jython 2 cpython bridge

[Randall Smith]

I would like to use a type 4 JDBC driver in my Python program. I
believe I can use in with Jython. Do you know of some way to
communicate between the Jython and Python processes so that the CPython
program can use the Jython JDBC database connection?

Randall

[tertius]

Re: jython 2 cpython bridge

Randall Smith wrote:[color=blue]
> I would like to use a type 4 JDBC driver in my Python program. I
> believe I can use in with Jython. Do you know of some way to
> communicate between the Jython and Python processes so that the CPython
> program can use the Jython JDBC database connection?
>
> Randall[/color]

Write the application using Jython. Then use SimpleXMLRPCSer ver on the
Jython side to register the necessary functions for an XML-RPC client
written in Python.

HTH
T

[Irmen de Jong]

Re: jython 2 cpython bridge

Randall Smith wrote:
[color=blue]
> I would like to use a type 4 JDBC driver in my Python program. I
> believe I can use in with Jython. Do you know of some way to
> communicate between the Jython and Python processes so that the CPython
> program can use the Jython JDBC database connection?[/color]

Create some form of IPC between the two, for instance using xmlrpc.

--Irmen

PS: I would have suggested to use Pyro, but:
- Java/Jython doesn't have the select() system call that Pyro needs for a server,
- There are bugs in Jython that make it crash when compiling Pyro's source.

[Steve Menard]

Re: jython 2 cpython bridge

Irmen de Jong wrote:[color=blue]
> Randall Smith wrote:
>[color=green]
>> I would like to use a type 4 JDBC driver in my Python program. I
>> believe I can use in with Jython. Do you know of some way to
>> communicate between the Jython and Python processes so that the
>> CPython program can use the Jython JDBC database connection?[/color]
>
>
> Create some form of IPC between the two, for instance using xmlrpc.
>
> --Irmen
>
> PS: I would have suggested to use Pyro, but:
> - Java/Jython doesn't have the select() system call that Pyro needs for
> a server,
> - There are bugs in Jython that make it crash when compiling Pyro's
> source.[/color]

<shameless plug>
Alternately, you can look at JPype ( http://jpype.sourceforge.net ).

It is still a very early release, but I would welcome any feeback. And
version 0.1 should allow you to use JDBC without problem.

It currently only works on Windows, but if there is interest, I could
make a linux release pretty quickly.

</shameless plug>

[Dominic]

Re: jython 2 cpython bridge

[color=blue]
> Alternately, you can look at JPype ( http://jpype.sourceforge.net ).[/color]
Wow. Cool idea :-)

Ciao,
Dominic

[John J. Lee]

Re: jython 2 cpython bridge

Steve Menard <steve.menard@v ideotron.ca> writes:
[...][color=blue]
> Alternately, you can look at JPype ( http://jpype.sourceforge.net ).
>
> It is still a very early release, but I would welcome any feeback. And
> version 0.1 should allow you to use JDBC without problem.
>
> It currently only works on Windows, but if there is interest, I could
> make a linux release pretty quickly.[/color]

I assume you've seen JPE?

How does / will JPype differ from that?

I *think* JPE hasn't been maintained for quite a while, but I'm not
certain what its current state is.


John

[Steve Menard]

Re: jython 2 cpython bridge

John J. Lee wrote:[color=blue]
> Steve Menard <steve.menard@v ideotron.ca> writes:
> [...]
>[color=green]
>>Alternately , you can look at JPype ( http://jpype.sourceforge.net ).
>>
>>It is still a very early release, but I would welcome any feeback. And
>>version 0.1 should allow you to use JDBC without problem.
>>
>>It currently only works on Windows, but if there is interest, I could
>>make a linux release pretty quickly.[/color]
>
>
> I assume you've seen JPE?
>
> How does / will JPype differ from that?
>
> I *think* JPE hasn't been maintained for quite a while, but I'm not
> certain what its current state is.
>
>
> John[/color]

Yes I have seen JPE. However, from the my admitedly quick look, it
didn't allow the seemless integration I am looking for. Either that, or
the samples did show off what JPE could do.

Besides I intend to take JPype beyonf Python->Java integration, and
choice is always good :)

Steve

[John J. Lee]

Re: jython 2 cpython bridge

Steve Menard <steve.menard@v ideotron.ca> writes:
[...][color=blue]
> Besides I intend to take JPype beyonf Python->Java integration, and
> choice is always good :)[/color]

Especially when the closest alternative is unmaintained! I've
certainly wanted something like this in the past.

Good luck with your project.


John

[Nicolas Lehuen]

Re: jython 2 cpython bridge

Steve Menard <steve.menard@v ideotron.ca> wrote in message news:<ztHsc.424 67$Fk4.1873925@ wagner.videotro n.net>...[color=blue]
> Irmen de Jong wrote:[color=green]
> > Randall Smith wrote:
> >[color=darkred]
> >> I would like to use a type 4 JDBC driver in my Python program. I
> >> believe I can use in with Jython. Do you know of some way to
> >> communicate between the Jython and Python processes so that the
> >> CPython program can use the Jython JDBC database connection?[/color]
> >
> >
> > Create some form of IPC between the two, for instance using xmlrpc.
> >
> > --Irmen
> >
> > PS: I would have suggested to use Pyro, but:
> > - Java/Jython doesn't have the select() system call that Pyro needs for
> > a server,
> > - There are bugs in Jython that make it crash when compiling Pyro's
> > source.[/color]
>
> <shameless plug>
> Alternately, you can look at JPype ( http://jpype.sourceforge.net ).
>
> It is still a very early release, but I would welcome any feeback. And
> version 0.1 should allow you to use JDBC without problem.
>
> It currently only works on Windows, but if there is interest, I could
> make a linux release pretty quickly.
>
> </shameless plug>[/color]

That's awesome ! This is still a little bit rough on the edges, but it
already works well enough to have an idea of what it could bring to
Python.

This is what I mean by 'rough on the edge' : launching a Python
program using JPype from a .py file is OK, but using the prompt is
weird :
[color=blue][color=green][color=darkred]
>>> from jpype import *
>>> startJVM(r"C:\j 2sdk1.4.2_03\jr e\bin\client\jv m.dll", "-ea")
>>> 1+1[/color][/color][/color]
File "<stdin>", line 1
1+1
^
SyntaxError: invalid syntax[color=blue][color=green][color=darkred]
>>> help()[/color][/color][/color]
File "<stdin>", line 1
help()
^
SyntaxError: invalid syntax

Anyway, this is extremely promising. Soon, we'll be able to seamlessly
use Java object thanks to JPype, as we do with COM objects using
win32all or ctypes. Python is THE real integration/composition
platform !

Thanks for your work, Steve.

Regards,
Nicolas

[Steve M?nard]

Re: jython 2 cpython bridge

nicolas@lehuen. com (Nicolas Lehuen) wrote in message
<<snip>>[color=blue][color=green]
> >
> > <shameless plug>
> > Alternately, you can look at JPype ( http://jpype.sourceforge.net ).
> >
> > It is still a very early release, but I would welcome any feeback. And
> > version 0.1 should allow you to use JDBC without problem.
> >
> > It currently only works on Windows, but if there is interest, I could
> > make a linux release pretty quickly.
> >
> > </shameless plug>[/color]
>
> That's awesome ! This is still a little bit rough on the edges, but it
> already works well enough to have an idea of what it could bring to
> Python.
>
> This is what I mean by 'rough on the edge' : launching a Python
> program using JPype from a .py file is OK, but using the prompt is
> weird :
>[color=green][color=darkred]
> >>> from jpype import *
> >>> startJVM(r"C:\j 2sdk1.4.2_03\jr e\bin\client\jv m.dll", "-ea")
> >>> 1+1[/color][/color]
> File "<stdin>", line 1
> 1+1
> ^
> SyntaxError: invalid syntax[color=green][color=darkred]
> >>> help()[/color][/color]
> File "<stdin>", line 1
> help()
> ^
> SyntaxError: invalid syntax
>
> Anyway, this is extremely promising. Soon, we'll be able to seamlessly
> use Java object thanks to JPype, as we do with COM objects using
> win32all or ctypes. Python is THE real integration/composition
> platform !
>
> Thanks for your work, Steve.
>
> Regards,
> Nicolas[/color]

Thanks for your enthusiasm, and for the feedback.

However, I have tried what you've described above, and had no problem.
further An invalid syntax is usually something thrown by the parser,
way before any JPype-related code sees the commands.

If the problem persists, can you enter a bug report at JPype's
souceforge project page? ( http://sourceforge.net/projects/jpype/ )

I would like to use SF's tracking features to keep everyone up to date
on what is going on. As a matter of fact you'll be able to track each
releases progress by looking at the task list.

Again, thanks for your interest.

Steve Ménard

[John Mudd]

Re: jython 2 cpython bridge

How about Spiro?

http://www.freenet.org.nz/python/spiro/

Randall Smith <randall@tnr.cc > wrote in message news:<8dssc.179 150$f_5.163363@ lakeread01>...[color=blue]
> I would like to use a type 4 JDBC driver in my Python program. I
> believe I can use in with Jython. Do you know of some way to
> communicate between the Jython and Python processes so that the CPython
> program can use the Jython JDBC database connection?
>
> Randall[/color]