CODEWITHSUNDEEP
phpmysqllaravel
zwl1619
zwl1619

Reputation: 4232

Laravel : Undefined index: driver

I am using Laravel 5.5 and I need to change database dynamically,
For example, there are two databases,db1 and db2,there is a table articles in each database.

Now I want to copy articles from db1 to db2,

in .env file, the current database is db1:

DB_DATABASE=db1

I want to change it dynamically when copying records, I tried to do it like this:

public function test()
{
    $articles=Article::all();

    Config::set("database.connections.mysql", [
        "host" => "127.0.0.1",
        "database" => "db2",
        "username" => "root",
        "password" => ""
    ]);
    //DB::purge('mysql');  //this line exists or not,it has the same error.
    DB::table('articles')->insert($articles);
    dd('ok');
}

but there is an error:

Undefined index: driver

I have many databases, so I don't want to change it in .env file.
What should I do?

update:

in config/database.php it has the two items:

'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', ''),
        'unix_socket' => env('DB_SOCKET', ''),
        'charset' => 'utf8mb4',
        'collation' => 'utf8mb4_unicode_ci',
        'prefix' => '',
        'strict' => true,
        'engine' => null,
    ],

],

and I try 

    Config::set("database.connections.mysql", [
       'mysql' => [
           "host" => "127.0.0.1",
           "database" => "db2",
           "username" => "root",
           "password" => ""
        ]
    ]);

The error still exists.

Upvotes: 2

Views: 19872

Answers (3)

N. Djokic
N. Djokic

Reputation: 1046

In my case driver was configured as well as everything else but it threw that error when I hit any endpoint. I was not able to delete cache with php artisan command so for me solution was to manually delete cache files from app/bootstrap/cache folder as old configuration stayed there and did not recognized new database connection.

Upvotes: 0

chanafdo
chanafdo

Reputation: 5134

The error is because you are missing the driver in your configuration.

A better way of changing the connection would be registering your new connection in database configuration file and change the connection at runtime.

'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', ''),
        'unix_socket' => env('DB_SOCKET', ''),
        'charset' => 'utf8mb4',
        'collation' => 'utf8mb4_unicode_ci',
        'prefix' => '',
        'strict' => true,
        'engine' => null,
    ],

    'newConnection' => [
        'driver' => 'mysql',
        'host' => env('DB_HOST', '127.0.0.1'),
        'port' => env('DB_PORT', '3306'),
        'database' => 'db2',
        'username' => env('DB_USERNAME', 'forge'),
        'password' => env('DB_PASSWORD', ''),
        'unix_socket' => env('DB_SOCKET', ''),
        'charset' => 'utf8mb4',
        'collation' => 'utf8mb4_unicode_ci',
        'prefix' => '',
        'strict' => true,
        'engine' => null,
    ],
]

Now you can change your connection using the name you used to define your new connection.

Change the default connection

Config::set('database.default', 'newConnection');
DB::reconnect('newConnection');

or change the connection for a query builder

DB::connection('newConnection')->table('articles')->insert($articles);

or if you are using Eloquent models you can set the default connection associated with the model using the connection property

protected $connection = 'newConnection';

or change at runtime by calling setConnection

(new User)->setConnection('newConnection');

If you wish to change the current connection details you can change them as you wish 

Config::set('database.connections.mysql.database', 'db2');

and after changes you need to call

DB::reconnect('mysql');

or

DB::purge('mysql');

Upvotes: 6

Exprator
Exprator

Reputation: 27553

public function test()
{
    $articles=Article::all();

    Config::set("database.connections.mysql", [
        "driver" => "mysql"
        "host" => "127.0.0.1",
        "database" => "db2",
        "username" => "root",
        "password" => ""
    ]);
    //DB::purge('mysql');  //this line exists or not,it has the same error.
    DB::table('articles')->insert($articles);
    dd('ok');
}

you were missing the driver , as laravel needs what driver of database you want to use, as you are using database.connection.mysql it will set the values in that array, but still the driver is needed 

as for example 


'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', ''),

        ],

Upvotes: 1

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