如何删除具有指定标题的firebase中的特定记录 [英] How to delete specific record in firebase having specified Title

问题描述

我当时在Web App中使用Firebase数据库，并且有类似这样的数据:

I was using Firebase Database in Web App, and have data like this yet:

如何删除标题中带有"Apple"的整个记录​​(如图所示)?

How can i delete the entire record having "Apple" in title (marked in picture)?

我写了下面的代码，但是没有用.

I wrote the below code but it's not working.

请帮助.

var abc = firebase.database().ref('firebase-test');
var key_to_delete = 'Apple';
var query = abc.orderByChild('KISNx87aYigsH3ILp0D').equalTo(key_to_delete);
query.on('child_added', function(snapshot)
{
    snapshot.ref.remove();
});

在控制台上没有给我任何错误.

It's not giving me any error in Console.

推荐答案

您正在对错误的属性进行排序/过滤.您具有他的 title 属性的值，因此应在其上订购:

You're ordering/filtering on the wrong property. You have the value of he title property, so should order on that:

var abc = firebase.database().ref('firebase-test');
var key_to_delete = 'Apple';
var query = abc.orderByChild('title').equalTo(key_to_delete);
query.on('child_added', function(snapshot)
{
    snapshot.ref.remove();
});

或者，由于您知道要删除的项目的键，因此您也可以在不查询的情况下删除该项目:

Alternative, since you know the key of the item you want to delete, you can also delete that item without a query:

var abc = firebase.database().ref('firebase-test');
abc.child("KISNx87aYigsH3ILp0D").remove();

这篇关于如何删除具有指定标题的firebase中的特定记录的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！