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# -*- coding: utf-8 -*-
import os
from sqlalchemy import *
from migrate.versioning import schemadiff
from migrate.tests import fixture
class SchemaDiffBase(fixture.DB):
level = fixture.DB.CONNECT
def _make_table(self,*cols,**kw):
self.table = Table('xtable', self.meta,
Column('id',Integer(), primary_key=True),
*cols
)
if kw.get('create',True):
self.table.create()
def _assert_diff(self,col_A,col_B):
self._make_table(col_A)
self.meta.clear()
self._make_table(col_B,create=False)
diff = self._run_diff()
# print diff
self.assertTrue(diff)
self.assertEqual(1,len(diff.tables_different))
td = list(diff.tables_different.values())[0]
self.assertEqual(1,len(td.columns_different))
cd = list(td.columns_different.values())[0]
label_width = max(len(self.name1), len(self.name2))
self.assertEqual(('Schema diffs:\n'
' table with differences: xtable\n'
' column with differences: data\n'
' %*s: %r\n'
' %*s: %r')%(
label_width,
self.name1,
cd.col_A,
label_width,
self.name2,
cd.col_B
),str(diff))
class Test_getDiffOfModelAgainstDatabase(SchemaDiffBase):
name1 = 'model'
name2 = 'database'
def _run_diff(self,**kw):
return schemadiff.getDiffOfModelAgainstDatabase(
self.meta, self.engine, **kw
)
@fixture.usedb()
def test_table_missing_in_db(self):
self._make_table(create=False)
diff = self._run_diff()
self.assertTrue(diff)
self.assertEqual('Schema diffs:\n tables missing from %s: xtable' % self.name2,
str(diff))
@fixture.usedb()
def test_table_missing_in_model(self):
self._make_table()
self.meta.clear()
diff = self._run_diff()
self.assertTrue(diff)
self.assertEqual('Schema diffs:\n tables missing from %s: xtable' % self.name1,
str(diff))
@fixture.usedb()
def test_column_missing_in_db(self):
# db
Table('xtable', self.meta,
Column('id',Integer(), primary_key=True),
).create()
self.meta.clear()
# model
self._make_table(
Column('xcol',Integer()),
create=False
)
# run diff
diff = self._run_diff()
self.assertTrue(diff)
self.assertEqual('Schema diffs:\n'
' table with differences: xtable\n'
' %s missing these columns: xcol' % self.name2,
str(diff))
@fixture.usedb()
def test_column_missing_in_model(self):
# db
self._make_table(
Column('xcol',Integer()),
)
self.meta.clear()
# model
self._make_table(
create=False
)
# run diff
diff = self._run_diff()
self.assertTrue(diff)
self.assertEqual('Schema diffs:\n'
' table with differences: xtable\n'
' %s missing these columns: xcol' % self.name1,
str(diff))
@fixture.usedb()
def test_exclude_tables(self):
# db
Table('ytable', self.meta,
Column('id',Integer(), primary_key=True),
).create()
Table('ztable', self.meta,
Column('id',Integer(), primary_key=True),
).create()
self.meta.clear()
# model
self._make_table(
create=False
)
Table('ztable', self.meta,
Column('id',Integer(), primary_key=True),
)
# run diff
diff = self._run_diff(excludeTables=('xtable','ytable'))
# ytable only in database
# xtable only in model
# ztable identical on both
# ...so we expect no diff!
self.assertFalse(diff)
self.assertEqual('No schema diffs',str(diff))
@fixture.usedb()
def test_identical_just_pk(self):
self._make_table()
diff = self._run_diff()
self.assertFalse(diff)
self.assertEqual('No schema diffs',str(diff))
@fixture.usedb()
def test_different_type(self):
self._assert_diff(
Column('data', String(10)),
Column('data', Integer()),
)
@fixture.usedb()
def test_int_vs_float(self):
self._assert_diff(
Column('data', Integer()),
Column('data', Float()),
)
# NOTE(mriedem): The ibm_db_sa driver handles the Float() as a DOUBLE()
# which extends Numeric() but isn't defined in sqlalchemy.types, so we
# can't check for it as a special case like is done in schemadiff.ColDiff.
@fixture.usedb(not_supported='ibm_db_sa')
def test_float_vs_numeric(self):
self._assert_diff(
Column('data', Float()),
Column('data', Numeric()),
)
@fixture.usedb()
def test_numeric_precision(self):
self._assert_diff(
Column('data', Numeric(precision=5)),
Column('data', Numeric(precision=6)),
)
@fixture.usedb()
def test_numeric_scale(self):
self._assert_diff(
Column('data', Numeric(precision=6,scale=0)),
Column('data', Numeric(precision=6,scale=1)),
)
@fixture.usedb()
def test_string_length(self):
self._assert_diff(
Column('data', String(10)),
Column('data', String(20)),
)
@fixture.usedb()
def test_integer_identical(self):
self._make_table(
Column('data', Integer()),
)
diff = self._run_diff()
self.assertEqual('No schema diffs',str(diff))
self.assertFalse(diff)
@fixture.usedb()
def test_string_identical(self):
self._make_table(
Column('data', String(10)),
)
diff = self._run_diff()
self.assertEqual('No schema diffs',str(diff))
self.assertFalse(diff)
@fixture.usedb()
def test_text_identical(self):
self._make_table(
Column('data', Text),
)
diff = self._run_diff()
self.assertEqual('No schema diffs',str(diff))
self.assertFalse(diff)
class Test_getDiffOfModelAgainstModel(Test_getDiffOfModelAgainstDatabase):
name1 = 'metadataA'
name2 = 'metadataB'
def _run_diff(self,**kw):
db_meta= MetaData()
db_meta.reflect(self.engine)
return schemadiff.getDiffOfModelAgainstModel(
self.meta, db_meta, **kw
)
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