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Re: Query on support for trigger functions defined in a Shared library in Windows

From: Reini Urban <rurban(at)x-ray(dot)at>
To: Mehul Doshi-A20614 <mehul(at)motorola(dot)com>
Cc: Magnus Hagander <mha(at)sollentuna(dot)net>, pgsql-hackers-win32(at)postgresql(dot)org
Subject: Re: Query on support for trigger functions defined in a Shared library in Windows
Date: 2006-01-27 10:00:51
Message-ID: 6910a60601270200s3e5fe7a6y@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-hackers-win32
2006/1/24, Mehul Doshi-A20614 <mehul(at)motorola(dot)com>:
> This is related to the problem that I faced some time ago. I have
> created a dll library file with inbuilt constraints and triggers.
> I also built the same for Linux environment. Here's what I am facing.
> Any clues as to what I am doing wrong?
>
> Linux: Fedora Core 2 Running Postgresql 7.4.2
> Windows: Windows XP Service Pack 2 running PostgreSQL 8.1.2
>
> The testtrigfuncs.dll is placed in C:\Program Files\Test\lib\ directory
> and in Linux it is placed in /opt/WMS/rel/lib/testtrigfuncs.so
>
> On linux when I do the following it works:
> createdb test
> test=# CREATE OR REPLACE FUNCTION trigf_test_pid_insert() RETURNS
> trigger
> test-#   AS '/opt/WMS/rel/lib/testtrigfuncs.so'
> test-#   LANGUAGE C ;
> CREATE FUNCTION
> test=#
>
> On Windows for the same I get: (Includes extra \ to account for Windows)
>
> test=# CREATE OR REPLACE FUNCTION trigf_test_pid_insert() RETURNS
> trigger
> test-#   AS 'C:\\Program Files\\Test\\lib\\testtrigfuncs.dll'
> test-#   LANGUAGE C ;
> ERROR:  could not load library "C:\Program
> Files\Test\lib\testtrigfuncs.dll": The specified module could not be
> found.

Surround the path with extra "" because of the space in the path.

AS '"C:\\Program Files\\Test\\lib\\testtrigfuncs.dll"'

Or better move your lib to a path without spaces.

> I went and modified the dynamic_library_path to
> dynamic_library_path = 'C:\Program Files\Test\lib;$libdir'
>
> I also added C:\Program Files\Test\lib to the PATH variable. I restarted
> postgres service and then retried the below.
>
> test=# CREATE OR REPLACE FUNCTION trigf_test_pid_insert() RETURNS
> trigger
> test-#   AS 'C:\Program Files\Test\lib\testtrigfuncs.dll'
> test-#   LANGUAGE C ;
> ERROR:  component in parameter "dynamic_library_path" is not an absolute
> path
> test=#
>
> What is this absolute path? Where do I set it? While I know that if I
> place
> testtrigfuncs.dll in C:\Program Files\PostgreSQL\8.1\bin folder and do
> the
> same it works.
>
> test=# CREATE OR REPLACE FUNCTION trigf_stdhlr_pid_insert() RETURNS
> trigger
> test-#   AS 'C:\\Program Files\\PostgreSQL\\8.1\\bin\\testtrigfuncs.dll'
> test-#   LANGUAGE C ;
> CREATE FUNCTION
> test=#
>
> Any clues on what I need to do to go ahead would be great. I want to be
> able to do the
> same thing on both Linux and Windows without having to write in
> PostgreSQL\bin folder
> where my program has no use of being there.
>
> Thanks & Regards,
> Mehul
>
>
>
> -----Original Message-----
> From: Mehul Doshi-A20614
> Sent: Wednesday, July 27, 2005 8:35 AM
> To: 'Magnus Hagander'; pgsql-hackers-win32(at)postgresql(dot)org
> Cc: Mehul Doshi-A20614
> Subject: RE: [pgsql-hackers-win32] Query on support for trigger
> functions defined in a Shared library in Windows
>
>
>
> Hi Magnus,
>
> Thanks. That helped me. I used MingW to compile the code. I still used
> 8.0.0 because it is the version that we are currently working on. I will
> migrate to 8.0.3 once I am Able to validate the entire setup.
>
> I did get another problem, if you could help me out, it would be great.
> Problem Description:
> 1) I generated the dll using the code.
> 2) Added the following in postgresql.conf:
> dynamic_library_path = 'C:\test\lib,$libdir'
> The above didn't work so I went ahead and copied the dll into C:\Program
> Files\PostgreSQL\8.0\lib\
> 3) I restarted the postmaster both times. I got this error both times.
> :25: ERROR:  could not load library "C:/Program
> Files/PostgreSQL/8.0/lib/testtrigfuncs.dll": dynamic load error
>
> The log shows:
> 2005-07-26 22:38:07 DEBUG:  InitPostgres
> 2005-07-26 22:38:07 DEBUG:  StartTransaction
> 2005-07-26 22:38:07 DEBUG:  name: unnamed; blockState:       DEFAULT;
> state: INPROGR, xid/subid/cid: 33475/1/0, nestlvl: 1, children: <>
> 2005-07-26 22:38:07 DEBUG:  CommitTransaction
> 2005-07-26 22:38:07 DEBUG:  name: unnamed; blockState:       STARTED;
> state: INPROGR, xid/subid/cid: 33475/1/0, nestlvl: 1, children: <>
> 2005-07-26 22:38:07 DEBUG:  StartTransactionCommand
> 2005-07-26 22:38:07 DEBUG:  StartTransaction
> 2005-07-26 22:38:07 DEBUG:  name: unnamed; blockState:       DEFAULT;
> state: INPROGR, xid/subid/cid: 33476/1/0, nestlvl: 1, children: <>
> 2005-07-26 22:38:07 DEBUG:  ProcessUtility
> 2005-07-26 22:38:07 DEBUG:  find_in_dynamic_libpath: trying "C:/Program
> Files/PostgreSQL/8.0/lib/testtrigfuncs.dll"
> 2005-07-26 22:38:07 ERROR:  could not load library "C:/Program
> Files/PostgreSQL/8.0/lib/testtrigfuncs.dll": dynamic load error
> 2005-07-26 22:38:07 DEBUG:  proc_exit(0)
> 2005-07-26 22:38:07 DEBUG:  shmem_exit(0)
> 2005-07-26 22:38:07 DEBUG:  exit(0)
>
> However, when I ran the newly compiled postgres code (along with my test
> dll in /usr/local/pgsql/lib) via msys. It didn't give me any such errors
> and everything worked out fine. I don't know what I need to do to make
> this dll which I built run with the already installed version of
> PostgreSQL (8.0.0). I can upgrade it to 8.0.3 if it solves the problem.
>
> Please let me know. Thanks & have a nice day.
>
>
> Thanks & Regards,
> Mehul
>
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--
Reini Urban
http://phpwiki.org/
http://spacemovie.mur.at/

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