Analyze a ThinkPHP joint table query case

Analysis of a ThinkPHP joint table query case

What I will introduce to you today is the thinkPHP joint table query case. Two tables are involved here, one is the device table doorcontroller and the administrator table weixin. The weixin_id in the device table is set as a foreign key in the management table, where the foreign key field weixin_id in the master table corresponds to the primary key field id in the slave table.

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Device table

Admin Table

In addition, we also need to reference the RelationModel.class.php file during the development process. This file is located in ThinkPHP\Library\Think\Model\RelationModel.class.php and is officially developed. As follows:

<?php
namespace Admin\Model;
use Think\Model\RelationModel;
class DoorcontrollerModel extends RelationModel{
    protected $_link = array(
        &#39;Weixin&#39;=>array(
            &#39;mapping_type&#39;      => self::HAS_ONE,
                &#39;foreign_key&#39;=>"id",//主表的外键对应的从表主键字段
                &#39;mapping_key&#39;=>&#39;weixin_id&#39;,//主表设置的外键
                &#39;as_fields&#39; => &#39;nickname&#39;,
                ),
        );
}

In this way, the result of die(var_dump($arr)) will add a nickname field on the basis of the original data, which realizes the master-slave table related query, by querying only the doorcontroller table At the same time, the nickname of its slave table weixin administrator is also queried.

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