如何在 Firebase 中在经过身份验证的用户和数据库之间建立链接? [英] How to link between Authenticated users and Database in Firebase?

问题描述

我的 Android 应用中有 Firebase 身份验证.我的问题是如何在经过身份验证的用户(出现在 Firebase 控制台的 Firebase::Auth 选项卡中)和数据库(Firebase::Database 选项卡)之间建立链接.

I have Firebase Authentication in my Android app. My question is how do I link between authenticated users (that appear in Firebase::Auth tab in the Firebase console) and the database (Firebase::Database tab).

我需要通过Auth中出现的User UID将数据库中的数据与Auth中的相关用户关联起来，并最终发送查询特定UID 以获取Database 中的相关信息.

I need to link data in the database with the relevant user in Auth by the User UID that appears in Auth, and eventually send queries about a specific UID to get the relevant info in Database.

是否有一些自动/内置的东西可以做到这一点，或者每次我对用户进行身份验证时，我是否必须在 Database 中为用户创建一个新条目，然后为它创建一个 ID 字段Auth?

Is there something automatic / built-in that does that or do I have to create a new entry for a user in Database each time I authenticate a user and then create an ID field for it with the UID value that appears in Auth?

在用户管理文档中，它仅解释了将用户添加到Auth 标签并重置他们的密码.

In the User Management docs it explains only about adding users to the Auth tab and resetting their passwords.

推荐答案

认证后，使用 Firebase 提供的 UID 创建一个 child，并将其值设置为您的用户类:

After authentication, create a child with the UID given by Firebase, and set its value to your user class:

//get firebase user
FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();

//get reference
DatabaseReference ref = FirebaseDatabase.getInstance().getReference(USERS_TABLE);

//build child
ref.child(user.getUid()).setValue(user_class);

USERS_TABLE 是 root 的直接子级.

USERS_TABLE is a direct child of root.

然后当你想要检索数据时，通过其 UID 获取对用户的引用，监听 addListenerForSingleValueEvent()(仅调用一次)，并通过反射迭代结果:

Then when you want to retrieve the data, get a reference to the user by its UID, listen for addListenerForSingleValueEvent() (invoked only once), and iterate over the result with reflection:

//get firebase user
FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();

//get reference
DatabaseReference ref = FirebaseDatabase.getInstance().getReference(USERS_TABLE).child(user.getUid());
//IMPORTANT: .getReference(user.getUid()) will not work although user.getUid() is unique. You need a full path!

//grab info
ref.addListenerForSingleValueEvent(new ValueEventListener() {
    @Override
    public void onDataChange(DataSnapshot dataSnapshot) {
        final Profile tempProfile = new Profile(); //this is my user_class Class
        final Field[] fields = tempProfile.getClass().getDeclaredFields();
        for(Field field : fields){
            Log.i(TAG, field.getName() + ": " + dataSnapshot.child(field.getName()).getValue());
        }
    }

    @Override
    public void onCancelled(DatabaseError databaseError) {
    }
});

或者没有反射:

@Override
public void onDataChange(DataSnapshot dataSnapshot) {
    final Profile p = dataSnapshot.getValue(Profile.class);
}

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