如何在FireBase的同一个键下添加多个值？(How to add multiple values under the same key for FireBase?)

如何在FireBase的同一个键下添加多个值？(How to add multiple values under the same key for FireBase?)

如何在Firebase中为同一个密钥添加多个值？ 当我执行以下操作将数据添加到我的数据库时，对象只是互相替换。

Map<String,Object> taskMap = new HashMap<>(); taskMap.put("age", "12"); taskMap.put("gender", "male"); taskMap.put("age", "45"); taskMap.put("gender", "female"); reference.setValue(taskMap);

Firebase中的数据仅显示年龄45岁，性别为女性。 它超越了12岁和性别男性。 我怎么两个都有？

How do I add multiple values for the same key in Firebase? When I do the following to add data to my database, the objects are just replacing each other.

Map<String,Object> taskMap = new HashMap<>(); taskMap.put("age", "12"); taskMap.put("gender", "male"); taskMap.put("age", "45"); taskMap.put("gender", "female"); reference.setValue(taskMap);

The data in Firebase only displayed age 45, and gender female. It overrode the age 12 and gender male. How do I have both?

最满意答案

要更新现有属性的子集或添加新属性，请使用updateChildren() ：

Map<String,Object> taskMap = new HashMap<>(); taskMap.put("age", "12"); taskMap.put("gender", "male"); taskMap.put("age", "45"); taskMap.put("gender", "female"); reference.updateChildren(taskMap);

另请参阅更新特定字段的文档 。

To update a subset of the existing properties or to add new ones, use updateChildren():

Map<String,Object> taskMap = new HashMap<>(); taskMap.put("age", "12"); taskMap.put("gender", "male"); taskMap.put("age", "45"); taskMap.put("gender", "female"); reference.updateChildren(taskMap);

Also see the documentation for updating specific fields.