Connect multiple databases dynamically in laravel [duplicate] - php

Question

This question already has answers here:
How to use multiple databases in Laravel
(7 answers)
Closed 2 years ago.
I'm building an application which requires connecting 2 database. first one is static and another one is dynamic.
config/database.php is like
'mysql' =>
array (
'driver' => 'mysql',
'host' => '127.0.0.1',
'port' => '3306',
'database' => 'blog',
'username' => 'root',
'password' => '',
'unix_socket' => '',
'charset' => 'utf8mb4',
'collation' => 'utf8mb4_unicode_ci',
'prefix' => '',
'strict' => true,
'engine' => NULL,
),
'business2' =>
array (
'driver' => 'mysql',
'host' => '127.0.0.1',
'port' => '3306',
'database' => 'blog2',
'username' => 'root',
'password' => '',
'unix_socket' => '',
'charset' => 'utf8mb4',
'collation' => 'utf8mb4_unicode_ci',
'prefix' => '',
'strict' => true,
'engine' => NULL,
),
and model code is like
Class TableNewData extends Model
{
protected $connection = 'business3';
protected $table = 'table2_data';
public function getData()
{
return $this->get()->toArray();
}
}
I am able to connect multiple databases if I give static connection details but I am unable to connect database if I give dynamic connection details like
$connection = Session::get()->connection;
or
$connection=$_SESSION('connection');
What is the best way to connect multiple databases dynamically without effecting performance of application?

Answer 1

I had the same problem as you. This blog can definitely help you out.
The Ultimate Guide for Laravel Multi Tenant with Multi Database
Here is how the config/database.php file looks like based on your situation. Since the second one is dynamic, there is no need to define the database.
'mysql' => [
'driver' => 'mysql',
'host' => env('DB_HOST', '127.0.0.1'),
'port' => env('DB_PORT', '3306'),
'database' => env('DB_DATABASE', 'blog'),
'username' => env('DB_USERNAME', 'root'),
'password' => env('DB_PASSWORD', 'password'),
'unix_socket' => env('DB_SOCKET', ''),
'charset' => 'utf8mb4',
'collation' => 'utf8mb4_unicode_ci',
'prefix' => '',
'strict' => true,
'engine' => 'InnoDB',
],
'business' => [
'driver' => 'mysql',
'host' => env('DB_HOST', '127.0.0.1'),
'port' => env('DB_PORT', '3306'),
'database' => '',
'username' => env('DB_USERNAME', 'root'),
'password' => env('DB_PASSWORD', 'password'),
'unix_socket' => env('DB_SOCKET', ''),
'charset' => 'utf8mb4',
'collation' => 'utf8mb4_unicode_ci',
'prefix' => '',
'strict' => true,
'engine' => 'InnoDB',
],
Basically, set up a database helper function which connects to the database at runtime and then calls it in the right middleware.I just put the helper file at database/utilities/helpers.php
function connect($hostname, $username, $password, $database)
{
// Erase the tenant connection, thus making Laravel get the default values all over again.
DB::purge('business');
// Make sure to use the database name we want to establish a connection.
Config::set('database.connections.tenant.host', $hostname);
Config::set('database.connections.tenant.database', $database);
Config::set('database.connections.tenant.username', $username);
Config::set('database.connections.tenant.password', $password);
// Rearrange the connection data
DB::reconnect('business');
// Ping the database. This will throw an exception in case the database does not exists.
Schema::connection('tenant')->getConnection()->reconnect();
}
Don't forget to tell the composer that the helper function can be used globally by adding those line into the composer.json file.
"autoload": {
"classmap": [
"database"
],
"files":[
"database/utilities/helpers.php"
],
"psr-4": {
"App\\": "app/"
}
},
You also want to have static and dynamic models that should be extended to define which database connections to use.
class StaticModel extends Model
{
protected $connection = 'mysql';
}
class DynamicModel extends Model
{
protected $connection = 'business';
}
In the middleware set up the dynamic database connection according to the database name.
connect(getenv('DB_HOST'), getenv('DB_USERNAME'), getenv('DB_PASSWORD'), getenv('DB_SYMBOL') . $databasename);
Thus, you can use the model as normal but it has the dynamic database connections

Answer 2

One way of changing the connection at runtime is to set the values via the config:
config(['database.connections.mysql' => [
'driver' => 'mysql',
'host' => env('DB_HOST', 'localhost'),
'database' => env('DB_DATABASE', 'my_database'),
'username' => env('DB_USERNAME', 'my_user'),
'password' => env('DB_PASSWORD', 'my_password'),
'charset' => 'utf8',
'collation' => 'utf8_unicode_ci',
'prefix' => '',
'strict' => false,
]]);
This can be applied in a middleware to dynamically switch between tenant databases, for example.
You can also specify a connection via the DB facade:
DB::connection('mysql_2')->select(...);