mirror of
https://github.com/psycopg/psycopg2.git
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77 lines
2.9 KiB
Python
77 lines
2.9 KiB
Python
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import psycopg2
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import unittest
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import tests
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from psycopg2.extensions import (
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ISOLATION_LEVEL_SERIALIZABLE, STATUS_BEGIN, STATUS_READY)
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class TransactionTestCase(unittest.TestCase):
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def setUp(self):
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self.conn = psycopg2.connect("dbname=%s" % tests.dbname)
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self.conn.set_isolation_level(ISOLATION_LEVEL_SERIALIZABLE)
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curs = self.conn.cursor()
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curs.execute('''
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CREATE TEMPORARY TABLE table1 (
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id int PRIMARY KEY
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)''')
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# The constraint is set to deferrable for the commit_failed test
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curs.execute('''
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CREATE TEMPORARY TABLE table2 (
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id int PRIMARY KEY,
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table1_id int,
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CONSTRAINT table2__table1_id__fk
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FOREIGN KEY (table1_id) REFERENCES table1(id) DEFERRABLE)''')
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curs.execute('INSERT INTO table1 VALUES (1)')
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curs.execute('INSERT INTO table2 VALUES (1, 1)')
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self.conn.commit()
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def tearDown(self):
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self.conn.close()
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def test_rollback(self):
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# Test that rollback undoes changes
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curs = self.conn.cursor()
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curs.execute('INSERT INTO table2 VALUES (2, 1)')
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# Rollback takes us from BEGIN state to READY state
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self.assertEqual(self.conn.status, STATUS_BEGIN)
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self.conn.rollback()
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self.assertEqual(self.conn.status, STATUS_READY)
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curs.execute('SELECT id, table1_id FROM table2 WHERE id = 2')
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self.assertEqual(curs.fetchall(), [])
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def test_commit(self):
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# Test that commit stores changes
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curs = self.conn.cursor()
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curs.execute('INSERT INTO table2 VALUES (2, 1)')
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# Rollback takes us from BEGIN state to READY state
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self.assertEqual(self.conn.status, STATUS_BEGIN)
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self.conn.commit()
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self.assertEqual(self.conn.status, STATUS_READY)
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# Now rollback and show that the new record is still there:
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self.conn.rollback()
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curs.execute('SELECT id, table1_id FROM table2 WHERE id = 2')
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self.assertEqual(curs.fetchall(), [(2, 1)])
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def test_failed_commit(self):
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# Test that we can recover from a failed commit.
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# We use a deferred constraint to cause a failure on commit.
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curs = self.conn.cursor()
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curs.execute('SET CONSTRAINTS table2__table1_id__fk DEFERRED')
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curs.execute('INSERT INTO table2 VALUES (2, 42)')
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# The commit should fail, and move the cursor back to READY state
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self.assertEqual(self.conn.status, STATUS_BEGIN)
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self.assertRaises(psycopg2.OperationalError, self.conn.commit)
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self.assertEqual(self.conn.status, STATUS_READY)
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# The connection should be ready to use for the next transaction:
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curs.execute('SELECT 1')
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self.assertEqual(curs.fetchone()[0], 1)
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def test_suite():
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return unittest.TestLoader().loadTestsFromName(__name__)
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if __name__ == "__main__":
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unittest.main()
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