Copy in Postgresql: Absolute Path Interpreted as Relative Path

问题:

I am running this statement in a Django app:

c = connections['default'].cursor()     query="copy (select * from analysis.\"{0}\") to STDOUT DELIMITER ',' CSV HEADER;".format(view_name)             with open(csvFile,'w') as f:                 c.copy_expert(query,f)             f.close() 

It does not create the correct csv file. Some of the values appear to be in the wrong columns. I am trying to test the SQL statement by running it in POSTGRESQL:

 copy (select * from analysis."S03_2005_activity_140807_153431_with_geom") to 'C:/djangoProjects/web_output/csvfiles/S03_2005_activity_140807_153431_with_geom.csv' DELIMITER ',' CSV HEADER; 

It gives me: "ERROR: relative path not allowed for COPY to file". I have looked into the issue and it appears to typically be one of two issues: 1. confusing '\' and '/'. My slashes should be correct. 2. The server being on a different computer. I thought this may be my issue as the database is located on an external computer, but I have the connection in my Postgresql. It also runs from Django so I'm not sure why it isn't working from PG Admin.

回答1:

If you want to store data / get data from your local machine and communicate with a Postgres server on a different, remote machine, you cannot simply use COPY.

Try the meta-command \copy in psql. It's a wrapper for the SQL COPY command and uses local files.

Your filename should work as is on a Windows machine, but Postgres interprets it as a local filename on the server, which is probably a Unix derivate. And there the filename would have to start with '/'.

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