数据库配置

// config/database.php
'default' => env('DB_CONNECTION', 'sqlite'),

'connections' => [
    'mysql' => [
        'driver' => 'mysql',
        'host' => env('DB_HOST', '127.0.0.1'),
        'port' => env('DB_PORT', '3306'),
        'database' => env('DB_DATABASE', 'laravel'),
        'username' => env('DB_USERNAME', 'root'),
        'password' => env('DB_PASSWORD', ''),
    ],
],

DB_CONNECTION=mysql
DB_HOST=127.0.0.1
DB_PORT=3306
DB_DATABASE=app
DB_USERNAME=app_user
DB_PASSWORD=secret

'mysql' => [
    'driver' => 'mysql',
    'read' => [
        'host' => ['10.0.0.10', '10.0.0.11'],
    ],
    'write' => [
        'host' => ['10.0.0.20'],
    ],
    'sticky' => true,

    'port' => env('DB_PORT', '3306'),
    'database' => env('DB_DATABASE', 'laravel'),
    'username' => env('DB_USERNAME', 'root'),
    'password' => env('DB_PASSWORD', ''),
],

'pgsql' => [
    'driver' => 'pgsql',
    // ...
    'pooled' => env('DB_POOLED', false),
    'direct' => array_filter([
        'host' => env('DB_DIRECT_HOST'),
        'port' => env('DB_DIRECT_PORT'),
        'username' => env('DB_DIRECT_USERNAME'),
        'password' => env('DB_DIRECT_PASSWORD'),
        'sslmode' => env('DB_DIRECT_SSLMODE'),
    ]),
],

DB::connection('pgsql::direct')->statement('create extension if not exists "uuid-ossp"');

use Illuminate\Support\Facades\DB;

$users = DB::connection('sqlite')->select('select * from users');
$pdo = DB::connection('pgsql')->getPdo();

use Illuminate\Support\Facades\DB;

$users = DB::select('select * from users where active = ?', [1]);

DB::insert('insert into users (name, email) values (?, ?)', ['Taylor', '[email protected]']);

$affected = DB::update('update users set votes = 100 where name = ?', ['Taylor']);

$deleted = DB::delete('delete from sessions where user_id = ?', [1]);

DB::statement('drop table temporary_imports');

use Illuminate\Database\Events\QueryExecuted;
use Illuminate\Support\Facades\DB;

public function boot(): void
{
    DB::listen(function (QueryExecuted $query) {
        logger()->debug('SQL executed', [
            'sql' => $query->toRawSql(),
            'time_ms' => $query->time,
        ]);
    });
}

use Illuminate\Support\Facades\DB;

DB::transaction(function () {
    DB::update('update users set votes = 1');
    DB::delete('delete from posts where archived = 1');
});

DB::transaction(function () {
    // ...
}, attempts: 5);

DB::beginTransaction();

try {
    DB::update('update accounts set balance = balance - 100 where id = ?', [1]);
    DB::update('update accounts set balance = balance + 100 where id = ?', [2]);

    DB::commit();
} catch (\Throwable $e) {
    DB::rollBack();
    throw $e;
}