Backend Development
PHP Tutorial
A brief analysis of the data object mapping mode of PHP design patterns, a brief analysis of the design patterns_PHP tutorial
A brief analysis of the data object mapping mode of PHP design patterns, a brief analysis of the design patterns_PHP tutorial
A brief analysis of the data object mapping mode of PHP design patterns, a brief analysis of the design patterns
There are many various patterns in the design patterns in PHP, here we are here to help you Let’s introduce an uncommon data mapping mode. I hope the article can help you.
Data mapping mode allows you to better organize your application to interact with the database.
The data mapping mode reduces the density of the combination between the attributes of the object and the table fields in which they are stored. The essence of the data mapping pattern is a class, which maps or translates the attributes or methods of the class to the corresponding fields of the database, and vice versa.
The role (work) of data mapping is to understand the information presented by both parties and to control the access to the information, such as based on the information stored in the data table
Rebuild a new domain object, or use domain object information to update or delete related data in the data table.
There are many ways to implement the storage of mapping relationships between object-oriented code and database tables and fields. One possible method is to store this mapping relationship in the data mapping class by hand coding.
An alternative is to use PHP arrays and encode them into the class itself. This class can also obtain data from external sources, such as INI or XML files.
The data object mapping mode maps objects and data storage. Operations on an object will be mapped to operations on data storage.
Implement the data object mapping mode in the code and implement an ORM class to map complex SQL statements into object attribute operations. Object Relational Mapping (ORM)
ha_cl table
Hacl.php
<?php
namespace Baobab;
class Hacl{
public $id;
public $haclname;
public $haclcode;
public $hacls;
protected $db;
function __construct($id){
$this->db = new \Baobab\Database\Mysqli();
$this->db->connect('127.0.0.1', 'root', '', 'test');
$res = $this->db->query("select * from ha_cl where id = {$id}");
$data = $res->fetch_assoc();
$this->id = $data['ID'];
$this->haclname = $data['ha_cl_name'];
$this->haclcode = $data['ha_cl_code'];
$this->hacls = $data['hacls'];
}
function __destruct(){
$this->db->query("update ha_cl set
ha_cl_code = '{$this->haclcode}',
ha_cl_name = '{$this->haclname}',
hacls = '{$this->hacls}'
where ID = {$this->id}
limit 1");
}
}Factory.php
<?php
namespace Baobab;
class Factory{
static function getHacl($id){
$key = 'user_'.$id;
$user = \Baobab\Register::get($key);//表中id不同表示的是不同的对象
if(!$user){
$user = new \Baobab\Hacl($id);
\Baobab\Register::set($key, $user);
}
return $user;
}
}Register.php
<?php
namespace Baobab;
class Register{
protected static $objects;
static function set($alias, $object){
self::$objects[$alias] = $object;
}
static function _unset($alias) {
unset(self::$objects[$alias]);
}
static function get($name) {
return self::$objects[$name];
}
}index.php
class Page{
function index(){
$hacl = Baobab\Factory::getHacl(13);
$hacl->haclname = '测试名称';
$this->test();
echo 'ok';
}
function test(){
$hacl = Baobab\Factory::getHacl(13);
$hacl->hacls = '测试内容';
}
}
$page = new Page();
$page->index(); Using the factory mode will create the object Hacl multiple times, which is a waste of resources. If the object is passed as a parameter, on the one hand it will bring additional usage costs. On the other hand, if this object is used in many places, errors will easily occur, so in the factory The registration tree pattern is used in the pattern to solve this problem.
The above content introduces you to the data object mapping mode of PHP design pattern. I hope it will be helpful to you!
Articles you may be interested in:
- PHP 5 Data Object (PDO) abstraction layer and Oracle
- Answer several questions on PHPCHINA: URL mapping
- Decrypt the module and operation mapping of ThinkPHP version 3.1.2
- Mapping analysis of public function paths and configuration item paths in ThinkPHP
- Detailed explanation of the use of Eloquent object-relational mapping in PHP's Laravel framework
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
1664
14
1423
52
1318
25
1269
29
1248
24
Explain JSON Web Tokens (JWT) and their use case in PHP APIs.
Apr 05, 2025 am 12:04 AM
JWT is an open standard based on JSON, used to securely transmit information between parties, mainly for identity authentication and information exchange. 1. JWT consists of three parts: Header, Payload and Signature. 2. The working principle of JWT includes three steps: generating JWT, verifying JWT and parsing Payload. 3. When using JWT for authentication in PHP, JWT can be generated and verified, and user role and permission information can be included in advanced usage. 4. Common errors include signature verification failure, token expiration, and payload oversized. Debugging skills include using debugging tools and logging. 5. Performance optimization and best practices include using appropriate signature algorithms, setting validity periods reasonably,
Explain late static binding in PHP (static::).
Apr 03, 2025 am 12:04 AM
Static binding (static::) implements late static binding (LSB) in PHP, allowing calling classes to be referenced in static contexts rather than defining classes. 1) The parsing process is performed at runtime, 2) Look up the call class in the inheritance relationship, 3) It may bring performance overhead.
What are PHP magic methods (__construct, __destruct, __call, __get, __set, etc.) and provide use cases?
Apr 03, 2025 am 12:03 AM
What are the magic methods of PHP? PHP's magic methods include: 1.\_\_construct, used to initialize objects; 2.\_\_destruct, used to clean up resources; 3.\_\_call, handle non-existent method calls; 4.\_\_get, implement dynamic attribute access; 5.\_\_set, implement dynamic attribute settings. These methods are automatically called in certain situations, improving code flexibility and efficiency.
PHP and Python: Comparing Two Popular Programming Languages
Apr 14, 2025 am 12:13 AM
PHP and Python each have their own advantages, and choose according to project requirements. 1.PHP is suitable for web development, especially for rapid development and maintenance of websites. 2. Python is suitable for data science, machine learning and artificial intelligence, with concise syntax and suitable for beginners.
PHP in Action: Real-World Examples and Applications
Apr 14, 2025 am 12:19 AM
PHP is widely used in e-commerce, content management systems and API development. 1) E-commerce: used for shopping cart function and payment processing. 2) Content management system: used for dynamic content generation and user management. 3) API development: used for RESTful API development and API security. Through performance optimization and best practices, the efficiency and maintainability of PHP applications are improved.
PHP: A Key Language for Web Development
Apr 13, 2025 am 12:08 AM
PHP is a scripting language widely used on the server side, especially suitable for web development. 1.PHP can embed HTML, process HTTP requests and responses, and supports a variety of databases. 2.PHP is used to generate dynamic web content, process form data, access databases, etc., with strong community support and open source resources. 3. PHP is an interpreted language, and the execution process includes lexical analysis, grammatical analysis, compilation and execution. 4.PHP can be combined with MySQL for advanced applications such as user registration systems. 5. When debugging PHP, you can use functions such as error_reporting() and var_dump(). 6. Optimize PHP code to use caching mechanisms, optimize database queries and use built-in functions. 7
The Enduring Relevance of PHP: Is It Still Alive?
Apr 14, 2025 am 12:12 AM
PHP is still dynamic and still occupies an important position in the field of modern programming. 1) PHP's simplicity and powerful community support make it widely used in web development; 2) Its flexibility and stability make it outstanding in handling web forms, database operations and file processing; 3) PHP is constantly evolving and optimizing, suitable for beginners and experienced developers.
Explain the match expression (PHP 8 ) and how it differs from switch.
Apr 06, 2025 am 12:03 AM
In PHP8, match expressions are a new control structure that returns different results based on the value of the expression. 1) It is similar to a switch statement, but returns a value instead of an execution statement block. 2) The match expression is strictly compared (===), which improves security. 3) It avoids possible break omissions in switch statements and enhances the simplicity and readability of the code.
