How to add, delete, modify and check laravel models

In Laravel, the model is the basic tool for managing application data and is often used to handle database-related operations. Models allow users to perform database operations more conveniently and quickly, making programs easier to maintain.

So, how to use models to perform add, delete, modify and query operations in Laravel? Next, we will explain these operations in turn.

Add

In Laravel, adding new data is done through the create method of the model. For example, we have a Users model, and its corresponding data table is users. Now we need to add a new user:

$user = Users::create([
    'name' => 'Tom',
    'age' => 25,
    'gender' => 'male'
]);

Here, createThe method accepts an array, the keys of the array are the column names in the table, and the values ​​are the data to be added. When adding new data, Laravel will automatically process the timestamp columns of the database (created_at and updated_at).

Of course, if we need to add multiple pieces of data, we can also use the insert method. insertThe method accepts a two-dimensional array, similar to the following:

Users::insert([
    [
        'name' => 'Tom',
        'age' => 25,
        'gender' => 'male'
    ],
    [
        'name' => 'Lucy',
        'age' => 23,
        'gender' => 'female'
    ],
    // ...
]);

Modification

In Laravel, modifying data is through the model instancesave method is completed. For example, we need to modify the name of the user created above:

$user->name = 'Jerry';
$user->save();

Here, we first modify the user's name through $user->name, and then call saveMethod to save the modified data to the database.

If we need to modify data in batches, we can use the update method of the model. For example, change the names of all users aged 25 to Jerry:

Users::where('age', 25)->update(['name' => 'Jerry']);

Delete

In Laravel, deleting data is also very simple, just use the delete method of the model instance. For example, we need to delete the user added above:

$user->delete();

Here, we directly call the delete method to delete the model instance.

If we need to delete data in batches, we can use the model's destroy method, for example, delete all users aged 25 years old:

Users::where('age', 25)->delete();

Query

In Laravel, querying data is completed through the model's get method, take method, where method, etc.

For example, we need to query all users:

$users = Users::all();

Here, we call the all method to obtain the data of all users.

If we need to filter the data, we can use the where method. For example, query all users whose age is greater than or equal to 20:

$users = Users::where('age', '>=', 20)->get();

In addition, in Laravel, it also provides Many other query methods, such as: first, find, pluck, count, etc. I won’t explain it in detail here, you can refer to the official documentation for learning.

Summary

Through the introduction of this article, we have learned that Laravel's model provides a rich API, which can greatly simplify the interaction with the database and make development more effective and convenient. Hope this article is helpful to Laravel developers.

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