Adding multiple connections in Laravel [duplicate] - mysql

Question

I want to combine multiple databases in my system. Most of the time the database is MySQL; but it may differ in future i.e. Admin can generate such a reports which is use source of heterogeneous database system.
So my question is does Laravel provide any Facade to deal with such situations? Or any other framework have more suitable capabilities for problem is?

Answer 1

Tested versions (Updated)
Version
Tested (Yes/No)
4.2
No
5
Yes (5.5)
6
No
7
No
8
Yes (8.4)
9
Yes (9.2)
Define Connections
Using .env >= 5.0 (or higher)
In .env
DB_CONNECTION=mysql
DB_HOST=127.0.0.1
DB_PORT=3306
DB_DATABASE=mysql_database
DB_USERNAME=root
DB_PASSWORD=secret
DB_CONNECTION_PGSQL=pgsql
DB_HOST_PGSQL=127.0.0.1
DB_PORT_PGSQL=5432
DB_DATABASE_PGSQL=pgsql_database
DB_USERNAME_PGSQL=root
DB_PASSWORD_PGSQL=secret
In config/database.php
'mysql' => [
'driver' => env('DB_CONNECTION'),
'host' => env('DB_HOST'),
'port' => env('DB_PORT'),
'database' => env('DB_DATABASE'),
'username' => env('DB_USERNAME'),
'password' => env('DB_PASSWORD'),
],
'pgsql' => [
'driver' => env('DB_CONNECTION_PGSQL'),
'host' => env('DB_HOST_PGSQL'),
'port' => env('DB_PORT_PGSQL'),
'database' => env('DB_DATABASE_PGSQL'),
'username' => env('DB_USERNAME_PGSQL'),
'password' => env('DB_PASSWORD_PGSQL'),
],
Note: In pgsql, if DB_username and DB_password are the same, then you can use env('DB_USERNAME'), which is mentioned in .env first few lines.
Without .env <= 4.0 (or lower)
app/config/database.php
return array(
'default' => 'mysql',
'connections' => array(
# Primary/Default database connection
'mysql' => array(
'driver' => 'mysql',
'host' => '127.0.0.1',
'database' => 'mysql_database',
'username' => 'root',
'password' => 'secret'
'charset' => 'utf8',
'collation' => 'utf8_unicode_ci',
'prefix' => '',
),
# Secondary database connection
'pgsql' => [
'driver' => 'pgsql',
'host' => 'localhost',
'port' => '5432',
'database' => 'pgsql_database',
'username' => 'root',
'password' => 'secret',
'charset' => 'utf8',
'prefix' => '',
'schema' => 'public',
]
),
);
Schema / Migration
Run the connection() method to specify which connection to use.
Schema::connection('pgsql')->create('some_table', function($table)
{
$table->increments('id'):
});
Or, at the top, define a connection.
protected $connection = 'pgsql';
Query Builder
$users = DB::connection('pgsql')->select(...);
Model (In Laravel >= 5.0 (or higher))
Set the $connection variable in your model
class ModelName extends Model { // extend changed
protected $connection = 'pgsql';
}
Eloquent (In Laravel <= 4.0 (or lower))
Set the $connection variable in your model
class SomeModel extends Eloquent {
protected $connection = 'pgsql';
}
Transaction Mode
DB::transaction(function () {
DB::connection('mysql')->table('users')->update(['name' => 'John']);
DB::connection('pgsql')->table('orders')->update(['status' => 'shipped']);
});
or
DB::connection('mysql')->beginTransaction();
try {
DB::connection('mysql')->table('users')->update(['name' => 'John']);
DB::connection('pgsql')->beginTransaction();
DB::connection('pgsql')->table('orders')->update(['status' => 'shipped']);
DB::connection('pgsql')->commit();
DB::connection('mysql')->commit();
} catch (\Exception $e) {
DB::connection('mysql')->rollBack();
DB::connection('pgsql')->rollBack();
throw $e;
}
You can also define the connection at runtime via the setConnection method or the on static method:
class SomeController extends BaseController {
public function someMethod()
{
$someModel = new SomeModel;
$someModel->setConnection('pgsql'); // non-static method
$something = $someModel->find(1);
$something = SomeModel::on('pgsql')->find(1); // static method
return $something;
}
}
Note: Be careful about building relationships with tables across databases! It is possible to do, but it can come with caveats depending on your database and settings.
From Laravel Docs
Using Multiple Database Connections
You may access each connection via the connection method on the DB facade when using multiple connections. The name passed to the connection method should correspond to one of the connections listed in your config/database.php configuration file:
$users = DB::connection('foo')->select(...);
You may also access the raw, underlying PDO instance using the getPdo method on a connection instance:
$pdo = DB::connection()->getPdo();
Useful Links
Laravel 5 multiple database connections FROM laracasts.com
Connect multiple databases in Laravel FROM tutsnare.com
Multiple DB Connections in Laravel FROM fideloper.com

Answer 2

In Laravel 5.1, you specify the connection:
$users = DB::connection('foo')->select(...);
Default, Laravel uses the default connection. It is simple, isn't it?
Read more here: http://laravel.com/docs/5.1/database#accessing-connections

Answer 3

Actually, DB::connection('name')->select(..) doesnt work for me, because 'name' has to be in double quotes: "name"
Still, the select query is executed on my default connection. Still trying to figure out, how to convince Laravel to work the way it is intended: change the connection.
Edit: I figured it out. After debugging Laravels DatabaseManager it turned out my database.php (config file) (inside $this->app) was wrong. In the section "connections" I had stuff like "database" with values of the one i copied it from. In clear terms, instead of
env('DB_DATABASE', 'name')
I needed to place something like
'myNewName'
since all connections were listed with the same values for the database, username, password, etc. which of course makes little sense if I want to access at least another database name
Therefore, every time I wanted to select something from another database I always ended up in my default database

Answer 4

Laravel has inbuilt support for multiple database systems, you need to provide connection details in config/database.php file
return [
'default' => env('DB_CONNECTION', 'mysql'),
'connections' => [
'mysql' => [
'driver' => 'mysql',
'host' => env('DB_HOST', '127.0.0.1'),
'port' => env('DB_PORT', '3306'),
'database' => env('DB_DATABASE', 'forge'),
'username' => env('DB_USERNAME', 'forge'),
'password' => env('DB_PASSWORD', ''),
'charset' => 'utf8',
'collation' => 'utf8_unicode_ci',
'prefix' => '',
'strict' => false,
'engine' => null,
],
'mysqlOne' => [
'driver' => 'mysql',
'host' => env('DB_HOST_ONE', '127.0.0.1'),
'port' => env('DB_PORT', '3306'),
'database' => env('DB_DATABASE_ONE', 'forge'),
'username' => env('DB_USERNAME_ONE', 'forge'),
'password' => env('DB_PASSWORD_ONE', ''),
'charset' => 'utf8',
'collation' => 'utf8_unicode_ci',
'prefix' => '',
'strict' => false,
'engine' => null,
],
];
Once you have this you can create two base model class for each connection and define the connection name in those models
//BaseModel.php
protected $connection = 'mysql';
//BaseModelOne.php
protected $connection = 'mysqlOne';
You can extend these models to create more models for tables in each DB.

Answer 5

Also you can use postgres fdw system
https://www.postgresql.org/docs/9.5/postgres-fdw.html
You will be able to connect different db in postgres. After that, in one query, you can access tables that are in different databases.

Answer 6

This worked for me
The Middleware:
<?php
namespace App\Http\Middleware;
use Config;
use Closure;
use DB;
class DBSelect
{
public function handle($request, Closure $next)
{
//$db_name = "db1";
$db_name = "db2";
Config::set('database.connections.mysql.database', $db_name);
DB::reconnect('mysql');
return $next($request);
}
}
global Kernel.php
protected $middleware = [
.....
\App\Http\Middleware\DBSelect::class,
];
I changed some code from this answer (https://stackoverflow.com/a/64744187/4514022) and it worked for me.

Answer 7

Not a good solution if you want to clone the existing system and to run the existing code on a new database for a new customer.
We would have to edit hundreds of eloquent calls to insert the DB::connection('foo')