Laravel PostgreSQL Transaction Rollback Fix: Quick Steps

In a Laravel 11 app backed by PostgreSQL 16, you might see data silently disappear after a DB::transaction block. The transaction rolls back without throwing an exception, leaving API callers with empty responses. This article walks through the laravel postgresql transaction rollback fix you can apply in minutes.

TL;DR / Quick Summary

• Enable query logging to see what PostgreSQL actually does.

• Set default_transaction_isolation to read committed in your Docker‑Postgres service.

• Replace Laravel's default DB::transaction wrapper with a version that re‑throws PDOException on serialization failures.

• Run the provided PHPUnit test to confirm the fix.

Reproducing the Silent Rollback

When the bug appears, the code looks fine:

// app/Http/Controllers/OrderController.php
public function store(Request $request)
{
    DB::transaction(function () use ($request) {
        Order::create($request->only(['user_id', 'total']));
        // Some external API call that may fail silently
        $this->chargeCustomer($request->user(), $request->total);
    });

    return response()->json(['status' => 'ok']);
}

Run the following test to see the problem in action:

// tests/Feature/TransactionRollbackTest.php
use Illuminate\Support\Facades\DB;
use Tests\TestCase;

class TransactionRollbackTest extends TestCase
{
    public function test_silent_rollback()
    {
        DB::beginTransaction();
        DB::table('orders')->insert(['user_id' => 1, 'total' => 100]);
        // Force a serialization error by setting isolation to SERIALIZABLE
        DB::statement('SET TRANSACTION ISOLATION LEVEL SERIALIZABLE');
        DB::commit();

        $this->assertDatabaseMissing('orders', ['user_id' => 1]); // Fails silently
    }
}

The test passes, but the row never lands in the table. PostgreSQL rolled back the transaction because the isolation level triggered a serialization failure, yet Laravel swallowed the exception.

Enabling Query Logging

Seeing the hidden rollback is the first step. Add the following to config/database.php under the pgsql connection:

// config/database.php
'pgsql' => [
    // ... existing keys ...
    'logging' => true, // custom flag, not built‑in
    'options' => extension_loaded('pdo_pgsql') ? [
        PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
        PDO::ATTR_EMULATE_PREPARES => false,
    ] : [],
],

Then, in AppServiceProvider register a listener:

// app/Providers/AppServiceProvider.php
use Illuminate\Support\Facades\DB;
use Illuminate\Support\ServiceProvider;

public function boot()
{
    DB::listen(function ($query) {
        if (app()->environment('local')) {
            logger()->debug('[SQL] '.$query->sql, $query->bindings);
        }
    });
}

Run the failing test again and check storage/logs/laravel.log. You’ll see a line like:

[SQL] SET TRANSACTION ISOLATION LEVEL SERIALIZABLE
[SQL] COMMIT

PostgreSQL silently rolled back the transaction after the COMMIT because the isolation level caused a serialization error.

Understanding PostgreSQL Isolation Levels

PostgreSQL supports four levels:

Laravel’s DB::transaction does not automatically retry on SQLSTATE 40001 (serialization failure). When you force SERIALIZABLE, PostgreSQL aborts the transaction and returns that error code. Laravel catches the exception, rolls back, and then returns null from the closure – which looks like a silent rollback.

Adjusting PostgreSQL Settings

The simplest production fix is to keep the default isolation level (READ COMMITTED). If you need a stricter level, add retry logic yourself.

If you run PostgreSQL in Docker, edit docker-compose.yml:

# docker-compose.yml
services:
  db:
    image: postgres:16-alpine
    environment:
      POSTGRES_USER: laravel
      POSTGRES_PASSWORD: secret
      POSTGRES_DB: laravel
    command: ["postgres", "-c", "default_transaction_isolation=read committed"]
    ports:
      - "5432:5432"

Re‑create the container (docker compose up -d --force-recreate db). Now new connections inherit the safe isolation level.

Patching Laravel's Transaction Wrapper

If you must stay on SERIALIZABLE, wrap the transaction in a retry loop. Create a helper in app/Support/Transactional.php:

// app/Support/Transactional.php
namespace App\Support;

use Closure;
use Illuminate\Support\Facades\DB;
use PDOException;

class Transactional
{
    public static function run(Closure $callback, int $attempts = 3)
    {
        $tries = 0;
        beginning:
        try {
            return DB::transaction($callback);
        } catch (PDOException $e) {
            // 40001 = serialization_failure
            if ($e->getCode() === '40001' && $tries < $attempts) {
                $tries++;
                // small back‑off
                usleep(100000 * $tries);
                goto beginning;
            }
            // re‑throw for all other errors
            throw $e;
        }
    }
}

Replace the original call:

use App\Support\Transactional;

Transactional::run(function () use ($request) {
    Order::create($request->only(['user_id', 'total']));
    $this->chargeCustomer($request->user(), $request->total);
});

Now a serialization failure triggers a retry, and if it finally succeeds the row persists.

Deploying the Fix

1. Pull the latest code.

Common Pitfalls & Troubleshooting

• Forgot to clear config cache – old connection settings keep the old isolation level. Run php artisan config:clear.

• Using DB::beginTransaction() manually – the custom wrapper only patches DB::transaction. Wrap manual calls with the same retry logic or avoid them.

• Queue workers still use old env – restart php artisan queue:work after changing the Docker command.

• Error code mismatch – PostgreSQL returns 40001 for serialization failures, but some drivers surface it as SQLSTATE[40001]. Check $e->getCode() vs $e->errorInfo[0] if retries never fire.

FAQ

• Why does Laravel swallow the exception on a serialization failure? Laravel catches any Throwable inside the transaction closure, rolls back, and returns null. It doesn’t re‑throw the original PDOException, so the caller never sees the error.

• Can I set the isolation level per transaction instead of globally? Yes. Call DB::statement('SET TRANSACTION ISOLATION LEVEL SERIALIZABLE') at the start of the closure, but you still need the retry wrapper to handle aborts.

• Is the retry loop safe for idempotent operations? Only if the code inside the transaction is idempotent. For external API calls, move them outside the transaction or make them retry‑aware.

• Do I need to change anything in phpunit.xml? No, but ensure the test database uses the same Docker image so the isolation level change is reflected.

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💬 What's your setup? How do you handle PostgreSQL serialization failures in your Laravel queues—do you rely on Laravel's default transaction handling or a custom retry wrapper? Share your thoughts and join the discussion below!

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