PDO更新返回成功，但不更新数据库

Question

I'm using PDO to update a column in a table. It runs fine, and execute() returns 1 (success). But, when I check the database the value in the status column hasn't changed.

/*
 * Add jobs to the beanstalkd queue
 */
foreach($jobs as $job) {

    $pheanstalk->useTube('scraper')->put(json_encode([
        'username' => $job['username'],
        'password' => $job['password'],
        'proxy'    => $job['proxy'],
        'gender'   => $job['gender'],
        'age'      => $job['age'],
        'device'   => $job['device']
    ]));

    /*
     * Update the row in the database and change its status to "queued"
     */
    try {
        $sql = "UPDATE cron_jobs SET status = :status WHERE id = :cid";
        $dbh->prepare($sql);
        $sth->bindValue(":status", "queued");
        $sth->bindValue(":cid", $job['cid']);
        print $sth->execute();
    } catch(PDOException $e) {
        syslog(LOG_ERR, $e->getTraceAsString());  
        exit;
    }    
}

Any ideas? It's not reaching the catch block, and no exceptions occur.

Answer 1

Maybe you can use commit.

$dbh->beginTransaction();
//you code
$dbh->commit();

Check PDO docs. :)

Answer 2

Found the error. This:

$dbh->prepare($sql);

Should be:

$sth = $dbh->prepare($sql);

I had another query in the script above, I often reuse variable names. I totally forgot to add the variable. It's always the silly mistakes that catch you out the longest.