julian schreef:
you are forcing the no instantiation via abstract, instead of hiding via
private method constructor.
you want to garantee a single instance of the mysqli object - who cares
exactly how this is done. besides which the whole exercise is bogus. you
want a DB connection abstraction that allows to create connections to
multiple DBs and given a given set of connection parameters to always
return the same connection object ... which is not exactly the same as
a singleton (at all)
given that dbaccess doesn't extend mysqli instantiation of dbaccess is completely
pointless no?
You change the constructor for an init function.
still the $dummy = new dbaccess ()..... looks like a simpler solution....
no idea what you mean, personally I can't see anything complicated in any of these
examples - I couldn't find a post showing something with $dummy.
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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