fpdb/pyfpdb/fpdb_db.py

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#!/usr/bin/python
# -*- coding: utf-8 -*-
#Copyright 2008 Steffen Jobbagy-Felso
#This program is free software: you can redistribute it and/or modify
#it under the terms of the GNU Affero General Public License as published by
#the Free Software Foundation, version 3 of the License.
#
#This program 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 Affero General Public License
#along with this program. If not, see <http://www.gnu.org/licenses/>.
#In the "official" distribution you can find the license in
#agpl-3.0.txt in the docs folder of the package.
import os
import re
import sys
import logging
from time import time, strftime
from Exceptions import *
try:
import sqlalchemy.pool as pool
use_pool = True
except ImportError:
logging.info("Not using sqlalchemy connection pool.")
use_pool = False
import fpdb_simple
import FpdbSQLQueries
class fpdb_db:
MYSQL_INNODB = 2
PGSQL = 3
SQLITE = 4
sqlite_db_dir = ".." + os.sep + "database"
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def __init__(self):
"""Simple constructor, doesnt really do anything"""
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self.db = None
self.cursor = None
self.sql = {}
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#end def __init__
def do_connect(self, config=None):
"""Connects a database using information in config"""
if config is None:
raise FpdbError('Configuration not defined')
self.settings = {}
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self.settings['os'] = "linuxmac" if os.name != "nt" else "windows"
db = config.get_db_parameters()
self.connect(backend=db['db-backend'],
host=db['db-host'],
database=db['db-databaseName'],
user=db['db-user'],
password=db['db-password'])
#end def do_connect
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def connect(self, backend=None, host=None, database=None,
user=None, password=None):
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"""Connects a database with the given parameters"""
if backend is None:
raise FpdbError('Database backend not defined')
self.backend = backend
self.host = host
self.user = user
self.password = password
self.database = database
if backend == fpdb_db.MYSQL_INNODB:
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import MySQLdb
if use_pool:
MySQLdb = pool.manage(MySQLdb, pool_size=5)
try:
self.db = MySQLdb.connect(host = host, user = user, passwd = password, db = database, use_unicode=True)
except:
raise FpdbMySQLFailedError("MySQL connection failed")
elif backend==fpdb_db.PGSQL:
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import psycopg2
import psycopg2.extensions
if use_pool:
psycopg2 = pool.manage(psycopg2, pool_size=5)
psycopg2.extensions.register_type(psycopg2.extensions.UNICODE)
# If DB connection is made over TCP, then the variables
# host, user and password are required
# For local domain-socket connections, only DB name is
# needed, and everything else is in fact undefined and/or
# flat out wrong
# sqlcoder: This database only connect failed in my windows setup??
# Modifed it to try the 4 parameter style if the first connect fails - does this work everywhere?
connected = False
if self.host == "localhost" or self.host == "127.0.0.1":
try:
self.db = psycopg2.connect(database = database)
connected = True
except:
pass
#msg = "PostgreSQL direct connection to database (%s) failed, trying with user ..." % (database,)
#print msg
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#raise FpdbError(msg)
if not connected:
try:
self.db = psycopg2.connect(host = host,
user = user,
password = password,
database = database)
except:
msg = "PostgreSQL connection to database (%s) user (%s) failed. Are you sure the DB is running?" % (database, user)
print msg
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raise FpdbError(msg)
elif backend == fpdb_db.SQLITE:
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logging.info("Connecting to SQLite:%(database)s" % {'database':database})
import sqlite3
if use_pool:
sqlite3 = pool.manage(sqlite3, pool_size=1)
else:
logging.warning("SQLite won't work well without 'sqlalchemy' installed.")
if not os.path.isdir(self.sqlite_db_dir):
print "Creating directory: '%s'" % (self.sqlite_db_dir)
os.mkdir(self.sqlite_db_dir)
self.db = sqlite3.connect( self.sqlite_db_dir + os.sep + database
, detect_types=sqlite3.PARSE_DECLTYPES )
sqlite3.register_converter("bool", lambda x: bool(int(x)))
sqlite3.register_adapter(bool, lambda x: "1" if x else "0")
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else:
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raise FpdbError("unrecognised database backend:"+backend)
self.cursor = self.db.cursor()
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# Set up query dictionary as early in the connection process as we can.
self.sql = FpdbSQLQueries.FpdbSQLQueries(self.get_backend_name())
self.cursor.execute(self.sql.query['set tx level'])
self.wrongDbVersion = False
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try:
self.cursor.execute("SELECT * FROM Settings")
settings = self.cursor.fetchone()
if settings[0] != 118:
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print "outdated or too new database version - please recreate tables"
self.wrongDbVersion = True
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except:# _mysql_exceptions.ProgrammingError:
if database != ":memory:": print "failed to read settings table - please recreate tables"
self.wrongDbVersion = True
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#end def connect
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def disconnect(self, due_to_error=False):
"""Disconnects the DB"""
if due_to_error:
self.db.rollback()
else:
self.db.commit()
self.cursor.close()
self.db.close()
#end def disconnect
def reconnect(self, due_to_error=False):
"""Reconnects the DB"""
#print "started fpdb_db.reconnect"
self.disconnect(due_to_error)
self.connect(self.backend, self.host, self.database, self.user, self.password)
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def get_backend_name(self):
"""Returns the name of the currently used backend"""
if self.backend==2:
return "MySQL InnoDB"
elif self.backend==3:
return "PostgreSQL"
elif self.backend==4:
return "SQLite"
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else:
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raise FpdbError("invalid backend")
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#end def get_backend_name
def get_db_info(self):
return (self.host, self.database, self.user, self.password)
#end def get_db_info
#end class fpdb_db