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mylar/mylar/db.py

101 lines
3.4 KiB
Python
Executable file

# This file is part of Mylar.
#
# Mylar is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Mylar is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Mylar. If not, see <http://www.gnu.org/licenses/>.
#####################################
## Stolen from Sick-Beard's db.py ##
#####################################
from __future__ import with_statement
import os
import sqlite3
import threading
import time
import mylar
from mylar import logger
db_lock = threading.Lock()
def dbFilename(filename="mylar.db"):
return os.path.join(mylar.DATA_DIR, filename)
class DBConnection:
def __init__(self, filename="mylar.db"):
self.filename = filename
self.connection = sqlite3.connect(dbFilename(filename), timeout=20)
self.connection.row_factory = sqlite3.Row
def action(self, query, args=None):
with db_lock:
if query == None:
return
sqlResult = None
attempt = 0
while attempt < 5:
try:
if args == None:
#logger.debug(self.filename+": "+query)
sqlResult = self.connection.execute(query)
else:
#logger.debug(self.filename+": "+query+" with args "+str(args))
sqlResult = self.connection.execute(query, args)
self.connection.commit()
break
except sqlite3.OperationalError, e:
if "unable to open database file" in e.message or "database is locked" in e.message:
logger.warn('Database Error: %s' % e)
attempt += 1
time.sleep(1)
else:
logger.error('Database error: %s' % e)
raise
except sqlite3.DatabaseError, e:
logger.error('Fatal Error executing %s :: %s' % (query, e))
raise
return sqlResult
def select(self, query, args=None):
sqlResults = self.action(query, args).fetchall()
if sqlResults == None:
return []
return sqlResults
def upsert(self, tableName, valueDict, keyDict):
changesBefore = self.connection.total_changes
genParams = lambda myDict : [x + " = ?" for x in myDict.keys()]
query = "UPDATE "+tableName+" SET " + ", ".join(genParams(valueDict)) + " WHERE " + " AND ".join(genParams(keyDict))
self.action(query, valueDict.values() + keyDict.values())
if self.connection.total_changes == changesBefore:
query = "INSERT INTO "+tableName+" (" + ", ".join(valueDict.keys() + keyDict.keys()) + ")" + \
" VALUES (" + ", ".join(["?"] * len(valueDict.keys() + keyDict.keys())) + ")"
self.action(query, valueDict.values() + keyDict.values())