java - 在android中更新firebase数据库

Question

我想更新表中的条目而不是替换它们。我当前使用的代码:

private DatabaseReference mDatabase;  
    mDatabase =FirebaseDatabase.getInstance().getReference().child("Users").child(uid);
    HashMap<String,String> usermap = new HashMap<>();
    usermap.put("name",name);
    usermap.put("description",description);
    usermap.put("address",address);
    mDatabase.setValue(usermap);

删除数据库中用户的电子邮件字段。我用谷歌搜索了一下，结果发现 setValue 替换了所有数据。我尝试使用 updateChildren 代替，但收到错误:DatabaseReference 无法应用于 java.util.HashMap <java.lang.String,java.lang.String>)

Answer 1

Try something like:


mDatabase=FirebaseDatabase.getInstance().getReference().child("Users").child(uid);
    HashMap<String,Object> usermap = new HashMap<>(); // if you have data in diff data types go for HashMap<String,Object> or you can continue with HashMap<String,String>
    usermap.put("name",name);
    usermap.put("description",description);
    usermap.put("address",address);
    mDatabase.updateChildren(usermap); // Replace this line in your code to update.