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
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