Can't import PostgreSQL10 dump into 9.6 database

问题

I need to somehow convert a v10 dump file into one which is 9.6 compatible

Google's Cloud SQL runs PostgreSQL version 9.6 and my database has been running on version 10 since its creation.

THE ISSUE: When trying to import the database into Cloud SQL, I get the an unknown error has occurred. message of death.

I have already tried commenting out my postgis / other extensions when importing to Cloud SQL but, to no avail.

I have tried using using psql my_96_db < my_10.sql and get tons of errors like this:

...
CREATE TABLE
ERROR:  syntax error at or near "AS"
LINE 2:     AS integer
            ^
ERROR:  relation "authentication_phonecontact_id_seq" does not exist
CREATE TABLE
...

I have tried using postgres 9.6's pg_restore on my v10 pg_dump -Fc command, but it will not successfully import into a 9.6 database. An example of one of the many failures in the output is

pg_restore: [archiver (db)] could not execute query: ERROR:  relation "public.authentication_referral_id_seq" does not exist
LINE 1: SELECT pg_catalog.setval('public.authentication_referral_id_...
                                 ^
    Command was: SELECT pg_catalog.setval('public.authentication_referral_id_seq', 1, false);

回答1:

Judging from the error messages you show, you'll have to edit the SQL dump and remove all occurrences of AS integer from all CREATE SEQUENCE statements.

The AS data_type clause of CREATE SEQUENCE is new in PostgreSQL v10, and older server versions will not understand it.

回答2:

Following @"Laurenz Albe" suggestion, here's a python3 snippet can be used to downgrade a 10.x pg_dump script for 9.x:

#!/usr/bin/env python3
import sys

#
#  Downgrades pg_dump 10 script to 9.x
#  removing 'AS integer' from 'CREATE SEQUENCE' statement
#
#  Usage:
#       $ python3 pgdump_10_to_9.py < test10.sql > test9.sql
#  or:
#       $ cat test10.sql | ./pgdump_10_to_9.py > test9.sql
#
#  To obtain a compressed 9.x sql script from a compressed 10 sql script:
#
#       $ gunzip -c test10.sql.gz | ./pgdump_10_to_9.py | gzip > test9.sql.gz
#

inside_create_sequence = False
for row in sys.stdin.readlines():

    if inside_create_sequence and row.strip().lower() == 'as integer':
        pass
    else:
        print(row, end='', flush=True)

    inside_create_sequence = row.strip().startswith('CREATE SEQUENCE ')

来源：https://stackoverflow.com/questions/49547602/cant-import-postgresql10-dump-into-9-6-database

标签

postgresql

version

google-cloud-sql