nzbToMedia/core/databases.py
2018-12-19 17:20:54 -05:00

65 lines
3.2 KiB
Python

# coding=utf-8
from core import logger, main_db
from core.nzbToMediaUtil import backup_versioned_file
MIN_DB_VERSION = 1 # oldest db version we support migrating from
MAX_DB_VERSION = 2
def backup_database(version):
logger.info("Backing up database before upgrade")
if not backup_versioned_file(main_db.db_filename(), version):
logger.log_error_and_exit("Database backup failed, abort upgrading database")
else:
logger.info("Proceeding with upgrade")
# ======================
# = Main DB Migrations =
# ======================
# Add new migrations at the bottom of the list; subclass the previous migration.
class InitialSchema(main_db.SchemaUpgrade):
def test(self):
no_update = False
if self.has_table("db_version"):
cur_db_version = self.check_db_version()
no_update = not cur_db_version < MAX_DB_VERSION
return no_update
def execute(self):
if not self.has_table("downloads") and not self.has_table("db_version"):
queries = [
"CREATE TABLE db_version (db_version INTEGER);",
"CREATE TABLE downloads (input_directory TEXT, input_name TEXT, input_hash TEXT, input_id TEXT, client_agent TEXT, status INTEGER, last_update NUMERIC, CONSTRAINT pk_downloadID PRIMARY KEY (input_directory, input_name));",
"INSERT INTO db_version (db_version) VALUES (2);"
]
for query in queries:
self.connection.action(query)
else:
cur_db_version = self.check_db_version()
if cur_db_version < MIN_DB_VERSION:
logger.log_error_and_exit(u"Your database version ({current}) is too old to migrate "
u"from what this version of nzbToMedia supports ({min})."
u"\nPlease remove nzbtomedia.db file to begin fresh.".format
(current=cur_db_version, min=MIN_DB_VERSION))
if cur_db_version > MAX_DB_VERSION:
logger.log_error_and_exit(u"Your database version ({current}) has been incremented "
u"past what this version of nzbToMedia supports ({max})."
u"\nIf you have used other forks of nzbToMedia, your database "
u"may be unusable due to their modifications.".format
(current=cur_db_version, max=MAX_DB_VERSION))
if cur_db_version < MAX_DB_VERSION: # We need to upgrade.
queries = [
"CREATE TABLE downloads2 (input_directory TEXT, input_name TEXT, input_hash TEXT, input_id TEXT, client_agent TEXT, status INTEGER, last_update NUMERIC, CONSTRAINT pk_downloadID PRIMARY KEY (input_directory, input_name));",
"INSERT INTO downloads2 SELECT * FROM downloads;",
"DROP TABLE IF EXISTS downloads;",
"ALTER TABLE downloads2 RENAME TO downloads;",
"INSERT INTO db_version (db_version) VALUES (2);"
]
for query in queries:
self.connection.action(query)