Using Multiple Database Connections

When using multiple connections, you may access each connection via the connection method on the DB facade. 
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();

    'connections' => [

        'sqlite' => [

            'driver' => 'sqlite',

            'database' => env('DB_DATABASE', database_path('database.sqlite')),

            'prefix' => '',

        ],

        'mysql' => [

            'driver' => 'mysql',

            'host' => env('DB_HOST', 'localhost'),

            'port' => env('DB_PORT', ''),

            'database' => env('DB_DATABASE', 'forge'),

            'username' => env('DB_USERNAME', 'forge'),

            'password' => env('DB_PASSWORD', ''),

            'charset' => 'utf8mb4',

            'collation' => 'utf8mb4_unicode_ci',

            'prefix' => '',

            'strict' => false,

            'engine' => null,

        ],

        //新增01

        'mysql_01' => [

            'driver' => 'mysql',

            'host' => env('DB_HOST_01', 'localhost'),

            'port' => env('DB_PORT_01', ''),

            'database' => env('DB_DATABASE_01', 'forge'),

            'username' => env('DB_USERNAME_01', 'forge'),

            'password' => env('DB_PASSWORD_01', ''),

            'charset' => 'utf8mb4',

            'collation' => 'utf8mb4_unicode_ci',

            'prefix' => '',

            'strict' => false,

            'engine' => null,

        ],

　　　　　//新增02

        'mysql_02' => [

            'driver' => 'mysql',

            'host' => env('DB_HOST_02', 'localhost'),

            'port' => env('DB_PORT_02', ''),

            'database' => env('DB_DATABASE_02', 'forge'),

            'username' => env('DB_USERNAME_02', 'forge'),

            'password' => env('DB_PASSWORD_02', ''),

            'charset' => 'utf8mb4',

            'collation' => 'utf8mb4_unicode_ci',

            'prefix' => '',

            'strict' => false,

            'engine' => null,

        ],

DB_CONNECTION=mysql

DB_HOST=127.0.0.1

DB_PORT=

DB_DATABASE=dataName

DB_USERNAME=root

DB_PASSWORD=

DB_HOST_01=127.0.0.1

DB_PORT_01=

DB_DATABASE_01=dataName01

DB_USERNAME_01=root

DB_PASSWORD_01=

DB_HOST_02=127.0.0.1

DB_PORT_02=

DB_DATABASE_02=dataName02

DB_USERNAME_02=root

DB_PASSWORD_02=

// connection: mysql_01  database: dataName01

$datas01 = \DB::connection('mysql_01')->table('tableName')->select('...')->first();

// connection: mysql_02  database: dataName02

$datas02 = \DB::connection('mysql_02')->table('tableName')->select('...')->first();