Обсуждение: OLE DB driver
Hi all,
After unsuccessfully trying to join the current OLE DB project on gborg,
I'm writing my own. So far I don't have anything too fancy (just trying
to get over the initial shock of what OLE DB actually is). It currently
does the basic infrastructure, but does not yet actually connect to
Postgresql. If anyone else has written code, was contemplating writing
code, has access to the gborg project, or is otherwise interested,
please let me know.
I'm hoping to be able to do some sort of preliminary release in about a
week.
Shachar
--
Shachar Shemesh
Lingnu Open Systems Consulting
http://www.lingnu.com/
Shachar Shemesh wrote: > Hi all, > > After unsuccessfully trying to join the current OLE DB project on > gborg, I'm writing my own. So far I don't have anything too fancy > (just trying to get over the initial shock of what OLE DB actually > is). It currently does the basic infrastructure, but does not yet > actually connect to Postgresql. If anyone else has written code, was > contemplating writing code, has access to the gborg project, or is > otherwise interested, please let me know. > I wonder if this could be implemented as a wrapper around libpq. This way, the OLEDB driver would benefit from a proven piece of software. Regards, Andreas
Andreas Pflug wrote:
> I wonder if this could be implemented as a wrapper around libpq. This
> way, the OLEDB driver would benefit from a proven piece of software.
>
> Regards,
> Andreas
That's what I'm doing. I'm not sure why other drivers didn't do that as
well (maybe there was no native Windows port of libpq at the time?).
My reason is actually that I'm not a great postgres hacker, and I would
rather rely as little as possible on internal structures and things that
are likely to change in the future.
Shachar
--
Shachar Shemesh
Lingnu Open Systems Consulting
http://www.lingnu.com/
Shachar Shemesh wrote: > Andreas Pflug wrote: > >> I wonder if this could be implemented as a wrapper around libpq. This >> way, the OLEDB driver would benefit from a proven piece of software. >> >> Regards, >> Andreas > > > That's what I'm doing. I'm not sure why other drivers didn't do that > as well (maybe there was no native Windows port of libpq at the time?). > > My reason is actually that I'm not a great postgres hacker, and I > would rather rely as little as possible on internal structures and > things that are likely to change in the future. Sounds good. While I probably won't find time helping implementing the driver; I have an OLEDB app running that currently uses MSDASQL/psqlODBC. I'd certainly like testing your driver, and give feedback from that. When do you expect first usable versions? Regards, Andreas
Andreas Pflug wrote:
> Sounds good. While I probably won't find time helping implementing the
> driver; I have an OLEDB app running that currently uses
> MSDASQL/psqlODBC. I'd certainly like testing your driver, and give
> feedback from that.
That would be great.
> When do you expect first usable versions?
That depends. I'm hoping to have a version that implements the basic
(read - mandatory) interfaces later this week. A more broad version will
take longer.
I also wanted to ask the list's opinion about a gborg/sourceforge
hosting. The current oledb project on gborg seems dead. Should I open
another one?
Shachar
--
Shachar Shemesh
Lingnu Open Systems Consulting
http://www.lingnu.com/
"Shachar Shemesh" <psql@shemesh.biz> wrote:3FFF1607.9090806@shemesh.biz... > Andreas Pflug wrote: > > > I wonder if this could be implemented as a wrapper around libpq. This > > way, the OLEDB driver would benefit from a proven piece of software. > > > > Regards, > > Andreas > > That's what I'm doing. I'm not sure why other drivers didn't do that as > well (maybe there was no native Windows port of libpq at the time?). AFAIK, rely on libpq is a fast way but not always convenient. OLEDB has many features borrowed from ODBC, and it is a substitute for ODBC. Microsoft is now making ODBC obsolete and advocating OLEDB instead. You'd better read pgodbc's source code, too. > > My reason is actually that I'm not a great postgres hacker, and I would > rather rely as little as possible on internal structures and things that > are likely to change in the future. > > Shachar > > -- > Shachar Shemesh > Lingnu Open Systems Consulting > http://www.lingnu.com/ > > > > ---------------------------(end of broadcast)--------------------------- > TIP 3: if posting/reading through Usenet, please send an appropriate > subscribe-nomail command to majordomo@postgresql.org so that your > message can get through to the mailing list cleanly >
William ZHANG wrote: >"Shachar Shemesh" <psql@shemesh.biz> wrote:3FFF1607.9090806@shemesh.biz... > > >>Andreas Pflug wrote: >> >> >> >>>I wonder if this could be implemented as a wrapper around libpq. This >>>way, the OLEDB driver would benefit from a proven piece of software. >>> >>>Regards, >>>Andreas >>> >>> >>That's what I'm doing. I'm not sure why other drivers didn't do that as >>well (maybe there was no native Windows port of libpq at the time?). >> >> > >AFAIK, rely on libpq is a fast way but not always convenient. > > Seems like more convinent than hacking the client/server protocol myself. I may come up to a wall later on, and then I may reconsider. >OLEDB has many features borrowed from ODBC, and it is a >substitute for ODBC. Microsoft is now making ODBC obsolete and >advocating OLEDB instead. You'd better read pgodbc's source >code, too. > > > I did some of that, and did some ODBC hacking too (very little). The fact that ODBC uses it's own protocol implementation, I think, is a mistake. There are places where some intervention is going to be unavoidable, I'm afraid, but that has nothing to do with what protocol to use for communicating with the back end. If Postgres doesn't support writeable cursors, then it doesn't support writeable cursors. One has to emulate them. I will defenitely use some borrowing from pgsqlODBC (the main reason my OLE DB is LGPL was so I can do that). -- Shachar Shemesh Lingnu Open Systems Consulting http://www.lingnu.com/
On Saturday 10 January 2004 13:55, Shachar Shemesh wrote:
> Andreas Pflug wrote:
> > Sounds good. While I probably won't find time helping implementing the
> > driver; I have an OLEDB app running that currently uses
> > MSDASQL/psqlODBC. I'd certainly like testing your driver, and give
> > feedback from that.
>
> That would be great.
>
> > When do you expect first usable versions?
>
> That depends. I'm hoping to have a version that implements the basic
> (read - mandatory) interfaces later this week. A more broad version will
> take longer.
>
> I also wanted to ask the list's opinion about a gborg/sourceforge
> hosting. The current oledb project on gborg seems dead. Should I open
> another one?
>
Can you fill us in on your efforts to contact the original project author? If
those efforts have failed and the code is no longer being maintained, we can
contact the gborg maintainer about making you the admin for the project. I
don't think there is an official policy on this, but this seems like a
reasonable request as long as your willing to either update the old code or
leave it as it's own seperate module within the cvs tree.
Robert Treat
--
Build A Brighter Lamp :: Linux Apache {middleware} PostgreSQL
> -----Original Message----- > From: Shachar Shemesh [mailto:psql@shemesh.biz] > Sent: 11 January 2004 20:21 > To: William ZHANG > Cc: pgsql-hackers@postgresql.org > Subject: Re: [HACKERS] OLE DB driver > > >AFAIK, rely on libpq is a fast way but not always convenient. > > > > > Seems like more convinent than hacking the client/server > protocol myself. I may come up to a wall later on, and then I > may reconsider. Seems unlikely - libpq is the definitive implementation of the protocol. > > > I did some of that, and did some ODBC hacking too (very > little). The fact that ODBC uses it's own protocol > implementation, I think, is a mistake. Yes, it would be easier if that were not the case - unfortunately that decision was made many years ago - http://pluto.iis.nsk.su/postgres95/postgres95.ODBC/ Regards, Dave.
Robert Treat wrote: >Can you fill us in on your efforts to contact the original project author? > Sure thing. Here it is: The project is located at http://gborg.postgresql.org/project/oledb/projdisplay.php. It has released no code, shows no CVS activity, and seems rather empty. There are two tasks listed, without any status attached to them. There was one bug, which suggests that there used to be some code, but it's in "submitted" state, and I'm not sure what it relates to. The front page says "please email me if you want to join". However, I could not locate the email address for "mosiu", the administrator. Lastly, I used the form to ask to become a developer of this project (about a month ago). I have received no answer of any kind. As such, I reached the conclusion that this project is terminally dead, and that it's code is unrecoverable. > If >those efforts have failed and the code is no longer being maintained, we can >contact the gborg maintainer about making you the admin for the project. > I would love it if you contacted him, but I don't even have the code for the current project. The bug report seems to suggest that such a code exists, but I'm damned if I can find it. > I >don't think there is an official policy on this, but this seems like a >reasonable request as long as your willing to either update the old code or >leave it as it's own seperate module within the cvs tree. > > Like I said, there doesn't appear to be any old code to maintain. I have requested a new project on gborg (pgoledb), but getting the current name is just as good. If the current code is somehow recovered, I'll be more than glad to have a look at it. After all - I don't INSIST on writing from scratch. >Robert Treat > > Shachar -- Shachar Shemesh Lingnu Open Systems Consulting http://www.lingnu.com/
Chris, do you have any additional info (email?) on how to contact the original project admin? Is it possible for you to manually set up Shachar as admin on the project? Robert Treat On Monday 12 January 2004 04:30, Shachar Shemesh wrote: > Robert Treat wrote: > >Can you fill us in on your efforts to contact the original project author? > > Sure thing. Here it is: > The project is located at > http://gborg.postgresql.org/project/oledb/projdisplay.php. It has > released no code, shows no CVS activity, and seems rather empty. There > are two tasks listed, without any status attached to them. There was one > bug, which suggests that there used to be some code, but it's in > "submitted" state, and I'm not sure what it relates to. > > The front page says "please email me if you want to join". However, I > could not locate the email address for "mosiu", the administrator. > Lastly, I used the form to ask to become a developer of this project > (about a month ago). I have received no answer of any kind. As such, I > reached the conclusion that this project is terminally dead, and that > it's code is unrecoverable. > > > If > >those efforts have failed and the code is no longer being maintained, we > > can contact the gborg maintainer about making you the admin for the > > project. > > I would love it if you contacted him, but I don't even have the code for > the current project. The bug report seems to suggest that such a code > exists, but I'm damned if I can find it. > > > I > >don't think there is an official policy on this, but this seems like a > >reasonable request as long as your willing to either update the old code > > or leave it as it's own seperate module within the cvs tree. > > Like I said, there doesn't appear to be any old code to maintain. I have > requested a new project on gborg (pgoledb), but getting the current name > is just as good. If the current code is somehow recovered, I'll be more > than glad to have a look at it. After all - I don't INSIST on writing > from scratch. > > >Robert Treat > > Shachar -- Build A Brighter Lamp :: Linux Apache {middleware} PostgreSQL