DB::beginTransaction(); try { $project = Project::find($id); $project->users()->detach(); $project->delete(); DB::commit(); } catch (\Exception $ex) { DB::rollback(); return response()->json(['error' => $ex->getMessage()], 500); }

DB::beginTransaction();
try { DB::insert(...); DB::insert(...); DB::insert(...); DB::commit(); // all good
} catch (\Exception $e) { DB::rollback(); // something went wrong
}

use Exception;
DB::beginTransaction();
try {	//your code; DB::commit();
} catch (Exception $e) { DB::rollBack(); dd($e->getMessage());
}
//-----------or----------
try {	return DB::transaction(function () {	//your code;	return back(); });
} catch (Exception $e) {	return $e->getMessage();
}
//note: I prefer the first one.

DB::beginTransaction();
try{ DB::Commit();
} catch (Exception $e) { DB::rollback();
}

use Illuminate\Support\Facades\DB;
DB::transaction(function () { DB::update('update users set votes = 1'); DB::delete('delete from posts');
});

DB::transaction(function()
{ $newAcct = Account::create([ 'accountname' => Input::get('accountname') ]); $newUser = User::create([ 'username' => Input::get('username'), 'account_id' => $newAcct->id, ]);
});

// Start transaction!
DB::beginTransaction();
try { // Validate, then create if valid $newAcct = Account::create( ['accountname' => Input::get('accountname')] );
} catch(ValidationException $e)
{ // Rollback and then redirect // back to form with errors DB::rollback(); return Redirect::to('/form') ->withErrors( $e->getErrors() ) ->withInput();
} catch(\Exception $e)
{ DB::rollback(); throw $e;
}
try { // Validate, then create if valid $newUser = User::create([ 'username' => Input::get('username'), 'account_id' => $newAcct->id ]);
} catch(ValidationException $e)
{ // Rollback and then redirect // back to form with errors DB::rollback(); return Redirect::to('/form') ->withErrors( $e->getErrors() ) ->withInput();
} catch(\Exception $e)
{ DB::rollback(); throw $e;
}
// If we reach here, then
// data is valid and working.
// Commit the queries!
DB::commit();

DB::beginTransaction();
try { DB::insert(...); DB::commit();
} catch (\Exception $e) { DB::rollback(); throw $e;
} catch (\Throwable $e) { DB::rollback(); throw $e;
}

DB::beginTransaction();
try { /** Statement */ DB::commit(); }
catch (\Exception $e) { /** Statement if failed */ DB::rollback(); }

// Start transaction
beginTransaction();
// Run Queries
$acct = createAccount();
$user = createUser();
// If there's an error
// or queries don't do their job,
// rollback!
if( !$acct || !$user )
{ rollbackTransaction();
} else { // Else commit the queries commitTransaction();
}