blocks|key|102638|text|添加包含日期的字段，并根据该日期查询要删除的字段|type|unstyled|depth|inlineStyleRanges|entityRanges|data|102639|然后你可以这样做|102640|+realm.where(MyClass.class)
++++.lowerThan("date",+someDate)
++++.findAll()
++++.deleteAllFromRealm()|code-block|syntax|javascript|102641|编辑：|offset|length|style|BOLD|102642|102643|问题是，是否有任何其他方法可以自动从领域中删除旧对象，例如我们存储数据时的条件、参数、配置或领域方法，而不是每次都进行比较。|blockquote|102644|102645|102646|不是|102647|102648|+很明显，使用查询我们可以消除任何我们想要的对象。|102649|102650|102651|链接的基于Swift的答案做了完全相同的事情。|102652|entityMap^0|0|0|0|0|3|0|0|0|0|0|0|0|1|O|0|0|0|0^^$0|@$1|2|3|4|5|6|7|15|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|16|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|17|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|18|8|@$K|19|L|1A|M|N]]|9|@]|A|$]]|$1|O|3|-4|5|6|7|1B|8|@]|9|@]|A|$]]|$1|P|3|Q|5|R|7|1C|8|@]|9|@]|A|$]]|$1|S|3|-4|5|6|7|1D|8|@]|9|@]|A|$]]|$1|T|3|-4|5|6|7|1E|8|@]|9|@]|A|$]]|$1|U|3|V|5|6|7|1F|8|@]|9|@]|A|$]]|$1|W|3|-4|5|6|7|1G|8|@]|9|@]|A|$]]|$1|X|3|Y|5|R|7|1H|8|@$K|1I|L|1J|M|N]]|9|@]|A|$]]|$1|Z|3|-4|5|6|7|1K|8|@]|9|@]|A|$]]|$1|10|3|-4|5|6|7|1L|8|@]|9|@]|A|$]]|$1|11|3|12|5|6|7|1M|8|@]|9|@]|A|$]]|$1|13|3|-4|5|6|7|1N|8|@]|9|@]|A|$]]]|14|$]]

Add a field with the date and query the ones you want to delete based on that 

Then you can do 

<pre><code> realm.where(MyClass.class)
 .lowerThan("date", someDate)
 .findAll()
 .deleteAllFromRealm()
</code></pre>

EDIT:

<blockquote>
 The question is whether there is any other way to automatically remove old objects from Realm, such as a condition when we store data, a parameter, a configuration or a Realm method, and not just compare each time. 
</blockquote>

No

<blockquote>
 It is obvious that with a query we can eliminate any object that we want.
</blockquote>

The linked Swift-based answer does the exact same thing.

blocks|key|2641295|text|不，领域本身没有这样的功能。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2641296|您的选择很好，但我不建议使用后台服务删除数据，所以在查询时请检查/删除数据。|2641297|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

Nope, there is not such functionality in Realm itself. 

Your alternative is good but I do not recommend to use background service for deleting data, so check/delete data when you query.

blocks|key|2852999|text|你可以像这样删除旧的领域数据，|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2853000|realmConfiguration+=+new+RealmConfiguration.Builder().build();
Realm.deleteRealm(realmConfiguration);
realm+=+Realm.getInstance(realmConfiguration);|code-block|syntax|javascript|2853001|在上面的行中，第二行是|2853002|Realm.deleteRealm(realmConfiguration);|2853003|执行删除旧领域数据。或者您可以删除特定类的数据，|2853004|realm.where(YourClass.class)
++++.lowerThan("date",+currentDate)
++++.findAll()
++++.deleteAllFromRealm()|2853005|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

Yupp you can delete old realm data just like this,

<pre><code>realmConfiguration = new RealmConfiguration.Builder().build();
Realm.deleteRealm(realmConfiguration);
realm = Realm.getInstance(realmConfiguration);
</code></pre>

In above lines, second line that is

<pre><code>Realm.deleteRealm(realmConfiguration);
</code></pre>

perform deleting old realm data. Or you can delete data of specific class as,

<pre><code>realm.where(YourClass.class)
 .lowerThan("date", currentDate)
 .findAll()
 .deleteAllFromRealm()
</code></pre>

blocks|key|2641341|text|在报警管理器回调时，将报警管理器设置为每天(24小时间隔)只需使用以下代码删除较旧的数据|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2641342|realm.where(BeanClass.class)
++++.lowerThan("date",+currentDate)
++++.findAll()
++++.deleteAllFromRealm();|code-block|syntax|javascript|2641343|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Set the alarm manager to every day (24 hr interval)
On alarm manager callback just use the bellow code to delete older data

<pre><code>realm.where(BeanClass.class)
 .lowerThan("date", currentDate)
 .findAll()
 .deleteAllFromRealm();
</code></pre>

Is there a simple way to delete old data from a Realm database? Like if some object has one day stored automatically delete it?
The alternative could be to add a field with the date and extract and compare it to decide if delete, but the question is if Realm has a method itself to achieve this.
<h2>I'm not looking for a query</h2>
The question is whether there is any other way to automatically remove old objects from Realm, such as a condition when we store data, a parameter, a configuration or a Realm method, and not just compare each time. It is obvious that with a query we can eliminate any object
that we want.
I already saw some similar questions (<a href="https://stackoverflow.com/questions/33641221/realm-cleaning-up-old-objects">like this one</a>) about this, but none for Android
(or Java), in the <a href="https://realm.io/docs/java/latest" rel="nofollow noreferrer">Realm docs</a> the only similar approach I found is
about <a href="https://realm.io/docs/java/latest/#migrations" rel="nofollow noreferrer">migrations.</a>
The specification of the linked question (not the answer), is just to clarify that this is not a Swift-based question and not mark it as duplicate at first glance.

Clean up old Realm objects?

数据库

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有没有一种简单的方法可以从领域数据库中删除旧数据？比如，如果某个对象已经存储了一天，会自动删除它吗？另一种选择是添加一个包含日期的字段，提取并比较它以决定是否删除，但是问题是Realm本身是否有实现此的方法。我不是在寻找一个查询问题是，是否有任何其他方法可以自动比较和删除领域中的旧对象，例如我们存储数据时的条件，参数，...

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