如何在PostgreSQL中进行功能备份

Question

I am trying to backup the functions in database using the method described here How to take backup of functions only in Postgres . But it is showing error << was unexpected at this time .

The code I typed in the command prompt is given below.

psql.exe -U postgres -At dbname > /path/to/output/file.sql <<"__END__"
SELECT pg_get_functiondef(f.oid)
FROM pg_catalog.pg_proc f
INNER JOIN pg_catalog.pg_namespace n ON (f.pronamespace = n.oid)
WHERE n.nspname = 'public';
__END__

Please help.

Answer 1

I'm sure there's a way to do it, but the simplest thing is just supply the sql as one line with the -c option:

psql.exe -U postgres -At dbname -c "SELECT pg_get_functiondef(f.oid) FROM pg_catalog.pg_proc f INNER JOIN pg_catalog.pg_namespace n ON (f.pronamespace = n.oid) WHERE n.nspname = 'public'" > /path/to/output/file.sql

This is also more portable and will work with tools that need one line, like cron etc

Answer 2

This is a shell problem.

<< is a feature of Unix-like shells, while you seem to be using Windows.

Just save the text of the query into a file and run it with the -f flag.