Re: green bean question on singleton php5

[Jochem Maas <jochem@xxxxxxxxxxxxx>]

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

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