Home Backend Development PHP Tutorial Detailed introduction about hasOne

Detailed introduction about hasOne

Jun 11, 2017 pm 05:52 PM

hasOne and hasMany are Yii2's unique functions for multi-table related queries. It is recommended to use them when using multi-table related queries. This article mainly introduces the detailed usage of hasOne, hasMany and many-to-many related queries in Yii2. Friends who need it can refer to the preface. hasOne and hasMany are Yii2's unique functions for multi-table related queries. Multi-table related queries are usually used. It is recommended to use them when querying. Why? Because the results of related queries in this way will retain Yii2's own header sorting function, as well as the id storage value of the input in CheckboxColumn. As for whether there are other benefits, everyone needs to dig out. The author has discovered these two so far. A common benefit. There are no other related queries, such as yiidbQuery query or native SQL statement query. When the query is displayed in the list, the header of the table is black. Yii2's hasOne and hasMany multi-table related queries, whether it is a document or an article, can actually easily find the reference master. But why did the author write this article? The idea is actually very simple, because

1. Usage examples of hasOne, hasMany and many-to-many related queries in Yii2 (picture)

Detailed introduction about hasOne

Introduction: hasOne and hasMany are Yii2's unique functions for multi-table related queries. It is recommended to use them when using multi-table related queries. This article mainly introduces the detailed explanation of the usage of hasOne, hasMany and many-to-many related queries in Yii2. Friends in need can refer to

2. Detailed explanation of Yii2 hasOne(), Two methods of hasMany() to implement three-table association

Detailed introduction about hasOne

##Introduction: This article mainly introduces Yii2 hasOne(), hasMany() are two ways to implement three-table association. They are very good and have reference value. Friends in need can refer to

3. Laravel Framework - Detailed introduction to the advanced part of EloquentORM

Detailed introduction about hasOne

##Introduction: One To One Assume that the User model is associated with Phone Model, to define such an association, you need to define a phone method in the User model, which returns an association defined by the hasOne method

4.

How to query multiple tables in laravel ORM When adding paging

Introduction: Table 1 has id uname Table 2 has uid, but no uname, it is required to find out table 1.id = table 2.uid and Output the uname of Table 1, and paginate the results. The general syntax is similar to User::hasOneRecord()::pagination(12) do you know?

5.

Laravel association model Problems caused by name consistency laravel video tutorial thinkphp php laravel

Introduction: laravel: Laravel associated model problems caused by name consistency: 1. Define the associated model in Laravel , we can complete the associated query by defining the following Model. class MyPost extends Eloquent {public function myPostInfo () {return $this->hasOne('MyPostInfo');}} class MyPostInfo extends Eloquent {} 2. Use the associated model here myPostInfo(

[Related Q&A recommendations]:

About whether the hasOne object in Laravel ORM can be associated with the array one-to-one.

Laravel data table Use hasOne or hasOne and belongsTo?

php - Yii related table with optimization query to avoid N+1 query questions

laravel How to insert data relatedly?

php - laravel ORM How to add paging when querying multiple tables

The above is the detailed content of Detailed introduction about hasOne. For more information, please follow other related articles on the PHP Chinese website!

Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

How does session hijacking work and how can you mitigate it in PHP? How does session hijacking work and how can you mitigate it in PHP? Apr 06, 2025 am 12:02 AM

Session hijacking can be achieved through the following steps: 1. Obtain the session ID, 2. Use the session ID, 3. Keep the session active. The methods to prevent session hijacking in PHP include: 1. Use the session_regenerate_id() function to regenerate the session ID, 2. Store session data through the database, 3. Ensure that all session data is transmitted through HTTPS.

Explain JSON Web Tokens (JWT) and their use case in PHP APIs. 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,

Describe the SOLID principles and how they apply to PHP development. Describe the SOLID principles and how they apply to PHP development. Apr 03, 2025 am 12:04 AM

The application of SOLID principle in PHP development includes: 1. Single responsibility principle (SRP): Each class is responsible for only one function. 2. Open and close principle (OCP): Changes are achieved through extension rather than modification. 3. Lisch's Substitution Principle (LSP): Subclasses can replace base classes without affecting program accuracy. 4. Interface isolation principle (ISP): Use fine-grained interfaces to avoid dependencies and unused methods. 5. Dependency inversion principle (DIP): High and low-level modules rely on abstraction and are implemented through dependency injection.

How to debug CLI mode in PHPStorm? How to debug CLI mode in PHPStorm? Apr 01, 2025 pm 02:57 PM

How to debug CLI mode in PHPStorm? When developing with PHPStorm, sometimes we need to debug PHP in command line interface (CLI) mode...

How to automatically set permissions of unixsocket after system restart? How to automatically set permissions of unixsocket after system restart? Mar 31, 2025 pm 11:54 PM

How to automatically set the permissions of unixsocket after the system restarts. Every time the system restarts, we need to execute the following command to modify the permissions of unixsocket: sudo...

Explain late static binding in PHP (static::). 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.

How to send a POST request containing JSON data using PHP's cURL library? How to send a POST request containing JSON data using PHP's cURL library? Apr 01, 2025 pm 03:12 PM

Sending JSON data using PHP's cURL library In PHP development, it is often necessary to interact with external APIs. One of the common ways is to use cURL library to send POST�...

See all articles