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Copy pathushuffle_db.py
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executable file
·174 lines (146 loc) · 4.43 KB
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#!/usr/bin/env python
import os
from random import randrange as rrange
COLSIZ = 10
RDBMSs = {'s': 'sqlite', 'm': 'mysql', 'g': 'gadfly'}
DB_EXC = None
def setup():
return RDBMSs[raw_input('''
Choose a database system:
(M)ySQL
(G)adfly
(S)QLite
Enter choice: ''').strip().lower()[0]]
def connect(db, dbName):
global DB_EXC
dbDir = '%s_%s' % (db, dbName)
if db == 'sqlite':
try:
import sqlite3
except ImportError, e:
try:
from pysqlite2 import dbapi2 as sqlite3
except ImportError, e:
return None
DB_EXC = sqlite3
if not os.path.isdir(dbDir):
os.mkdir(dbDir)
cxn = sqlite3.connect(os.path.join(dbDir, dbName))
elif db == 'mysql':
try:
import MySQLdb
import _mysql_exceptions as DB_EXC
except ImportError, e:
return None
try:
cxn = MySQLdb.connect(db=dbName)
except DB_EXC.OperationalError, e:
cxn = MySQLdb.connect(user='root')
try:
cxn.query('DROP DATABASE %s' % dbName)
except DB_EXC.OperationalError, e:
pass
cxn.query('CREATE DATABASE %s' % dbName)
cxn.query("GRANT ALL ON %s.* to ''@'localhost'" % dbName)
cxn.commit()
cxn.close()
cxn = MySQLdb.connect(db=dbName)
elif db == 'gadfly':
try:
from gadfly import gadfly
DB_EXC = gadfly
except ImportError, e:
return None
try:
cxn = gadfly(dbName, dbDir)
except IOError, e:
cxn = gadfly()
if not os.path.isdir(dbDir):
os.mkdir(dbDir)
cxn.startup(dbName, dbDir)
else:
return None
return cxn
def create(cur):
try:
cur.execute('''
CREATE TABLE users (
login VARCHAR(8),
uid INTEGER,
prid INTEGER)
''')
except DB_EXC.OperationalError, e:
drop(cur)
create(cur)
drop = lambda cur: cur.execute('DROP TABLE users')
NAMES = (
('aaron', 8312), ('angela', 7603), ('dave', 7306),
('davina',7902), ('elliot', 7911), ('ernie', 7410),
('jess', 7912), ('jim', 7512), ('larry', 7311),
('leslie', 7808), ('melissa', 8602), ('pat', 7711),
('serena', 7003), ('stan', 7607), ('faye', 6812),
('amy', 7209),
)
def randName():
pick = list(NAMES)
while len(pick) > 0:
yield pick.pop(rrange(len(pick)))
def insert(cur, db):
if db == 'sqlite':
cur.executemany("INSERT INTO users VALUES(?, ?, ?)",
[(who, uid, rrange(1,5)) for who, uid in randName()])
elif db == 'gadfly':
for who, uid in randName():
cur.execute("INSERT INTO users VALUES(?, ?, ?)",
(who, uid, rrange(1,5)))
elif db == 'mysql':
cur.executemany("INSERT INTO users VALUES(%s, %s, %s)",
[(who, uid, rrange(1,5)) for who, uid in randName()])
getRC = lambda cur: cur.rowcount if hasattr(cur, 'rowcount') else -1
def update(cur):
fr = rrange(1,5)
to = rrange(1,5)
cur.execute(
"UPDATE users SET prid=%d WHERE prid=%d" % (to, fr))
return fr, to, getRC(cur)
def delete(cur):
rm = rrange(1,5)
cur.execute('DELETE FROM users WHERE prid=%d' % rm)
return rm, getRC(cur)
def dbDump(cur):
cur.execute('SELECT * FROM users')
print '\n%s%s%s' % ('LOGIN'.ljust(COLSIZ),
'USERID'.ljust(COLSIZ), 'PROJ#'.ljust(COLSIZ))
for data in cur.fetchall():
print '%s%s%s' % tuple([str(s).title().ljust(COLSIZ) \
for s in data])
def main():
db = setup()
print '*** Connecting to %r database' % db
cxn = connect(db, 'test')
if not cxn:
print '\nERROR: %r not supported, exiting' % db
return
cur = cxn.cursor()
print '\n*** Creating users table'
create(cur)
print '\n*** Inserting names into table'
insert(cur, db)
dbDump(cur)
print '\n*** Randomly moving folks',
fr, to, num = update(cur)
print 'from one group (%d) to another (%d)' % (fr, to)
print '\t(%d users moved)' % num
dbDump(cur)
print '\n*** Randomly choosing group',
rm, num = delete(cur)
print '(%d) to delete' % rm
print '\t(%d users removed)' % num
dbDump(cur)
print '\n*** Dropping users table'
drop(cur)
cur.close()
cxn.commit()
cxn.close()
if __name__ == '__main__':
main()