如何读取fetch(PDO :: FETCH_ASSOC); [英] How to read fetch(PDO::FETCH_ASSOC);
问题描述
我正在尝试使用PHP构建Web应用程序,并且正在使用memcached从数据库存储用户数据.
I am trying to build a web application using PHP and I am using memcached for storing user data from the DB.
例如,假设我有以下代码:
For example lets say that I have this code:
$sql = "SELECT * FROM users WHERE user_id = :user_id";
$stmt = $this->_db->prepare($sql);
$result = $stmt->execute(array(":user_id" => $user_id));
$user = $stmt->fetch(PDO::FETCH_ASSOC);
我不太确定如何读取$user
变量并从中获取数据.我将需要能够阅读电子邮件和密码"列.
I am not really sure how to read the $user
variable and get the data out of it. I will need to be able to read the email and password column.
我希望有人可以向我解释这是如何工作的.
I was hoping that someone could explain to me how this works.
谢谢
推荐答案
PDOStatement :: fetch 从结果集中返回一行.参数 PDO::FETCH_ASSOC
告诉PDO返回结果作为关联数组.
PDOStatement::fetch returns a row from the result set. The parameter PDO::FETCH_ASSOC
tells PDO to return the result as an associative array.
数组键将与您的列名匹配.如果您的表包含列"email"和"password",则数组的结构如下:
The array keys will match your column names. If your table contains columns 'email' and 'password', the array will be structured like:
Array
(
[email] => 'youremail@yourhost.com'
[password] => 'yourpassword'
)
要从电子邮件"列中读取数据,请执行以下操作:
To read data from the 'email' column, do:
$user['email'];
和密码":
$user['password'];
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