php - 更新时出现SQL错误

Question

当我运行 PHP SQL 代码时，出现以下 SQL 错误:

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 'WHERE useid = 8' at line 1

mysql_query("UPDATE free_ebook SET math = $assign_math WHERE useid = $newuserid;")or die(mysql_error());

math 字段是 int(10)，useid 也是 int(10)。

Answer 1

看起来字段名称可能应该是 userid，而不是 useid。

或者，尝试将值括在单引号中，如下所示:

"UPDATE free_ebook SET math = '".$assign_math."' WHERE useid = '".$newuserid."';"

甚至

"UPDATE free_ebook SET math = '{$assign_math}' WHERE useid = '{$newuserid}';"

<小时/>

关于主题:mysql_query() 已弃用，您应该使用 PDO 扩展。它很容易(也许更容易!)学习并且更安全:

Are there good tutorials on how to use PDO?

http://wiki.hashphp.org/PDO_Tutorial_for_MySQL_Developers

http://net.tutsplus.com/tutorials/php/why-you-should-be-using-phps-pdo-for-database-access/

http://www.phpro.org/tutorials/Introduction-to-PHP-PDO.html