laravel delete writing method

Laravel is a popular PHP web framework that is popular among developers for its powerful features and ease of use. In actual development, we often need to delete data in the database. This article will introduce how to write deletions in Laravel to help you better understand and use Laravel.

1. Delete a single piece of data

Laravel provides a variety of methods for deleting a single piece of data, which are introduced below.

(1) Use the delete() method that comes with the model

In Laravel, each model comes with a delete() method that can be used to delete the database corresponding to the model. Record. The following is a sample code of the usage method:

$user = User::find(1);
$user->delete();

In the above code, we first use the find() method of the User model to find the record with ID 1, and then call the delete() method to delete the record.

It should be noted that the delete() method does not check whether other models depend on the record, so you need to ensure that it is not associated with other data before deleting the record.

(2) Use ORM’s destroy() method

ORM (Object-Relational Mapping) is a technology that maps objects to data in a relational database. Laravel has built-in ORM function, and you can use its destroy() method to delete the database records corresponding to the model.

The following is a sample code to delete a single record using the ORM's destroy() method:

User::destroy(1);

In the above code, we directly call the destroy() method of the User model and pass in the record to be deleted. ID.

It should be noted that the destroy() method does not check whether other models depend on the record, so you need to ensure that it is not associated with other data before deleting the record.

(3) Use the delete() method of Query Builder

Query Builder is a SQL statement builder in Laravel based on chain calls. It provides a wealth of methods for operating the database, including the method delete() for deleting data.

The following is a sample code to delete a single record using Query Builder's delete() method:

DB::table('users')->where('id', 1)->delete();

In the above code, we use the DB (Database) facade to call the table() method to specify the record to be deleted. Data table name, then use the where() method to specify the conditions to be deleted, and finally call the delete() method to perform the delete operation.

It should be noted that the delete() method will not trigger the model's events and hooks, so if you use these functions, it is recommended to use one of the above methods.

2. Delete data in batches

In addition to deleting a single database record, Laravel also provides a convenient method to delete data in batches. The following is an introduction to two commonly used batch deletion methods.

(1) Use ORM’s delete() method

ORM’s delete() method can not only delete a single record, but also delete multiple records in batches. The following is a sample code that uses this method to delete records in batches:

User::where('age', '>', 18)->delete();

In the above code, we first use the where() method to filter out users older than 18 years old, and then call the delete() method to delete these records.

It should be noted that the delete() method will not trigger the model's events and hooks, so if you use these functions, it is recommended to use one of the above methods.

(2) Use the delete() method of Query Builder

The delete() method of Query Builder can also be used to delete records in batches. The following is a sample code that uses this method to delete records in batches:

DB::table('users')->where('age', '>', 18)->delete();

In the above code, we use the where() method to specify the conditions to be deleted, and use the delete() method to perform the deletion operation.

It should be noted that the delete() method will not trigger the model's events and hooks, so if you use these functions, it is recommended to use one of the above methods.

3. Soft deletion

In actual development, we sometimes need to retain records of deleted data for later recovery. At this point, Soft Delete comes in handy. Laravel has a built-in soft delete feature that helps us delete data in a safe way.

The core idea of ​​soft deletion implementation is to add a deleted_at field to the database table to record the deletion time. When querying data, Laravel will automatically filter soft-deleted records so that they are not displayed in the query results.

The following is a sample code to implement soft deletion using Laravel:

First, you need to use the SoftDeletes trait in the model:

<?php

namespace App;

use IlluminateDatabaseEloquentModel;
use IlluminateDatabaseEloquentSoftDeletes;

class User extends Model
{
    use SoftDeletes;
}

Then, add the deleted_at field in the database migration:

Schema::table('users', function (Blueprint $table) {
    $table->softDeletes();
});

Finally, use the delete() method in the controller to soft delete the data:

$user = User::find(1);
$user->delete();

If you need to recover the deleted data, you can use the restore() method:

$user = User::withTrashed()->find(1);
$user->restore();

Soft deletion can help us better manage deleted data without worrying about accidentally deleting data. However, it should be noted that soft deletion is not a universal solution. In some business scenarios, data needs to be completely deleted to ensure data integrity and security.

Summarize

Laravel provides a wealth of methods for deleting data, and you can choose different methods according to specific business needs. In actual development, we need to carefully consider whether to use operations such as soft deletion or batch deletion based on the situation to ensure data integrity and security. At the same time, it should be noted that deleting data may affect the normal operation of other models or functions, and sufficient testing and verification are required.

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