Python engines.testing_engine函数代码示例

    def test_engine_param_stays(self):

        eng = testing_engine()
        isolation_level = eng.dialect.get_isolation_level(eng.connect().connection)
        level = self._non_default_isolation_level()

        ne_(isolation_level, level)

        eng = testing_engine(options=dict(isolation_level=level))
        eq_(
            eng.dialect.get_isolation_level(eng.connect().connection),
            level
        )

        # check that it stays
        conn = eng.connect()
        eq_(
            eng.dialect.get_isolation_level(conn.connection),
            level
        )
        conn.close()

        conn = eng.connect()
        eq_(
            eng.dialect.get_isolation_level(conn.connection),
            level
        )
        conn.close()

    def test_bind_arguments(self):
        users, Address, addresses, User = (
            self.tables.users,
            self.classes.Address,
            self.tables.addresses,
            self.classes.User,
        )

        mapper(User, users)
        mapper(Address, addresses)

        e1 = engines.testing_engine()
        e2 = engines.testing_engine()
        e3 = engines.testing_engine()

        sess = Session(e3)
        sess.bind_mapper(User, e1)
        sess.bind_mapper(Address, e2)

        assert sess.connection().engine is e3
        assert sess.connection(bind=e1).engine is e1
        assert sess.connection(mapper=Address, bind=e1).engine is e1
        assert sess.connection(mapper=Address).engine is e2
        assert sess.connection(clause=addresses.select()).engine is e2
        assert sess.connection(mapper=User, clause=addresses.select()).engine is e1
        assert sess.connection(mapper=User, clause=addresses.select(), bind=e2).engine is e2

        sess.close()

    def test_native_odbc_execute(self):
        t1 = Table('t1', MetaData(), Column('c1', Integer))
        dbapi = MockDBAPI()
        engine = engines.testing_engine('mssql+mxodbc://localhost',
                options={'module': dbapi, '_initialize': False})
        conn = engine.connect()

        # crud: uses execute

        conn.execute(t1.insert().values(c1='foo'))
        conn.execute(t1.delete().where(t1.c.c1 == 'foo'))
        conn.execute(t1.update().where(t1.c.c1 == 'foo').values(c1='bar'
                     ))

        # select: uses executedirect

        conn.execute(t1.select())

        # manual flagging

        conn.execution_options(native_odbc_execute=True).\
                execute(t1.select())
        conn.execution_options(native_odbc_execute=False).\
                execute(t1.insert().values(c1='foo'
                ))
        eq_(dbapi.log, [
            'execute',
            'execute',
            'execute',
            'executedirect',
            'execute',
            'executedirect',
            ])

    def test_per_connection(self):
        from sqlalchemy.pool import QueuePool
        eng = testing_engine(options=dict(
                                poolclass=QueuePool,
                                pool_size=2, max_overflow=0))

        c1 = eng.connect()
        c1 = c1.execution_options(
                    isolation_level=self._non_default_isolation_level()
                )
        c2 = eng.connect()
        eq_(
            eng.dialect.get_isolation_level(c1.connection),
            self._non_default_isolation_level()
        )
        eq_(
            eng.dialect.get_isolation_level(c2.connection),
            self._default_isolation_level()
        )
        c1.close()
        c2.close()
        c3 = eng.connect()
        eq_(
            eng.dialect.get_isolation_level(c3.connection),
            self._default_isolation_level()
        )
        c4 = eng.connect()
        eq_(
            eng.dialect.get_isolation_level(c4.connection),
            self._default_isolation_level()
        )

        c3.close()
        c4.close()

        def go():
            engine = engines.testing_engine(
                                options={'logging_name':'FOO',
                                        'pool_logging_name':'BAR',
                                        'use_reaper':False}
                                    )
            sess = create_session(bind=engine)

            a1 = A(col2="a1")
            a2 = A(col2="a2")
            a3 = A(col2="a3")
            a1.bs.append(B(col2="b1"))
            a1.bs.append(B(col2="b2"))
            a3.bs.append(B(col2="b3"))
            for x in [a1,a2,a3]:
                sess.add(x)
            sess.flush()
            sess.expunge_all()

            alist = sess.query(A).all()
            eq_(
                [
                    A(col2="a1", bs=[B(col2="b1"), B(col2="b2")]),
                    A(col2="a2", bs=[]),
                    A(col2="a3", bs=[B(col2="b3")])
                ],
                alist)

            for a in alist:
                sess.delete(a)
            sess.flush()
            sess.close()
            engine.dispose()

    def test_retval_flag(self):
        canary = []
        def tracker(name):
            def go(conn, *args, **kw):
                canary.append(name)
            return go

        def execute(conn, clauseelement, multiparams, params):
            canary.append('execute')
            return clauseelement, multiparams, params

        def cursor_execute(conn, cursor, statement, 
                        parameters, context, executemany):
            canary.append('cursor_execute')
            return statement, parameters

        engine = engines.testing_engine()

        assert_raises(
            tsa.exc.ArgumentError,
            event.listen, engine, "begin", tracker("begin"), retval=True
        )

        event.listen(engine, "before_execute", execute, retval=True)
        event.listen(engine, "before_cursor_execute", cursor_execute, retval=True)
        engine.execute(select([1]))
        eq_(
            canary, ['execute', 'cursor_execute']
        )

    def test_transactional(self):
        canary = []
        def tracker(name):
            def go(conn, *args, **kw):
                canary.append(name)
            return go

        engine = engines.testing_engine()
        event.listen(engine, 'before_execute', tracker('execute'))
        event.listen(engine, 'before_cursor_execute', tracker('cursor_execute'))
        event.listen(engine, 'begin', tracker('begin'))
        event.listen(engine, 'commit', tracker('commit'))
        event.listen(engine, 'rollback', tracker('rollback'))

        conn = engine.connect()
        trans = conn.begin()
        conn.execute(select([1]))
        trans.rollback()
        trans = conn.begin()
        conn.execute(select([1]))
        trans.commit()

        eq_(canary, [
            'begin', 'execute', 'cursor_execute', 'rollback',
            'begin', 'execute', 'cursor_execute', 'commit',
            ])

    def test_explode_in_initializer(self):
        engine = engines.testing_engine()

        def broken_initialize(connection):
            connection.execute("select fake_stuff from _fake_table")

        engine.dialect.initialize = broken_initialize

        # raises a DBAPIError, not an AttributeError
        assert_raises(exc.DBAPIError, engine.connect)

        # dispose connections so we get a new one on
        # next go
        engine.dispose()

        p1 = engine.pool

        def is_disconnect(e, conn, cursor):
            return True

        engine.dialect.is_disconnect = is_disconnect

        # invalidate() also doesn't screw up
        assert_raises(exc.DBAPIError, engine.connect)

        # pool was recreated
        assert engine.pool is not p1

    def test_twophase(self):
        users, Address, addresses, User = (self.tables.users,
                                self.classes.Address,
                                self.tables.addresses,
                                self.classes.User)

        # TODO: mock up a failure condition here
        # to ensure a rollback succeeds
        mapper(User, users)
        mapper(Address, addresses)

        engine2 = engines.testing_engine()
        sess = create_session(autocommit=True, autoflush=False,
                            twophase=True)
        sess.bind_mapper(User, testing.db)
        sess.bind_mapper(Address, engine2)
        sess.begin()
        u1 = User(name='u1')
        a1 = Address(email_address='[email protected]')
        sess.add_all((u1, a1))
        sess.commit()
        sess.close()
        engine2.dispose()
        assert users.count().scalar() == 1
        assert addresses.count().scalar() == 1

    def test_levels(self):
        e1 = engines.testing_engine()

        eq_(e1._should_log_info(), False)
        eq_(e1._should_log_debug(), False)
        eq_(e1.logger.isEnabledFor(logging.INFO), False)
        eq_(e1.logger.getEffectiveLevel(), logging.WARN)

        e1.echo = True
        eq_(e1._should_log_info(), True)
        eq_(e1._should_log_debug(), False)
        eq_(e1.logger.isEnabledFor(logging.INFO), True)
        eq_(e1.logger.getEffectiveLevel(), logging.INFO)

        e1.echo = 'debug'
        eq_(e1._should_log_info(), True)
        eq_(e1._should_log_debug(), True)
        eq_(e1.logger.isEnabledFor(logging.DEBUG), True)
        eq_(e1.logger.getEffectiveLevel(), logging.DEBUG)

        e1.echo = False
        eq_(e1._should_log_info(), False)
        eq_(e1._should_log_debug(), False)
        eq_(e1.logger.isEnabledFor(logging.INFO), False)
        eq_(e1.logger.getEffectiveLevel(), logging.WARN)

    def test_transactional_advanced(self):
        canary = []
        def tracker(name):
            def go(*args, **kw):
                canary.append(name)
            return go

        engine = engines.testing_engine()
        for name in ['begin', 'savepoint', 
                    'rollback_savepoint', 'release_savepoint',
                    'rollback', 'begin_twophase', 
                       'prepare_twophase', 'commit_twophase']:
            event.listen(engine, '%s' % name, tracker(name))

        conn = engine.connect()

        trans = conn.begin()
        trans2 = conn.begin_nested()
        conn.execute(select([1]))
        trans2.rollback()
        trans2 = conn.begin_nested()
        conn.execute(select([1]))
        trans2.commit()
        trans.rollback()

        trans = conn.begin_twophase()
        conn.execute(select([1]))
        trans.prepare()
        trans.commit()

        eq_(canary, ['begin', 'savepoint', 
                    'rollback_savepoint', 'savepoint', 'release_savepoint',
                    'rollback', 'begin_twophase', 
                       'prepare_twophase', 'commit_twophase']
        )

    def test_ad_hoc_types(self):
        """test storage of bind processors, result processors
        in dialect-wide registry."""

        from sqlalchemy.dialects import mysql, postgresql, sqlite
        from sqlalchemy import types

        eng = engines.testing_engine()
        for args in (
            (types.Integer, ),
            (types.String, ),
            (types.PickleType, ),
            (types.Enum, 'a', 'b', 'c'),
            (sqlite.DATETIME, ),
            (postgresql.ENUM, 'a', 'b', 'c'),
            (types.Interval, ),
            (postgresql.INTERVAL, ),
            (mysql.VARCHAR, ),
        ):
            @profile_memory
            def go():
                type_ = args[0](*args[1:])
                bp = type_._cached_bind_processor(eng.dialect)
                rp = type_._cached_result_processor(eng.dialect, 0)
            go()

        assert not eng.dialect._type_memos

 def _named_engine(self, **kw):
     options = {
         'logging_name':'myenginename',
         'pool_logging_name':'mypoolname'
     }
     options.update(kw)
     return engines.testing_engine(options=options)

    def setUp(self):
        global db1, db2, db3, db4, weather_locations, weather_reports

        try:
            db1 = testing_engine('sqlite:///shard1.db', options=dict(pool_threadlocal=True))
        except ImportError:
            raise SkipTest('Requires sqlite')
        db2 = testing_engine('sqlite:///shard2.db')
        db3 = testing_engine('sqlite:///shard3.db')
        db4 = testing_engine('sqlite:///shard4.db')

        meta = MetaData()
        ids = Table('ids', meta,
            Column('nextid', Integer, nullable=False))

        def id_generator(ctx):
            # in reality, might want to use a separate transaction for this.

            c = db1.contextual_connect()
            nextid = c.execute(ids.select(for_update=True)).scalar()
            c.execute(ids.update(values={ids.c.nextid : ids.c.nextid + 1}))
            return nextid

        weather_locations = Table("weather_locations", meta,
                Column('id', Integer, primary_key=True, default=id_generator),
                Column('continent', String(30), nullable=False),
                Column('city', String(50), nullable=False)
            )

        weather_reports = Table(
            'weather_reports',
            meta,
            Column('id', Integer, primary_key=True),
            Column('location_id', Integer,
                   ForeignKey('weather_locations.id')),
            Column('temperature', Float),
            Column('report_time', DateTime,
                   default=datetime.datetime.now),
            )

        for db in (db1, db2, db3, db4):
            meta.create_all(db)

        db1.execute(ids.insert(), nextid=1)

        self.setup_session()
        self.setup_mappers()

 def test_invalid_level(self):
     eng = testing_engine(options=dict(isolation_level='FOO'))
     assert_raises_message(
         exc.ArgumentError, 
             "Invalid value '%s' for isolation_level. "
             "Valid isolation levels for %s are %s" % 
             ("FOO", eng.dialect.name, ", ".join(eng.dialect._isolation_lookup)),
         eng.connect)