fpdb/pyfpdb/fpdb_db.py
2008-10-08 01:50:43 +08:00

181 lines
6.5 KiB
Python

#!/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print "outdated or too new database version - please recreate tables"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 create_table(self, string):
"""creates a table for the given string
The string should the name of the table followed by the column list
in brackets as if it were an SQL command. Do NOT include the "CREATE TABLES"
bit at the beginning nor the ";" or ENGINE= at the end"""
string="CREATE TABLE "+string
if (self.backend==self.MYSQL_INNODB):
string+=" ENGINE=INNODB"
string+=";"
#print "create_table, string:", string
self.cursor.execute(string)
self.db.commit()
#end def create_table
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()
#end def disconnect
def drop_tables(self):
"""Drops the fpdb tables from the current db"""
if(self.get_backend_name() == 'MySQL InnoDB'):
# Query the DB to see what tables exist
self.cursor.execute('SHOW TABLES')
#Databases with FOREIGN KEY support need this switched of before you can drop tables
self.drop_referencial_integrity()
for table in self.cursor:
self.cursor.execute(self.sql.query['drop_table'] + table[0])
elif(self.get_backend_name() == 'PostgreSQL'):
#todo: postgres version here
print "Empty function here"
elif(self.get_backend_name() == 'SQLite'):
#todo: sqlite version here
print "Empty function here"
#end def drop_tables
def drop_referencial_integrity(self):
"""Update all tables to remove foreign keys"""
self.cursor.execute('SHOW TABLES') # todo: move to FpdbSQLQueries
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