[英]Error with a prepared statement with named placeholders in PHP with mySQL
使用此代码,我的网页上出现了这些错误
Notice: Undefined variable: dbh in /home/danu2_cj3/public_html/lists.php on line 14
Fatal error: Call to a member function prepare() on a non-object in /home/danu2_cj3/public_html/lists.php on line 14
这是我正在使用的php代码,第14行是此代码中的第四行
<?php
/* Execute a prepared statement by binding PHP variables */
$member = $_SESSION['SESS_MEMBER_ID'];
$sth = $dbh->prepare('SELECT name
FROM lists
WHERE member_id = :member_id ');
$sth->bindValue(':member_id', $member, PDO::PARAM_INT);
$sth->execute();
?>
我正在尝试显示一堆行的数组,其中这些行中的一个字段应该与登录会话的人的member_id匹配
这是页面的完整代码(top.php和bottom.php只是布局页面)
<?php include ('top.php')?>
<h1>My Profile </h1>
<a href="lists.php">My Lists</a> | <a href="logout.php">Logout</a></br>
</br>
Please select list to view/delete
<?php include ("connect.php")?>
<?php
/* Execute a prepared statement by binding PHP variables */
$member = $_SESSION['SESS_MEMBER_ID'];
$sth = $dbh->prepare('SELECT name
FROM lists
WHERE member_id = :member_id ');
$sth->bindValue(':member_id', $member, PDO::PARAM_INT);
$sth->execute();
?>
<?php include ('bottom.php')?>
这是我的connect.php文件
<?php
$username = "mydb";
$password = "mydb";
$hostname = "host";
//connection to the database
$dbh = mysql_connect($hostname, $username, $password)
or die("Unable to connect to database");
//select a database to work with
$selected = mysql_select_db("mydb",$dbh)
or die("Could not select database");
?>
您可能应该将connection
添加到数据库或检查connect.php
connection
设置是否正确
try
{
$dbh = new PDO($dsn, $user, $password);
}
catch (PDOException $e)
{
echo 'Connection failed: ' . $e->getMessage();
}
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