Python MetaData.drop_all方法代码示例

# 需要导入模块: from testlib.sa import MetaData [as 别名]
# 或者: from testlib.sa.MetaData import drop_all [as 别名]
 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()

# 需要导入模块: from testlib.sa import MetaData [as 别名]
# 或者: from testlib.sa.MetaData import drop_all [as 别名]
    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()

# 需要导入模块: from testlib.sa import MetaData [as 别名]
# 或者: from testlib.sa.MetaData import drop_all [as 别名]
    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()

# 需要导入模块: from testlib.sa import MetaData [as 别名]
# 或者: from testlib.sa.MetaData import drop_all [as 别名]
    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()

# 需要导入模块: from testlib.sa import MetaData [as 别名]
# 或者: from testlib.sa.MetaData import drop_all [as 别名]
    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()

# 需要导入模块: from testlib.sa import MetaData [as 别名]
# 或者: from testlib.sa.MetaData import drop_all [as 别名]
    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()

# 需要导入模块: from testlib.sa import MetaData [as 别名]
# 或者: from testlib.sa.MetaData import drop_all [as 别名]
    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()

# 需要导入模块: from testlib.sa import MetaData [as 别名]
# 或者: from testlib.sa.MetaData import drop_all [as 别名]
    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()

# 需要导入模块: from testlib.sa import MetaData [as 别名]
# 或者: from testlib.sa.MetaData import drop_all [as 别名]
    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()

# 需要导入模块: from testlib.sa import MetaData [as 别名]
# 或者: from testlib.sa.MetaData import drop_all [as 别名]
 def test_empty_insert(self):
     metadata = MetaData(testing.db)
     t1 = Table('t1', metadata,
             Column('is_true', Boolean, server_default=('1')))
     metadata.create_all()
     
     try:
         result = t1.insert().execute()
         self.assertEquals(1, select([func.count(text('*'))], from_obj=t1).scalar())
         self.assertEquals(True, t1.select().scalar())
     finally:
         metadata.drop_all()

# 需要导入模块: from testlib.sa import MetaData [as 别名]
# 或者: from testlib.sa.MetaData import drop_all [as 别名]
    def test_override_existing_fk(self):
        """test that you can override columns and specify new foreign keys to other reflected tables,
        on columns which *do* already have that foreign key, and that the FK is not duped.
        """

        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')),
            test_needs_fk=True)

        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)

            s = sa.select([a2])
            assert s.c.user_id
            assert len(a2.foreign_keys) == 1
            assert len(a2.c.user_id.foreign_keys) == 1
            assert len(a2.constraints) == 2
            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

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

            s = sa.select([a2])
            assert s.c.user_id
            assert len(a2.foreign_keys) == 1
            assert len(a2.c.user_id.foreign_keys) == 1
            assert len(a2.constraints) == 2
            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
        finally:
            meta.drop_all()

# 需要导入模块: from testlib.sa import MetaData [as 别名]
# 或者: from testlib.sa.MetaData import drop_all [as 别名]
    def test_mutable_identity(self):
        metadata = MetaData(testing.db)

        table1 = Table("mytable", metadata,
            Column('col1', Integer, primary_key=True),
            Column('col2', PickleType(comparator=operator.eq))
            )
        
        class Foo(object):
            def __init__(self, col2):
                self.col2 = col2
        
        mapper(Foo, table1)
        metadata.create_all()
        
        session = sessionmaker()()
        
        def go():
            obj = [
                Foo({'a':1}),
                Foo({'b':1}),
                Foo({'c':1}),
                Foo({'d':1}),
                Foo({'e':1}),
                Foo({'f':1}),
                Foo({'g':1}),
                Foo({'h':1}),
                Foo({'i':1}),
                Foo({'j':1}),
                Foo({'k':1}),
                Foo({'l':1}),
            ]
            
            session.add_all(obj)
            session.commit()
            
            testing.eq_(len(session.identity_map._mutable_attrs), 12)
            testing.eq_(len(session.identity_map), 12)
            obj = None
            gc.collect()
            testing.eq_(len(session.identity_map._mutable_attrs), 0)
            testing.eq_(len(session.identity_map), 0)
            
        try:
            go()
        finally:
            metadata.drop_all()

# 需要导入模块: from testlib.sa import MetaData [as 别名]
# 或者: from testlib.sa.MetaData import drop_all [as 别名]
    def test_with_explicit_autoloaded(self):
        meta = MetaData(testing.db)
        t1 = Table('t1', meta,
                   Column('id', String(50), primary_key=True),
                   Column('data', String(50)))
        meta.create_all()
        try:
            class MyObj(Base):
                __table__ = Table('t1', Base.metadata, autoload=True)

            sess = create_session()
            m = MyObj(id="someid", data="somedata")
            sess.add(m)
            sess.flush()

            eq_(t1.select().execute().fetchall(), [('someid', 'somedata')])
        finally:
            meta.drop_all()

# 需要导入模块: from testlib.sa import MetaData [as 别名]
# 或者: from testlib.sa.MetaData import drop_all [as 别名]
    def test_reserved(self):
        # check a table that uses an SQL reserved name doesn't cause an error
        meta = MetaData(testing.db)
        table_a = Table('select', meta,
                       Column('not', sa.Integer, primary_key=True),
                       Column('from', sa.String(12), nullable=False),
                       sa.UniqueConstraint('from', name='when'))
        sa.Index('where', table_a.c['from'])

        # There's currently no way to calculate identifier case normalization
        # in isolation, so...
        if testing.against('firebird', 'oracle', 'maxdb'):
            check_col = 'TRUE'
        else:
            check_col = 'true'
        quoter = meta.bind.dialect.identifier_preparer.quote_identifier

        table_b = Table('false', meta,
                        Column('create', sa.Integer, primary_key=True),
                        Column('true', sa.Integer, sa.ForeignKey('select.not')),
                        sa.CheckConstraint('%s <> 1' % quoter(check_col),
                                        name='limit'))

        table_c = Table('is', meta,
                        Column('or', sa.Integer, nullable=False, primary_key=True),
                        Column('join', sa.Integer, nullable=False, primary_key=True),
                        sa.PrimaryKeyConstraint('or', 'join', name='to'))

        index_c = sa.Index('else', table_c.c.join)

        meta.create_all()

        index_c.drop()

        meta2 = MetaData(testing.db)
        try:
            table_a2 = Table('select', meta2, autoload=True)
            table_b2 = Table('false', meta2, autoload=True)
            table_c2 = Table('is', meta2, autoload=True)
        finally:
            meta.drop_all()

# 需要导入模块: from testlib.sa import MetaData [as 别名]
# 或者: from testlib.sa.MetaData import drop_all [as 别名]
    def test_basic_reflection(self):
        meta = MetaData(testing.db)

        users = Table('engine_users', meta,
            Column('user_id', sa.INT, primary_key=True),
            Column('user_name', sa.VARCHAR(20), nullable=False),
            Column('test1', sa.CHAR(5), nullable=False),
            Column('test2', sa.Float(5), nullable=False),
            Column('test3', sa.Text),
            Column('test4', sa.Numeric, nullable = False),
            Column('test5', sa.Date),
            Column('parent_user_id', sa.Integer,
                   sa.ForeignKey('engine_users.user_id')),
            Column('test6', sa.Date, nullable=False),
            Column('test7', sa.Text),
            Column('test8', sa.Binary),
            Column('test_passivedefault2', sa.Integer, server_default='5'),
            Column('test9', sa.Binary(100)),
            Column('test_numeric', sa.Numeric()),
            test_needs_fk=True,
        )

        addresses = Table('engine_email_addresses', meta,
            Column('address_id', sa.Integer, primary_key = True),
            Column('remote_user_id', sa.Integer, sa.ForeignKey(users.c.user_id)),
            Column('email_address', sa.String(20)),
            test_needs_fk=True,
        )
        meta.create_all()

        try:
            meta2 = MetaData()
            reflected_users = Table('engine_users', meta2, autoload=True,
                                    autoload_with=testing.db)
            reflected_addresses = Table('engine_email_addresses', meta2,
                                        autoload=True, autoload_with=testing.db)
            self.assert_tables_equal(users, reflected_users)
            self.assert_tables_equal(addresses, reflected_addresses)
        finally:
            meta.drop_all()