You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
53 lines
1.8 KiB
53 lines
1.8 KiB
import os |
|
import glob |
|
import imp |
|
|
|
from twisted.internet import reactor |
|
from twisted.enterprise import adbapi |
|
from twisted.internet import defer |
|
|
|
@defer.inlineCallbacks |
|
def get_schema_version(dbpool): |
|
schema_exists = yield dbpool.runQuery("SELECT name FROM sqlite_master WHERE type='table' AND name='schema_meta';") |
|
if not schema_exists: |
|
# If we get an empty list, we have no schema |
|
defer.returnValue(0) |
|
else: |
|
schema_version_result = yield dbpool.runQuery("SELECT version FROM schema_meta;") |
|
|
|
# There should only be one row in the meta table |
|
assert(len(schema_version_result) == 1) |
|
|
|
# Return the retrieved version |
|
version = schema_version_result[0][0] |
|
defer.returnValue(version) |
|
|
|
def add_schema_files(schemas): |
|
# Finds and imports all schema_*.py files into the list |
|
module_files = glob.glob(os.path.dirname(os.path.abspath(__file__)) + "/schema_*.py") |
|
for mod in module_files: |
|
module_name = os.path.basename(os.path.splitext(mod)[0]) |
|
newmod = imp.load_source('%s'%module_name, mod) |
|
schemas.append( (module_name, newmod) ) |
|
|
|
@defer.inlineCallbacks |
|
def update_schema(dbpool): |
|
# Update the database schema to the latest version |
|
schema_version = yield get_schema_version(dbpool) |
|
schemas = [] |
|
add_schema_files(schemas) |
|
schemas = sorted(schemas, key=lambda tup: tup[0]) |
|
for i in range(schema_version, len(schemas)): |
|
# schemas[0] is v1, schemas[1] is v2, etc |
|
print "Updating datafaile schema to version %d" % (i+1) |
|
yield schemas[i][1].update(dbpool) |
|
|
|
@defer.inlineCallbacks |
|
def main(): |
|
dbpool = adbapi.ConnectionPool("sqlite3", "data.db", check_same_thread=False) |
|
yield update_schema(dbpool) |
|
reactor.stop() |
|
|
|
if __name__ == '__main__': |
|
reactor.callWhenRunning(main) |
|
reactor.run()
|
|
|