Detailed introduction about hasOne

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)

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

##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

##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(

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