Source

sqlalchemy / test / orm / test_versioning.py

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
import datetime
import sqlalchemy as sa
from sqlalchemy.testing import engines
from sqlalchemy import testing
from sqlalchemy import Integer, String, Date, ForeignKey, literal_column, \
    orm, exc, select, TypeDecorator
from sqlalchemy.testing.schema import Table, Column
from sqlalchemy.orm import mapper, relationship, Session, \
    create_session, column_property, sessionmaker,\
    exc as orm_exc
from sqlalchemy.testing import eq_, ne_, assert_raises, assert_raises_message
from sqlalchemy.testing import fixtures
from test.orm import _fixtures
from sqlalchemy.testing.assertsql import AllOf, CompiledSQL


_uuids = [
    '1fc614acbb904742a2990f86af6ded95',
    '23e253786f4d491b9f9d6189dc33de9b',
    'fc44910db37e43fd93e9ec8165b885cf',
    '0187a1832b4249e6b48911821d86de58',
    '778af6ea2fb74a009d8d2f5abe5dc29a',
    '51a6ce031aff47e4b5f2895c4161f120',
    '7434097cd319401fb9f15fa443ccbbbb',
    '9bc548a8128e4a85ac18060bc3f4b7d3',
    '59548715e3c440b7bcb96417d06f7930',
    'd7647c7004734de196885ca2bd73adf8',
    '70cef121d3ff48d39906b6d1ac77f41a',
    'ee37a8a6430c466aa322b8a215a0dd70',
    '782a5f04b4364a53a6fce762f48921c1',
    'bef510f2420f4476a7629013ead237f5',
    ]

def make_uuid():
    """generate uuids even on Python 2.4 which has no 'uuid'"""
    return _uuids.pop(0)

class VersioningTest(fixtures.MappedTest):

    @classmethod
    def define_tables(cls, metadata):
        Table('version_table', metadata,
              Column('id', Integer, primary_key=True,
                     test_needs_autoincrement=True),
              Column('version_id', Integer, nullable=False),
              Column('value', String(40), nullable=False))

    @classmethod
    def setup_classes(cls):
        class Foo(cls.Basic):
            pass

    def _fixture(self):
        Foo, version_table = self.classes.Foo, self.tables.version_table

        mapper(Foo, version_table,
                version_id_col=version_table.c.version_id)
        s1 = Session()
        return s1

    @engines.close_open_connections
    def test_notsane_warning(self):
        Foo = self.classes.Foo

        save = testing.db.dialect.supports_sane_rowcount
        testing.db.dialect.supports_sane_rowcount = False
        try:
            s1 = self._fixture()
            f1 = Foo(value='f1')
            f2 = Foo(value='f2')
            s1.add_all((f1, f2))
            s1.commit()

            f1.value='f1rev2'
            assert_raises(sa.exc.SAWarning, s1.commit)
        finally:
            testing.db.dialect.supports_sane_rowcount = save

    @testing.emits_warning_on('+zxjdbc', r'.*does not support (update|delete)d rowcount')
    def test_basic(self):
        Foo = self.classes.Foo

        s1 = self._fixture()
        f1 = Foo(value='f1')
        f2 = Foo(value='f2')
        s1.add_all((f1, f2))
        s1.commit()

        f1.value='f1rev2'
        s1.commit()

        s2 = create_session(autocommit=False)
        f1_s = s2.query(Foo).get(f1.id)
        f1_s.value='f1rev3'
        s2.commit()

        f1.value='f1rev3mine'

        # Only dialects with a sane rowcount can detect the
        # StaleDataError
        if testing.db.dialect.supports_sane_rowcount:
            assert_raises_message(sa.orm.exc.StaleDataError,
            r"UPDATE statement on table 'version_table' expected "
            r"to update 1 row\(s\); 0 were matched.",
            s1.commit),
            s1.rollback()
        else:
            s1.commit()

        # new in 0.5 !  dont need to close the session
        f1 = s1.query(Foo).get(f1.id)
        f2 = s1.query(Foo).get(f2.id)

        f1_s.value='f1rev4'
        s2.commit()

        s1.delete(f1)
        s1.delete(f2)

        if testing.db.dialect.supports_sane_rowcount:
            assert_raises_message(
                sa.orm.exc.StaleDataError,
                r"DELETE statement on table 'version_table' expected "
                r"to delete 2 row\(s\); 1 were matched.",
                s1.commit)
        else:
            s1.commit()

    @testing.emits_warning_on('+zxjdbc', r'.*does not support (update|delete)d rowcount')
    def test_bump_version(self):
        """test that version number can be bumped.

        Ensures that the UPDATE or DELETE is against the
        last committed version of version_id_col, not the modified
        state.

        """

        Foo = self.classes.Foo

        s1 = self._fixture()
        f1 = Foo(value='f1')
        s1.add(f1)
        s1.commit()
        eq_(f1.version_id, 1)
        f1.version_id = 2
        s1.commit()
        eq_(f1.version_id, 2)

        # skip an id, test that history
        # is honored
        f1.version_id = 4
        f1.value = "something new"
        s1.commit()
        eq_(f1.version_id, 4)

        f1.version_id = 5
        s1.delete(f1)
        s1.commit()
        eq_(s1.query(Foo).count(), 0)

    @testing.emits_warning(r'.*does not support updated rowcount')
    @engines.close_open_connections
    def test_versioncheck(self):
        """query.with_lockmode performs a 'version check' on an already loaded instance"""

        Foo = self.classes.Foo


        s1 = self._fixture()
        f1s1 = Foo(value='f1 value')
        s1.add(f1s1)
        s1.commit()

        s2 = create_session(autocommit=False)
        f1s2 = s2.query(Foo).get(f1s1.id)
        f1s2.value='f1 new value'
        s2.commit()

        # load, version is wrong
        assert_raises_message(
                sa.orm.exc.StaleDataError,
                r"Instance .* has version id '\d+' which does not "
                r"match database-loaded version id '\d+'",
                s1.query(Foo).with_lockmode('read').get, f1s1.id
            )

        # reload it - this expires the old version first
        s1.refresh(f1s1, lockmode='read')

        # now assert version OK
        s1.query(Foo).with_lockmode('read').get(f1s1.id)

        # assert brand new load is OK too
        s1.close()
        s1.query(Foo).with_lockmode('read').get(f1s1.id)


    @testing.emits_warning(r'.*does not support updated rowcount')
    @engines.close_open_connections
    @testing.requires.update_nowait
    def test_versioncheck_for_update(self):
        """query.with_lockmode performs a 'version check' on an already loaded instance"""

        Foo = self.classes.Foo


        s1 = self._fixture()
        f1s1 = Foo(value='f1 value')
        s1.add(f1s1)
        s1.commit()

        s2 = create_session(autocommit=False)
        f1s2 = s2.query(Foo).get(f1s1.id)
        s2.refresh(f1s2, lockmode='update')
        f1s2.value='f1 new value'

        assert_raises(
            exc.DBAPIError,
            s1.refresh, f1s1, lockmode='update_nowait'
        )
        s1.rollback()

        s2.commit()
        s1.refresh(f1s1, lockmode='update_nowait')
        assert f1s1.version_id == f1s2.version_id

    @testing.emits_warning(r'.*does not support updated rowcount')
    @engines.close_open_connections
    def test_noversioncheck(self):
        """test query.with_lockmode works when the mapper has no version id col"""

        Foo, version_table = self.classes.Foo, self.tables.version_table

        s1 = create_session(autocommit=False)
        mapper(Foo, version_table)
        f1s1 = Foo(value="foo", version_id=0)
        s1.add(f1s1)
        s1.commit()

        s2 = create_session(autocommit=False)
        f1s2 = s2.query(Foo).with_lockmode('read').get(f1s1.id)
        assert f1s2.id == f1s1.id
        assert f1s2.value == f1s1.value

    @testing.emits_warning_on('+zxjdbc', r'.*does not support updated rowcount')
    def test_merge_no_version(self):
        Foo = self.classes.Foo

        s1 = self._fixture()
        f1 = Foo(value='f1')
        s1.add(f1)
        s1.commit()

        f1.value = 'f2'
        s1.commit()

        f2 = Foo(id=f1.id, value='f3')
        f3 = s1.merge(f2)
        assert f3 is f1
        s1.commit()
        eq_(f3.version_id, 3)

    @testing.emits_warning_on('+zxjdbc', r'.*does not support updated rowcount')
    def test_merge_correct_version(self):
        Foo = self.classes.Foo

        s1 = self._fixture()
        f1 = Foo(value='f1')
        s1.add(f1)
        s1.commit()

        f1.value = 'f2'
        s1.commit()

        f2 = Foo(id=f1.id, value='f3', version_id=2)
        f3 = s1.merge(f2)
        assert f3 is f1
        s1.commit()
        eq_(f3.version_id, 3)

    @testing.emits_warning_on('+zxjdbc', r'.*does not support updated rowcount')
    def test_merge_incorrect_version(self):
        Foo = self.classes.Foo

        s1 = self._fixture()
        f1 = Foo(value='f1')
        s1.add(f1)
        s1.commit()

        f1.value = 'f2'
        s1.commit()

        f2 = Foo(id=f1.id, value='f3', version_id=1)
        assert_raises_message(
            orm_exc.StaleDataError,
            "Version id '1' on merged state "
            "<Foo at .*?> does not match existing version '2'. "
            "Leave the version attribute unset when "
            "merging to update the most recent version.",
            s1.merge, f2
        )

    @testing.emits_warning_on('+zxjdbc', r'.*does not support updated rowcount')
    def test_merge_incorrect_version_not_in_session(self):
        Foo = self.classes.Foo

        s1 = self._fixture()
        f1 = Foo(value='f1')
        s1.add(f1)
        s1.commit()

        f1.value = 'f2'
        s1.commit()

        f2 = Foo(id=f1.id, value='f3', version_id=1)
        s1.close()

        assert_raises_message(
            orm_exc.StaleDataError,
            "Version id '1' on merged state "
            "<Foo at .*?> does not match existing version '2'. "
            "Leave the version attribute unset when "
            "merging to update the most recent version.",
            s1.merge, f2
        )

class ColumnTypeTest(fixtures.MappedTest):

    @classmethod
    def define_tables(cls, metadata):
        class SpecialType(TypeDecorator):
            impl = Date
            def process_bind_param(self, value, dialect):
                assert isinstance(value, datetime.date)
                return value

        Table('version_table', metadata,
              Column('id', SpecialType, primary_key=True),
              Column('version_id', Integer, nullable=False),
              Column('value', String(40), nullable=False))

    @classmethod
    def setup_classes(cls):
        class Foo(cls.Basic):
            pass

    def _fixture(self):
        Foo, version_table = self.classes.Foo, self.tables.version_table

        mapper(Foo, version_table,
                version_id_col=version_table.c.version_id)
        s1 = Session()
        return s1

    @engines.close_open_connections
    def test_update(self):
        Foo = self.classes.Foo

        s1 = self._fixture()
        f1 = Foo(id=datetime.date.today(), value='f1')
        s1.add(f1)
        s1.commit()

        f1.value='f1rev2'
        s1.commit()

class RowSwitchTest(fixtures.MappedTest):
    @classmethod
    def define_tables(cls, metadata):
        Table('p', metadata,
            Column('id', String(10), primary_key=True),
            Column('version_id', Integer, default=1, nullable=False),
            Column('data', String(50))
        )
        Table('c', metadata,
            Column('id', String(10), ForeignKey('p.id'), primary_key=True),
            Column('version_id', Integer, default=1, nullable=False),
            Column('data', String(50))
        )

    @classmethod
    def setup_classes(cls):
        class P(cls.Basic):
            pass
        class C(cls.Basic):
            pass

    @classmethod
    def setup_mappers(cls):
        p, c, C, P = (cls.tables.p,
                                cls.tables.c,
                                cls.classes.C,
                                cls.classes.P)

        mapper(P, p, version_id_col=p.c.version_id,
            properties={
            'c':relationship(C, uselist=False, cascade='all, delete-orphan')
        })
        mapper(C, c, version_id_col=c.c.version_id)

    @testing.emits_warning_on('+zxjdbc', r'.*does not support updated rowcount')
    def test_row_switch(self):
        P = self.classes.P

        session = sessionmaker()()
        session.add(P(id='P1', data='P version 1'))
        session.commit()
        session.close()

        p = session.query(P).first()
        session.delete(p)
        session.add(P(id='P1', data="really a row-switch"))
        session.commit()

    @testing.emits_warning_on('+zxjdbc', r'.*does not support updated rowcount')
    def test_child_row_switch(self):
        P, C = self.classes.P, self.classes.C

        assert P.c.property.strategy.use_get

        session = sessionmaker()()
        session.add(P(id='P1', data='P version 1'))
        session.commit()
        session.close()

        p = session.query(P).first()
        p.c = C(data='child version 1')
        session.commit()

        p = session.query(P).first()
        p.c = C(data='child row-switch')
        session.commit()

class AlternateGeneratorTest(fixtures.MappedTest):
    @classmethod
    def define_tables(cls, metadata):
        Table('p', metadata,
            Column('id', String(10), primary_key=True),
            Column('version_id', String(32), nullable=False),
            Column('data', String(50))
        )
        Table('c', metadata,
            Column('id', String(10), ForeignKey('p.id'), primary_key=True),
            Column('version_id', String(32), nullable=False),
            Column('data', String(50))
        )

    @classmethod
    def setup_classes(cls):
        class P(cls.Basic):
            pass
        class C(cls.Basic):
            pass

    @classmethod
    def setup_mappers(cls):
        p, c, C, P = (cls.tables.p,
                                cls.tables.c,
                                cls.classes.C,
                                cls.classes.P)

        mapper(P, p, version_id_col=p.c.version_id,
            version_id_generator=lambda x: make_uuid(),
            properties={
            'c': relationship(C, uselist=False, cascade='all, delete-orphan')
        })
        mapper(C, c, version_id_col=c.c.version_id,
                    version_id_generator=lambda x: make_uuid(),
        )

    @testing.emits_warning_on('+zxjdbc', r'.*does not support updated rowcount')
    def test_row_switch(self):
        P = self.classes.P

        session = sessionmaker()()
        session.add(P(id='P1', data='P version 1'))
        session.commit()
        session.close()

        p = session.query(P).first()
        session.delete(p)
        session.add(P(id='P1', data="really a row-switch"))
        session.commit()

    @testing.emits_warning_on('+zxjdbc', r'.*does not support (update|delete)d rowcount')
    def test_child_row_switch_one(self):
        P, C = self.classes.P, self.classes.C

        assert P.c.property.strategy.use_get

        session = sessionmaker()()
        session.add(P(id='P1', data='P version 1'))
        session.commit()
        session.close()

        p = session.query(P).first()
        p.c = C(data='child version 1')
        session.commit()

        p = session.query(P).first()
        p.c = C(data='child row-switch')
        session.commit()

    @testing.emits_warning_on('+zxjdbc', r'.*does not support (update|delete)d rowcount')
    def test_child_row_switch_two(self):
        P = self.classes.P

        Session = sessionmaker()

        # TODO: not sure this test is
        # testing exactly what its looking for

        sess1 = Session()
        sess1.add(P(id='P1', data='P version 1'))
        sess1.commit()
        sess1.close()

        p1 = sess1.query(P).first()

        sess2 = Session()
        p2 = sess2.query(P).first()

        sess1.delete(p1)
        sess1.commit()

        # this can be removed and it still passes
        sess1.add(P(id='P1', data='P version 2'))
        sess1.commit()

        p2.data = 'P overwritten by concurrent tx'
        if testing.db.dialect.supports_sane_rowcount:
            assert_raises_message(
                orm.exc.StaleDataError,
                r"UPDATE statement on table 'p' expected to update "
                r"1 row\(s\); 0 were matched.",
                sess2.commit
            )
        else:
            sess2.commit

class InheritanceTwoVersionIdsTest(fixtures.MappedTest):
    """Test versioning where both parent/child table have a
    versioning column.

    """
    @classmethod
    def define_tables(cls, metadata):
        Table('base', metadata,
            Column('id', Integer, primary_key=True, test_needs_autoincrement=True),
            Column('version_id', Integer, nullable=True),
            Column('data', String(50))
        )
        Table('sub', metadata,
            Column('id', Integer, ForeignKey('base.id'), primary_key=True),
            Column('version_id', Integer, nullable=False),
            Column('sub_data', String(50))
        )

    @classmethod
    def setup_classes(cls):
        class Base(cls.Basic):
            pass
        class Sub(Base):
            pass

    def test_base_both(self):
        Base, sub, base, Sub = (self.classes.Base,
                                self.tables.sub,
                                self.tables.base,
                                self.classes.Sub)

        mapper(Base, base,
                version_id_col=base.c.version_id)
        mapper(Sub, sub, inherits=Base)

        session = Session()
        b1 = Base(data='b1')
        session.add(b1)
        session.commit()
        eq_(b1.version_id, 1)
        # base is populated
        eq_(select([base.c.version_id]).scalar(), 1)

    def test_sub_both(self):
        Base, sub, base, Sub = (self.classes.Base,
                                self.tables.sub,
                                self.tables.base,
                                self.classes.Sub)

        mapper(Base, base,
                version_id_col=base.c.version_id)
        mapper(Sub, sub, inherits=Base)

        session = Session()
        s1 = Sub(data='s1', sub_data='s1')
        session.add(s1)
        session.commit()

        # table is populated
        eq_(select([sub.c.version_id]).scalar(), 1)

        # base is populated
        eq_(select([base.c.version_id]).scalar(), 1)

    def test_sub_only(self):
        Base, sub, base, Sub = (self.classes.Base,
                                self.tables.sub,
                                self.tables.base,
                                self.classes.Sub)

        mapper(Base, base)
        mapper(Sub, sub, inherits=Base,
                version_id_col=sub.c.version_id)

        session = Session()
        s1 = Sub(data='s1', sub_data='s1')
        session.add(s1)
        session.commit()

        # table is populated
        eq_(select([sub.c.version_id]).scalar(), 1)

        # base is not
        eq_(select([base.c.version_id]).scalar(), None)

    def test_mismatch_version_col_warning(self):
        Base, sub, base, Sub = (self.classes.Base,
                                self.tables.sub,
                                self.tables.base,
                                self.classes.Sub)

        mapper(Base, base,
                version_id_col=base.c.version_id)

        assert_raises_message(
            exc.SAWarning,
            "Inheriting version_id_col 'version_id' does not "
            "match inherited version_id_col 'version_id' and will not "
            "automatically populate the inherited versioning column. "
            "version_id_col should only be specified on "
            "the base-most mapper that includes versioning.",
            mapper,
            Sub, sub, inherits=Base,
                version_id_col=sub.c.version_id)


class ServerVersioningTest(fixtures.MappedTest):
    run_define_tables = 'each'

    @classmethod
    def define_tables(cls, metadata):
        from sqlalchemy.sql import ColumnElement
        from sqlalchemy.ext.compiler import compiles
        import itertools

        counter = itertools.count(1)

        class IncDefault(ColumnElement):
            pass

        @compiles(IncDefault)
        def compile(element, compiler, **kw):
            # cache the counter value on the statement
            # itself so the assertsql system gets the same
            # value when it compiles the statement a second time
            stmt = compiler.statement
            if hasattr(stmt, "_counter"):
                return stmt._counter
            else:
                stmt._counter = str(next(counter))
                return stmt._counter

        Table('version_table', metadata,
              Column('id', Integer, primary_key=True,
                     test_needs_autoincrement=True),
              Column('version_id', Integer, nullable=False,
                            default=IncDefault(), onupdate=IncDefault()),
              Column('value', String(40), nullable=False))

    @classmethod
    def setup_classes(cls):
        class Foo(cls.Basic):
            pass
        class Bar(cls.Basic):
            pass

    def _fixture(self, expire_on_commit=True):
        Foo, version_table = self.classes.Foo, self.tables.version_table

        mapper(Foo, version_table,
                version_id_col=version_table.c.version_id,
                version_id_generator=False,
            )

        s1 = Session(expire_on_commit=expire_on_commit)
        return s1

    def test_insert_col(self):
        sess = self._fixture()

        f1 = self.classes.Foo(value='f1')
        sess.add(f1)

        statements = [
                # note that the assertsql tests the rule against
                # "default" - on a "returning" backend, the statement
                # includes "RETURNING"
                CompiledSQL(
                    "INSERT INTO version_table (version_id, value) "
                    "VALUES (1, :value)",
                    lambda ctx: [{'value': 'f1'}]
                )
        ]
        if not testing.db.dialect.implicit_returning:
            # DBs without implicit returning, we must immediately
            # SELECT for the new version id
            statements.append(
                CompiledSQL(
                    "SELECT version_table.version_id AS version_table_version_id "
                    "FROM version_table WHERE version_table.id = :param_1",
                    lambda ctx: [{"param_1": 1}]
                )
            )
        self.assert_sql_execution(testing.db, sess.flush, *statements)

    def test_update_col(self):
        sess = self._fixture()

        f1 = self.classes.Foo(value='f1')
        sess.add(f1)
        sess.flush()

        f1.value = 'f2'

        statements = [
                # note that the assertsql tests the rule against
                # "default" - on a "returning" backend, the statement
                # includes "RETURNING"
                CompiledSQL(
                    "UPDATE version_table SET version_id=2, value=:value "
                    "WHERE version_table.id = :version_table_id AND "
                    "version_table.version_id = :version_table_version_id",
                    lambda ctx: [{"version_table_id": 1,
                            "version_table_version_id": 1, "value": "f2"}]
                )
        ]
        if not testing.db.dialect.implicit_returning:
            # DBs without implicit returning, we must immediately
            # SELECT for the new version id
            statements.append(
                CompiledSQL(
                    "SELECT version_table.version_id AS version_table_version_id "
                    "FROM version_table WHERE version_table.id = :param_1",
                    lambda ctx: [{"param_1": 1}]
                )
            )
        self.assert_sql_execution(testing.db, sess.flush, *statements)


    def test_delete_col(self):
        sess = self._fixture()

        f1 = self.classes.Foo(value='f1')
        sess.add(f1)
        sess.flush()

        sess.delete(f1)

        statements = [
                # note that the assertsql tests the rule against
                # "default" - on a "returning" backend, the statement
                # includes "RETURNING"
                CompiledSQL(
                    "DELETE FROM version_table "
                    "WHERE version_table.id = :id AND "
                    "version_table.version_id = :version_id",
                    lambda ctx: [{"id": 1, "version_id": 1}]
                )
        ]
        self.assert_sql_execution(testing.db, sess.flush, *statements)

    def test_concurrent_mod_err_expire_on_commit(self):
        sess = self._fixture()

        f1 = self.classes.Foo(value='f1')
        sess.add(f1)
        sess.commit()

        f1.value

        s2 = Session()
        f2 = s2.query(self.classes.Foo).first()
        f2.value = 'f2'
        s2.commit()

        f1.value = 'f3'

        assert_raises_message(
            orm.exc.StaleDataError,
            r"UPDATE statement on table 'version_table' expected to "
            r"update 1 row\(s\); 0 were matched.",
            sess.commit
        )

    def test_concurrent_mod_err_noexpire_on_commit(self):
        sess = self._fixture(expire_on_commit=False)

        f1 = self.classes.Foo(value='f1')
        sess.add(f1)
        sess.commit()

        # here, we're not expired overall, so no load occurs and we
        # stay without a version id, unless we've emitted
        # a SELECT for it within the flush.
        f1.value

        s2 = Session(expire_on_commit=False)
        f2 = s2.query(self.classes.Foo).first()
        f2.value = 'f2'
        s2.commit()

        f1.value = 'f3'

        assert_raises_message(
            orm.exc.StaleDataError,
            r"UPDATE statement on table 'version_table' expected to "
            r"update 1 row\(s\); 0 were matched.",
            sess.commit
        )

class ManualVersionTest(fixtures.MappedTest):
    run_define_tables = 'each'

    @classmethod
    def define_tables(cls, metadata):
        Table("a", metadata,
                Column('id', Integer, primary_key=True, test_needs_autoincrement=True),
                Column('data', String(30)),
                Column('vid', Integer)
            )

    @classmethod
    def setup_classes(cls):
        class A(cls.Basic):
            pass


    @classmethod
    def setup_mappers(cls):
        mapper(cls.classes.A, cls.tables.a,
                        version_id_col=cls.tables.a.c.vid,
                        version_id_generator=False)

    def test_insert(self):
        sess = Session()
        a1 = self.classes.A()

        a1.vid = 1
        sess.add(a1)
        sess.commit()

        eq_(a1.vid, 1)

    def test_update(self):
        sess = Session()
        a1 = self.classes.A()

        a1.vid = 1
        a1.data = 'd1'
        sess.add(a1)
        sess.commit()

        a1.vid = 2
        a1.data = 'd2'

        sess.commit()

        eq_(a1.vid, 2)

    def test_update_concurrent_check(self):
        sess = Session()
        a1 = self.classes.A()

        a1.vid = 1
        a1.data = 'd1'
        sess.add(a1)
        sess.commit()

        a1.vid = 2
        sess.execute(self.tables.a.update().values(vid=3))
        a1.data = 'd2'
        assert_raises(
            orm_exc.StaleDataError,
            sess.commit
        )

    def test_update_version_conditional(self):
        sess = Session()
        a1 = self.classes.A()

        a1.vid = 1
        a1.data = 'd1'
        sess.add(a1)
        sess.commit()

        # change the data and UPDATE without
        # incrementing version id
        a1.data = 'd2'
        sess.commit()

        eq_(a1.vid, 1)

        a1.data = 'd3'
        a1.vid = 2
        sess.commit()

        eq_(a1.vid, 2)
Tip: Filter by directory path e.g. /media app.js to search for public/media/app.js.
Tip: Use camelCasing e.g. ProjME to search for ProjectModifiedEvent.java.
Tip: Filter by extension type e.g. /repo .js to search for all .js files in the /repo directory.
Tip: Separate your search with spaces e.g. /ssh pom.xml to search for src/ssh/pom.xml.
Tip: Use ↑ and ↓ arrow keys to navigate and return to view the file.
Tip: You can also navigate files with Ctrl+j (next) and Ctrl+k (previous) and view the file with Ctrl+o.
Tip: You can also navigate files with Alt+j (next) and Alt+k (previous) and view the file with Alt+o.