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.
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