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test_capabilities.py    290 lines (251 with data), 9.9 kB

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#!/usr/bin/env python -O
""" Script to test database capabilities and the DB-API interface
for functionality and memory leaks.
Adapted from a script by M-A Lemburg.
"""
from time import time
import array
import unittest
class DatabaseTest(unittest.TestCase):
db_module = None
connect_args = ()
connect_kwargs = dict()
create_table_extra = ''
rows = 10
debug = False
def setUp(self):
import gc
db = self.db_module.connect(*self.connect_args, **self.connect_kwargs)
self.connection = db
self.cursor = db.cursor()
self.BLOBText = ''.join([chr(i) for i in range(256)] * 100);
self.BLOBUText = u''.join([unichr(i) for i in range(16384)])
self.BLOBBinary = self.db_module.Binary(''.join([chr(i) for i in range(256)] * 16))
leak_test = True
def tearDown(self):
if self.leak_test:
import gc
del self.cursor
orphans = gc.collect()
self.failIf(orphans, "%d orphaned objects found after deleting cursor" % orphans)
del self.connection
orphans = gc.collect()
self.failIf(orphans, "%d orphaned objects found after deleting connection" % orphans)
def table_exists(self, name):
try:
self.cursor.execute('select * from %s where 1=0' % name)
except:
return False
else:
return True
def quote_identifier(self, ident):
return '"%s"' % ident
def new_table_name(self):
i = id(self.cursor)
while True:
name = self.quote_identifier('tb%08x' % i)
if not self.table_exists(name):
return name
i = i + 1
def create_table(self, columndefs):
""" Create a table using a list of column definitions given in
columndefs.
generator must be a function taking arguments (row_number,
col_number) returning a suitable data object for insertion
into the table.
"""
self.table = self.new_table_name()
self.cursor.execute('CREATE TABLE %s (%s) %s' %
(self.table,
',\n'.join(columndefs),
self.create_table_extra))
def check_data_integrity(self, columndefs, generator):
# insert
self.create_table(columndefs)
insert_statement = ('INSERT INTO %s VALUES (%s)' %
(self.table,
','.join(['%s'] * len(columndefs))))
data = [ [ generator(i,j) for j in range(len(columndefs)) ]
for i in range(self.rows) ]
if self.debug:
print data
self.cursor.executemany(insert_statement, data)
self.connection.commit()
# verify
self.cursor.execute('select * from %s' % self.table)
l = self.cursor.fetchall()
if self.debug:
print l
self.assertEquals(len(l), self.rows)
try:
for i in range(self.rows):
for j in range(len(columndefs)):
self.assertEquals(l[i][j], generator(i,j))
finally:
if not self.debug:
self.cursor.execute('drop table %s' % (self.table))
def test_transactions(self):
columndefs = ( 'col1 INT', 'col2 VARCHAR(255)')
def generator(row, col):
if col == 0: return row
else: return ('%i' % (row%10))*255
self.create_table(columndefs)
insert_statement = ('INSERT INTO %s VALUES (%s)' %
(self.table,
','.join(['%s'] * len(columndefs))))
data = [ [ generator(i,j) for j in range(len(columndefs)) ]
for i in range(self.rows) ]
self.cursor.executemany(insert_statement, data)
# verify
self.connection.commit()
self.cursor.execute('select * from %s' % self.table)
l = self.cursor.fetchall()
self.assertEquals(len(l), self.rows)
for i in range(self.rows):
for j in range(len(columndefs)):
self.assertEquals(l[i][j], generator(i,j))
delete_statement = 'delete from %s where col1=%%s' % self.table
self.cursor.execute(delete_statement, (0,))
self.cursor.execute('select col1 from %s where col1=%s' % \
(self.table, 0))
l = self.cursor.fetchall()
self.failIf(l, "DELETE didn't work")
self.connection.rollback()
self.cursor.execute('select col1 from %s where col1=%s' % \
(self.table, 0))
l = self.cursor.fetchall()
self.failUnless(len(l) == 1, "ROLLBACK didn't work")
self.cursor.execute('drop table %s' % (self.table))
def test_truncation(self):
columndefs = ( 'col1 INT', 'col2 VARCHAR(255)')
def generator(row, col):
if col == 0: return row
else: return ('%i' % (row%10))*((255-self.rows/2)+row)
self.create_table(columndefs)
insert_statement = ('INSERT INTO %s VALUES (%s)' %
(self.table,
','.join(['%s'] * len(columndefs))))
try:
self.cursor.execute(insert_statement, (0, '0'*256))
except Warning:
if self.debug: print self.cursor.messages
except self.connection.DataError:
pass
else:
self.fail("Over-long column did not generate warnings/exception with single insert")
self.connection.rollback()
try:
for i in range(self.rows):
data = []
for j in range(len(columndefs)):
data.append(generator(i,j))
self.cursor.execute(insert_statement,tuple(data))
except Warning:
if self.debug: print self.cursor.messages
except self.connection.DataError:
pass
else:
self.fail("Over-long columns did not generate warnings/exception with execute()")
self.connection.rollback()
try:
data = [ [ generator(i,j) for j in range(len(columndefs)) ]
for i in range(self.rows) ]
self.cursor.executemany(insert_statement, data)
except Warning:
if self.debug: print self.cursor.messages
except self.connection.DataError:
pass
else:
self.fail("Over-long columns did not generate warnings/exception with executemany()")
self.connection.rollback()
self.cursor.execute('drop table %s' % (self.table))
def test_CHAR(self):
# Character data
def generator(row,col):
return ('%i' % ((row+col) % 10)) * 255
self.check_data_integrity(
('col1 char(255)','col2 char(255)'),
generator)
def test_INT(self):
# Number data
def generator(row,col):
return row*row
self.check_data_integrity(
('col1 INT',),
generator)
def test_DECIMAL(self):
# DECIMAL
def generator(row,col):
from decimal import Decimal
return Decimal("%d.%02d" % (row, col))
self.check_data_integrity(
('col1 DECIMAL(5,2)',),
generator)
def test_DATE(self):
ticks = time()
def generator(row,col):
return self.db_module.DateFromTicks(ticks+row*86400-col*1313)
self.check_data_integrity(
('col1 DATE',),
generator)
def test_TIME(self):
ticks = time()
def generator(row,col):
return self.db_module.TimeFromTicks(ticks+row*86400-col*1313)
self.check_data_integrity(
('col1 TIME',),
generator)
def test_DATETIME(self):
ticks = time()
def generator(row,col):
return self.db_module.TimestampFromTicks(ticks+row*86400-col*1313)
self.check_data_integrity(
('col1 DATETIME',),
generator)
def test_TIMESTAMP(self):
ticks = time()
def generator(row,col):
return self.db_module.TimestampFromTicks(ticks+row*86400-col*1313)
self.check_data_integrity(
('col1 TIMESTAMP',),
generator)
def test_fractional_TIMESTAMP(self):
ticks = time()
def generator(row,col):
return self.db_module.TimestampFromTicks(ticks+row*86400-col*1313+row*0.7*col/3.0)
self.check_data_integrity(
('col1 TIMESTAMP',),
generator)
def test_LONG(self):
def generator(row,col):
if col == 0:
return row
else:
return self.BLOBUText # 'BLOB Text ' * 1024
self.check_data_integrity(
('col1 INT','col2 LONG'),
generator)
def test_TEXT(self):
def generator(row,col):
return self.BLOBUText # 'BLOB Text ' * 1024
self.check_data_integrity(
('col2 TEXT',),
generator)
def test_LONG_BYTE(self):
def generator(row,col):
if col == 0:
return row
else:
return self.BLOBBinary # 'BLOB\000Binary ' * 1024
self.check_data_integrity(
('col1 INT','col2 LONG BYTE'),
generator)
def test_BLOB(self):
def generator(row,col):
if col == 0:
return row
else:
return self.BLOBBinary # 'BLOB\000Binary ' * 1024
self.check_data_integrity(
('col1 INT','col2 BLOB'),
generator)