PHP秒杀系统中的分库分表和分布式事务处理方法

<?php
// 连接数据库
$pdo = new PDO('mysql:host=localhost;dbname=test', 'root', 'password');

// 添加参与者反馈准备就绪状态的函数
function prepare($pdo, $transaction_id, $participant_id) {
    $stmt = $pdo->prepare('INSERT INTO participants(transaction_id, participant_id, status) VALUES(?, ?, 'ready')');
    $stmt->execute([$transaction_id, $participant_id]);
}

// 提交事务的函数
function commit($pdo, $transaction_id) {
    $stmt = $pdo->prepare('UPDATE participants SET status='commit' WHERE transaction_id=?');
    $stmt->execute([$transaction_id]);
}

// 终止事务的函数
function abort($pdo, $transaction_id) {
    $stmt = $pdo->prepare('UPDATE participants SET status='abort' WHERE transaction_id=?');
    $stmt->execute([$transaction_id]);
}

// 检查参与者状态的函数
function checkParticipants($pdo, $transaction_id) {
    $stmt = $pdo->prepare('SELECT COUNT(*) FROM participants WHERE transaction_id=? AND status='ready'');
    $stmt->execute([$transaction_id]);
    $count = $stmt->fetchColumn();
    return $count === 0;
}

// 两阶段提交过程
function twoPhaseCommit($pdo, $transaction_id) {
    // 投票阶段
    $stmt = $pdo->prepare('SELECT participant_id FROM participants WHERE transaction_id=?');
    $stmt->execute([$transaction_id]);
    while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) {
        sendVoteRequest($row['participant_id']);
    }

    // 执行阶段
    if (checkParticipants($pdo, $transaction_id)) {
        sendCommit($transaction_id);
        commit($pdo, $transaction_id);
    } else {
        sendAbort($transaction_id);
        abort($pdo, $transaction_id);
    }
}

?>