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create table users ( id int, name varchar(64), balance int check(balance > 0) ); insert into users values (1, 'User1', 30);
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<?php $amount = 10; try { $pdo->beginTransaction(); $stmt = $pdo->prepare("select balance from users where id = ?"); $stmt->execute([1]); $row = $stmt->fetch(PDO::FETCH_ASSOC); $balance = $row['balance']; if ($balance>=$amount) { $stmt = $pdo->prepare("update users set balance = balance - ? where id = ?"); $stmt->execute([$amount, 1]); } $pdo->commit(); echo "Transaction commited!"; } catch(PDOException $e) { echo "No money, No honey!"; $pdo->rollBack(); }
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