[英]“Module not found” when importing a Python package within a plpython3u procedure
I am using a plpython3
stored function, on a postgres
database on MacOS
(installed with standard Enterprise DB package). 我在
MacOS
(与标准Enterprise DB软件包一起安装)的postgres
数据库上使用了plpython3
存储的函数。
I can import standard python packages such as: 我可以导入标准的python包,例如:
CREATE OR REPLACE FUNCTION foo(x double precision)
RETURNS double precision
LANGUAGE plpython3u
AS $$
import math
...
$$
I cannot, however import packages I have installed on the regular python3 directory on my machine, which is defined by brew: 但是,我无法导入安装在我机器上常规python3目录中的安装包,该目录由brew定义:
$ which python3
/usr/local/bin/python3
So import foo
would not work even though it would work in the regular python3 environment. 因此,即使在常规python3环境中也可以使用
import foo
也无法正常工作。
Would it be possible that the PostgreSQL
server is not using the same python3 environment as me when running plpython3u
? 运行
plpython3u
时, PostgreSQL
服务器是否可能未使用与我相同的python3环境? (perhaps it is using the python3 interpreter which is standard issue on MacOS
etc.) How can I check on that and how could I correct the configuration, in the event? (也许它使用的是python3解释器,这是
MacOS
等上的标准问题。)在发生这种情况时,我该如何检查以及如何更正配置?
And indeed, I created a stored function get_py
that does the following: 确实,我创建了一个存储函数
get_py
,它执行以下操作:
import os
return os.popen('which python').read()
And it returned: 它返回:
> select get_py()
+-----------------+
| get_py |
|-----------------|
| /usr/bin/python |
+-----------------+
(and nothing for which python3
). (而
which python3
没有)。 Which seems to demonstrate that it is not using the interpreter I want! 这似乎表明它没有使用我想要的解释器!
How do I change this? 我该如何改变?
PostgreSQL 11.5
on x86_64-apple-darwin
, compiled by Apple LLVM version 6.0 x86_64-apple-darwin
上的PostgreSQL 11.5
virtualenv
here. virtualenv
。 In addition to other environment variables like PGDATA
in a shell script (pg_service.sh), set the PYTHONPATH='/path/to/python:/path/to/your/module'
除了其他环境变量(如Shell脚本(pg_service.sh)中的
PGDATA
)外,还要设置PYTHONPATH='/path/to/python:/path/to/your/module'
Eg cat /Users/postgres/pg_service.sh 例如cat /Users/postgres/pg_service.sh
export PGDATABASE=postgres
export PGUSER=postgres
export PGPORT=5432
export PATH=/Library/PostgreSQL/11/bin:$PATH
export PGLOCALEDIR=/Library/PostgreSQL/11/share/locale
export PYTHONUSERBASE=/Users/postgres/packaging_tutorial
export PYTHONPATH=/Library/edb/languagepack-11/Python-3.6:$PYTHONUSERBASE
pg_ctl -D /Library/PostgreSQL/11/data -l /Users/postgres/logfile $1
Start the server: 启动服务器:
> sudo -u postgres /Users/postgres/pg_service.sh start
waiting for server to start.... done
server started
/Users/postgres/packaging_tutorial/example_pkg/__init__.py
: /Users/postgres/packaging_tutorial/example_pkg/__init__.py
:
def retpy3():
return 7/5
pg function: pg函数:
CREATE OR REPLACE FUNCTION expy3()
RETURNS text
LANGUAGE plpython3u
AS $$
import example_pkg
return example_pkg.retpy3()
$$;
Output 输出量
psql -c 'select * from expy3()';
expy3
--------
1.4
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