php mySQL准备续集，只显示与登录用户的用户ID相关联的结果

Question

<?php
require_once 'connection.php';

$p_sql = "SELECT *
    FROM pq_posts p
    JOIN pq_users u ON p.userId = u.userId
    JOIN pq_user_profiles up ON p.userId = up.userId
    WHERE userId = :userId
    ORDER BY timestamp DESC ";

$stmt = $dbConn -> prepare($p_sql);
$stmt->execute( array (":userId" => $_SESSION['userName']));
$posts = $stmt->fetchAll();
?>

注意: 我想显示来自数据库的结果，只有帖子(pq_posts)来自当前使用“userId”登录的用户。这是因为我正在为“管理员主页”创建一个页面......

我收到此错误:

Fatal error: Uncaught exception 'PDOException' with message 'SQLSTATE[23000]: Integrity constraint violation: 1052 Column 'userId' in where clause is ambiguous' in /home/CLASSES/natovmatiej/CST336/final_project/admin_postquotes.php:50 Stack trace: #0 /home/CLASSES/natovmatiej/CST336/final_project/admin_postquotes.php(50): PDOStatement->execute(Array) #1 {main} thrown in /home/CLASSES/natovmatiej/CST336/final_project/admin_postquotes.php on line 50

第 50 行:

$stmt->execute( array (":userId" => $_SESSION['userName']));

谢谢。

Answer 1

我想问题是在 WHERE 子句中你写了 userId，但是你应该像 p.userId 或 那样指定表>u.userId :

$p_sql = "SELECT
          FROM pq_posts p
          JOIN pq_users u ON p.userId = u.userId
          JOIN pq_user_profiles up ON p.userId = up.userId
          WHERE p.userId = :userId
          ORDER BY timestamp DESC ";