Firestore Firebase Android搜索和更新查询 [英] Firestore firebase Android search and update query

问题描述

我正在尝试更新 FireBase Firestore 中的集合中现有文档的字段.我想使用其字段之一来搜索该文档. 我的收藏名称是投诉"， 我的文档的结构看起来像-

I am trying to update a field of existing document in my collection in FireBase Firestore. I want to search that document using one of its field. My collection name is "complaints", My document's structure looks like --

complainant_Name: "XYZ"
complaint_Details : "some random details"
e_Mail: "[e-mail]"
id: 5
phone_No: "1234567890" 

我要搜索文档，如果文档的"id"字段为5，我想更新文档，说将"complainant_Name"字段更改为"ABC".如何在Java Android中为此查询编写代码?在 Firebase Firestore 中搜索后，我找不到任何能说明如何更新的代码源.

I want to search documents and if "id" field of a document is say 5, I want to update it say change "complainant_Name" field to "ABC". How to write the code for this query in java android? I couldn't find any code source which tells how to update after searching in Firebase Firestore.

推荐答案

要解决此问题，请使用以下代码行:

To solve this, please use the following lines of code:

FirebaseFirestore rootRef = FirebaseFirestore.getInstance();
CollectionReference complaintsRef = rootRef.collection("complaints");
complaintsRef.whereEqualTo("id", 5).get().addOnCompleteListener(new OnCompleteListener<QuerySnapshot>() {
    @Override
    public void onComplete(@NonNull Task<QuerySnapshot> task) {
        if (task.isSuccessful()) {
            for (QueryDocumentSnapshot document : task.getResult()) {
                Map<Object, String> map = new HashMap<>();
                map.put("complainant_Name", "ABC");
                complaintsRef.document(document.getId()).set(map, SetOptions.merge());
            }
        }
    }
});

使用此代码后，属性complainant_Name将保存ABC的值.

After using this code, the property complainant_Name will hold the value of ABC.

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