可能在firebase中有一个包含搜索查询? [英] It is possible to have a contains search query in firebase?

问题描述

我尝试过:

Query firebaseSearchQuery = 
myRef.orderByChild("from").startAt(searchText).endAt(searchText+"\uf8ff");

但是我想要这样的东西

Query firebaseSearchQuery = 
myRef.orderByChild("from").contains(searchText);

有可能吗?

推荐答案

对于小型数据集，您可以使用以下代码:

For small datasets you can use the following code:

ValueEventListener valueEventListener = new ValueEventListener() {
    @Override
    public void onDataChange(DataSnapshot dataSnapshot) {
        List<String> list = new ArrayList<>();
        for(DataSnapshot ds : dataSnapshot.getChildren()) {
            String from = ds.child("from").getValue(String.class);
            list.add(from);
        }

        for(String str : list) {
            if(str.contains(searchText)) {
                Log.d("TAG", "String found!");
            }
        }
    }

    @Override
    public void onCancelled(DatabaseError databaseError) {}
};
myRef.addListenerForSingleValueEvent(valueEventListener);

不建议将此解决方案用于大型数据集，因为您需要下载整个节点才能进行搜索.在这种情况下，阿尔戈利亚或 Elasticsearch .

This solution is not recommended for large datasets because you'll need to download the entire node in order to make a search. In this case, Algolia or Elasticsearch are recommended.

如果您打算使用 Cloud Firestore ，建议您从此查看我的答案 发布 .有关更多信息，我还建议您观看此 视频 .

If you intend to use Cloud Firestore, I recommend you to see my answer from this post. For more information, I also recommend you see this video.

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