WHERE子句与PDO混淆

Question

当您需要将一个值同时与几个列匹配时，我在理解如何使用预准备语句时遇到了一些麻烦。

换句话说什么，而不是这样做：

$stmt = $dbh->prepare("SELECT * FROM REGISTRY where name = ?"); 
$stmt->bindParam(1, $name); 

我想做到这一点： '？'

$stmt = $dbh->prepare("SELECT * FROM REGISTRY where firstname = ? or lastname = ?"); 

既代表相同的字符串。

Answer 1

尝试...

$stmt = $dbh->prepare("SELECT * FROM registry WHERE firstname = :name OR lastname = :name;"); 
$stmt->bindParam(':name', $name); 

Answer 2

为什么不直接使用一个命名参数：

$stmt = $dbh->prepare("SELECT * FROM REGISTRY WHERE firstname = :name OR lastname = :name"); 
$stmt->bindParam(':name', $name); 

Answer 3

$stmt = $dbh->prepare("SELECT * FROM registry WHERE firstname = ? 
OR lastname = ? ;"); 
$stmt->bindParam(1, $name);