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我正在尝试创建一个页面，用户可以在其中更新他们的信息，例如他们的姓名/电子邮件和密码。下面是更新函数：

        public function update() {
        $correct = false;
        try {
            $con = new PDO( DB_DSN, DB_USERNAME, DB_PASSWORD );
            $con->setAttribute( PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION );
            $sql = "UPDATE users SET `username` = :username, `password` = :password, `name` = :name, `email` = :email WHERE `userID` = :userID";


            $stmt = $con->prepare( $sql );
            $stmt->bindValue( "username", $this->username, PDO::PARAM_STR );
            $stmt->bindValue( "password", hash("sha256", $this->password . $this->salt), PDO::PARAM_STR );
            $stmt->bindValue( "name", $this->name, PDO::PARAM_STR );
            $stmt->bindValue( "email", $this->email, PDO::PARAM_STR );
            $stmt->bindValue( "userID", $this->userID, PDO::PARAM_STR );
            $stmt->execute();

            print("PDO::FETCH_ASSOC: ");
            print("Return next row as an array indexed by column name\n");
            $result = $stmt->fetch(PDO::FETCH_ASSOC);
            print_r($result);
            print("\n");

这是页面上的表格：

<?php
                        echo '<form method="post" action="' . $_SERVER['PHP_SELF'] . '">
                             <ul>
                                     <li>
<label for="usn">Name : </label>
                                             <input type="text" id="usn" maxlength="36" required autofocus name="name" value="' . $row['name'] . '" />
                                             <input type="text" name="userID" value="' . $row['userID'] . '" class="displaynone"/>
                                     </li>
                                     <li>
<label for="usn">Email : </label>
                                             <input type="text" id="usn" maxlength="46" required autofocus name="email" value="' . $row['email'] . '" />
                                     </li>
                                     <li>

                                             <label for="usn">Username : </label>
                                             <input type="text" id="usn" maxlength="30" required autofocus name="username" disabled="disabled" value="' . $row['username'] . '" />
                                     </li>

                                     <li>
                                             <label for="passwd">Password : </label>
                                             <input type="password" id="passwd" maxlength="30" required name="password" />
                                     </li>

                                            <li>
                                             <label for="conpasswd">Confirm Password : </label>
                                             <input type="password" id="conpasswd" maxlength="30" required name="conpassword" />
                                     </li>
                                     <li class="buttons">
                                             <input type="submit" name="update" value="Update" />
                                                    <input type="button" name="cancel" value="Cancel" />
                                     </li>

                             </ul>
                     </form>';                  
$usr = new Users; //create new instance of the class Users
$usr->storeFormValues( $_POST ); //store form values     //if the entered password is match with the confirm password then register him
if( $_POST['password'] == $_POST['conpassword'] ) {
echo $usr->update($_POST); 
} else {
//if not then say that he must enter the same password to the confirm box.
echo "Password and Confirm password not match"; 
}
                    ?>

这将返回以下错误：

PDO::FETCH_ASSOC: Return next row as an array indexed by column name SQLSTATE[HY000]: General error

我真的被困在这里了。我不知道如何进一步解决此问题。

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