Laravel development: How to use Laravel Eloquent to operate the database?

Laravel development: How to use Laravel Eloquent to operate the database?

Laravel is an excellent PHP framework that has many features such as simplicity, intuitiveness, and flexibility. As developers, we need to deal with databases frequently. In Laravel, we can use Eloquent to operate the database. It is Laravel's ORM (Object Relational Mapping) implementation. It provides a powerful and rich query constructor and model correlation support, which can help us operate the database more conveniently. Next, this article mainly introduces how to use Eloquent to perform CRUD operations.

1. Define the model

The core concept of Eloquent is the model (Model), which is the object we interact with the database and corresponds to the tables in the database. In Laravel, we can use Artisan commands to generate models.

php artisan make:model User

The above command will create a User model file in the app directory. One of the simplest User models is as follows:

<?php

namespace App;

use IlluminateDatabaseEloquentModel;

class User extends Model
{
    //
}

2. Insert data

To use Eloquent to create a new record, you need to use the create method of the model. The create method accepts an array as a parameter. The array The key names in correspond to the column names in the table. For example, we insert a piece of data into the users table, as follows:

$user = new User;
$user->name = 'Tom';
$user->age = 18;
$user->save();

Or it can be simplified to:

$user = User::create([
    'name' => 'Tom',
    'age' => 18,
]);

3. Query data

Eloquent query data is very Simple, here are some common query methods.

Get all records:

$users = User::all();

Get a single record:

$user = User::where('name', 'Tom')->first(); // 获取第一条匹配的记录

Get a single field:

$name = User::where('id', 1)->value('name');

Get multiple fields:

$user = User::select('name', 'age')->where('id', 1)->first();

Query result pagination:

$users = User::paginate(10); // 每页10条数据

4. Update data

Updating data using Eloquent is also very simple. The following is a sample code.

Update a single piece of data:

$user = User::where('name', 'Tom')->first();
$user->name = 'Jerry';
$user->save();

Batch update:

User::where('age', 18)->update(['age' => 20]);

5. Delete data

Deleting data using Eloquent is also very simple. Below is sample code.

Delete a single piece of data:

$user = User::where('name', 'Tom')->first();
$user->delete();

Delete multiple pieces of data:

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

Summary

This article introduces how to use Laravel Eloquent to perform CRUD operations. Eloquent provides a very simple and flexible API, making it easier and faster for us to perform database operations. Of course, Eloquent has more features and functions besides this, which we need to explore and learn in actual development.

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