问题
In postgres 9.2 I am trying to create a python program that can be a trigger. I want to run an external program (an exe on the local disk) so I am using python to run it. When I try to create a simple program like this:
CREATE FUNCTION one ()
RETURNS int
AS $$
# PL/Python function body
$$ LANGUAGE plpythonu;
I get the error:
ERROR: language "plpythonu" does not exist
HINT: Use CREATE LANGUAGE to load the language into the database.
When I run:
CREATE LANGUAGE plpythonu
I get the error:
ERROR: could not access file "$libdir/plpython2": No such file or directory
I am using Windows 7 and python 2.5 .
I have looked in many places but cannot find a solution.
Any ideas?
回答1:
To resolve this for plpython3, it was necessary to:
- Install Python 3.2
- Run
CREATE LANGUAGE plpython3u
Update: I've written a much better explanation here: https://stackoverflow.com/a/24218449/398670
回答2:
I have just solved this problem, literally a few days back. The solution is quite involved. Here it goes.
- Install python 3.2.* version only on your system.
In Postgresql use the 'CREATE LANGUAGE plpython3u' command to install Python 3 language support. More often than not, it will give the following error "unable to load ".....\plpython3.dll" error 126. (Note if it installs correctly, no error will be displayed.)
In case you get the above error, goto your python installation directory (default is C:\python32) and look for "python3.dll" in the DLL's folder. Copy this file to your Postgresql 'lib' folder in the installation directory of Postgres (default is c:\program files\postgres\9.x\lib\"). Rename this copied file to python32.dll.
Now run the 'CREATE LANGUAGE plpython3u' command again. It should work this time.
To verify, check out the pg_available_extensions view in the system tables of postgresql. The row containing plpython3u should have a version number in the 'installed version' column.
Note : This only works for plpython3u language. I do not know any similar process for plpython2u.
回答3:
Postgres uses the ActiveState distros of Python. Most likely, your 2.5 is too outdated and Postgres cant load the plpython dll or didn't install it because there was no suitable python. I think recent postgres is buil6 against Python3 not 2.x. You can look in the postgres lib directory for plpython3.dll to find out what you need.
回答4:
I'm installed python 3.2(x64) y postgres 9.3 (x64)
Execute this code CREATE EXTENSION plpython3u
Do not forget to check the "installation-note.html" your version of postgresSQL there are specific python version for your postgresSQL
来源：https://stackoverflow.com/questions/14106388/postgres-and-python