php - PDO：bindParam 令牌语法问题答案

【问题标题】：php - PDO: bindParam token syntax issuephp - PDO：bindParam 令牌语法问题
【发布时间】：2012-08-05 14:06:14
【问题描述】：

这个错误有解决办法吗？是否因为查询中的 mySQL 时间格式而发生？

SQL 错误错误：SQLSTATE[HY093]：无效的参数号：绑定变量的数量与令牌数量不匹配大批 ( [:service_user_id] => 90 [:week_beginning] => 2012-08-06 [:week_ending] => 2012-08-12 ) 回溯：C:\wamp\www\Sitetest_9.6.12\public_html\main\ajax\timetable_grid_load.php 在第 45 行

这是使用php-pdo-wrapper-class的PHP：

$bind = array(
    ":service_user_id" =>  $service_user_id,
    ":week_beginning" => $week_beginning,
    ":week_ending" => $week_ending,
);


$query = "SELECT 
    id AS sessID,
    session_day as sessDay,
    session_type_id,
    provider_id,
    description,
    TIME_FORMAT(start_time, '%H:%i') as start_time,
    TIME_FORMAT(finish_time, '%H:%i') as finish_time,
    start_date,
    finish_date,
    (SELECT absence FROM attendance WHERE sessID = session_id AND absence_date = DATE_ADD(':week_beginning', INTERVAL sessDay-1 DAY)) AS attendance
    FROM
    sessions
    WHERE
    service_user_id = :service_user_id AND
    start_date <= ':week_ending' AND
    (finish_date >= ':week_beginning' OR
    finish_date IS NULL OR 
    finish_date=0)
    ORDER BY session_day ASC";      

$result= $db->run($query,$bind);
return $result;

【问题讨论】：

标签： php mysql pdo

【解决方案1】：

不要在准备好的语句中使用单引号来分隔参数。没有必要（这就是首先准备好语句的全部意义）。

    ...
WHERE
    service_user_id = :service_user_id AND
    start_date <= :week_ending AND
    (finish_date >= :week_beginning OR
    finish_date IS NULL OR 
    ...

提示：start_date <= ':week_ending' 转换为 less than or equal to the literal string ":week_ending"。

【讨论】：