PDO连接数据库从SQLITE改为MYSQL的有关问题

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Release: 2016-06-13 13:09:27
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PDO连接数据库从SQLITE改为MYSQL的问题
请教一下
之前写了个小代码 用PDO连接SQLITE 一切正常
现在改为连接MYSQL 报错
Fatal error: Call to a member function fetch() on a non-object
提示没有fetch方法 该如何解决?

对应行代码:
$sql ="select * from url where long = '$_POST[url]'"; //查询网址是否已经在数据库中
$query = $db -> query($sql);
$row = $query -> fetch();

------解决方案--------------------
$sql ="select * from url where `long` = '$_POST[url]'";

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