Question

我收到了这些错误：

警告：mysqli_real_escape_string（）要求参数1为mysqli，在第44行的C：\ xxx \ database.php中给出null

警告：mysqli_real_escape_string（）要求参数1为mysqli，在第44行的C：\ xxx \ database.php中给出null

警告：mysqli_query（）期望参数1为mysqli，在第31行的C：\ xxx \ database.php中给出null

我已正确连接数据库连接。当我运行我的文件时，我收到这些错误：

//database.php
<?php

require_once ("config.php");

class MySQLDatabase {

private $connection;

function _construct() {
    $this->open_connection();
}

public function open_connection() {
    $this->connection = mysqli_connect(DB_SERVER, DB_USER, DB_PASS, DB_NAME);
    if (mysqli_connect_errno()) {
        die("Database connection failed:" .
                mysqli_connect_error() .
                "( " . mysqli_connect_errno() . ")"
        );
    } 
}

public function close_connection() {
    if (isset($this->connection)) {
        mysqli_close($this->connnection);
        unset($this->connection);
    }
}

public function query($sql) {
    $result = mysqli_query($this->connection, $sql);        <<line 31
    $this->confirm_query($result);
    return $result;
}

private function confirm_query($result) {
    if (!$result) {
        die("Database query failed.");
    }
}

public function escape_value($string) {

    $escaped_string = mysqli_real_escape_string($this->connection, $string);   <<line 44
    return $escaped_string;
}

}

$database = new MySQLDatabase();
$db =& $database;
?>

运行＆＃39; user.php＆＃39;

public static function authenticate($email="", $password="") {
        global $database;
        $email = $database->escape_value($email);
        $password = $database->escape_value($password);

        /*SQL statements*/
}

＆＃39;的config.php＆＃39;

<?php
// Database Constants
defined('DB_SERVER') ? null : define("DB_SERVER", "localhost:3306");
defined('DB_USER')   ? null : define("DB_USER", "username");
defined('DB_PASS')   ? null : define("DB_PASS", "password");
defined('DB_NAME')   ? null : define("DB_NAME", "databasename");
?>

到底出了什么问题？

在OOP上使用mysqli_real_escape_string时出错

0 个答案: