#!/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 . #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 try: from numpy import var use_numpy = True except ImportError: logging.info("Not using numpy to define variance in sqlite.") use_numpy = False import fpdb_simple import FpdbSQLQueries import Configuration # Variance created as sqlite has a bunch of undefined aggregate functions. class VARIANCE: def __init__(self): self.store = [] def step(self, value): self.store.append(value) def finalize(self): return float(var(self.store)) class fpdb_db: MYSQL_INNODB = 2 PGSQL = 3 SQLITE = 4 def __init__(self): """Simple constructor, doesnt really do anything""" self.db = None self.cursor = None self.sql = {} #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 = {} 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 def connect(self, backend=None, host=None, database=None, user=None, password=None): """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: 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) #TODO: Add port option # except: # raise FpdbMySQLFailedError("MySQL connection failed") elif backend==fpdb_db.PGSQL: 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 #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 raise FpdbError(msg) elif backend == fpdb_db.SQLITE: 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(Configuration.DIR_DATABASES): print "Creating directory: '%s'" % (Configuration.DIR_DATABASES) os.mkdir(Configuration.DIR_DATABASES) self.db = sqlite3.connect( os.path.join(Configuration.DIR_DATABASES, 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") if use_numpy: self.db.create_aggregate("variance", 1, VARIANCE) else: logging.warning("Some database functions will not work without NumPy support") else: raise FpdbError("unrecognised database backend:"+backend) self.cursor = self.db.cursor() # 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 try: self.cursor.execute("SELECT * FROM Settings") settings = self.cursor.fetchone() if settings[0] != 118: print "outdated or too new database version - please recreate tables" self.wrongDbVersion = True except:# _mysql_exceptions.ProgrammingError: if database != ":memory:": print "failed to read settings table - please recreate tables" self.wrongDbVersion = True #end def connect 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) 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" else: raise FpdbError("invalid backend") #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