You are viewing a plain text version of this content. The canonical link for it is here.
Posted to user@commons.apache.org by Jochen Bedersdorfer <be...@xtramind.com> on 2004/01/02 10:59:55 UTC
[JXPath] Verbose mode?
Hi there,
is there a verbose mode somewhere hidden inside JXPath?
I have trouble with the XPath expressions I am using.
Being able to track the search process of XPath would really be helpful.
Thanks for the help,
Jochen
--
Jochen Bedersdorfer
Senior Software Architect
XtraMind Technologies GmbH
Stuhlsatzenhausweg 3
D-66123 Saarbruecken
Phone: +49 (681) 302 5100
Fax: +49 (681) 302 5109
beders@xtramind.com
www.xtramind.com
---------------------------------------------------------------------
To unsubscribe, e-mail: commons-user-unsubscribe@jakarta.apache.org
For additional commands, e-mail: commons-user-help@jakarta.apache.org
Re: [JXPath] Plans for JNDI, JMX and Filesystems?
Posted by Brian McCallister <mc...@forthillcompany.com>.
You may be right. An important thing to keep in mind in O/R mapping,
though, is that you very rarely need to do a join in the query (I have
yet to have to do one in six+ projects I have worked on using OJB) as
most joins are mapped as properties (collections) on other objects.
Hierarchical semantics make a lot of sense when querying into what is,
to the client, just an object graph.
-Brian
On Jan 3, 2004, at 2:44 PM, Dmitri Plotnikov wrote:
> In my opinion, XPath is much too weak of a query language for
> relational
> databases. What you want is something like XQuery, which is a superset
> of
> XPath that includes relational semantics a la SQL.
>
> I wonder if there is an open source project similar to JXPath, but with
> XQuery as the base language. I looked at the SourceForge project
> called
> JXQuery. Very interesting, but it does not appear to have ambitions
> beyond
> XML applications. Did I misunderstand?
>
> Mapping of XPath semantics to Java objects is a highly contraversial
> issue -
> when I was building JXPath I had to make many decisions on that front
> that I
> myself was not very comfortable with. I can only imagine the
> magnitude of
> this problem if we try to map XQuery to arbitrary object models. Can
> anybody see an easy solution there?
>
> - Dmitri
>
>
> ----- Original Message -----
> From: "Brian McCallister" <mc...@forthillcompany.com>
> To: "Jakarta Commons Users List" <co...@jakarta.apache.org>
> Sent: Friday, January 02, 2004 11:15 PM
> Subject: Re: [JXPath] Plans for JNDI, JMX and Filesystems?
>
>
>> I don't know about these, but I am trying to talk any of the JXPathers
>> into helping put together the ability to query persistent object
>> models
>> via OJB (which will mean building OJB queries from JXPath AST's or
>> something)...
>>
>> -Brian
>>
>> On Jan 2, 2004, at 3:49 PM, Michael Nascimento Santos wrote:
>>
>>> Hey,
>>>
>>> I just would like to know if there are any plans for JXPath to
>>> provide
>>> special support for navigating JNDI, JMX and filesystems.
>>>
>>> Thanks,
>>> Michael
>>>
>>> ---------------------------------------------------------------------
>>> To unsubscribe, e-mail: commons-user-unsubscribe@jakarta.apache.org
>>> For additional commands, e-mail: commons-user-help@jakarta.apache.org
>>>
>>>
>>
>>
>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: commons-user-unsubscribe@jakarta.apache.org
>> For additional commands, e-mail: commons-user-help@jakarta.apache.org
>>
>>
>>
>>
>
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: commons-user-unsubscribe@jakarta.apache.org
> For additional commands, e-mail: commons-user-help@jakarta.apache.org
>
>
---------------------------------------------------------------------
To unsubscribe, e-mail: commons-user-unsubscribe@jakarta.apache.org
For additional commands, e-mail: commons-user-help@jakarta.apache.org
Re: [JXPath] Plans for JNDI, JMX and Filesystems?
Posted by Michael Nascimento Santos <mi...@hotmail.com>.
So, I would like to get back to my original question: any plans for JNDI,
JMX and/or filesystem support?
Thanks,
Michael
---------------------------------------------------------------------
To unsubscribe, e-mail: commons-dev-unsubscribe@jakarta.apache.org
For additional commands, e-mail: commons-dev-help@jakarta.apache.org
Re: [JXPath] Plans for JNDI, JMX and Filesystems?
Posted by Dmitri Plotnikov <dm...@apache.org>.
In my opinion, XPath is much too weak of a query language for relational
databases. What you want is something like XQuery, which is a superset of
XPath that includes relational semantics a la SQL.
I wonder if there is an open source project similar to JXPath, but with
XQuery as the base language. I looked at the SourceForge project called
JXQuery. Very interesting, but it does not appear to have ambitions beyond
XML applications. Did I misunderstand?
Mapping of XPath semantics to Java objects is a highly contraversial issue -
when I was building JXPath I had to make many decisions on that front that I
myself was not very comfortable with. I can only imagine the magnitude of
this problem if we try to map XQuery to arbitrary object models. Can
anybody see an easy solution there?
- Dmitri
----- Original Message -----
From: "Brian McCallister" <mc...@forthillcompany.com>
To: "Jakarta Commons Users List" <co...@jakarta.apache.org>
Sent: Friday, January 02, 2004 11:15 PM
Subject: Re: [JXPath] Plans for JNDI, JMX and Filesystems?
> I don't know about these, but I am trying to talk any of the JXPathers
> into helping put together the ability to query persistent object models
> via OJB (which will mean building OJB queries from JXPath AST's or
> something)...
>
> -Brian
>
> On Jan 2, 2004, at 3:49 PM, Michael Nascimento Santos wrote:
>
> > Hey,
> >
> > I just would like to know if there are any plans for JXPath to provide
> > special support for navigating JNDI, JMX and filesystems.
> >
> > Thanks,
> > Michael
> >
> > ---------------------------------------------------------------------
> > To unsubscribe, e-mail: commons-user-unsubscribe@jakarta.apache.org
> > For additional commands, e-mail: commons-user-help@jakarta.apache.org
> >
> >
>
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: commons-user-unsubscribe@jakarta.apache.org
> For additional commands, e-mail: commons-user-help@jakarta.apache.org
>
>
>
>
---------------------------------------------------------------------
To unsubscribe, e-mail: commons-user-unsubscribe@jakarta.apache.org
For additional commands, e-mail: commons-user-help@jakarta.apache.org
Re: [JXPath] Plans for JNDI, JMX and Filesystems?
Posted by Dmitri Plotnikov <dm...@apache.org>.
In my opinion, XPath is much too weak of a query language for relational
databases. What you want is something like XQuery, which is a superset of
XPath that includes relational semantics a la SQL.
I wonder if there is an open source project similar to JXPath, but with
XQuery as the base language. I looked at the SourceForge project called
JXQuery. Very interesting, but it does not appear to have ambitions beyond
XML applications. Did I misunderstand?
Mapping of XPath semantics to Java objects is a highly contraversial issue -
when I was building JXPath I had to make many decisions on that front that I
myself was not very comfortable with. I can only imagine the magnitude of
this problem if we try to map XQuery to arbitrary object models. Can
anybody see an easy solution there?
- Dmitri
----- Original Message -----
From: "Brian McCallister" <mc...@forthillcompany.com>
To: "Jakarta Commons Users List" <co...@jakarta.apache.org>
Sent: Friday, January 02, 2004 11:15 PM
Subject: Re: [JXPath] Plans for JNDI, JMX and Filesystems?
> I don't know about these, but I am trying to talk any of the JXPathers
> into helping put together the ability to query persistent object models
> via OJB (which will mean building OJB queries from JXPath AST's or
> something)...
>
> -Brian
>
> On Jan 2, 2004, at 3:49 PM, Michael Nascimento Santos wrote:
>
> > Hey,
> >
> > I just would like to know if there are any plans for JXPath to provide
> > special support for navigating JNDI, JMX and filesystems.
> >
> > Thanks,
> > Michael
> >
> > ---------------------------------------------------------------------
> > To unsubscribe, e-mail: commons-user-unsubscribe@jakarta.apache.org
> > For additional commands, e-mail: commons-user-help@jakarta.apache.org
> >
> >
>
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: commons-user-unsubscribe@jakarta.apache.org
> For additional commands, e-mail: commons-user-help@jakarta.apache.org
>
>
>
>
---------------------------------------------------------------------
To unsubscribe, e-mail: commons-dev-unsubscribe@jakarta.apache.org
For additional commands, e-mail: commons-dev-help@jakarta.apache.org
Re: [JXPath] Plans for JNDI, JMX and Filesystems?
Posted by Brian McCallister <mc...@forthillcompany.com>.
I don't know about these, but I am trying to talk any of the JXPathers
into helping put together the ability to query persistent object models
via OJB (which will mean building OJB queries from JXPath AST's or
something)...
-Brian
On Jan 2, 2004, at 3:49 PM, Michael Nascimento Santos wrote:
> Hey,
>
> I just would like to know if there are any plans for JXPath to provide
> special support for navigating JNDI, JMX and filesystems.
>
> Thanks,
> Michael
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: commons-user-unsubscribe@jakarta.apache.org
> For additional commands, e-mail: commons-user-help@jakarta.apache.org
>
>
---------------------------------------------------------------------
To unsubscribe, e-mail: commons-user-unsubscribe@jakarta.apache.org
For additional commands, e-mail: commons-user-help@jakarta.apache.org
Re: [JXPath] Plans for JNDI, JMX and Filesystems?
Posted by Dmitri Plotnikov <dp...@yahoo.com>.
Michael,
We are the ones making plans here. Let's see what the requirement for
having support for JNDI, JMX and filesystems is. If there is indeed a
good justification for these additions, we will put them in the plan.
Thanks,
- Dmitri
--- Michael Nascimento Santos <mi...@hotmail.com> wrote:
> Hey,
>
> I just would like to know if there are any plans for JXPath to
> provide
> special support for navigating JNDI, JMX and filesystems.
>
> Thanks,
> Michael
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: commons-user-unsubscribe@jakarta.apache.org
> For additional commands, e-mail: commons-user-help@jakarta.apache.org
>
__________________________________
Do you Yahoo!?
Yahoo! Hotjobs: Enter the "Signing Bonus" Sweepstakes
http://hotjobs.sweepstakes.yahoo.com/signingbonus
---------------------------------------------------------------------
To unsubscribe, e-mail: commons-user-unsubscribe@jakarta.apache.org
For additional commands, e-mail: commons-user-help@jakarta.apache.org
[JXPath] Plans for JNDI, JMX and Filesystems?
Posted by Michael Nascimento Santos <mi...@hotmail.com>.
Hey,
I just would like to know if there are any plans for JXPath to provide
special support for navigating JNDI, JMX and filesystems.
Thanks,
Michael
---------------------------------------------------------------------
To unsubscribe, e-mail: commons-user-unsubscribe@jakarta.apache.org
For additional commands, e-mail: commons-user-help@jakarta.apache.org
Re: [JXPath] Verbose mode?
Posted by Dmitri Plotnikov <dm...@apache.org>.
There is currently no such mechanism, but it sounds like a fantastic idea -
I think I will implement that very soon.
Thank you,
- Dmitri
----- Original Message -----
From: "Jochen Bedersdorfer" <be...@xtramind.com>
To: <co...@jakarta.apache.org>
Sent: Friday, January 02, 2004 4:59 AM
Subject: [JXPath] Verbose mode?
> Hi there,
>
> is there a verbose mode somewhere hidden inside JXPath?
> I have trouble with the XPath expressions I am using.
> Being able to track the search process of XPath would really be helpful.
>
> Thanks for the help,
> Jochen
>
> --
>
> Jochen Bedersdorfer
> Senior Software Architect
>
> XtraMind Technologies GmbH
> Stuhlsatzenhausweg 3
> D-66123 Saarbruecken
> Phone: +49 (681) 302 5100
> Fax: +49 (681) 302 5109
> beders@xtramind.com
> www.xtramind.com
>
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: commons-user-unsubscribe@jakarta.apache.org
> For additional commands, e-mail: commons-user-help@jakarta.apache.org
>
>
>
>
---------------------------------------------------------------------
To unsubscribe, e-mail: commons-user-unsubscribe@jakarta.apache.org
For additional commands, e-mail: commons-user-help@jakarta.apache.org