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from contextlib import contextmanager
import pickle
import sqlalchemy as tsa
from sqlalchemy import ARRAY
from sqlalchemy import bindparam
from sqlalchemy import BLANK_SCHEMA
from sqlalchemy import Boolean
from sqlalchemy import CheckConstraint
from sqlalchemy import Column
from sqlalchemy import ColumnDefault
from sqlalchemy import desc
from sqlalchemy import Enum
from sqlalchemy import event
from sqlalchemy import exc
from sqlalchemy import ForeignKey
from sqlalchemy import ForeignKeyConstraint
from sqlalchemy import func
from sqlalchemy import Index
from sqlalchemy import Integer
from sqlalchemy import MetaData
from sqlalchemy import PrimaryKeyConstraint
from sqlalchemy import schema
from sqlalchemy import Sequence
from sqlalchemy import String
from sqlalchemy import Table
from sqlalchemy import testing
from sqlalchemy import text
from sqlalchemy import TypeDecorator
from sqlalchemy import types as sqltypes
from sqlalchemy import Unicode
from sqlalchemy import UniqueConstraint
from sqlalchemy.engine import default
from sqlalchemy.schema import AddConstraint
from sqlalchemy.schema import CreateIndex
from sqlalchemy.schema import DefaultClause
from sqlalchemy.schema import DropIndex
from sqlalchemy.sql import naming
from sqlalchemy.sql import operators
from sqlalchemy.sql.elements import _NONE_NAME
from sqlalchemy.testing import assert_raises
from sqlalchemy.testing import assert_raises_message
from sqlalchemy.testing import AssertsCompiledSQL
from sqlalchemy.testing import ComparesTables
from sqlalchemy.testing import emits_warning
from sqlalchemy.testing import eq_
from sqlalchemy.testing import fixtures
from sqlalchemy.testing import is_
from sqlalchemy.testing import is_false
from sqlalchemy.testing import is_true
from sqlalchemy.testing import mock
class MetaDataTest(fixtures.TestBase, ComparesTables):
def test_metadata_contains(self):
metadata = MetaData()
t1 = Table("t1", metadata, Column("x", Integer))
t2 = Table("t2", metadata, Column("x", Integer), schema="foo")
t3 = Table("t2", MetaData(), Column("x", Integer))
t4 = Table("t1", MetaData(), Column("x", Integer), schema="foo")
assert "t1" in metadata
assert "foo.t2" in metadata
assert "t2" not in metadata
assert "foo.t1" not in metadata
assert t1 in metadata
assert t2 in metadata
assert t3 not in metadata
assert t4 not in metadata
def test_uninitialized_column_copy(self):
for col in [
Column("foo", String(), nullable=False),
Column("baz", String(), unique=True),
Column(Integer(), primary_key=True),
Column(
"bar",
Integer(),
Sequence("foo_seq"),
primary_key=True,
key="bar",
),
Column(Integer(), ForeignKey("bat.blah"), doc="this is a col"),
Column(
"bar",
Integer(),
ForeignKey("bat.blah"),
primary_key=True,
key="bar",
),
Column("bar", Integer(), info={"foo": "bar"}),
]:
c2 = col.copy()
for attr in (
"name",
"type",
"nullable",
"primary_key",
"key",
"unique",
"info",
"doc",
):
eq_(getattr(col, attr), getattr(c2, attr))
eq_(len(col.foreign_keys), len(c2.foreign_keys))
if col.default:
eq_(c2.default.name, "foo_seq")
for a1, a2 in zip(col.foreign_keys, c2.foreign_keys):
assert a1 is not a2
eq_(a2._colspec, "bat.blah")
def test_col_subclass_copy(self):
class MyColumn(schema.Column):
def __init__(self, *args, **kw):
self.widget = kw.pop("widget", None)
super(MyColumn, self).__init__(*args, **kw)
def copy(self, *arg, **kw):
c = super(MyColumn, self).copy(*arg, **kw)
c.widget = self.widget
return c
c1 = MyColumn("foo", Integer, widget="x")
c2 = c1.copy()
assert isinstance(c2, MyColumn)
eq_(c2.widget, "x")
def test_uninitialized_column_copy_events(self):
msgs = []
def write(c, t):
msgs.append("attach %s.%s" % (t.name, c.name))
c1 = Column("foo", String())
m = MetaData()
for i in range(3):
cx = c1.copy()
# as of 0.7, these events no longer copy. its expected
# that listeners will be re-established from the
# natural construction of things.
cx._on_table_attach(write)
Table("foo%d" % i, m, cx)
eq_(msgs, ["attach foo0.foo", "attach foo1.foo", "attach foo2.foo"])
def test_schema_collection_add(self):
metadata = MetaData()
Table("t1", metadata, Column("x", Integer), schema="foo")
Table("t2", metadata, Column("x", Integer), schema="bar")
Table("t3", metadata, Column("x", Integer))
eq_(metadata._schemas, set(["foo", "bar"]))
eq_(len(metadata.tables), 3)
def test_schema_collection_remove(self):
metadata = MetaData()
t1 = Table("t1", metadata, Column("x", Integer), schema="foo")
Table("t2", metadata, Column("x", Integer), schema="bar")
t3 = Table("t3", metadata, Column("x", Integer), schema="bar")
metadata.remove(t3)
eq_(metadata._schemas, set(["foo", "bar"]))
eq_(len(metadata.tables), 2)
metadata.remove(t1)
eq_(metadata._schemas, set(["bar"]))
eq_(len(metadata.tables), 1)
def test_schema_collection_remove_all(self):
metadata = MetaData()
Table("t1", metadata, Column("x", Integer), schema="foo")
Table("t2", metadata, Column("x", Integer), schema="bar")
metadata.clear()
eq_(metadata._schemas, set())
eq_(len(metadata.tables), 0)
def test_metadata_tables_immutable(self):
# this use case was added due to #1917.
metadata = MetaData()
Table("t1", metadata, Column("x", Integer))
assert "t1" in metadata.tables
assert_raises(TypeError, lambda: metadata.tables.pop("t1"))
@testing.provide_metadata
def test_dupe_tables(self):
metadata = self.metadata
Table(
"table1",
metadata,
Column("col1", Integer, primary_key=True),
Column("col2", String(20)),
)
metadata.create_all()
Table("table1", metadata, autoload=True)
def go():
Table(
"table1",
metadata,
Column("col1", Integer, primary_key=True),
Column("col2", String(20)),
)
assert_raises_message(
tsa.exc.InvalidRequestError,
"Table 'table1' is already defined for this "
"MetaData instance. Specify 'extend_existing=True' "
"to redefine options and columns on an existing "
"Table object.",
go,
)
def test_fk_copy(self):
c1 = Column("foo", Integer)
c2 = Column("bar", Integer)
m = MetaData()
t1 = Table("t", m, c1, c2)
kw = dict(
onupdate="X",
ondelete="Y",
use_alter=True,
name="f1",
deferrable="Z",
initially="Q",
link_to_name=True,
)
fk1 = ForeignKey(c1, **kw)
fk2 = ForeignKeyConstraint((c1,), (c2,), **kw)
t1.append_constraint(fk2)
fk1c = fk1.copy()
fk2c = fk2.copy()
for k in kw:
eq_(getattr(fk1c, k), kw[k])
eq_(getattr(fk2c, k), kw[k])
def test_check_constraint_copy(self):
def r(x):
return x
c = CheckConstraint(
"foo bar",
name="name",
initially=True,
deferrable=True,
_create_rule=r,
)
c2 = c.copy()
eq_(c2.name, "name")
eq_(str(c2.sqltext), "foo bar")
eq_(c2.initially, True)
eq_(c2.deferrable, True)
assert c2._create_rule is r
def test_col_replace_w_constraint(self):
m = MetaData()
a = Table("a", m, Column("id", Integer, primary_key=True))
aid = Column("a_id", ForeignKey("a.id"))
b = Table("b", m, aid)
b.append_column(aid)
assert b.c.a_id.references(a.c.id)
eq_(len(b.constraints), 2)
def test_fk_construct(self):
c1 = Column("foo", Integer)
c2 = Column("bar", Integer)
m = MetaData()
t1 = Table("t", m, c1, c2)
fk1 = ForeignKeyConstraint(("foo",), ("bar",), table=t1)
assert fk1 in t1.constraints
def test_fk_constraint_col_collection_w_table(self):
c1 = Column("foo", Integer)
c2 = Column("bar", Integer)
m = MetaData()
t1 = Table("t", m, c1, c2)
fk1 = ForeignKeyConstraint(("foo",), ("bar",), table=t1)
eq_(dict(fk1.columns), {"foo": c1})
def test_fk_constraint_col_collection_no_table(self):
fk1 = ForeignKeyConstraint(("foo", "bat"), ("bar", "hoho"))
eq_(dict(fk1.columns), {})
eq_(fk1.column_keys, ["foo", "bat"])
eq_(fk1._col_description, "foo, bat")
eq_(fk1._elements, {"foo": fk1.elements[0], "bat": fk1.elements[1]})
def test_fk_constraint_col_collection_no_table_real_cols(self):
c1 = Column("foo", Integer)
c2 = Column("bar", Integer)
fk1 = ForeignKeyConstraint((c1,), (c2,))
eq_(dict(fk1.columns), {})
eq_(fk1.column_keys, ["foo"])
eq_(fk1._col_description, "foo")
eq_(fk1._elements, {"foo": fk1.elements[0]})
def test_fk_constraint_col_collection_added_to_table(self):
c1 = Column("foo", Integer)
m = MetaData()
fk1 = ForeignKeyConstraint(("foo",), ("bar",))
Table("t", m, c1, fk1)
eq_(dict(fk1.columns), {"foo": c1})
eq_(fk1._elements, {"foo": fk1.elements[0]})
def test_fk_constraint_col_collection_via_fk(self):
fk = ForeignKey("bar")
c1 = Column("foo", Integer, fk)
m = MetaData()
t1 = Table("t", m, c1)
fk1 = fk.constraint
eq_(fk1.column_keys, ["foo"])
assert fk1 in t1.constraints
eq_(fk1.column_keys, ["foo"])
eq_(dict(fk1.columns), {"foo": c1})
eq_(fk1._elements, {"foo": fk})
def test_fk_no_such_parent_col_error(self):
meta = MetaData()
a = Table("a", meta, Column("a", Integer))
Table("b", meta, Column("b", Integer))
def go():
a.append_constraint(ForeignKeyConstraint(["x"], ["b.b"]))
assert_raises_message(
exc.ArgumentError,
"Can't create ForeignKeyConstraint on "
"table 'a': no column named 'x' is present.",
go,
)
def test_fk_given_non_col(self):
not_a_col = bindparam("x")
assert_raises_message(
exc.ArgumentError,
"String column name or Column object for DDL foreign "
"key constraint expected, got .*Bind",
ForeignKey,
not_a_col,
)
def test_fk_given_non_col_clauseelem(self):
class Foo(object):
def __clause_element__(self):
return bindparam("x")
assert_raises_message(
exc.ArgumentError,
"String column name or Column object for DDL foreign "
"key constraint expected, got .*Foo",
ForeignKey,
Foo(),
)
def test_fk_given_col_non_table(self):
t = Table("t", MetaData(), Column("x", Integer))
xa = t.alias().c.x
assert_raises_message(
exc.ArgumentError,
"ForeignKey received Column not bound to a Table, got: .*Alias",
ForeignKey,
xa,
)
def test_fk_given_col_non_table_clauseelem(self):
t = Table("t", MetaData(), Column("x", Integer))
class Foo(object):
def __clause_element__(self):
return t.alias().c.x
assert_raises_message(
exc.ArgumentError,
"ForeignKey received Column not bound to a Table, got: .*Alias",
ForeignKey,
Foo(),
)
def test_fk_no_such_target_col_error_upfront(self):
meta = MetaData()
a = Table("a", meta, Column("a", Integer))
Table("b", meta, Column("b", Integer))
a.append_constraint(ForeignKeyConstraint(["a"], ["b.x"]))
assert_raises_message(
exc.NoReferencedColumnError,
"Could not initialize target column for ForeignKey 'b.x' on "
"table 'a': table 'b' has no column named 'x'",
getattr,
list(a.foreign_keys)[0],
"column",
)
def test_fk_no_such_target_col_error_delayed(self):
meta = MetaData()
a = Table("a", meta, Column("a", Integer))
a.append_constraint(ForeignKeyConstraint(["a"], ["b.x"]))
Table("b", meta, Column("b", Integer))
assert_raises_message(
exc.NoReferencedColumnError,
"Could not initialize target column for ForeignKey 'b.x' on "
"table 'a': table 'b' has no column named 'x'",
getattr,
list(a.foreign_keys)[0],
"column",
)
def test_fk_mismatched_local_remote_cols(self):
assert_raises_message(
exc.ArgumentError,
"ForeignKeyConstraint number of constrained columns must "
"match the number of referenced columns.",
ForeignKeyConstraint,
["a"],
["b.a", "b.b"],
)
assert_raises_message(
exc.ArgumentError,
"ForeignKeyConstraint number of constrained columns "
"must match the number of referenced columns.",
ForeignKeyConstraint,
["a", "b"],
["b.a"],
)
assert_raises_message(
exc.ArgumentError,
"ForeignKeyConstraint with duplicate source column "
"references are not supported.",
ForeignKeyConstraint,
["a", "a"],
["b.a", "b.b"],
)
def test_pickle_metadata_sequence_restated(self):
m1 = MetaData()
Table(
"a",
m1,
Column("id", Integer, primary_key=True),
Column("x", Integer, Sequence("x_seq")),
)
m2 = pickle.loads(pickle.dumps(m1))
s2 = Sequence("x_seq")
t2 = Table(
"a",
m2,
Column("id", Integer, primary_key=True),
Column("x", Integer, s2),
extend_existing=True,
)
assert m2._sequences["x_seq"] is t2.c.x.default
assert m2._sequences["x_seq"] is s2
def test_sequence_restated_replaced(self):
"""Test restatement of Sequence replaces."""
m1 = MetaData()
s1 = Sequence("x_seq")
t = Table("a", m1, Column("x", Integer, s1))
assert m1._sequences["x_seq"] is s1
s2 = Sequence("x_seq")
Table("a", m1, Column("x", Integer, s2), extend_existing=True)
assert t.c.x.default is s2
assert m1._sequences["x_seq"] is s2
def test_sequence_attach_to_table(self):
m1 = MetaData()
s1 = Sequence("s")
Table("a", m1, Column("x", Integer, s1))
assert s1.metadata is m1
def test_sequence_attach_to_existing_table(self):
m1 = MetaData()
s1 = Sequence("s")
t = Table("a", m1, Column("x", Integer))
t.c.x._init_items(s1)
assert s1.metadata is m1
def test_pickle_metadata_sequence_implicit(self):
m1 = MetaData()
Table(
"a",
m1,
Column("id", Integer, primary_key=True),
Column("x", Integer, Sequence("x_seq")),
)
m2 = pickle.loads(pickle.dumps(m1))
t2 = Table("a", m2, extend_existing=True)
eq_(m2._sequences, {"x_seq": t2.c.x.default})
def test_pickle_metadata_schema(self):
m1 = MetaData()
Table(
"a",
m1,
Column("id", Integer, primary_key=True),
Column("x", Integer, Sequence("x_seq")),
schema="y",
)
m2 = pickle.loads(pickle.dumps(m1))
Table("a", m2, schema="y", extend_existing=True)
eq_(m2._schemas, m1._schemas)
def test_metadata_schema_arg(self):
m1 = MetaData(schema="sch1")
m2 = MetaData(schema="sch1", quote_schema=True)
m3 = MetaData(schema="sch1", quote_schema=False)
m4 = MetaData()
for (
i,
(
name,
metadata,
schema_,
quote_schema,
exp_schema,
exp_quote_schema,
),
) in enumerate(
[
("t1", m1, None, None, "sch1", None),
("t2", m1, "sch2", None, "sch2", None),
("t3", m1, "sch2", True, "sch2", True),
("t4", m1, "sch1", None, "sch1", None),
("t5", m1, BLANK_SCHEMA, None, None, None),
("t1", m2, None, None, "sch1", True),
("t2", m2, "sch2", None, "sch2", None),
("t3", m2, "sch2", True, "sch2", True),
("t4", m2, "sch1", None, "sch1", None),
("t1", m3, None, None, "sch1", False),
("t2", m3, "sch2", None, "sch2", None),
("t3", m3, "sch2", True, "sch2", True),
("t4", m3, "sch1", None, "sch1", None),
("t1", m4, None, None, None, None),
("t2", m4, "sch2", None, "sch2", None),
("t3", m4, "sch2", True, "sch2", True),
("t4", m4, "sch1", None, "sch1", None),
("t5", m4, BLANK_SCHEMA, None, None, None),
]
):
kw = {}
if schema_ is not None:
kw["schema"] = schema_
if quote_schema is not None:
kw["quote_schema"] = quote_schema
t = Table(name, metadata, **kw)
eq_(t.schema, exp_schema, "test %d, table schema" % i)
eq_(
t.schema.quote if t.schema is not None else None,
exp_quote_schema,
"test %d, table quote_schema" % i,
)
seq = Sequence(name, metadata=metadata, **kw)
eq_(seq.schema, exp_schema, "test %d, seq schema" % i)
eq_(
seq.schema.quote if seq.schema is not None else None,
exp_quote_schema,
"test %d, seq quote_schema" % i,
)
def test_manual_dependencies(self):
meta = MetaData()
a = Table("a", meta, Column("foo", Integer))
b = Table("b", meta, Column("foo", Integer))
c = Table("c", meta, Column("foo", Integer))
d = Table("d", meta, Column("foo", Integer))
e = Table("e", meta, Column("foo", Integer))
e.add_is_dependent_on(c)
a.add_is_dependent_on(b)
b.add_is_dependent_on(d)
e.add_is_dependent_on(b)
c.add_is_dependent_on(a)
eq_(meta.sorted_tables, [d, b, a, c, e])
def test_deterministic_order(self):
meta = MetaData()
a = Table("a", meta, Column("foo", Integer))
b = Table("b", meta, Column("foo", Integer))
c = Table("c", meta, Column("foo", Integer))
d = Table("d", meta, Column("foo", Integer))
e = Table("e", meta, Column("foo", Integer))
e.add_is_dependent_on(c)
a.add_is_dependent_on(b)
eq_(meta.sorted_tables, [b, c, d, a, e])
def test_fks_deterministic_order(self):
meta = MetaData()
a = Table("a", meta, Column("foo", Integer, ForeignKey("b.foo")))
b = Table("b", meta, Column("foo", Integer))
c = Table("c", meta, Column("foo", Integer))
d = Table("d", meta, Column("foo", Integer))
e = Table("e", meta, Column("foo", Integer, ForeignKey("c.foo")))
eq_(meta.sorted_tables, [b, c, d, a, e])
def test_cycles_fks_warning_one(self):
meta = MetaData()
a = Table("a", meta, Column("foo", Integer, ForeignKey("b.foo")))
b = Table("b", meta, Column("foo", Integer, ForeignKey("d.foo")))
c = Table("c", meta, Column("foo", Integer, ForeignKey("b.foo")))
d = Table("d", meta, Column("foo", Integer, ForeignKey("c.foo")))
e = Table("e", meta, Column("foo", Integer))
with testing.expect_warnings(
"Cannot correctly sort tables; there are unresolvable cycles "
'between tables "b, c, d", which is usually caused by mutually '
"dependent foreign key constraints. "
"Foreign key constraints involving these tables will not be "
"considered"
):
eq_(meta.sorted_tables, [b, c, d, e, a])
def test_cycles_fks_warning_two(self):
meta = MetaData()
a = Table("a", meta, Column("foo", Integer, ForeignKey("b.foo")))
b = Table("b", meta, Column("foo", Integer, ForeignKey("a.foo")))
c = Table("c", meta, Column("foo", Integer, ForeignKey("e.foo")))
d = Table("d", meta, Column("foo", Integer))
e = Table("e", meta, Column("foo", Integer, ForeignKey("d.foo")))
with testing.expect_warnings(
"Cannot correctly sort tables; there are unresolvable cycles "
'between tables "a, b", which is usually caused by mutually '
"dependent foreign key constraints. "
"Foreign key constraints involving these tables will not be "
"considered"
):
eq_(meta.sorted_tables, [a, b, d, e, c])
def test_cycles_fks_fks_delivered_separately(self):
meta = MetaData()
a = Table("a", meta, Column("foo", Integer, ForeignKey("b.foo")))
b = Table("b", meta, Column("foo", Integer, ForeignKey("a.foo")))
c = Table("c", meta, Column("foo", Integer, ForeignKey("e.foo")))
d = Table("d", meta, Column("foo", Integer))
e = Table("e", meta, Column("foo", Integer, ForeignKey("d.foo")))
results = schema.sort_tables_and_constraints(
sorted(meta.tables.values(), key=lambda t: t.key)
)
results[-1] = (None, set(results[-1][-1]))
eq_(
results,
[
(a, set()),
(b, set()),
(d, {fk.constraint for fk in d.foreign_keys}),
(e, {fk.constraint for fk in e.foreign_keys}),
(c, {fk.constraint for fk in c.foreign_keys}),
(
None,
{fk.constraint for fk in a.foreign_keys}.union(
fk.constraint for fk in b.foreign_keys
),
),
],
)
def test_cycles_fks_usealter(self):
meta = MetaData()
a = Table("a", meta, Column("foo", Integer, ForeignKey("b.foo")))
b = Table(
"b",
meta,
Column("foo", Integer, ForeignKey("d.foo", use_alter=True)),
)
c = Table("c", meta, Column("foo", Integer, ForeignKey("b.foo")))
d = Table("d", meta, Column("foo", Integer, ForeignKey("c.foo")))
e = Table("e", meta, Column("foo", Integer))
eq_(meta.sorted_tables, [b, e, a, c, d])
def test_nonexistent(self):
assert_raises(
tsa.exc.NoSuchTableError,
Table,
"fake_table",
MetaData(testing.db),
autoload=True,
)
def test_assorted_repr(self):
t1 = Table("foo", MetaData(), Column("x", Integer))
i1 = Index("bar", t1.c.x)
ck = schema.CheckConstraint("x > y", name="someconstraint")
for const, exp in (
(Sequence("my_seq"), "Sequence('my_seq')"),
(Sequence("my_seq", start=5), "Sequence('my_seq', start=5)"),
(Column("foo", Integer), "Column('foo', Integer(), table=None)"),
(
Column(
"foo",
Integer,
primary_key=True,
nullable=False,
onupdate=1,
default=42,
server_default="42",
comment="foo",
),
"Column('foo', Integer(), table=None, primary_key=True, "
"nullable=False, onupdate=%s, default=%s, server_default=%s, "
"comment='foo')"
% (ColumnDefault(1), ColumnDefault(42), DefaultClause("42"),),
),
(
Table("bar", MetaData(), Column("x", String)),
"Table('bar', MetaData(bind=None), "
"Column('x', String(), table=<bar>), schema=None)",
),
(
schema.DefaultGenerator(for_update=True),
"DefaultGenerator(for_update=True)",
),
(schema.Index("bar", "c"), "Index('bar', 'c')"),
(i1, "Index('bar', Column('x', Integer(), table=<foo>))"),
(schema.FetchedValue(), "FetchedValue()"),
(
ck,
"CheckConstraint("
"%s"
", name='someconstraint')" % repr(ck.sqltext),
),
(ColumnDefault(("foo", "bar")), "ColumnDefault(('foo', 'bar'))"),
):
eq_(repr(const), exp)
class ToMetaDataTest(fixtures.TestBase, ComparesTables):
@testing.requires.check_constraints
def test_copy(self):
# TODO: modernize this test for 2.0
from sqlalchemy.testing.schema import Table
meta = MetaData()
table = Table(
"mytable",
meta,
Column("myid", Integer, Sequence("foo_id_seq"), primary_key=True),
Column("name", String(40), nullable=True),
Column(
"foo",
String(40),
nullable=False,
server_default="x",
server_onupdate="q",
),
Column(
"bar", String(40), nullable=False, default="y", onupdate="z"
),
Column(
"description", String(30), CheckConstraint("description='hi'")
),
UniqueConstraint("name"),
test_needs_fk=True,
)
table2 = Table(
"othertable",
meta,
Column("id", Integer, Sequence("foo_seq"), primary_key=True),
Column("myid", Integer, ForeignKey("mytable.myid")),
test_needs_fk=True,
)
table3 = Table(
"has_comments",
meta,
Column("foo", Integer, comment="some column"),
comment="table comment",
)
def test_to_metadata():
meta2 = MetaData()
table_c = table.tometadata(meta2)
table2_c = table2.tometadata(meta2)
table3_c = table3.tometadata(meta2)
return (table_c, table2_c, table3_c)
def test_pickle():
meta.bind = testing.db
meta2 = pickle.loads(pickle.dumps(meta))
assert meta2.bind is None
pickle.loads(pickle.dumps(meta2))
return (
meta2.tables["mytable"],
meta2.tables["othertable"],
meta2.tables["has_comments"],
)
def test_pickle_via_reflect():
# this is the most common use case, pickling the results of a
# database reflection
meta2 = MetaData(bind=testing.db)
t1 = Table("mytable", meta2, autoload=True)
Table("othertable", meta2, autoload=True)
Table("has_comments", meta2, autoload=True)
meta3 = pickle.loads(pickle.dumps(meta2))
assert meta3.bind is None
assert meta3.tables["mytable"] is not t1
return (
meta3.tables["mytable"],
meta3.tables["othertable"],
meta3.tables["has_comments"],
)
meta.create_all(testing.db)
try:
for test, has_constraints, reflect in (
(test_to_metadata, True, False),
(test_pickle, True, False),
(test_pickle_via_reflect, False, True),
):
table_c, table2_c, table3_c = test()
self.assert_tables_equal(table, table_c)
self.assert_tables_equal(table2, table2_c)
assert table is not table_c
assert table.primary_key is not table_c.primary_key
assert (
list(table2_c.c.myid.foreign_keys)[0].column
is table_c.c.myid
)
assert (
list(table2_c.c.myid.foreign_keys)[0].column
is not table.c.myid
)
assert "x" in str(table_c.c.foo.server_default.arg)
if not reflect:
assert isinstance(table_c.c.myid.default, Sequence)
assert str(table_c.c.foo.server_onupdate.arg) == "q"
assert str(table_c.c.bar.default.arg) == "y"
assert (
getattr(
table_c.c.bar.onupdate.arg,
"arg",
table_c.c.bar.onupdate.arg,
)
== "z"
)
assert isinstance(table2_c.c.id.default, Sequence)
# constraints don't get reflected for any dialect right
# now
if has_constraints:
for c in table_c.c.description.constraints:
if isinstance(c, CheckConstraint):
break
else:
assert False
assert str(c.sqltext) == "description='hi'"
for c in table_c.constraints:
if isinstance(c, UniqueConstraint):
break
else:
assert False
assert c.columns.contains_column(table_c.c.name)
assert not c.columns.contains_column(table.c.name)
if testing.requires.comment_reflection.enabled:
eq_(table3_c.comment, "table comment")
eq_(table3_c.c.foo.comment, "some column")
finally:
meta.drop_all(testing.db)
def test_col_key_fk_parent(self):
# test #2643
m1 = MetaData()
a = Table("a", m1, Column("x", Integer))
b = Table("b", m1, Column("x", Integer, ForeignKey("a.x"), key="y"))
assert b.c.y.references(a.c.x)
m2 = MetaData()
b2 = b.tometadata(m2)
a2 = a.tometadata(m2)
assert b2.c.y.references(a2.c.x)
def test_change_schema(self):
meta = MetaData()
table = Table(
"mytable",
meta,
Column("myid", Integer, primary_key=True),
Column("name", String(40), nullable=True),
Column(
"description", String(30), CheckConstraint("description='hi'")
),
UniqueConstraint("name"),
)
table2 = Table(
"othertable",
meta,
Column("id", Integer, primary_key=True),
Column("myid", Integer, ForeignKey("mytable.myid")),
)
meta2 = MetaData()
table_c = table.tometadata(meta2, schema="someschema")
table2_c = table2.tometadata(meta2, schema="someschema")
eq_(
str(table_c.join(table2_c).onclause),
str(table_c.c.myid == table2_c.c.myid),
)
eq_(
str(table_c.join(table2_c).onclause),
"someschema.mytable.myid = someschema.othertable.myid",
)
def test_retain_table_schema(self):
meta = MetaData()
table = Table(
"mytable",
meta,
Column("myid", Integer, primary_key=True),
Column("name", String(40), nullable=True),
Column(
"description", String(30), CheckConstraint("description='hi'")
),
UniqueConstraint("name"),
schema="myschema",
)
table2 = Table(
"othertable",
meta,
Column("id", Integer, primary_key=True),
Column("myid", Integer, ForeignKey("myschema.mytable.myid")),
schema="myschema",
)
meta2 = MetaData()
table_c = table.tometadata(meta2)
table2_c = table2.tometadata(meta2)
eq_(
str(table_c.join(table2_c).onclause),
str(table_c.c.myid == table2_c.c.myid),
)
eq_(
str(table_c.join(table2_c).onclause),
"myschema.mytable.myid = myschema.othertable.myid",
)
def test_change_name_retain_metadata(self):
meta = MetaData()
table = Table(
"mytable",
meta,
Column("myid", Integer, primary_key=True),
Column("name", String(40), nullable=True),
Column(
"description", String(30), CheckConstraint("description='hi'")
),
UniqueConstraint("name"),
schema="myschema",
)
table2 = table.tometadata(table.metadata, name="newtable")
table3 = table.tometadata(
table.metadata, schema="newschema", name="newtable"
)