使用bindParam PDO执行（）错误

Question

我找不到这个代码失败的地方

 $username = $_POST["UserID"];
 $password = $_POST["PWD"];
 $sql = 'select COUNT(*) from Staff where UserID = :UserID and PWD = :PWD';
 $result = $cnnEmployee->prepare($sql);
 $result->bindParam(':UsedID',$username, PDO::PARAM_STR)
 $result->bindParam(':PWD',$password, PDO::PARAM_STR)
 $result->execute(); //Error here: Fatal error: Uncaught exception 'PDOException' with message 'SQLSTATE[HY093]: Invalid parameter number: parameter was not defined'

但如果我改为

 $username = $_POST["UserID"];
 $password = $_POST["PWD"];
 $sql = 'select COUNT(*) from Staff where UserID = :UserID and PWD = :PWD';
 $result = $cnnEmployee->prepare($sql);
 $result->execute(array(':UserID'=>$username, ':PWD'=>$password));

它工作正常 请帮我找出问题所在。

Answer 1

当您使用:UsedID绑定参数时，查询中的占位符正在查找:UserID