Firebase-ref和child有什么区别? [英] Firebase - What is the difference between ref and child?

问题描述

在Firebase中，经常使用ref和child.

In Firebase, ref and child are used a lot.

例如-firebase.database().ref('users/<user-id>')将与firebase.database().ref('users').child('<user-id>')完全相同，那么它们之间到底有什么区别?何时应使用它们中的任何一个?

For example - firebase.database().ref('users/<user-id>') will work exactly same as firebase.database().ref('users').child('<user-id>'), so what exactly is the difference between them and when should either of them be used?

推荐答案

没有区别，无论如何，您都有一个

There is no difference, in any case you have a DatabaseReference instance.

Firebase参考代表数据库中的特定位置，可用于将数据读取或写入该数据库位置.

A Firebase reference represents a particular location in your Database and can be used for reading or writing data to that Database location.

方法:

public DatabaseReference getReference (String path)

获取所提供路径的DatabaseReference.

Gets a DatabaseReference for the provided path.

方法:

public DatabaseReference child (String pathString)

获取相对于此位置的参考.

Get a reference to location relative to this one.

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