A brief analysis of how soft-deleted data in laravel can still be read

Laravel is a popular PHP web application framework that provides many powerful features and tools that simplify the web application development process. Among them, Laravel's soft deletion function is a very useful feature. It can achieve some special needs while retaining data integrity by marking records as deleted instead of immediately deleting records from the database.

However, a question that many Laravel developers may have encountered is, can soft-deleted data still be read? In this article, we will explore this problem and its solutions.

First of all, you need to understand the principle of soft deletion in Laravel. Soft deletion is implemented by adding a deleted_at field to the data table. When using soft deletion, when a record is deleted, Laravel just sets the deleted_at field of the record to a non-empty value instead of deleting the record, thus achieving the effect of "soft deletion". When querying data, Laravel will automatically filter out records with a non-empty deleted_at field to achieve the effect of querying only records that have not been "soft deleted".

Therefore, soft-deleted data can still be read out, even if the soft-deleted records still exist in the database. However, by default, Laravel's soft deletion will only automatically filter records that have been marked as "soft deleted". If you need to query both soft deleted and undeleted records, you need to manually add the withTrashed method to the query.

withTrashed method returns soft deleted records, while querying records that are not soft deleted still uses the usual method:

// 查询未被软删除的记录
$users = DB::table('users')->whereNull('deleted_at')->get();

// 查询被软删除的记录
$trashedUsers = DB::table('users')->whereNotNull('deleted_at')->get();

// 同时查询未被软删除和被软删除的记录
$usersWithTrashed = DB::table('users')->withTrashed()->get();

In the above example, we used the whereNull and whereNotNull methods to query the undeleted records. Deleted and deleted records, and the withTrashed method is also used to query soft-deleted records.

In addition to the withTrashed method, Laravel also provides two other methods: onlyTrashed and restore, which are used to query soft-deleted records and restore soft-deleted records. Its usage is as follows:

// 查询被软删除的记录
$trashedUsers = DB::table('users')->onlyTrashed()->get();

// 恢复软删除的记录
DB::table('users')->where('id', $id)->restore();

In summary, Laravel soft-deleted data can still be read out, but by default only records that have not been soft-deleted are queried. If you need to query soft deleted and undeleted records at the same time, you need to manually add the withTrashed method. In addition, you can also use the onlyTrashed method to query soft-deleted records and the restore method to restore soft-deleted records. Mastering these methods can allow developers to better apply Laravel's soft deletion function and improve development efficiency.

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