包含值的Firebase查询 [英] Firebase query containing value

问题描述

我试图在firebase上查询数据，找到一个包含一部分字符串的值。所以说如果我搜索应用程序的值是苹果我会有记录返回。我意识到这已被问，但我已阅读的答案都指出，firebase将集成此功能....近3年后，我似乎无法找到任何东西。

$ b $在你的例子中...

如果您严格查询以a开头的数据字符串，在这种情况下，应用程序，那么这很容易完成：

  queryStartingAtValue（app）。queryEndingAtValue（app \u {f8ff}）
  

有关更多信息，请参阅写得很好， Firebase检索数据指南

然后向下滚动到范围查询部分

完整性：

lockquote

在上面的查询中使用的f8ff字符是Unicode范围中非常高的代码点
。因为它在
Unicode中的大多数常规字符之后，查询匹配所有以b开头的值。 （在这种情况下，应用程序）

I am trying to query data on firebase to find a child with a value containing a portion of a string. So say the value is 'apple' if I search 'app' I would have that record returned. I realize this has been asked but the answers I have read all point to the fact that firebase will be integrating this feature....its almost 3 years later and I can't seem to find anything.

解决方案

In your example...

If you are strictly querying for data that starts with a string, 'app' in this case, then that's easily done with:

queryStartingAtValue("app").queryEndingAtValue("app\u{f8ff}")

For more info, see the very well written but now legacy Firebase Guide To Retrieving Data

and scroll down to the Range Queries section

For completeness:

The f8ff character used in the query above is a very high code point in the Unicode range. Because it is after most regular characters in Unicode, the query matches all values that start with a b. (app in this case)

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