连接php中的2台服务器和数据库类

时间:2016-03-30 11:23:18

标签: php mysql class server connection

我知道如何将2台服务器连接到数据库有答案,但我的情况有点不同,所以不要只是将我重定向到另一个答案。我的联系不是简单的单行,我正在寻找最好的方法(放弃课程,做一些完全不同的事情,一种通过该课程连接2的方法等)。

所以这就是发生的事情。我目前在国外实习,我被分配了一个简单的任务,我必须使用1台服务器,完成所有工作,这似乎是故事的结尾。然而,一旦我们将所有内容都移动到真正的主机上,我发现我有2台服务器来自而不是1台。

这就是我的1服务器连接的样子:

class.database.inc

<?php

require_once(LIB_PATH . "config.php");

class MySQLDatabase {

private $connection;
public $last_query;
private $magic_quotes_active;
private $real_escape_string_exists;

function __construct() {
    $this->open_connection();
    $this->magic_quotes_active = get_magic_quotes_gpc();
    $this->real_escape_string_exists = function_exists("mysql_real_escape_string");
}

public function open_connection() {
    $this->connection = mysqli_connect(SERVER_ADDR, SERVER_USER, SERVER_PWD, SERVER_DB);
    if (mysqli_connect_errno()) {
        printf("Connect failed: %s\n", mysqli_connect_error());
        exit();
    } else {
        $db_select = $this->connection->query("SELECT DATABASE()");
        if (!$db_select) {
            printf("Database selection failed: %s\n", mysqli_connect_error());
            exit();
        }
    }
}

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

public function query($sql) {
    $this->last_query = $sql;
    $result = $this->connection->query($sql);
    $this->confirm_query($result);
    return $result;
}

public function escape_value($value) {
    if ($this->real_escape_string_exists) { // PHP v4.3.0 or higher
        // undo any magic quote effects so mysql_real_escape_string can do the work
        if ($this->magic_quotes_active) {
            $value = stripslashes($value);
        }
        $value = $this->connection->real_escape_string($value);
    } else { // before PHP v4.3.0
        // if magic quotes aren't already on then add slashes manually
        if (!$this->magic_quotes_active) {
            $value = addslashes($value);
        }
        // if magic quotes are active, then the slashes already exist
    }
    return $value;
}

// "database-neutral" methods
public function fetch_array($result_set) {
    return $result_set->fetch_array(MYSQLI_ASSOC);
}

public function num_rows($result_set) {
    return $result_set->num_rows;
}

public function insert_id() {
    // get the last id inserted over the current db connection
    return $this->connection->insert_id;
}

public function affected_rows() {
    return $this->connection->affected_rows;
}

private function confirm_query($result) {
    if (!$result) {
        $output = "Database query failed: " . mysqli_connect_error() . "<br /><br />";
        $output .= "Last SQL query: " . $this->last_query;
        die($output);
    }
}

}

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

在config.php文件中我只有这个(删除了值,它现在仍然有效):

defined("SERVER_ADDR") ? null : define("SERVER_ADDR", );
//MYSQL username
defined("SERVER_USER") ? null : define("SERVER_USER", );
//MYSQL password
defined("SERVER_PWD") ? null : define("SERVER_PWD", );
//MYSQL database name
defined("SERVER_DB") ? null : define("SERVER_DB", );

所以问题是,最好的方法是什么。有没有办法我可以添加另一个“config2.php”类型的文件,并在类中更改一点,使所有这些函数都适用于这两个类,或者我应该做其他事情。

一如既往,感谢我真正感谢他们的答案。

更新

所以这就是我尝试过的,但它没有用。当我运行所需的SQL函数时,它会显示正确的表,但每次都会失败函数确认查询。

    <?php

require_once(LIB_PATH . "config.php");

class MySQLDatabase {

private $connection;
public $last_query;
private $magic_quotes_active;
private $real_escape_string_exists;

public $server;
public $user;
public $pw;
public $database;

function __construct() {
    $this->open_connection();
    $this->magic_quotes_active = get_magic_quotes_gpc();
    $this->real_escape_string_exists = function_exists("mysql_real_escape_string");
}

public function open_connection() {
    $this->connection = mysqli_connect($this->server, $this->user, $this->pw, $this->database);
    if (mysqli_connect_errno()) {
        printf("Connect failed: %s\n", mysqli_connect_error());
        exit();
    } else {
        $db_select = $this->connection->query("SELECT DATABASE()");
        if (!$db_select) {
            printf("Database selection failed: %s\n", mysqli_connect_error());
            exit();
        }
    }
}

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

public function query($sql) {
    $this->last_query = $sql;
    $result = $this->connection->query($sql);
    $this->confirm_query($result);
    return $result;
}

public function escape_value($value) {
    if ($this->real_escape_string_exists) { // PHP v4.3.0 or higher
        // undo any magic quote effects so mysql_real_escape_string can do the work
        if ($this->magic_quotes_active) {
            $value = stripslashes($value);
        }
        $value = $this->connection->real_escape_string($value);
    } else { // before PHP v4.3.0
        // if magic quotes aren't already on then add slashes manually
        if (!$this->magic_quotes_active) {
            $value = addslashes($value);
        }
        // if magic quotes are active, then the slashes already exist
    }
    return $value;
}

// "database-neutral" methods
public function fetch_array($result_set) {
    return $result_set->fetch_array(MYSQLI_ASSOC);
}

public function num_rows($result_set) {
    return $result_set->num_rows;
}

public function insert_id() {
    // get the last id inserted over the current db connection
    return $this->connection->insert_id;
}

public function affected_rows() {
    return $this->connection->affected_rows;
}

private function confirm_query($result) {
    if (!$result) {
        $output = "Database query failed: " . mysqli_connect_error() . "<br /><br />";
        $output .= "Last SQL query: " . $this->last_query;
        die($output);
    }
}

}

$database = new MySQLDatabase();
$database->server = SERVER_ADDR;
$database->user = SERVER_USER;
$database->pw = SERVER_PWD;
$database->database = SERVER_DB;

$db = & $database;

也许一些额外的信息会有所帮助所以这就是我使用1函数从SQL获取数据的地方(它们现在都失败了所以我猜1个例子就足够了)。

users.php:

//more code
 $max_users = User::count_all(); //max users   
//more code

class.database_query.inc:

require_once(LIB_PATH . "class.database.inc");

class DatabaseObject {

    protected static $table_name;

//more functions

//the one in use:
    public static function count_all() {
        global $database;
        $sql = "SELECT COUNT(*) FROM " . static::$table_name;
        $result_set = $database->query($sql);
        $row = $database->fetch_array($result_set);
        return array_shift($row);
    }

//more functions

}

这是我在加载users.php时得到的结果:

“数据库查询失败:

上次SQL查询:SELECT COUNT(*)FROM table_name“ (当我直接在phpmyadmin中输入时,同样的SQL查询有效。)

是的..只要我只使用1台服务器(页面顶部的第一个块),一切正常。

1 个答案:

答案 0 :(得分:1)

为什么依靠define常量语句?您可以编写.ini文件并使用$array = parse_ini_file(filename)读取配置。这样做,您可以使用特定配置的文件名(或更高级的部分名称)来调用构造函数。

因为你在谈论“最好的方法” - 如果你真的需要mysql_real_escape_string(动态$table_name 一个原因,那就没有别的办法了)处理它可能不存在的情况你应该(如果没有)拒绝任何访问或至少提供带有正则表达式的polyfill。 mysqli的{​​{1}}效果更好,请考虑使用mysql。尽可能使用参数化预准备语句来提高安全性。

用于提供静态方法的类的误用是一个过时的概念,因为在较新的PHP版本中,上下文分离可以通过命名空间很好地处理。