Re: [PHP] Extending a class with a static constructur (like PEAR::DB)
[EMAIL PROTECTED] wrote:
Ahhh! I'd kept thinking what connect() returned was a db object, but it does
look like
it returns varying objects depending on which database you're using.
correct
Maybe I'd want to extend DB_common instead of DB_mysql, so that the methods
would
be inhereted by any object?
But DB_mysql will not inherit from your object! Look at the source:
class DB_mysql extends DB_common {...}
If you inherit from a class, the parent class will not inherit your (the
child classes) methods. If a class should inherit from your object, it
must explicitly inherit from that class.
Best regards
Andreas
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Re: [PHP] Extending a class with a static constructur (like PEAR::DB)
Chris wrote:
You'll need to:
$dbtoy = new DBToyExt();
$dbtoy-connect()
$dbtoy-testext('testing');
But you cannot do:
$dbtoy = new DBToyExt();
$dbtoy-connect()
$dbtoy-testext('testing');
$result = $dbtoy-query('SELECT...');
//[...]
You have to do something like this:
$dbtoy = new DBToyExt();
$db = $dbtoy-connect()
$dbtoy-testext('testing');
$result = $db-query('SELECT...');
//[...]
If you want to avoid that, you have to write a wrapper around DB.
best regards
Andreas
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Re: [PHP] Extending a class with a static constructur (like PEAR::DB)
[EMAIL PROTECTED] wrote:
So... I'm trying to extend PEAR::DB. It'd be great to keep everything it offers and just add a few more perhaps unconventional functions.
Intuitively, it seemed like this approach might work:
?PHP
require_once(DB.php);
# Toy Extension of DB Class
class DBToyExt extends DB
{
var $foo = 1;
var $bar = 2;
function testext($x)
{
echo \nHEY: $x;
}
}
$dte = DBToyExt::connect(mysql://weston_tssa:[EMAIL
PROTECTED]/weston_tssa);
$dte-testext('testing');
$dte-testext($dte-moo);
$dte-testext($dte-bar);
?
However, it doesn't seem to understand that the method testext exists, and
gives me a fatal error to that effect, as you can see:
$dte will only have the return value of DBToyExt::connect() - it won't
allow you to access other methods in the class.
You'll need to:
$dbtoy = new DBToyExt();
$dbtoy-connect()
$dbtoy-testext('testing');
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Re: [PHP] Extending a class with a static constructur (like PEAR::DB)
Weston wrote:
$dte = DBToyExt::connect(mysql://weston_tssa:[EMAIL
PROTECTED]/weston_tssa);
$dte-testext('testing');
$dte-testext($dte-moo);
$dte-testext($dte-bar);
On Fri, Mar 10, 2006 at 10:43:02AM +1100, Chris wrote:
$dte will only have the return value of DBToyExt::connect() - it won't
allow you to access other methods in the class.
You'll need to:
$dbtoy = new DBToyExt();
$dbtoy-connect()
$dbtoy-testext('testing');
Thanks! Works like a charm:
http://weston.canncentral.org/web_lab/mlib/DBToyExt2.php
That's interesting. I think I just sortof expected that since the canonical
invocation is through a statically called method, calling it by dereferencing
a specific object wouldn't work.
Does anyone know if that would also work in PHP 5?
If not, is there another way to do what I'm trying to do?
Thanks,
Weston
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Re: [PHP] Extending a class with a static constructur (like PEAR::DB)
[EMAIL PROTECTED] wrote:
Weston wrote:
$dte = DBToyExt::connect(mysql://weston_tssa:[EMAIL PROTECTED]/weston_tssa);
$dte-testext('testing');
$dte-testext($dte-moo);
$dte-testext($dte-bar);
$dte will only have the return value of DBToyExt::connect() - it won't
allow you to access other methods in the class.
You'll need to:
$dbtoy = new DBToyExt();
$dbtoy-connect()
$dbtoy-testext('testing');
Thanks! Works like a charm:
http://weston.canncentral.org/web_lab/mlib/DBToyExt2.php
That's interesting. I think I just sortof expected that since the canonical
invocation is through a statically called method, calling it by dereferencing
a specific object wouldn't work.
In your example, $dte holds whatever DBToyExt::connect returns (whether
that's a connection resource, a boolean, a string - doesn't matter).
It's the same as:
function connect() {
return true;
}
$x = connect();
$x will only hold what 'connect' returns.
If you do:
var_dump($dte);
It won't be an object, so you can't use that to reference other methods
in that (or the parent) class(es).
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Re: [PHP] Extending a class with a static constructur (like PEAR::DB)
So... I'm trying to extend PEAR::DB. It'd be great to keep everything it offers and just add a few more perhaps unconventional functions. $dte = DBToyExt::connect(mysql://weston_tssa:[EMAIL PROTECTED]/weston_tssa); DB::connect() is actually a factory call. So what is returned is an instance of (in your case) a DB_mysql object. Ahhh! I'd kept thinking what connect() returned was a db object, but it does look like it returns varying objects depending on which database you're using. Maybe I'd want to extend DB_common instead of DB_mysql, so that the methods would be inhereted by any object? Thanks, Weston -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
