swoole-framwork/app/config/db.php

<?php

return [
    'default' => [
        'driver'    => 'mysql',
        'host'      => '127.0.0.1',
        'database'  => 'blog',
        'username'  => 'root',
        'password'  => '123456',
        'port'      => 3306,
        'charset'   => 'utf8mb4',
        'collation' => 'utf8mb4_general_ci',
        'prefix'    => 'eb_',
    ],
    'db2' => [
        'driver'    => 'mysql',
        'host'      => '127.0.0.1',
        'database'  => 'test',
        'username'  => 'root',
        'password'  => 'root',
        'charset'   => 'utf8',
        'collation' => 'utf8_unicode_ci',
        'prefix'    => '',
    ],
];