Python sa.MetaData类代码示例

 def test_nonreflected_fk_raises(self):
     """test that a NoReferencedColumnError is raised when reflecting
     a table with an FK to another table which has not included the target
     column in its reflection.
     
     """
     meta = MetaData(testing.db)
     a1 = Table('a', meta,
         Column('x', sa.Integer, primary_key=True),
         Column('z', sa.Integer),
         test_needs_fk=True
     )
     b1 = Table('b', meta,
         Column('y', sa.Integer, sa.ForeignKey('a.x')),
         test_needs_fk=True
     )
     meta.create_all()
     try:
         m2 = MetaData(testing.db)
         a2 = Table('a', m2, include_columns=['z'], autoload=True)
         b2 = Table('b', m2, autoload=True)
         
         self.assertRaises(tsa.exc.NoReferencedColumnError, a2.join, b2)
     finally:
         meta.drop_all()

    def test_override_keys(self):
        """test that columns can be overridden with a 'key', 
        and that ForeignKey targeting during reflection still works."""
        

        meta = MetaData(testing.db)
        a1 = Table('a', meta,
            Column('x', sa.Integer, primary_key=True),
            Column('z', sa.Integer),
            test_needs_fk=True
        )
        b1 = Table('b', meta,
            Column('y', sa.Integer, sa.ForeignKey('a.x')),
            test_needs_fk=True
        )
        meta.create_all()
        try:
            m2 = MetaData(testing.db)
            a2 = Table('a', m2, Column('x', sa.Integer, primary_key=True, key='x1'), autoload=True)
            b2 = Table('b', m2, autoload=True)
            
            assert a2.join(b2).onclause.compare(a2.c.x1==b2.c.y)
            assert b2.c.y.references(a2.c.x1)
        finally:
            meta.drop_all()

    def test_use_existing(self):
        meta = MetaData(testing.db)
        users = Table('users', meta,
            Column('id', sa.Integer, primary_key=True),
            Column('name', sa.String(30)),
            test_needs_fk=True)
        addresses = Table('addresses', meta,
            Column('id', sa.Integer,primary_key=True),
            Column('user_id', sa.Integer, sa.ForeignKey('users.id')),
            Column('data', sa.String(100)),
            test_needs_fk=True)

        meta.create_all()
        try:
            meta2 = MetaData(testing.db)
            addresses = Table('addresses', meta2, Column('data', sa.Unicode), autoload=True)
            try:
                users = Table('users', meta2, Column('name', sa.Unicode), autoload=True)
                assert False
            except tsa.exc.InvalidRequestError, err:
                assert str(err) == "Table 'users' is already defined for this MetaData instance.  Specify 'useexisting=True' to redefine options and columns on an existing Table object."

            users = Table('users', meta2, Column('name', sa.Unicode), autoload=True, useexisting=True)
            assert isinstance(users.c.name.type, sa.Unicode)

            assert not users.quote

            users = Table('users', meta2, quote=True, autoload=True, useexisting=True)
            assert users.quote

    def test_composite_fk(self):
        """test reflection of composite foreign keys"""

        meta = MetaData(testing.db)
        multi = Table(
            'multi', meta,
            Column('multi_id', sa.Integer, primary_key=True),
            Column('multi_rev', sa.Integer, primary_key=True),
            Column('multi_hoho', sa.Integer, primary_key=True),
            Column('name', sa.String(50), nullable=False),
            Column('val', sa.String(100)),
            test_needs_fk=True,
        )
        multi2 = Table('multi2', meta,
            Column('id', sa.Integer, primary_key=True),
            Column('foo', sa.Integer),
            Column('bar', sa.Integer),
            Column('lala', sa.Integer),
            Column('data', sa.String(50)),
            sa.ForeignKeyConstraint(['foo', 'bar', 'lala'], ['multi.multi_id', 'multi.multi_rev', 'multi.multi_hoho']),
            test_needs_fk=True,
        )
        meta.create_all()

        try:
            meta2 = MetaData()
            table = Table('multi', meta2, autoload=True, autoload_with=testing.db)
            table2 = Table('multi2', meta2, autoload=True, autoload_with=testing.db)
            self.assert_tables_equal(multi, table)
            self.assert_tables_equal(multi2, table2)
            j = sa.join(table, table2)
            self.assert_(sa.and_(table.c.multi_id==table2.c.foo, table.c.multi_rev==table2.c.bar, table.c.multi_hoho==table2.c.lala).compare(j.onclause))
        finally:
            meta.drop_all()

    def test_include_columns(self):
        meta = MetaData(testing.db)
        foo = Table('foo', meta, *[Column(n, sa.String(30))
                                   for n in ['a', 'b', 'c', 'd', 'e', 'f']])
        meta.create_all()
        try:
            meta2 = MetaData(testing.db)
            foo = Table('foo', meta2, autoload=True,
                        include_columns=['b', 'f', 'e'])
            # test that cols come back in original order
            self.assertEquals([c.name for c in foo.c], ['b', 'e', 'f'])
            for c in ('b', 'f', 'e'):
                assert c in foo.c
            for c in ('a', 'c', 'd'):
                assert c not in foo.c

            # test against a table which is already reflected
            meta3 = MetaData(testing.db)
            foo = Table('foo', meta3, autoload=True)
            foo = Table('foo', meta3, include_columns=['b', 'f', 'e'],
                        useexisting=True)
            self.assertEquals([c.name for c in foo.c], ['b', 'e', 'f'])
            for c in ('b', 'f', 'e'):
                assert c in foo.c
            for c in ('a', 'c', 'd'):
                assert c not in foo.c
        finally:
            meta.drop_all()

 def _test_get_table_names(self, schema=None, table_type='table',
                           order_by=None):
     meta = MetaData(testing.db)
     (users, addresses) = createTables(meta, schema)
     meta.create_all()
     createViews(meta.bind, schema)
     try:
         insp = Inspector(meta.bind)
         if table_type == 'view':
             table_names = insp.get_view_names(schema)
             table_names.sort()
             answer = ['email_addresses_v', 'users_v']
         else:
             table_names = insp.get_table_names(schema,
                                                order_by=order_by)
             table_names.sort()
             if order_by == 'foreign_key':
                 answer = ['users', 'email_addresses']
             else:
                 answer = ['email_addresses', 'users']
         self.assertEqual(table_names, answer)
     finally:
         dropViews(meta.bind, schema)
         addresses.drop()
         users.drop()

 def _test_get_foreign_keys(self, schema=None):
     meta = MetaData(testing.db)
     (users, addresses) = createTables(meta, schema)
     meta.create_all()
     insp = Inspector(meta.bind)
     try:
         expected_schema = schema
         if schema is None:
             try:
                 expected_schema = meta.bind.dialect.get_default_schema_name(
                                 meta.bind)
             except NotImplementedError:
                 expected_schema = None
         # users
         users_fkeys = insp.get_foreign_keys(users.name,
                                             schema=schema)
         fkey1 = users_fkeys[0]
         self.assert_(fkey1['name'] is not None)
         self.assertEqual(fkey1['referred_schema'], expected_schema)
         self.assertEqual(fkey1['referred_table'], users.name)
         self.assertEqual(fkey1['referred_columns'], ['user_id', ])
         self.assertEqual(fkey1['constrained_columns'], ['parent_user_id'])
         #addresses
         addr_fkeys = insp.get_foreign_keys(addresses.name,
                                            schema=schema)
         fkey1 = addr_fkeys[0]
         self.assert_(fkey1['name'] is not None)
         self.assertEqual(fkey1['referred_schema'], expected_schema)
         self.assertEqual(fkey1['referred_table'], users.name)
         self.assertEqual(fkey1['referred_columns'], ['user_id', ])
         self.assertEqual(fkey1['constrained_columns'], ['remote_user_id'])
     finally:
         addresses.drop()
         users.drop()

    def _test_get_indexes(self, schema=None):
        meta = MetaData(testing.db)
        (users, addresses) = createTables(meta, schema)
        meta.create_all()
        createIndexes(meta.bind, schema)
        try:
            # The database may decide to create indexes for foreign keys, etc.
            # so there may be more indexes than expected.
            insp = Inspector(meta.bind)
            indexes = insp.get_indexes('users', schema=schema)
            indexes.sort()
            if testing.against('oracle'):
                expected_indexes = [
                    {'unique': False,
                     'column_names': ['TEST1', 'TEST2'],
                     'name': 'USERS_T_IDX'}]
            else:
                expected_indexes = [
                    {'unique': False,
                     'column_names': ['test1', 'test2'],
                     'name': 'users_t_idx'}]
            index_names = [d['name'] for d in indexes]
            for e_index in expected_indexes:
                self.assertTrue(e_index['name'] in index_names)
                index = indexes[index_names.index(e_index['name'])]
                for key in e_index:
                    self.assertEqual(e_index[key], index[key])

        finally:
            addresses.drop()
            users.drop()

    def test_index_reflection(self):
        m1 = MetaData(testing.db)
        t1 = Table('party', m1,
            Column('id', sa.Integer, nullable=False),
            Column('name', sa.String(20), index=True)
            )
        i1 = sa.Index('idx1', t1.c.id, unique=True)
        i2 = sa.Index('idx2', t1.c.name, t1.c.id, unique=False)
        m1.create_all()
        try:
            m2 = MetaData(testing.db)
            t2 = Table('party', m2, autoload=True)

            print len(t2.indexes), t2.indexes
            assert len(t2.indexes) == 3
            # Make sure indexes are in the order we expect them in
            tmp = [(idx.name, idx) for idx in t2.indexes]
            tmp.sort()
            r1, r2, r3 = [idx[1] for idx in tmp]

            assert r1.name == 'idx1'
            assert r2.name == 'idx2'
            assert r1.unique == True
            assert r2.unique == False
            assert r3.unique == False
            assert [t2.c.id] == r1.columns
            assert [t2.c.name, t2.c.id] == r2.columns
            assert [t2.c.name] == r3.columns
        finally:
            m1.drop_all()

    def test_basic(self):
        try:
            # the 'convert_unicode' should not get in the way of the reflection
            # process.  reflecttable for oracle, postgres (others?) expect non-unicode
            # strings in result sets/bind params
            bind = engines.utf8_engine(options={'convert_unicode':True})
            metadata = MetaData(bind)

            if testing.against('sybase', 'maxdb', 'oracle', 'mssql'):
                names = set(['plain'])
            else:
                names = set([u'plain', u'Unit\u00e9ble', u'\u6e2c\u8a66'])

            for name in names:
                Table(name, metadata, Column('id', sa.Integer, sa.Sequence(name + "_id_seq"), primary_key=True))
            metadata.create_all()

            reflected = set(bind.table_names())
            if not names.issubset(reflected):
                # Python source files in the utf-8 coding seem to normalize
                # literals as NFC (and the above are explicitly NFC).  Maybe
                # this database normalizes NFD on reflection.
                nfc = set([unicodedata.normalize('NFC', n) for n in names])
                self.assert_(nfc == names)
                # Yep.  But still ensure that bulk reflection and create/drop
                # work with either normalization.

            r = MetaData(bind, reflect=True)
            r.drop_all()
            r.create_all()
        finally:
            metadata.drop_all()
            bind.dispose()

    def test_with_inheritance(self):
        metadata = MetaData(testing.db)

        table1 = Table("mytable", metadata,
            Column('col1', Integer, primary_key=True),
            Column('col2', String(30))
            )

        table2 = Table("mytable2", metadata,
            Column('col1', Integer, ForeignKey('mytable.col1'),
                   primary_key=True),
            Column('col3', String(30)),
            )

        @profile_memory
        def go():
            class A(_base.ComparableEntity):
                pass
            class B(A):
                pass

            mapper(A, table1,
                   polymorphic_on=table1.c.col2,
                   polymorphic_identity='a')
            mapper(B, table2,
                   inherits=A,
                   polymorphic_identity='b')

            sess = create_session()
            a1 = A()
            a2 = A()
            b1 = B(col3='b1')
            b2 = B(col3='b2')
            for x in [a1,a2,b1, b2]:
                sess.add(x)
            sess.flush()
            sess.clear()

            alist = sess.query(A).order_by(A.col1).all()
            self.assertEquals(
                [
                    A(), A(), B(col3='b1'), B(col3='b2')
                ],
                alist)

            for a in alist:
                sess.delete(a)
            sess.flush()

            # dont need to clear_mappers()
            del B
            del A

        metadata.create_all()
        try:
            go()
        finally:
            metadata.drop_all()
        assert_no_mappers()

 def setUpAll(self):
     global users, metadata
     metadata = MetaData(testing.db)
     users = Table('users', metadata,
         Column('user_id', INT, primary_key = True),
         Column('user_name', VARCHAR(20)),
     )
     metadata.create_all()

    def test_override_nonexistent_fk(self):
        """test that you can override columns and create new foreign keys to other reflected tables
        which have no foreign keys.  this is common with MySQL MyISAM tables."""

        meta = MetaData(testing.db)
        users = Table('users', meta,
            Column('id', sa.Integer, primary_key=True),
            Column('name', sa.String(30)))
        addresses = Table('addresses', meta,
            Column('id', sa.Integer, primary_key=True),
            Column('street', sa.String(30)),
            Column('user_id', sa.Integer))

        meta.create_all()
        try:
            meta2 = MetaData(testing.db)
            a2 = Table('addresses', meta2,
                Column('user_id', sa.Integer, sa.ForeignKey('users.id')),
                autoload=True)
            u2 = Table('users', meta2, autoload=True)

            assert len(a2.c.user_id.foreign_keys) == 1
            assert len(a2.foreign_keys) == 1
            assert [c.parent for c in a2.foreign_keys] == [a2.c.user_id]
            assert [c.parent for c in a2.c.user_id.foreign_keys] == [a2.c.user_id]
            assert list(a2.c.user_id.foreign_keys)[0].parent is a2.c.user_id
            assert u2.join(a2).onclause == u2.c.id==a2.c.user_id

            meta3 = MetaData(testing.db)
            u3 = Table('users', meta3, autoload=True)
            a3 = Table('addresses', meta3,
                Column('user_id', sa.Integer, sa.ForeignKey('users.id')),
                autoload=True)

            assert u3.join(a3).onclause == u3.c.id==a3.c.user_id

            meta4 = MetaData(testing.db)
            u4 = Table('users', meta4,
                       Column('id', sa.Integer, key='u_id', primary_key=True),
                       autoload=True)
            a4 = Table('addresses', meta4,
                       Column('id', sa.Integer, key='street', primary_key=True),
                       Column('street', sa.String(30), key='user_id'),
                       Column('user_id', sa.Integer, sa.ForeignKey('users.u_id'),
                              key='id'),
                       autoload=True)

            assert u4.join(a4).onclause.compare(u4.c.u_id==a4.c.id)
            assert list(u4.primary_key) == [u4.c.u_id]
            assert len(u4.columns) == 2
            assert len(u4.constraints) == 1
            assert len(a4.columns) == 3
            assert len(a4.constraints) == 2
        finally:
            meta.drop_all()

 def setUp(self):
     global meta, table, engine
     engine = engines.reconnecting_engine()
     meta = MetaData(engine)
     table = Table('sometable', meta,
         Column('id', Integer, primary_key=True),
         Column('name', String(50)))
     meta.create_all()
     table.insert().execute(
         [{'id':i, 'name':'row %d' % i} for i in range(1, 100)]
     )

    def test_mapper_reset(self):
        metadata = MetaData(testing.db)

        table1 = Table("mytable", metadata,
            Column('col1', Integer, primary_key=True),
            Column('col2', String(30)))

        table2 = Table("mytable2", metadata,
            Column('col1', Integer, primary_key=True),
            Column('col2', String(30)),
            Column('col3', Integer, ForeignKey("mytable.col1")))

        @profile_memory
        def go():
            m1 = mapper(A, table1, properties={
                "bs":relation(B, order_by=table2.c.col1)
            })
            m2 = mapper(B, table2)

            m3 = mapper(A, table1, non_primary=True)

            sess = create_session()
            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.clear()

            alist = sess.query(A).order_by(A.col1).all()
            self.assertEquals(
                [
                    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()
            clear_mappers()

        metadata.create_all()
        try:
            go()
        finally:
            metadata.drop_all()
        assert_no_mappers()