mirror of
https://github.com/rembo10/headphones.git
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112 lines
3.8 KiB
Python
112 lines
3.8 KiB
Python
# This file is part of Headphones.
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#
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# Headphones is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# Headphones is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with Headphones. If not, see <http://www.gnu.org/licenses/>.
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###################################
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# Stolen from Sick-Beard's db.py #
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###################################
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from __future__ import with_statement
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import sqlite3
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import os
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import headphones
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from headphones import logger
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def dbFilename(filename="headphones.db"):
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return os.path.join(headphones.DATA_DIR, filename)
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def getCacheSize():
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# this will protect against typecasting problems produced by empty string and None settings
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if not headphones.CONFIG.CACHE_SIZEMB:
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# sqlite will work with this (very slowly)
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return 0
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return int(headphones.CONFIG.CACHE_SIZEMB)
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class DBConnection:
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def __init__(self, filename="headphones.db"):
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self.filename = filename
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self.connection = sqlite3.connect(dbFilename(filename), timeout=20)
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# don't wait for the disk to finish writing
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self.connection.execute("PRAGMA synchronous = OFF")
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# journal disabled since we never do rollbacks
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self.connection.execute("PRAGMA journal_mode = %s" % headphones.CONFIG.JOURNAL_MODE)
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# 64mb of cache memory,probably need to make it user configurable
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self.connection.execute("PRAGMA cache_size=-%s" % (getCacheSize() * 1024))
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self.connection.row_factory = sqlite3.Row
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def action(self, query, args=None):
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if query is None:
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return
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sqlResult = None
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try:
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with self.connection as c:
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if args is None:
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sqlResult = c.execute(query)
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else:
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sqlResult = c.execute(query, args)
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except sqlite3.OperationalError, e:
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if "unable to open database file" in e.message or "database is locked" in e.message:
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logger.warn('Database Error: %s', e)
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else:
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logger.error('Database error: %s', e)
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raise
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except sqlite3.DatabaseError, e:
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logger.error('Fatal Error executing %s :: %s', query, e)
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raise
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return sqlResult
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def select(self, query, args=None):
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sqlResults = self.action(query, args).fetchall()
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if sqlResults is None or sqlResults == [None]:
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return []
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return sqlResults
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def upsert(self, tableName, valueDict, keyDict):
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def genParams(myDict):
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return [x + " = ?" for x in myDict.keys()]
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changesBefore = self.connection.total_changes
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update_query = "UPDATE " + tableName + " SET " + ", ".join(
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genParams(valueDict)) + " WHERE " + " AND ".join(genParams(keyDict))
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self.action(update_query, valueDict.values() + keyDict.values())
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if self.connection.total_changes == changesBefore:
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insert_query = (
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"INSERT INTO " + tableName + " (" + ", ".join(
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valueDict.keys() + keyDict.keys()) + ")" +
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" VALUES (" + ", ".join(["?"] * len(valueDict.keys() + keyDict.keys())) + ")"
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)
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try:
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self.action(insert_query, valueDict.values() + keyDict.values())
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except sqlite3.IntegrityError:
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logger.info('Queries failed: %s and %s', update_query, insert_query)
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