这是我做的一个快速类，应该允许你使用adoDB连接到3个数据库：

This is a quick class that I made that should allow you to connect to 3 databases using adoDB:

class Data {
    private static $_dbOne = null;
    private static $_dbTwo = null;
    private static $_dbThree = null;

    protected function __construct() {
    }

    /**
     * This function returns the database connection object
     * @return Object Database Connection
     */
    public static function dbOne() {
        include_once(LIBRARY_PATH.'adodb5/adodb.inc.php');
        if (null === self::$_dbOne) {


            $_connOne = 'mysql://username:password@www.server.com/database';

            self::$_dbOne = &ADONewConnection($_connOne);
            if (self::$_dbOne==false) { die('Could not connect to the database.'); }

        }

        return self::$_dbOne;
    }

    /**
     * This function returns the database connection object
     * @return Object Database Connection
     */
    public static function dbTwo() {
        include_once(LIBRARY_PATH.'adodb5/adodb.inc.php');
        if (null === self::$_dbTwo) {


            $_connTwo = 'mysql://username:password@www.server.com/database';

            self::$_dbTwo = &ADONewConnection($_connTwo);
            if (self::$_dbTwo==false) { die('Could not connect to the database.'); }

        }

        return self::$_dbTwo;
    }

}

    /**
     * This function returns the database connection object
     * @return Object Database Connection
     */
    public static function dbThree() {
        include_once(LIBRARY_PATH.'adodb5/adodb.inc.php');
        if (null === self::$_dbThree) {


            $_connThree = 'mysql://username:password@www.server.com/database';

            self::$_dbThree = &ADONewConnection($_connThree);
            if (self::$_dbThree==false) { die('Could not connect to the database.'); }

        }

        return self::$_dbThree;
    }

}

将使用此类：

$sql = "SELECT * FROM *";
$results1 = Data::dbOne()->Execute($sql);
$results2 = Data::dbTwo()->Execute($sql);
$results3 = Data::dbThree()->Execute($sql);