ios - 如何在 firebase 中执行类似 sql 的查询？

Question

如果我的查询如下所示，我该如何查询 firebase:

Select * from table where employment="teacher" or employment="programmer"

Answer 1

firebase 实时数据库中没有 like 查询。您可以使用以下查询:

Method              Usage
queryOrderedByKey   Order results by child keys.
queryOrderedByValue Order results by child values.
queryOrderedByChild Order results by the value of a specified child key or nested child path.

https://firebase.google.com/docs/database/ios/lists-of-data#sort_data

要解决您的问题，您可以将数据库更改为以下内容:

users
 pushId
    name       : peter
    employment : programmer
    group      : teachProg
 pushId
    name       : john
    employment : teacher
    group      : teachProg

然后使用queryOrderByChild("group").queryEqualToValue("teachProg")，您将能够检索所有的程序员或教师用户