PDO 上 bind_result 的等价物是什么
我正在使用准备好的语句转换为 PDO 和我，我想绑定我的结果 $stmt->bind_result($email_count); 所以我可以把它放到一个if 语句查看电子邮件是否存在但是我收到错误 Fatal error: Call to undefined method PDOStatement::bind_result() in/Applications/XAMPP/xamppfiles/htdocs/imanage/insert.php on line 51 与前面的示例相关.
I'm converting to PDO and Im using prepared statements, I want to bind my result as so $stmt->bind_result($email_count); so i am able to put this into an if statement to see if the e-mail exists however I am getting the error Fatal error: Call to undefined method PDOStatement::bind_result() in /Applications/XAMPP/xamppfiles/htdocs/imanage/insert.php on line 51 which relates to the previous example.
我猜 bind_result 不是 PDO 定义的方法，所以有我可以使用的等效方法吗?
I'm guessing bind_result is not a PDO defined method, so is there an equivalent I could use?
我的代码如下，以防万一:
My code is below in case it helps:
插入.php
<?php
include("connect/class.Database.php");
class Users extends Database {
public function insert() {
$stmt = $this->pdo->prepare("SELECT COUNT(*) FROM users WHERE email=:email");
$stmt->bindParam(":email", $_POST['email']);
$stmt->bind_result($email_count);
$stmt->execute();
$stmt->fetch(PDO::FETCH_ASSOC);
if ($email_count > 0) {
echo "email exisits! click here to try <a href='register'>again</a>";
} else {
//escape the POST data for added protection
$username = isset($_POST['username']) ? $_POST['username'] : null;
$cryptedPassword = crypt($_POST['password']);
$password = $cryptedPassword;
$name = isset($_POST['name']) ? $_POST['name'] : null;
$email = isset($_POST['email']) ? $_POST['email'] : null;
$data = array($username, $password, $name, $email);
$stmta = $this->pdo->prepare("INSERT INTO users (username, password, name, email) VALUES (?, ?, ?, ?)");
$stmta->execute($data);
printf("%d Row inserted.
", $stmta->row_count);
/* close statement and connection */
$stmta->close();
} // end email_count and insert to table
} // end function
}
?>
connect/class.Database.php
connect/class.Database.php
<?php
// Database connection PDO
class Database {
public function __construct() {
// Connection information
$host = 'localhost';
$dbname = 'imanage';
$user = 'root';
$pass = '';
// Attempt DB connection
try
{
$this->pdo = new PDO("mysql:host=$host;dbname=$dbname", $user, $pass);
$this->pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
echo 'Successfully connected to the database!';
}
catch(PDOException $e)
{
echo $e->getMessage();
}
}
public function __destruct()
{
// Disconnect from DB
$this->pdo = null;
echo 'Successfully disconnected from the database!';
}
}
?>
推荐答案
PDO 根本不需要丑陋的 bind_result.
然而你也不需要数数.请避免不必要的操作 - 它们只会无缘无故地膨胀和混淆您的代码.
You do not need an ugly bind_result with PDO at all.
Yet you don't need to count either. Please, avoid unnecessary actions - they only bloat and obfuscate your code for no reason.
首先想想，你需要从查询中得到什么?你真的需要数数吗?不.你真正需要的只是一个标志 - 如果用户存在或不存在.因此，进行查询以返回这样的标志.
Think first, what you need from the query? Do you really need to count? No. What you actually need is just a flag - if user exists or no. So, make a query to return such a flag.
$stmt = $this->pdo->prepare("SELECT 1 FROM users WHERE email=?");
$stmt->execute(array($_POST['email']));
$exists = $stmt->fetchColumn();
代码的所有其他部分也是如此
Same goes for all the other parts of code
//escape the POST data for added protection
你实际上并没有逃避"此代码块中的任何数据且不添加任何保护.然而，我认为将 NULL 作为电子邮件插入绝对没有意义.你确定你真的想要吗?
You don't actually "escape" any data in this code block and add no protection. Yet I see absolutely no point in inserting NULL as email. Are you sure you really want it?
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