Added script for correctly restoring the database from a dump recreating the generated columns

This repository defines the VOSpace database structure.

It consists in a PostgreSQL database with the [ltree](https://www.postgresql.org/docs/12/ltree.html) extension. SQL files are named starting with a number because they are put in a Docker image where they have to be executed in order.

## Dump and restore

To restore the file catalog from a dump it is necessary to drop the generated columns and regenerate them after the import. This can be done using the restore_db.sh script located in the dump_and_restore folder of this repository.

To obtain a data only dump of the database use the following command:

    pg_dump -h <hostname> -U postgres --data-only --format=tar vospace_testdb > mydump.tar

Then you can use the restore script in the following way:

    ./restore_db.sh -U postgres -h 127.0.0.1 -p 5432 -d vospace_testdb mydump.tar

 No newline at end of file

ALTER TABLE node ADD COLUMN path ltree GENERATED ALWAYS AS (path(parent_path, node_id)) STORED;

CREATE INDEX file_path_gist_idx ON node USING GIST(path);

CREATE UNIQUE INDEX file_path_idx ON node USING btree(path);

ALTER TABLE node ADD COLUMN relative_path ltree GENERATED ALWAYS AS (path(parent_relative_path, node_id)) STORED;

CREATE INDEX file_rel_path_gist_idx ON node USING GIST(relative_path);

DELETE FROM node;

ALTER SEQUENCE node_node_id_seq RESTART WITH 1;

-- Generated columns need to be dropped and generated again. This causes also path support views to be dropped

ALTER TABLE node DROP COLUMN path CASCADE;

ALTER TABLE node DROP COLUMN relative_path CASCADE;

#!/bin/bash

user="postgres"

host="localhost"

port="5432"

database="postgres"

while [[ "$#" -gt 0 ]]; do

    case $1 in

        -U) user="$2"; shift ;;

        -h) host="$2"; shift ;;

        -p) port="$2"; shift ;;

        -d) database="$2"; shift ;;

        *) dump_file="$1" ;;

    esac

    shift

done

if [ -z "$dump_file" ]; then

    echo "Specify dump file as last argument"

    exit 1

fi

psql -U $user -h $host -p $port $database < pre-restore.sql

pg_restore -U $user -h $host -p $port -d $database $dump_file

psql -U $user -h $host -p $port $database < path-indexes.sql

psql -U $user -h $host -p $port $database < ../02-views.sql