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#!/usr/bin/env python
#
# Public Domain 2008-2013 WiredTiger, Inc.
#
# This is free and unencumbered software released into the public domain.
#
# Anyone is free to copy, modify, publish, use, compile, sell, or
# distribute this software, either in source code form or as a compiled
# binary, for any purpose, commercial or non-commercial, and by any
# means.
#
# In jurisdictions that recognize copyright laws, the author or authors
# of this software dedicate any and all copyright interest in the
# software to the public domain. We make this dedication for the benefit
# of the public at large and to the detriment of our heirs and
# successors. We intend this dedication to be an overt act of
# relinquishment in perpetuity of all present and future rights to this
# software under copyright law.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
# IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
# OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
# ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
# OTHER DEALINGS IN THE SOFTWARE.
import wiredtiger, wttest
from helper import complex_populate, simple_populate
# test_cursor_random.py
# Cursor next_random operations
class test_cursor_random(wttest.WiredTigerTestCase):
scenarios = [
('file', dict(type='file:',fmt='S')),
('table', dict(type='table:',fmt='S'))
]
# Check that opening a random cursor on a row-store returns not-supported
# for every method except for next and reset, and next returns not-found.
def test_cursor_random_column(self):
uri = self.type + 'random'
self.session.create(uri, 'key_format=' + self.fmt + ',value_format=S')
cursor = self.session.open_cursor(uri, None, "next_random=true")
self.assertRaises(
wiredtiger.WiredTigerError, lambda: cursor.compare(cursor))
self.assertRaises(wiredtiger.WiredTigerError, lambda: cursor.prev())
self.assertRaises(wiredtiger.WiredTigerError, lambda: cursor.search())
self.assertRaises(
wiredtiger.WiredTigerError, lambda: cursor.search_near())
self.assertRaises(wiredtiger.WiredTigerError, lambda: cursor.insert())
self.assertRaises(wiredtiger.WiredTigerError, lambda: cursor.update())
self.assertRaises(wiredtiger.WiredTigerError, lambda: cursor.remove())
cursor.reset()
self.assertTrue(cursor.next(), wiredtiger.WT_NOTFOUND)
cursor.close()
# Check that next_random works with a single value, repeatedly.
def test_cursor_random_single_record(self):
uri = self.type + 'random'
self.session.create(uri, 'key_format=' + self.fmt + ',value_format=S')
cursor = self.session.open_cursor(uri, None)
cursor.set_key('AAA')
cursor.set_value('BBB')
cursor.insert()
cursor.close
cursor = self.session.open_cursor(uri, None, "next_random=true")
for i in range(1,5):
cursor.next()
self.assertEquals(cursor.get_key(), 'AAA')
cursor.close
# Check that next_random works in the presence of a larger set of values.
def test_cursor_random_multiple_records(self):
uri = self.type + 'random'
if self.type == 'file:':
simple_populate(self, uri,
'allocation_size=512,leaf_page_max=512,key_format=' +\
self.fmt, 10000)
else:
complex_populate(self, uri,
'allocation_size=512,leaf_page_max=512,key_format=' +\
self.fmt, 10000)
# Close the connection so everything is forced to disk (otherwise the
# values are on an insert list and the underlying engine doesn't make
# random selections, it selects the middle of the list.
self.conn.close()
self.conn = self.setUpConnectionOpen(".")
self.session = self.conn.open_session()
cursor = self.session.open_cursor(uri, None, "next_random=true")
last = ''
match = 0
for i in range(1,10):
cursor.next()
current = cursor.get_key()
if current == last:
match += 1
last = current
self.assertLess(match, 5,
'next_random did not return random records, too many matches found')
# Check that opening a random cursor on column-store returns not-supported.
class test_cursor_random_column(wttest.WiredTigerTestCase):
scenarios = [
('file', dict(uri='file:random',fmt='r')),
('table', dict(uri='table:random',fmt='r')),
]
def test_cursor_random_column(self):
self.session.create(
self.uri, 'key_format=' + self.fmt + ',value_format=S')
cursor = self.session.open_cursor(self.uri, None, "next_random=true")
self.assertRaises(wiredtiger.WiredTigerError, lambda: cursor.next())
cursor.close()
if __name__ == '__main__':
wttest.run()
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