

请帮助我.

推荐答案

 Query query=firestoredb.collection("items"); 
 if(PRICE.equals("price")) {
      query = query.orderby('price'); 
 }
 if(NAME.equals("name")) {
      query = query.orderby('name'); 
 }
 if("itemCategory"){
      query = query.orderby('itemCategory');
 }

这篇关于如何根据不同的if条件在android firestore中实现多个订单?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！