fpdb/pyfpdb/fpdb_db.py
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2008-10-28 09:37:11 -04:00

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#!/usr/bin/python
#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 fpdb_simple
import FpdbSQLQueries
class fpdb_db:
def __init__(self):
"""Simple constructor, doesnt really do anything"""
self.db=None
self.cursor=None
self.sql = {}
self.MYSQL_INNODB=2
self.PGSQL=3
self.SQLITE=4
#end def __init__
def connect(self, backend, host, database, user, password):
"""Connects a database with the given parameters"""
self.backend=backend
self.host=host
self.database=database
self.user=user
self.password=password
if backend==self.MYSQL_INNODB:
import MySQLdb
self.db=MySQLdb.connect(host = host, user = user, passwd = password, db = database)
elif backend==self.PGSQL:
import psycopg2
self.db = psycopg2.connect(host = host, user = user, password = password, database = database)
else:
raise fpdb_simple.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.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print "outdated or too new database version - please recreate tables"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:
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 create_tables(self):
#todo: should detect and fail gracefully if tables already exist.
self.cursor.execute(self.sql.query['createSettingsTable'])
self.cursor.execute(self.sql.query['createSitesTable'])
self.cursor.execute(self.sql.query['createGametypesTable'])
self.cursor.execute(self.sql.query['createPlayersTable'])
self.cursor.execute(self.sql.query['createAutoratesTable'])
self.cursor.execute(self.sql.query['createHandsTable'])
self.cursor.execute(self.sql.query['createBoardCardsTable'])
self.cursor.execute(self.sql.query['createTourneyTypesTable'])
self.cursor.execute(self.sql.query['createTourneysTable'])
self.cursor.execute(self.sql.query['createTourneysPlayersTable'])
self.cursor.execute(self.sql.query['createHandsPlayersTable'])
self.cursor.execute(self.sql.query['createHandsActionsTable'])
self.cursor.execute(self.sql.query['createHudCacheTable'])
self.fillDefaultData()
self.db.commit()
#end def disconnect
def drop_tables(self):
"""Drops the fpdb tables from the current db"""
if(self.get_backend_name() == 'MySQL InnoDB'):
#Databases with FOREIGN KEY support need this switched of before you can drop tables
self.drop_referencial_integrity()
# Query the DB to see what tables exist
self.cursor.execute(self.sql.query['list_tables'])
for table in self.cursor:
self.cursor.execute(self.sql.query['drop_table'] + table[0])
elif(self.get_backend_name() == 'PostgreSQL'):
self.db.commit()# I have no idea why this makes the query work--REB 07OCT2008
self.cursor.execute(self.sql.query['list_tables'])
tables = self.cursor.fetchall()
for table in tables:
self.cursor.execute(self.sql.query['drop_table'] + table[0] + ' cascade')
elif(self.get_backend_name() == 'SQLite'):
#todo: sqlite version here
print "Empty function here"
self.db.commit()
#end def drop_tables
def drop_referencial_integrity(self):
"""Update all tables to remove foreign keys"""
self.cursor.execute(self.sql.query['list_tables'])
result = self.cursor.fetchall()
for i in range(len(result)):
self.cursor.execute("SHOW CREATE TABLE " + result[i][0])
inner = self.cursor.fetchall()
for j in range(len(inner)):
# result[i][0] - Table name
# result[i][1] - CREATE TABLE parameters
#Searching for CONSTRAINT `tablename_ibfk_1`
for m in re.finditer('(ibfk_[0-9]+)', inner[j][1]):
key = "`" + inner[j][0] + "_" + m.group() + "`"
self.cursor.execute("ALTER TABLE " + inner[j][0] + " DROP FOREIGN KEY " + key)
self.db.commit()
#end drop_referencial_inegrity
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"
else:
raise fpdb_simple.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
def fillDefaultData(self):
self.cursor.execute("INSERT INTO Settings VALUES (118);")
self.cursor.execute("INSERT INTO Sites VALUES (DEFAULT, 'Full Tilt Poker', 'USD');")
self.cursor.execute("INSERT INTO Sites VALUES (DEFAULT, 'PokerStars', 'USD');")
self.cursor.execute("INSERT INTO TourneyTypes VALUES (DEFAULT, 1, 0, 0, 0, False);")
#end def fillDefaultData
def recreate_tables(self):
"""(Re-)creates the tables of the current DB"""
self.drop_tables()
self.create_tables()
self.db.commit()
print "Finished recreating tables"
#end def recreate_tables
#end class fpdb_db