如何纠正“SQLSTATE [42000]：语法错误或访问冲突：1064”错误

Question

伙计们，我正在尝试在这里创建一个类似于 facebook 的提要的提要，但我收到了这个错误，我无法弄清楚我哪里出错了。 这是代码：

$sql3="select u.update_id, u.update_body,u.account_name,u.os_id,u.author,u.time,u.title,"
            . "c.comment_body, c.os_id,c.author,c.time"
            . "from updates as u, comment_update as c "
            . "where c.os_id=u.update_id and u.account_name = ':session' and u.type in ('a','c') and u.account_name=':friend' and u.type =('a'|'c') order by u.time asc,c.time desc";
     $stmth=$conn->prepare($sql3);
   $stmth->execute(array(":session"=>$_SESSION['uname'],":friend"=>$friend));
    $status_reply= $stmth->fetchAll(PDO::FETCH_ASSOC);

这是错误代码：-

致命错误：未捕获异常 'PDOException' 并带有消息 'SQLSTATE[42000]：语法错误或访问冲突：1064 您的 SQL 语法有错误；检查与您的 MySQL 服务器版本相对应的手册以获取正确的语法，以便在 /opt/lampp 中的 'as u, comment_update as c where c.os_id=u.update_id and u.account_name = ':sessi' at line 1' 附近使用/htdocs/project-chg/status&cmets.php:28 堆栈跟踪：#0 /opt/lampp/htdocs/project-chg/status&cmets.php(28): PDOStatement->execute(Array) #1 /opt/lampp/htdocs /project-chg/example1.php(30): include('/opt/lampp/htdo...') #2 {main} 在第 28 行的 /opt/lampp/htdocs/project-chg/status&cmets.php 中抛出

任何帮助将不胜感激。

Answer 1

您的代码：

$sql3="select u.update_id, u.update_body,u.account_name,u.os_id,u.author,u.time,u.title,"
            . "c.comment_body, c.os_id,c.author,c.time"
            . "from updates as u, comment_update as c "
            . "where c.os_id=u.update_id and u.account_name = ':session' and u.type in ('a','c') and u.account_name=':friend' and u.type =('a'|'c') order by u.time asc,c.time desc";

1. 在from前加空格

2. 将('a'|'c')更改为('a','c')

3. 考虑使用JOIN 语法代替逗号语法

4. 可能您需要删除:friend 和:session 周围的'

5. 整个WHERE clause conditions对我来说很奇怪u.account_name = :session and u.account_name=:friend同一列？？？ + 加倍u.type 条件

结果：

$sql3="select u.update_id, u.update_body,u.account_name,u.os_id,u.author,u.time,u.title,"
            . "c.comment_body, c.os_id,c.author,c.time"
            . " from updates as u JOIN comment_update as c ON c.os_id=u.update_id "
            . "where u.account_name = :session and u.type in ('a','c') and u.account_name=:friend and u.type =('a','c') order by u.time asc,c.time desc";