thinkphp 5 multiple database connection

I recently worked on a project that required connecting to multiple databases. I read the distributed database in the manual. After setting it up according to the above, I was still a little confused about what to do next. Then I guessed the next way of writing based on the manual to connect to the database and successfully add data, but I don’t know how to do it. If there are any problems with the writing, please ask the experts for guidance
    // database.php 中配置   主要修改这两项配置<br> <br>     // 数据库名  'database'    => '默认数据库的名称,第二个数据库的名称',<br>    'database'    => 'a,b',<br> <br>     // 数据库部署方式:0 集中式(单一服务器),1 分布式(主从服务器)<br>     'deploy'      => 1,<br> <br>     详细配置参考手册<br>     http://www.kancloud.cn/manual/thinkphp5/118061<br> <br>     public function books(){<br>         $data['donor_name'] = 'haha';<br>         $data['donor_phone'] = '254658785545';<br> <br>         self::much('donor')->insert($data);<br>     }<br> <br>     //$db  第二个数据库的名称     $table  表名称<br>     protected function much($table,$db='b.'){<br>        return Db::table($db.$table);<br>     }

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