create a separate database config file in CakePHP 3 - cakephp

Question

I'm using CakePHP 3.4
default database settings exists in config/app.php
I want to separate out or override database configuration outside app.php say in config/my_db.php and load it in bootstrap.php file.
This setting will now override default database setting that exists in app.php file.
Is there some way to do this ?
Edit 2
config/my.db.php file
<?php
return [
'my_db' => [
'Datasources' => [
'default' => [
'className' => 'Cake\Database\Connection',
'driver' => 'Cake\Database\Driver\Mysql',
'persistent' => false,
'host' => 'localhost',
'username' => 'root',
'password' => 'my_pass',
'database' => 'testdb',
'encoding' => 'utf8',
'timezone' => 'UTC',
'flags' => [],
'cacheMetadata' => true,
'log' => false,
]
]
]
];
loading in bootstrap.php
Configure::load('my_db', 'default', false);

Answer 1

Create new file into folder config/
Name it whatever you like: my_db.php
Add your code configuration Code:
return [
'my_db' => [
'setting_1' => 'value_1',
'setting_2' => 'value_2',
'setting_3' => 'value_3',
],
];
Now you have to load it. Open file config/bootstrap.php,
locate line:
Configure::load('app', 'default', false);
and append this line underneath:
Configure::load('my_db', 'default');
Try THis ::
config/bootstrap.php
Configure::load('my_app', 'default','false');
config/my_app.php
<?php
return [
'Datasources' => [
'default' => [
'className' => 'Cake\Database\Connection',
'driver' => 'Cake\Database\Driver\Mysql',
'persistent' => false,
'host' => 'localhost',
'username' => 'root',
'password' => 'my_pass',
'database' => 'my_db',
'encoding' => 'utf8',
'timezone' => 'UTC',
'flags' => [],
'cacheMetadata' => true,
'log' => false,
]
]
];

Answer 2

make a copy of your app.php, name it app_override.php and change your db-settings.
Then adapt your bootstrap.php like this
try {
Configure::config('default', new PhpConfig());
Configure::load('app', 'default', false);
} catch (\Exception $e) {
exit($e->getMessage() . "\n");
}
Configure::load('app_override', 'default');