Re: green bean question on singleton php5

From:	julian	Date:	Wed, 16 Jan 2008 19:53:51 +0000
Subject:	Re: green bean question on singleton php5
References:	1 2	Groups:	php.general
Request:	Send a blank email to php-general+get-267435@lists.php.net to get a copy of this message

you are forcing the no instantiation via abstract, instead of hiding via private method constructor. You change the constructor for an init function. still the $dummy = new dbaccess ()..... looks like a simpler solution.... Thanks for your comments Jochem Maas wrote:

julian schreef:
Hi, I am implementing this
try comparing this rewrite with your version: abstract class dbaccess { static $db = null; private static function init() {
    if (dbaccess::$db))
    return;
    dbaccess::$db = new mysqli("localhost",USER,PASSWD,DB);
    if(mysqli_connect_errno())        throw new Exception('cannot connect to DB');
} public static function getDB() {
    self::init();
    return dbaccess::$db;
} } try {
    $db = dbaccess::getDB();
    $db->query("SELECT foo FROM bar WHERE qux=1");
} catch (Exception) {
    die($e->getMessage());
}
class dbaccess{ static $db=null; static $othervar=33;
      private  function dbaccess(){
    dbaccess::$db= new mysqli("localhost",USER,PASSWD,DB);
    if(mysqli_connect_errno()){
      echo "no way";
    }
}
    public static function GetDb(){
if(dbaccess::$db==null){
dbaccess is a static class, you should not be constructing it here it!
dbaccess::$db= new dbaccess(); } return dbaccess::$db;
      }
} $db=dbaccess::GetDE(); $db->query(..................); will fail...with Call to undefined method dbaccess::query() apparently $db is of type dbaccess... and thus has not does not have query implemented.... any hhelp appreciated..... JCG