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:

array( 'mapping_type' => self::HAS_ONE, 'foreign_key'=>"id",//主表的外键对应的从表主键字段 'mapping_key'=>'weixin_id',//主表设置的外键 'as_fields' => 'nickname', ), ); }

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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