Question

该脚本可以将用户数据添加到数据库中，但我想检查用户名是否正在使用但是仍然遇到此错误

Fatal error: Call to a member function rowcount() on a non-object in /home/4507408/public_html/registeruser.php on line 78

我似乎无法用PDO做到这一点，任何帮助都会很棒！

<?php
                $form = $_POST;
                $username = $form[ 'username' ];
                $password = $form[ 'password' ];
                $firstname = $form[ 'firstname' ];
                $location = $form[ 'location' ];
                $age = $form[ 'age' ];
                $email = $form[ 'email' ];

                $usercheck = $_POST['username'];

                 $check = "SELECT username FROM use WHERE username = '$usercheck'";
                 $query = $DBH->prepare( $check );
                 $query = $DBH->prepare($check);
                 $query->execute();
                 $data = $query->fetchALL();

                 $check2 = $check->rowcount();



                 //if the name exists it gives an error

                 if ($check2 != 0) {

                        die('Sorry, the username '.$_POST['username'].' is already in use.');

                                }

                $sql = "INSERT INTO user ( username, password, firstname, location, age, email ) VALUES ( :username, :password, :firstname, :location, :age, :email )";

                $query = $DBH->prepare( $sql );

                ?>

Answer 1

这一行：

$check = "SELECT username FROM use WHERE username = '$usercheck'";

错了。 use是SQL保留字。我假设你的意思是user。使用简单的变量替换将值注入查询字符串也是一个可怕的想法。 PDO的重点是使用参数化查询：http://us1.php.net/pdo.prepared-statements

检查数据库pdo的用户名

1 个答案: