Fatal error: Uncaught exception 'PDOException' with message 'SQLSTATE[42000]:

Question

I have a query where I am counting rows but it's showing this error..

Fatal error: Uncaught exception 'PDOException' with message 'SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'from=? AND to=?' at line 1' in C:\\wamp\\www\\network\\profile.php on line 38

( ! ) PDOException: SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'from=? AND to=?' at line 1 in C:\\wamp\\www\\network\\profile.php on line 38

Here's my code :

$sql_check_friend = "SELECT COUNT(*) FROM connection_request WHERE from=:me AND"; 
$sql_check_friend .= "to=:friend";
    
$sth = $db->prepare($sql_check_friend);
$sth->bindParam(":me", $me);
$sth->bindParam(":friend", $pageuserid);
$sth->execute();

$count = $sth->fetchColumn();

if($count > 0){
echo "REQUEST SENT";
}else{
echo "NOT SENT";
}

I can't figure out what's wrong..

Answer 1

from is a reserved word . It must be escaped in your query:

 SELECT ... WHERE `from` := ...
                  ^--  ^--- 

And ditto for to as well - it's a reserved word too.

Answer 2

这是因为您的字符串/文本连接可能包含这样的引号： " 、 '或` 。尝试删除这些引号然后执行查询，因此验证您的连接字符串。