sqlalchemy/test/sql/test_defaults.py

from test.lib.testing import eq_, assert_raises, assert_raises_message
import datetime
from sqlalchemy.schema import CreateSequence, DropSequence
from sqlalchemy.sql import select, text, literal_column
import sqlalchemy as sa
from test.lib import testing, engines
from sqlalchemy import MetaData, Integer, String, ForeignKey, Boolean, exc,\
                Sequence, func, literal
from sqlalchemy.types import TypeDecorator
from test.lib.schema import Table, Column
from test.lib.testing import eq_
from test.sql import _base


class DefaultTest(testing.TestBase):

    @classmethod
    def setup_class(cls):
        global t, f, f2, ts, currenttime, metadata, default_generator

        db = testing.db
        metadata = MetaData(db)
        default_generator = {'x':50}

        def mydefault():
            default_generator['x'] += 1
            return default_generator['x']

        def myupdate_with_ctx(ctx):
            conn = ctx.connection
            return conn.execute(sa.select([sa.text('13')])).scalar()

        def mydefault_using_connection(ctx):
            conn = ctx.connection
            try:
                return conn.execute(sa.select([sa.text('12')])).scalar()
            finally:
                # ensure a "close()" on this connection does nothing,
                # since its a "branched" connection
                conn.close()

        use_function_defaults = testing.against('postgresql', 'mssql', 'maxdb')
        is_oracle = testing.against('oracle')

        # select "count(1)" returns different results on different DBs also
        # correct for "current_date" compatible as column default, value
        # differences
        currenttime = func.current_date(type_=sa.Date, bind=db)
        if is_oracle:
            ts = db.scalar(sa.select([func.trunc(func.sysdate(), sa.literal_column("'DAY'"), type_=sa.Date).label('today')]))
            assert isinstance(ts, datetime.date) and not isinstance(ts, datetime.datetime)
            f = sa.select([func.length('abcdef')], bind=db).scalar()
            f2 = sa.select([func.length('abcdefghijk')], bind=db).scalar()
            # TODO: engine propigation across nested functions not working
            currenttime = func.trunc(currenttime, sa.literal_column("'DAY'"), bind=db, type_=sa.Date)
            def1 = currenttime
            def2 = func.trunc(sa.text("sysdate"), sa.literal_column("'DAY'"), type_=sa.Date)

            deftype = sa.Date
        elif use_function_defaults:
            f = sa.select([func.length('abcdef')], bind=db).scalar()
            f2 = sa.select([func.length('abcdefghijk')], bind=db).scalar()
            def1 = currenttime
            deftype = sa.Date
            if testing.against('maxdb'):
                def2 = sa.text("curdate")
            elif testing.against('mssql'):
                def2 = sa.text("getdate()")
            else:
                def2 = sa.text("current_date")
            ts = db.func.current_date().scalar()
        else:
            f = len('abcdef')
            f2 = len('abcdefghijk')
            def1 = def2 = "3"
            ts = 3
            deftype = Integer

        t = Table('default_test1', metadata,
            # python function
            Column('col1', Integer, primary_key=True,
                   default=mydefault),

            # python literal
            Column('col2', String(20),
                   default="imthedefault",
                   onupdate="im the update"),

            # preexecute expression
            Column('col3', Integer,
                   default=func.length('abcdef'),
                   onupdate=func.length('abcdefghijk')),

            # SQL-side default from sql expression
            Column('col4', deftype,
                   server_default=def1),

            # SQL-side default from literal expression
            Column('col5', deftype,
                   server_default=def2),

            # preexecute + update timestamp
            Column('col6', sa.Date,
                   default=currenttime,
                   onupdate=currenttime),

            Column('boolcol1', sa.Boolean, default=True),
            Column('boolcol2', sa.Boolean, default=False),

            # python function which uses ExecutionContext
            Column('col7', Integer,
                   default=mydefault_using_connection,
                   onupdate=myupdate_with_ctx),

            # python builtin
            Column('col8', sa.Date,
                   default=datetime.date.today,
                   onupdate=datetime.date.today),
            # combo
            Column('col9', String(20),
                   default='py',
                   server_default='ddl'))
        t.create()

    @classmethod
    def teardown_class(cls):
        t.drop()

    def teardown(self):
        default_generator['x'] = 50
        t.delete().execute()

    def test_bad_arg_signature(self):
        ex_msg = \
          "ColumnDefault Python function takes zero or one positional arguments"

        def fn1(x, y): pass
        def fn2(x, y, z=3): pass
        class fn3(object):
            def __init__(self, x, y):
                pass
        class FN4(object):
            def __call__(self, x, y):
                pass
        fn4 = FN4()

        for fn in fn1, fn2, fn3, fn4:
            assert_raises_message(sa.exc.ArgumentError,
                                     ex_msg,
                                     sa.ColumnDefault, fn)

    def test_arg_signature(self):
        def fn1(): pass
        def fn2(): pass
        def fn3(x=1): pass
        def fn4(x=1, y=2, z=3): pass
        fn5 = list
        class fn6(object):
            def __init__(self, x):
                pass
        class fn6(object):
            def __init__(self, x, y=3):
                pass
        class FN7(object):
            def __call__(self, x):
                pass
        fn7 = FN7()
        class FN8(object):
            def __call__(self, x, y=3):
                pass
        fn8 = FN8()

        for fn in fn1, fn2, fn3, fn4, fn5, fn6, fn7, fn8:
            c = sa.ColumnDefault(fn)

    @testing.fails_on('firebird', 'Data type unknown')
    def test_standalone(self):
        c = testing.db.engine.contextual_connect()
        x = c.execute(t.c.col1.default)
        y = t.c.col2.default.execute()
        z = c.execute(t.c.col3.default)
        assert 50 <= x <= 57
        eq_(y, 'imthedefault')
        eq_(z, f)
        eq_(f2, 11)

    def test_py_vs_server_default_detection(self):

        def has_(name, *wanted):
            slots = ['default', 'onupdate', 'server_default', 'server_onupdate']
            col = tbl.c[name]
            for slot in wanted:
                slots.remove(slot)
                assert getattr(col, slot) is not None, getattr(col, slot)
            for slot in slots:
                assert getattr(col, slot) is None, getattr(col, slot)

        tbl = t
        has_('col1', 'default')
        has_('col2', 'default', 'onupdate')
        has_('col3', 'default', 'onupdate')
        has_('col4', 'server_default')
        has_('col5', 'server_default')
        has_('col6', 'default', 'onupdate')
        has_('boolcol1', 'default')
        has_('boolcol2', 'default')
        has_('col7', 'default', 'onupdate')
        has_('col8', 'default', 'onupdate')
        has_('col9', 'default', 'server_default')

        ColumnDefault, DefaultClause = sa.ColumnDefault, sa.DefaultClause

        t2 = Table('t2', MetaData(),
                   Column('col1', Integer, Sequence('foo')),
                   Column('col2', Integer,
                          default=Sequence('foo'),
                          server_default='y'),
                   Column('col3', Integer,
                          Sequence('foo'),
                          server_default='x'),
                   Column('col4', Integer,
                          ColumnDefault('x'),
                          DefaultClause('y')),
                   Column('col4', Integer,
                          ColumnDefault('x'),
                          DefaultClause('y'),
                          DefaultClause('y', for_update=True)),
                   Column('col5', Integer,
                          ColumnDefault('x'),
                          DefaultClause('y'),
                          onupdate='z'),
                   Column('col6', Integer,
                          ColumnDefault('x'),
                          server_default='y',
                          onupdate='z'),
                   Column('col7', Integer,
                          default='x',
                          server_default='y',
                          onupdate='z'),
                   Column('col8', Integer,
                          server_onupdate='u',
                          default='x',
                          server_default='y',
                          onupdate='z'))
        tbl = t2
        has_('col1', 'default')
        has_('col2', 'default', 'server_default')
        has_('col3', 'default', 'server_default')
        has_('col4', 'default', 'server_default', 'server_onupdate')
        has_('col5', 'default', 'server_default', 'onupdate')
        has_('col6', 'default', 'server_default', 'onupdate')
        has_('col7', 'default', 'server_default', 'onupdate')
        has_('col8', 'default', 'server_default', 'onupdate', 'server_onupdate')

    @testing.fails_on('firebird', 'Data type unknown')
    def test_insert(self):
        r = t.insert().execute()
        assert r.lastrow_has_defaults()
        eq_(set(r.context.postfetch_cols),
            set([t.c.col3, t.c.col5, t.c.col4, t.c.col6]))

        r = t.insert(inline=True).execute()
        assert r.lastrow_has_defaults()
        eq_(set(r.context.postfetch_cols),
            set([t.c.col3, t.c.col5, t.c.col4, t.c.col6]))

        t.insert().execute()

        ctexec = sa.select([currenttime.label('now')], bind=testing.db).scalar()
        l = t.select().order_by(t.c.col1).execute()
        today = datetime.date.today()
        eq_(l.fetchall(), [
            (x, 'imthedefault', f, ts, ts, ctexec, True, False,
             12, today, 'py')
            for x in range(51, 54)])

        t.insert().execute(col9=None)
        assert r.lastrow_has_defaults()
        eq_(set(r.context.postfetch_cols),
            set([t.c.col3, t.c.col5, t.c.col4, t.c.col6]))

        eq_(t.select(t.c.col1==54).execute().fetchall(),
            [(54, 'imthedefault', f, ts, ts, ctexec, True, False,
              12, today, None)])

    @testing.fails_on('firebird', 'Data type unknown')
    def test_insertmany(self):
        # MySQL-Python 1.2.2 breaks functions in execute_many :(
        if (testing.against('mysql+mysqldb') and
            testing.db.dialect.dbapi.version_info[:3] == (1, 2, 2)):
            return

        r = t.insert().execute({}, {}, {})

        ctexec = currenttime.scalar()
        l = t.select().execute()
        today = datetime.date.today()
        eq_(l.fetchall(),
            [(51, 'imthedefault', f, ts, ts, ctexec, True, False,
              12, today, 'py'),
             (52, 'imthedefault', f, ts, ts, ctexec, True, False,
              12, today, 'py'),
             (53, 'imthedefault', f, ts, ts, ctexec, True, False,
              12, today, 'py')])

    def test_missing_many_param(self):
        assert_raises_message(exc.StatementError, 
            "A value is required for bind parameter 'col7', in parameter group 1",
            t.insert().execute,
            {'col4':7, 'col7':12, 'col8':19},
            {'col4':7, 'col8':19},
            {'col4':7, 'col7':12, 'col8':19},
        )

    def test_insert_values(self):
        t.insert(values={'col3':50}).execute()
        l = t.select().execute()
        eq_(50, l.first()['col3'])

    @testing.fails_on('firebird', 'Data type unknown')
    def test_updatemany(self):
        # MySQL-Python 1.2.2 breaks functions in execute_many :(
        if (testing.against('mysql+mysqldb') and
            testing.db.dialect.dbapi.version_info[:3] == (1, 2, 2)):
            return

        t.insert().execute({}, {}, {})

        t.update(t.c.col1==sa.bindparam('pkval')).execute(
            {'pkval':51,'col7':None, 'col8':None, 'boolcol1':False})

        t.update(t.c.col1==sa.bindparam('pkval')).execute(
            {'pkval':51,},
            {'pkval':52,},
            {'pkval':53,})

        l = t.select().execute()
        ctexec = currenttime.scalar()
        today = datetime.date.today()
        eq_(l.fetchall(),
            [(51, 'im the update', f2, ts, ts, ctexec, False, False,
              13, today, 'py'),
             (52, 'im the update', f2, ts, ts, ctexec, True, False,
              13, today, 'py'),
             (53, 'im the update', f2, ts, ts, ctexec, True, False,
              13, today, 'py')])

    @testing.fails_on('firebird', 'Data type unknown')
    def test_update(self):
        r = t.insert().execute()
        pk = r.inserted_primary_key[0]
        t.update(t.c.col1==pk).execute(col4=None, col5=None)
        ctexec = currenttime.scalar()
        l = t.select(t.c.col1==pk).execute()
        l = l.first()
        eq_(l,
            (pk, 'im the update', f2, None, None, ctexec, True, False,
             13, datetime.date.today(), 'py'))
        eq_(11, f2)

    @testing.fails_on('firebird', 'Data type unknown')
    def test_update_values(self):
        r = t.insert().execute()
        pk = r.inserted_primary_key[0]
        t.update(t.c.col1==pk, values={'col3': 55}).execute()
        l = t.select(t.c.col1==pk).execute()
        l = l.first()
        eq_(55, l['col3'])


class PKDefaultTest(_base.TablesTest):
    __requires__ = ('subqueries',)

    @classmethod
    def define_tables(cls, metadata):
        t2 = Table('t2', metadata,
            Column('nextid', Integer))

        Table('t1', metadata,
              Column('id', Integer, primary_key=True,
                     default=sa.select([func.max(t2.c.nextid)]).as_scalar()),
              Column('data', String(30)))

    @testing.requires.returning
    def test_with_implicit_returning(self):
        self._test(True)

    def test_regular(self):
        self._test(False)

    @testing.resolve_artifact_names
    def _test(self, returning):
        if not returning and not testing.db.dialect.implicit_returning:
            engine = testing.db
        else:
            engine = engines.testing_engine(options={'implicit_returning':returning})
        engine.execute(t2.insert(), nextid=1)
        r = engine.execute(t1.insert(), data='hi')
        eq_([1], r.inserted_primary_key)

        engine.execute(t2.insert(), nextid=2)
        r = engine.execute(t1.insert(), data='there')
        eq_([2], r.inserted_primary_key)

class PKIncrementTest(_base.TablesTest):
    run_define_tables = 'each'

    @classmethod
    def define_tables(cls, metadata):
        Table("aitable", metadata,
              Column('id', Integer, Sequence('ai_id_seq', optional=True),
                     primary_key=True),
              Column('int1', Integer),
              Column('str1', String(20)))

    # TODO: add coverage for increment on a secondary column in a key
    @testing.fails_on('firebird', 'Data type unknown')
    @testing.resolve_artifact_names
    def _test_autoincrement(self, bind):
        ids = set()
        rs = bind.execute(aitable.insert(), int1=1)
        last = rs.inserted_primary_key[0]
        self.assert_(last)
        self.assert_(last not in ids)
        ids.add(last)

        rs = bind.execute(aitable.insert(), str1='row 2')
        last = rs.inserted_primary_key[0]
        self.assert_(last)
        self.assert_(last not in ids)
        ids.add(last)

        rs = bind.execute(aitable.insert(), int1=3, str1='row 3')
        last = rs.inserted_primary_key[0]
        self.assert_(last)
        self.assert_(last not in ids)
        ids.add(last)

        rs = bind.execute(aitable.insert(values={'int1':func.length('four')}))
        last = rs.inserted_primary_key[0]
        self.assert_(last)
        self.assert_(last not in ids)
        ids.add(last)

        eq_(ids, set([1,2,3,4]))

        eq_(list(bind.execute(aitable.select().order_by(aitable.c.id))),
            [(1, 1, None), (2, None, 'row 2'), (3, 3, 'row 3'), (4, 4, None)])

    @testing.resolve_artifact_names
    def test_autoincrement_autocommit(self):
        self._test_autoincrement(testing.db)

    @testing.resolve_artifact_names
    def test_autoincrement_transaction(self):
        con = testing.db.connect()
        tx = con.begin()
        try:
            try:
                self._test_autoincrement(con)
            except:
                try:
                    tx.rollback()
                except:
                    pass
                raise
            else:
                tx.commit()
        finally:
            con.close()


class EmptyInsertTest(testing.TestBase):
    @testing.exclude('sqlite', '<', (3, 3, 8), 'no empty insert support')
    @testing.fails_on('oracle', 'FIXME: unknown')
    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()
            eq_(1, select([func.count(text('*'))], from_obj=t1).scalar())
            eq_(True, t1.select().scalar())
        finally:
            metadata.drop_all()

class AutoIncrementTest(_base.TablesTest):
    __requires__ = ('identity',)
    run_define_tables = 'each'

    @classmethod
    def define_tables(cls, metadata):
        """Each test manipulates self.metadata individually."""

    @testing.exclude('sqlite', '<', (3, 4), 'no database support')
    def test_autoincrement_single_col(self):
        single = Table('single', self.metadata,
                       Column('id', Integer, primary_key=True))
        single.create()

        r = single.insert().execute()
        id_ = r.inserted_primary_key[0]
        eq_(id_, 1)
        eq_(1, sa.select([func.count(sa.text('*'))], from_obj=single).scalar())

    def test_autoincrement_fk(self):
        nodes = Table('nodes', self.metadata,
            Column('id', Integer, primary_key=True),
            Column('parent_id', Integer, ForeignKey('nodes.id')),
            Column('data', String(30)))
        nodes.create()

        r = nodes.insert().execute(data='foo')
        id_ = r.inserted_primary_key[0]
        nodes.insert().execute(data='bar', parent_id=id_)

    @testing.fails_on('sqlite', 'FIXME: unknown')
    def test_non_autoincrement(self):
        # sqlite INT primary keys can be non-unique! (only for ints)
        nonai = Table("nonaitest", self.metadata,
            Column('id', Integer, autoincrement=False, primary_key=True),
            Column('data', String(20)))
        nonai.create()


        try:
            # postgresql + mysql strict will fail on first row,
            # mysql in legacy mode fails on second row
            nonai.insert().execute(data='row 1')
            nonai.insert().execute(data='row 2')
            assert False
        except sa.exc.DBAPIError, e:
            assert True

        nonai.insert().execute(id=1, data='row 1')


class SequenceTest(testing.TestBase, testing.AssertsCompiledSQL):

    @classmethod
    @testing.requires.sequences
    def setup_class(cls):
        global cartitems, sometable, metadata
        metadata = MetaData(testing.db)
        cartitems = Table("cartitems", metadata,
            Column("cart_id", Integer, Sequence('cart_id_seq'), primary_key=True),
            Column("description", String(40)),
            Column("createdate", sa.DateTime())
        )
        sometable = Table( 'Manager', metadata,
               Column('obj_id', Integer, Sequence('obj_id_seq'), ),
               Column('name', String(128)),
               Column('id', Integer, Sequence('Manager_id_seq', optional=True),
                      primary_key=True),
           )

        metadata.create_all()


    def test_compile(self):
        self.assert_compile(
            CreateSequence(Sequence('foo_seq')),
            "CREATE SEQUENCE foo_seq",
            use_default_dialect=True,
        )

        self.assert_compile(
            CreateSequence(Sequence('foo_seq', start=5)),
            "CREATE SEQUENCE foo_seq START WITH 5",
            use_default_dialect=True,
        )

        self.assert_compile(
            CreateSequence(Sequence('foo_seq', increment=2)),
            "CREATE SEQUENCE foo_seq INCREMENT BY 2",
            use_default_dialect=True,
        )

        self.assert_compile(
            CreateSequence(Sequence('foo_seq', increment=2, start=5)),
            "CREATE SEQUENCE foo_seq INCREMENT BY 2 START WITH 5",
            use_default_dialect=True,
        )

        self.assert_compile(
            DropSequence(Sequence('foo_seq')),
            "DROP SEQUENCE foo_seq",
            use_default_dialect=True,
        )


    @testing.fails_on('firebird', 'no FB support for start/increment')
    @testing.requires.sequences
    def test_start_increment(self):
        for seq in (
                Sequence('foo_seq'), 
                Sequence('foo_seq', start=8), 
                Sequence('foo_seq', increment=5)):
            seq.create(testing.db)
            try:
                values = [
                    testing.db.execute(seq) for i in range(3)
                ]
                start = seq.start or 1
                inc = seq.increment or 1
                assert values == list(xrange(start, start + inc * 3, inc))

            finally:
                seq.drop(testing.db)

    @testing.requires.sequences
    def test_seq_nonpk(self):
        """test sequences fire off as defaults on non-pk columns"""

        engine = engines.testing_engine(options={'implicit_returning':False})
        result = engine.execute(sometable.insert(), name="somename")

        assert set(result.postfetch_cols()) == set([sometable.c.obj_id])

        result = engine.execute(sometable.insert(), name="someother")
        assert set(result.postfetch_cols()) == set([sometable.c.obj_id])

        sometable.insert().execute(
            {'name':'name3'},
            {'name':'name4'})
        eq_(sometable.select().order_by(sometable.c.id).execute().fetchall(),
            [(1, "somename", 1),
             (2, "someother", 2),
             (3, "name3", 3),
             (4, "name4", 4)])

    @testing.requires.sequences
    def test_sequence(self):
        cartitems.insert().execute(description='hi')
        cartitems.insert().execute(description='there')
        r = cartitems.insert().execute(description='lala')

        assert r.inserted_primary_key and r.inserted_primary_key[0] is not None
        id_ = r.inserted_primary_key[0]

        eq_(1,
            sa.select([func.count(cartitems.c.cart_id)],
                      sa.and_(cartitems.c.description == 'lala',
                              cartitems.c.cart_id == id_)).scalar())

        cartitems.select().execute().fetchall()

    @testing.fails_on('maxdb', 'FIXME: unknown')
    # maxdb db-api seems to double-execute NEXTVAL internally somewhere,
    # throwing off the numbers for these tests...
    @testing.requires.sequences
    def test_implicit_sequence_exec(self):
        s = Sequence("my_sequence", metadata=MetaData(testing.db))
        s.create()
        try:
            x = s.execute()
            eq_(x, 1)
        finally:
            s.drop()

    @testing.fails_on('maxdb', 'FIXME: unknown')
    @testing.requires.sequences
    def teststandalone_explicit(self):
        s = Sequence("my_sequence")
        s.create(bind=testing.db)
        try:
            x = s.execute(testing.db)
            eq_(x, 1)
        finally:
            s.drop(testing.db)

    @testing.requires.sequences
    def test_checkfirst(self):
        s = Sequence("my_sequence")
        s.create(testing.db, checkfirst=False)
        s.create(testing.db, checkfirst=True)
        s.drop(testing.db, checkfirst=False)
        s.drop(testing.db, checkfirst=True)

    @testing.fails_on('maxdb', 'FIXME: unknown')
    @testing.requires.sequences
    def teststandalone2(self):
        x = cartitems.c.cart_id.default.execute()
        self.assert_(1 <= x <= 4)

    @classmethod
    @testing.requires.sequences
    def teardown_class(cls):
        metadata.drop_all()


class SpecialTypePKTest(testing.TestBase):
    """test process_result_value in conjunction with primary key columns.
    
    Also tests that "autoincrement" checks are against column.type._type_affinity,
    rather than the class of "type" itself.
    
    """

    @classmethod
    def setup_class(cls):
        class MyInteger(TypeDecorator):
            impl = Integer
            def process_bind_param(self, value, dialect):
                if value is None:
                    return None
                return int(value[4:])

            def process_result_value(self, value, dialect):
                if value is None:
                    return None
                return "INT_%d" % value

        cls.MyInteger = MyInteger

    @testing.provide_metadata
    def _run_test(self, *arg, **kw):
        implicit_returning = kw.pop('implicit_returning', True)
        kw['primary_key'] = True
        if kw.get('autoincrement', True):
            kw['test_needs_autoincrement'] = True
        t = Table('x', metadata,
            Column('y', self.MyInteger, *arg, **kw),
            Column('data', Integer),
            implicit_returning=implicit_returning
        )

        t.create()
        r = t.insert().values(data=5).execute()

        # we don't pre-fetch 'server_default'.
        if 'server_default' in kw and (not testing.db.dialect.implicit_returning or not implicit_returning):
            eq_(r.inserted_primary_key, [None])
        else:
            eq_(r.inserted_primary_key, ['INT_1'])
        r.close()

        eq_(
            t.select().execute().first(),
            ('INT_1', 5)
        )

    def test_plain(self):
        # among other things, tests that autoincrement
        # is enabled.
        self._run_test()

    def test_literal_default_label(self):
        self._run_test(default=literal("INT_1", type_=self.MyInteger).label('foo'))

    def test_literal_default_no_label(self):
        self._run_test(default=literal("INT_1", type_=self.MyInteger))

    def test_sequence(self):
        self._run_test(Sequence('foo_seq'))

    def test_server_default(self):
        self._run_test(server_default='1',)

    def test_server_default_no_autoincrement(self):
        self._run_test(server_default='1', autoincrement=False)

    def test_clause(self):
        stmt = select([literal("INT_1", type_=self.MyInteger)]).as_scalar()
        self._run_test(default=stmt)

    @testing.requires.returning
    def test_no_implicit_returning(self):
        self._run_test(implicit_returning=False)

    @testing.requires.returning
    def test_server_default_no_implicit_returning(self):
        self._run_test(server_default='1', autoincrement=False)

class ServerDefaultsOnPKTest(testing.TestBase):
    @testing.provide_metadata
    def test_string_default_none_on_insert(self):
        """Test that without implicit returning, we return None for 
        a string server default.  
        
        That is, we don't want to attempt to pre-execute "server_default"
        generically - the user should use a Python side-default for a case
        like this.   Testing that all backends do the same thing here.
        
        """
        t = Table('x', metadata, 
                Column('y', String(10), server_default='key_one', primary_key=True),
                Column('data', String(10)),
                implicit_returning=False
                )
        metadata.create_all()
        r = t.insert().execute(data='data')
        eq_(r.inserted_primary_key, [None])
        eq_(
            t.select().execute().fetchall(),
            [('key_one', 'data')]
        )

    @testing.requires.returning
    @testing.provide_metadata
    def test_string_default_on_insert_with_returning(self):
        """With implicit_returning, we get a string PK default back no problem."""
        t = Table('x', metadata, 
                Column('y', String(10), server_default='key_one', primary_key=True),
                Column('data', String(10))
                )
        metadata.create_all()
        r = t.insert().execute(data='data')
        eq_(r.inserted_primary_key, ['key_one'])
        eq_(
            t.select().execute().fetchall(),
            [('key_one', 'data')]
        )

    @testing.provide_metadata
    def test_int_default_none_on_insert(self):
        t = Table('x', metadata, 
                Column('y', Integer, 
                        server_default='5', primary_key=True),
                Column('data', String(10)),
                implicit_returning=False
                )
        assert t._autoincrement_column is None
        metadata.create_all()
        r = t.insert().execute(data='data')
        eq_(r.inserted_primary_key, [None])
        if testing.against('sqlite'):
            eq_(
                t.select().execute().fetchall(),
                [(1, 'data')]
            )
        else:
            eq_(
                t.select().execute().fetchall(),
                [(5, 'data')]
            )
    @testing.provide_metadata
    def test_autoincrement_reflected_from_server_default(self):
        t = Table('x', metadata, 
                Column('y', Integer, 
                        server_default='5', primary_key=True),
                Column('data', String(10)),
                implicit_returning=False
                )
        assert t._autoincrement_column is None
        metadata.create_all()

        m2 = MetaData(metadata.bind)
        t2 = Table('x', m2, autoload=True, implicit_returning=False)
        assert t2._autoincrement_column is None

    @testing.provide_metadata
    def test_int_default_none_on_insert_reflected(self):
        t = Table('x', metadata, 
                Column('y', Integer, 
                        server_default='5', primary_key=True),
                Column('data', String(10)),
                implicit_returning=False
                )
        metadata.create_all()

        m2 = MetaData(metadata.bind)
        t2 = Table('x', m2, autoload=True, implicit_returning=False)

        r = t2.insert().execute(data='data')
        eq_(r.inserted_primary_key, [None])
        if testing.against('sqlite'):
            eq_(
                t2.select().execute().fetchall(),
                [(1, 'data')]
            )
        else:
            eq_(
                t2.select().execute().fetchall(),
                [(5, 'data')]
            )

    @testing.requires.returning
    @testing.provide_metadata
    def test_int_default_on_insert_with_returning(self):
        t = Table('x', metadata, 
                Column('y', Integer, 
                        server_default='5', primary_key=True),
                Column('data', String(10))
                )

        metadata.create_all()
        r = t.insert().execute(data='data')
        eq_(r.inserted_primary_key, [5])
        eq_(
            t.select().execute().fetchall(),
            [(5, 'data')]
        )