Android firebase 应用多个查询 [英] Android firebase apply multiple queries

问题描述

我有以下数据库

-KYTfJZQbg0RVzHeecIS
     createdAt: 1481204648530
     message: "rgd"
     read: false
     reciever: "583d15cf45f3330807364c55"
     sender: "58490e9945f33364ac6cd7b1"
     updateAt: 1481204648654

现在我想过滤结果为READ"==FALSE ANDSENDER"==58490e9945f33364ac6cd7b1

Now I want to filter the result for "READ"==FALSE AND "SENDER"==58490e9945f33364ac6cd7b1

我怎样才能做到这一点?

how can I achieve this?

任何帮助将不胜感激谢谢

Any help would be appreciated Thanks

-

我在android中使用它

I am using this in android as

Query query = reference.orderByChild("read").equalTo(false)
                .orderByChild("sender").equalTo(datum.getEmployer().getEmployerId());

它给了 java.lang.IllegalArgumentException:你不能组合多个 orderBy 调用！

推荐答案

firebase 不支持多个 orderbychild() 查询.

Multiple orderbychild() queries is not supported by firebase .

现在我想过滤READ"==FALSE AND的结果发件人"==58490e9945f33364ac6cd7b1

Now I want to filter the result for "READ"==FALSE AND "SENDER"==58490e9945f33364ac6cd7b1

在您的数据中创建一个新键，即 READ_SENDER 并组合两者的数据并使用这样的查询 -

Make a new key in your data i.e. READ_SENDER and combine data for both and use query like this -

-KYTfJZQbg0RVzHeecIS
     createdAt: 1481204648530
     message: "rgd"
     read: false
     reciever: "583d15cf45f3330807364c55"
     sender: "58490e9945f33364ac6cd7b1"
     read_sender : "false_58490e9945f33364ac6cd7b1"
     updateAt: 1481204648654


Query query = reference.orderByChild("read_sender").equalTo("false_"+datum.getEmployer().getEmployerId());

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