Eloquent ORM technology in PHP and its application examples in the framework

With the continuous development of network technology, more and more websites or applications are facing problems such as high concurrency and large data volume. In order to deal with these problems, developers need to use efficient technologies and tools, and Eloquent ORM is one of the widely used technologies.

Eloquent ORM is an Object Relational Mapping (ORM) tool recommended in the Laravel framework. It allows developers to operate the database in an object-oriented manner, greatly improving development efficiency and availability. Maintainability.

Features of Eloquent ORM technology

1. Efficient data query and operation: Eloquent ORM supports many flexible and efficient data query and operation methods, such as chain calls, lazy loading, etc. And through Eloquent ORM, we can easily operate the relationships in the database, without the need for complex joint queries, and even realize many-to-many relationships, making data storage and maintenance more flexible.
2. Easy-to-use API: The API operation provided by Eloquent ORM is simple and easy to understand, allowing developers to become familiar with and master its use in a short period of time. And because of its good documentation and use cases, it is easier for developers to understand and get started.
3. Easy to maintain: The code written using Eloquent ORM is concise, intuitive, and highly readable, and the code is highly maintainable. Developers can use Eloquent ORM to handle complex database operations without worrying about over-development or over-debugging the program.

Application examples of Eloquent ORM technology

1. Definition of model

When using Eloquent ORM, you must define a model class. The model class represents the database entity, and the fields and relative relationships of the database table are defined in the class. Each model class corresponds to a database table. The following takes Laravel5.1 as an example to demonstrate how to define a model:

<?php

namespace App;

use IlluminateDatabaseEloquentModel;

class User extends Model
{
    /**
     * 表名
     *
     */
    protected $table = 'users';
    
    /**
     * 可以被赋值的属性
     *
     */
    protected $fillable = ['name', 'email', 'password'];
    
    /**
     * 隐藏字段
     *
     */
    protected $hidden = ['password', 'remember_token'];
}

In the above code, we define a User model class. This model class corresponds to a users table in the database. We specify the table name. , attributes and hidden fields that can be assigned values.

2. Query data

Eloquent ORM provides many simple query methods. Here are some examples:

// 查询所有用户
$users = User::all();

// 根据id查询用户
$user = User::find(1);

// 多个查询条件
$user = User::where('name', '=', 'John')
                ->where('email', '=', '[email protected]')
                ->first();

// 插入新数据
$user = new User;
$user->name = 'John';
$user->email = '[email protected]';
$user->password = bcrypt('password');
$user->save();

3. Update data

The way to update data using Eloquent ORM is very simple. Here is an example:

// 根据条件更新
User::where('id', 1)->update(['name' => 'Smith']);

// 根据主键更新
$user = User::find(1);
$user->name = 'Tom';
$user->save();

4. Delete data

The way to use Eloquent ORM to delete data is also very simple. , the following is an example:

// 根据条件删除
User::where('id', 1)->delete();

// 根据主键删除
$user = User::find(1);
$user->delete();

Summary

Eloquent ORM is an efficient and easy-to-maintain data mapping tool that allows developers to operate the database in an object-oriented manner, which not only improves development efficiency It also increases the maintainability of the code. In the Laravel framework, Eloquent ORM serves as the default ORM of the framework and is widely used in the development of various web applications and websites.

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