Source

south / south / tests / db.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
import datetime

from south.db import db, generic
from django.db import connection, models, IntegrityError

from south.tests import unittest, skipIf, skipUnless

# Create a list of error classes from the various database libraries
errors = []
try:
    from psycopg2 import ProgrammingError
    errors.append(ProgrammingError)
except ImportError:
    pass
errors = tuple(errors)

try:
    from south.db import mysql
except ImportError:
    mysql = None


class TestOperations(unittest.TestCase):

    """
    Tests if the various DB abstraction calls work.
    Can only test a limited amount due to DB differences.
    """

    def setUp(self):
        db.debug = False
        db.clear_deferred_sql()
        db.start_transaction()
    
    def tearDown(self):
        db.rollback_transaction()

    def test_create(self):
        """
        Test creation of tables.
        """
        cursor = connection.cursor()
        # It needs to take at least 2 args
        self.assertRaises(TypeError, db.create_table)
        self.assertRaises(TypeError, db.create_table, "test1")
        # Empty tables (i.e. no columns) are not fine, so make at least 1
        db.create_table("test1", [('email_confirmed', models.BooleanField(default=False))])
        # And should exist
        cursor.execute("SELECT * FROM test1")
        # Make sure we can't do the same query on an empty table
        try:
            cursor.execute("SELECT * FROM nottheretest1")
        except:
            pass
        else:
            self.fail("Non-existent table could be selected!")
    
    def test_delete(self):
        """
        Test deletion of tables.
        """
        cursor = connection.cursor()
        db.create_table("test_deltable", [('email_confirmed', models.BooleanField(default=False))])
        db.delete_table("test_deltable")
        # Make sure it went
        try:
            cursor.execute("SELECT * FROM test_deltable")
        except:
            pass
        else:
            self.fail("Just-deleted table could be selected!")
    
    def test_nonexistent_delete(self):
        """
        Test deletion of nonexistent tables.
        """
        try:
            db.delete_table("test_nonexistdeltable")
        except:
            pass
        else:
            self.fail("Non-existent table could be deleted!")
    
    def test_foreign_keys(self):
        """
        Tests foreign key creation, especially uppercase (see #61)
        """
        Test = db.mock_model(model_name='Test', db_table='test5a',
                             db_tablespace='', pk_field_name='ID',
                             pk_field_type=models.AutoField, pk_field_args=[])
        db.create_table("test5a", [('ID', models.AutoField(verbose_name='ID', primary_key=True, auto_created=True))])
        db.create_table("test5b", [
            ('id', models.AutoField(verbose_name='ID', primary_key=True, auto_created=True)),
            ('UNIQUE', models.ForeignKey(Test)),
        ])
        db.execute_deferred_sql()
        
    @skipUnless(db.supports_foreign_keys, 'Foreign keys can only be deleted on '
                                          'engines that support them.')
    def test_recursive_foreign_key_delete(self):
        """
        Test that recursive foreign keys are deleted correctly (see #1065)
        """
        Test = db.mock_model(model_name='Test', db_table='test_rec_fk_del',
                             db_tablespace='', pk_field_name='id',
                             pk_field_type=models.AutoField, pk_field_args=[])
        db.create_table('test_rec_fk_del', [
            ('id', models.AutoField(primary_key=True, auto_created=True)),
            ('fk', models.ForeignKey(Test)),
        ])
        db.execute_deferred_sql()
        db.delete_foreign_key('test_rec_fk_del', 'fk_id')
    
    def test_rename(self):
        """
        Test column renaming
        """
        cursor = connection.cursor()
        db.create_table("test_rn", [('spam', models.BooleanField(default=False))])
        # Make sure we can select the column
        cursor.execute("SELECT spam FROM test_rn")
        # Rename it
        db.rename_column("test_rn", "spam", "eggs")
        cursor.execute("SELECT eggs FROM test_rn")
        db.commit_transaction()
        db.start_transaction()
        try:
            cursor.execute("SELECT spam FROM test_rn")
        except:
            pass
        else:
            self.fail("Just-renamed column could be selected!")
        db.rollback_transaction()
        db.delete_table("test_rn")
        db.start_transaction()
    
    def test_dry_rename(self):
        """
        Test column renaming while --dry-run is turned on (should do nothing)
        See ticket #65
        """
        cursor = connection.cursor()
        db.create_table("test_drn", [('spam', models.BooleanField(default=False))])
        # Make sure we can select the column
        cursor.execute("SELECT spam FROM test_drn")
        # Rename it
        db.dry_run = True
        db.rename_column("test_drn", "spam", "eggs")
        db.dry_run = False
        cursor.execute("SELECT spam FROM test_drn")
        db.commit_transaction()
        db.start_transaction()
        try:
            cursor.execute("SELECT eggs FROM test_drn")
        except:
            pass
        else:
            self.fail("Dry-renamed new column could be selected!")
        db.rollback_transaction()
        db.delete_table("test_drn")
        db.start_transaction()
    
    def test_table_rename(self):
        """
        Test column renaming
        """
        cursor = connection.cursor()
        db.create_table("testtr", [('spam', models.BooleanField(default=False))])
        # Make sure we can select the column
        cursor.execute("SELECT spam FROM testtr")
        # Rename it
        db.rename_table("testtr", "testtr2")
        cursor.execute("SELECT spam FROM testtr2")
        db.commit_transaction()
        db.start_transaction()
        try:
            cursor.execute("SELECT spam FROM testtr")
        except:
            pass
        else:
            self.fail("Just-renamed column could be selected!")
        db.rollback_transaction()
        db.delete_table("testtr2")
        db.start_transaction()
    
    def test_percents_in_defaults(self):
        """
        Test that % in a default gets escaped to %%.
        """
        try:
            db.create_table("testpind", [('cf', models.CharField(max_length=255, default="It should be 2%!"))])
        except IndexError:
            self.fail("% was not properly escaped in column SQL.")
        db.delete_table("testpind")
    
    def test_index(self):
        """
        Test the index operations
        """
        db.create_table("test3", [
            ('SELECT', models.BooleanField(default=False)),
            ('eggs', models.IntegerField(unique=True)),
        ])
        db.execute_deferred_sql()
        # Add an index on that column
        db.create_index("test3", ["SELECT"])
        # Add another index on two columns
        db.create_index("test3", ["SELECT", "eggs"])
        # Delete them both
        db.delete_index("test3", ["SELECT"])
        db.delete_index("test3", ["SELECT", "eggs"])
        # Delete the unique index/constraint
        if db.backend_name != "sqlite3":
            db.delete_unique("test3", ["eggs"])
        db.delete_table("test3")
    
    def test_primary_key(self):
        """
        Test the primary key operations
        """
        
        db.create_table("test_pk", [
            ('id', models.IntegerField(primary_key=True)),
            ('new_pkey', models.IntegerField()),
            ('eggs', models.IntegerField(unique=True)),
        ])
        db.execute_deferred_sql()
        # Remove the default primary key, and make eggs it
        db.delete_primary_key("test_pk")
        db.create_primary_key("test_pk", "new_pkey")
        # Try inserting a now-valid row pair
        db.execute("INSERT INTO test_pk (id, new_pkey, eggs) VALUES (1, 2, 3)")
        db.execute("INSERT INTO test_pk (id, new_pkey, eggs) VALUES (1, 3, 4)")
        db.delete_table("test_pk")
    
    def test_primary_key_implicit(self):
        """
        Tests that changing primary key implicitly fails.
        """
        db.create_table("test_pki", [
            ('id', models.IntegerField(primary_key=True)),
            ('new_pkey', models.IntegerField()),
            ('eggs', models.IntegerField(unique=True)),
        ])
        db.execute_deferred_sql()
        # Fiddle with alter_column to attempt to make it remove the primary key
        db.alter_column("test_pki", "id", models.IntegerField())
        db.alter_column("test_pki", "new_pkey", models.IntegerField(primary_key=True))
        # Try inserting a should-be-valid row pair
        db.execute("INSERT INTO test_pki (id, new_pkey, eggs) VALUES (1, 2, 3)")
        db.execute("INSERT INTO test_pki (id, new_pkey, eggs) VALUES (2, 2, 4)")
        db.delete_table("test_pki")
    
    def test_add_columns(self):
        """
        Test adding columns
        """
        db.create_table("test_addc", [
            ('spam', models.BooleanField(default=False)),
            ('eggs', models.IntegerField()),
        ])
        # Add a column
        db.add_column("test_addc", "add1", models.IntegerField(default=3), keep_default=False)
        # Add a FK with keep_default=False (#69)
        User = db.mock_model(model_name='User', db_table='auth_user', db_tablespace='', pk_field_name='id', pk_field_type=models.AutoField, pk_field_args=[], pk_field_kwargs={})
        # insert some data so we can test the default value of the added fkey
        db.execute("INSERT INTO test_addc (spam, eggs, add1) VALUES (%s, 1, 2)", [False])
        db.add_column("test_addc", "user", models.ForeignKey(User, null=True), keep_default=False)
        db.execute_deferred_sql()
        # try selecting from the user_id column to make sure it was actually created
        val = db.execute("SELECT user_id FROM test_addc")[0][0]
        self.assertEquals(val, None)
        db.delete_column("test_addc", "add1")
        db.delete_table("test_addc")

    def test_add_nullbool_column(self):
        """
        Test adding NullBoolean columns
        """
        db.create_table("test_addnbc", [
            ('spam', models.BooleanField(default=False)),
            ('eggs', models.IntegerField()),
        ])
        # Add a column
        db.add_column("test_addnbc", "add1", models.NullBooleanField())
        # Add a column with a default
        db.add_column("test_addnbc", "add2", models.NullBooleanField(default=True))
        # insert some data so we can test the default values of the added column
        db.execute("INSERT INTO test_addnbc (spam, eggs) VALUES (%s, 1)", [False])
        # try selecting from the new columns to make sure they were properly created
        false, null, true = db.execute("SELECT spam,add1,add2 FROM test_addnbc")[0][0:3]
        self.assertTrue(true)
        self.assertEquals(null, None)
        self.assertEquals(false, False)
        db.delete_table("test_addnbc")
    
    def test_alter_columns(self):
        """
        Test altering columns
        """
        db.create_table("test_alterc", [
            ('spam', models.BooleanField(default=False)),
            ('eggs', models.IntegerField()),
        ])
        db.execute_deferred_sql()
        # Change eggs to be a FloatField
        db.alter_column("test_alterc", "eggs", models.FloatField())
        db.execute_deferred_sql()
        db.delete_table("test_alterc")
        db.execute_deferred_sql()
    
    def test_alter_char_default(self):
        """
        Test altering column defaults with char fields
        """
        db.create_table("test_altercd", [
            ('spam', models.CharField(max_length=30)),
            ('eggs', models.IntegerField()),
        ])
        # Change spam default
        db.alter_column("test_altercd", "spam", models.CharField(max_length=30, default="loof"))
        
    def test_mysql_defaults(self):
        """
        Test MySQL default handling for BLOB and TEXT.
        """
        db.create_table("test_altermyd", [
            ('spam', models.BooleanField(default=False)),
            ('eggs', models.TextField()),
        ])
        # Change eggs to be a FloatField
        db.alter_column("test_altermyd", "eggs", models.TextField(null=True))
        db.delete_table("test_altermyd")
    
    def test_alter_column_postgres_multiword(self):
        """
        Tests altering columns with multiple words in Postgres types (issue #125)
        e.g. 'datetime with time zone', look at django/db/backends/postgresql/creation.py
        """
        db.create_table("test_multiword", [
            ('col_datetime', models.DateTimeField(null=True)),
            ('col_integer', models.PositiveIntegerField(null=True)),
            ('col_smallint', models.PositiveSmallIntegerField(null=True)),
            ('col_float', models.FloatField(null=True)),
        ])
        
        # test if 'double precision' is preserved
        db.alter_column('test_multiword', 'col_float', models.FloatField('float', null=True))

        # test if 'CHECK ("%(column)s" >= 0)' is stripped
        db.alter_column('test_multiword', 'col_integer', models.PositiveIntegerField(null=True))
        db.alter_column('test_multiword', 'col_smallint', models.PositiveSmallIntegerField(null=True))

        # test if 'with timezone' is preserved
        if db.backend_name == "postgres":
            db.execute("INSERT INTO test_multiword (col_datetime) VALUES ('2009-04-24 14:20:55+02')")
            db.alter_column('test_multiword', 'col_datetime', models.DateTimeField(auto_now=True))
            assert db.execute("SELECT col_datetime = '2009-04-24 14:20:55+02' FROM test_multiword")[0][0]

        db.delete_table("test_multiword")
    
    @skipUnless(db.has_check_constraints, 'Only applies to databases that '
                                          'support CHECK constraints.')
    def test_alter_constraints(self):
        """
        Tests that going from a PostiveIntegerField to an IntegerField drops
        the constraint on the database.
        """
        # Make the test table
        db.create_table("test_alterc", [
            ('num', models.PositiveIntegerField()),
        ])
        db.execute_deferred_sql()
        # Add in some test values
        db.execute("INSERT INTO test_alterc (num) VALUES (1)")
        db.execute("INSERT INTO test_alterc (num) VALUES (2)")
        # Ensure that adding a negative number is bad
        db.commit_transaction()
        db.start_transaction()
        try:
            db.execute("INSERT INTO test_alterc (num) VALUES (-3)")
        except:
            db.rollback_transaction()
        else:
            self.fail("Could insert a negative integer into a PositiveIntegerField.")
        # Alter it to a normal IntegerField
        db.alter_column("test_alterc", "num", models.IntegerField())
        db.execute_deferred_sql()
        # It should now work
        db.execute("INSERT INTO test_alterc (num) VALUES (-3)")
        db.delete_table("test_alterc")
        # We need to match up for tearDown
        db.start_transaction()
    
    @skipIf(db.backend_name == "sqlite3", "SQLite backend doesn't support this "
                                          "yet.")
    def test_unique(self):
        """
        Tests creating/deleting unique constraints.
        """
        db.create_table("test_unique2", [
            ('id', models.AutoField(primary_key=True)),
        ])
        db.create_table("test_unique", [
            ('spam', models.BooleanField(default=False)),
            ('eggs', models.IntegerField()),
            ('ham', models.ForeignKey(db.mock_model('Unique2', 'test_unique2'))),
        ])
        db.execute_deferred_sql()
        # Add a constraint
        db.create_unique("test_unique", ["spam"])
        db.execute_deferred_sql()
        # Shouldn't do anything during dry-run
        db.dry_run = True
        db.delete_unique("test_unique", ["spam"])
        db.dry_run = False
        db.delete_unique("test_unique", ["spam"])
        db.create_unique("test_unique", ["spam"])
        # Special preparations for Sql Server
        if db.backend_name == "pyodbc":
            db.execute("SET IDENTITY_INSERT test_unique2 ON;")
        db.execute("INSERT INTO test_unique2 (id) VALUES (1)")
        db.execute("INSERT INTO test_unique2 (id) VALUES (2)")
        db.commit_transaction()
        db.start_transaction()

        
        # Test it works
        TRUE = (True,)
        FALSE = (False,)
        db.execute("INSERT INTO test_unique (spam, eggs, ham_id) VALUES (%s, 0, 1)", TRUE)
        db.execute("INSERT INTO test_unique (spam, eggs, ham_id) VALUES (%s, 1, 2)", FALSE)
        try:
            db.execute("INSERT INTO test_unique (spam, eggs, ham_id) VALUES (%s, 2, 1)", FALSE)
        except:
            db.rollback_transaction()
        else:
            self.fail("Could insert non-unique item.")
        
        # Drop that, add one only on eggs
        db.delete_unique("test_unique", ["spam"])
        db.execute("DELETE FROM test_unique")
        db.create_unique("test_unique", ["eggs"])
        db.start_transaction()
        
        # Test similarly
        db.execute("INSERT INTO test_unique (spam, eggs, ham_id) VALUES (%s, 0, 1)", TRUE)
        db.execute("INSERT INTO test_unique (spam, eggs, ham_id) VALUES (%s, 1, 2)", FALSE)
        try:
            db.execute("INSERT INTO test_unique (spam, eggs, ham_id) VALUES (%s, 1, 1)", TRUE)
        except:
            db.rollback_transaction()
        else:
            self.fail("Could insert non-unique item.")
        
        # Drop those, test combined constraints
        db.delete_unique("test_unique", ["eggs"])
        db.execute("DELETE FROM test_unique")
        db.create_unique("test_unique", ["spam", "eggs", "ham_id"])
        db.start_transaction()
        # Test similarly
        db.execute("INSERT INTO test_unique (spam, eggs, ham_id) VALUES (%s, 0, 1)", TRUE)
        db.execute("INSERT INTO test_unique (spam, eggs, ham_id) VALUES (%s, 1, 1)", FALSE)
        try:
            db.execute("INSERT INTO test_unique (spam, eggs, ham_id) VALUES (%s, 0, 1)", TRUE)
        except:
            db.rollback_transaction()
        else:
            self.fail("Could insert non-unique pair.")
        db.delete_unique("test_unique", ["spam", "eggs", "ham_id"])
        db.start_transaction()
    
    def test_alter_unique(self):
        """
        Tests that unique constraints are not affected when
        altering columns (that's handled by create_/delete_unique)
        """
        db.create_table("test_alter_unique", [
            ('spam', models.IntegerField()),
            ('eggs', models.IntegerField(unique=True)),
        ])
        db.execute_deferred_sql()
        
        # Make sure the unique constraint is created
        db.execute('INSERT INTO test_alter_unique (spam, eggs) VALUES (0, 42)')
        db.commit_transaction()
        db.start_transaction()
        try:
            db.execute("INSERT INTO test_alter_unique (spam, eggs) VALUES (1, 42)")
        except:
            pass
        else:
            self.fail("Could insert the same integer twice into a unique field.")
        db.rollback_transaction()

        # Alter without unique=True (should not affect anything)
        db.alter_column("test_alter_unique", "eggs", models.IntegerField())

        # Insertion should still fail
        db.start_transaction()
        try:
            db.execute("INSERT INTO test_alter_unique (spam, eggs) VALUES (1, 42)")
        except:
            pass
        else:
            self.fail("Could insert the same integer twice into a unique field after alter_column with unique=False.")
        db.rollback_transaction()
        
        # Delete the unique index/constraint
        if db.backend_name != "sqlite3":
            db.delete_unique("test_alter_unique", ["eggs"])
        db.delete_table("test_alter_unique")
        db.start_transaction()

    def test_capitalised_constraints(self):
        """
        Under PostgreSQL at least, capitalised constraints must be quoted.
        """
        db.create_table("test_capconst", [
            ('SOMECOL', models.PositiveIntegerField(primary_key=True)),
        ])
        # Alter it so it's not got the check constraint
        db.alter_column("test_capconst", "SOMECOL", models.IntegerField())
    
    def test_text_default(self):
        """
        MySQL cannot have blank defaults on TEXT columns.
        """
        db.create_table("test_textdef", [
            ('textcol', models.TextField(blank=True)),
        ])

    def test_text_to_char(self):
        """
        On Oracle, you can't simply ALTER TABLE MODIFY a textfield to a charfield
        """
        value = "kawabanga"
        db.create_table("test_text_to_char", [
            ('textcol', models.TextField()),
        ])
        db.execute_deferred_sql()
        db.execute("INSERT INTO test_text_to_char VALUES (%s)", [value])
        db.alter_column("test_text_to_char", "textcol", models.CharField(max_length=100))
        db.execute_deferred_sql()
        after = db.execute("select * from test_text_to_char")[0][0]
        self.assertEqual(value, after, "Change from text to char altered value [ %s != %s ]" % (`value`,`after`))

    def test_char_to_text(self):
        """
        On Oracle, you can't simply ALTER TABLE MODIFY a charfield to a textfield either
        """
        value = "agnabawak"
        db.create_table("test_char_to_text", [
            ('textcol', models.CharField(max_length=100)),
        ])
        db.execute_deferred_sql()
        db.execute("INSERT INTO test_char_to_text VALUES (%s)", [value])
        db.alter_column("test_char_to_text", "textcol", models.TextField())
        db.execute_deferred_sql()
        after = db.execute("select * from test_char_to_text")[0][0]
        after = unicode(after) # Oracle text fields return a sort of lazy string -- force evaluation
        self.assertEqual(value, after, "Change from char to text altered value [ %s != %s ]" % (`value`,`after`))

    def test_datetime_default(self):
        """
        Test that defaults are created correctly for datetime columns
        """
        end_of_world = datetime.datetime(2012, 12, 21, 0, 0, 1)

        try:
            from django.utils import timezone
        except ImportError:
            pass
        else:
            from django.conf import settings
            if getattr(settings, 'USE_TZ', False):
                end_of_world = end_of_world.replace(tzinfo=timezone.utc)

        db.create_table("test_datetime_def", [
            ('col0', models.IntegerField(null=True)),
            ('col1', models.DateTimeField(default=end_of_world)),
            ('col2', models.DateTimeField(null=True)),
        ])
        db.execute_deferred_sql()
        db.alter_column("test_datetime_def", "col2", models.DateTimeField(default=end_of_world))
        db.add_column("test_datetime_def", "col3", models.DateTimeField(default=end_of_world))
        db.execute_deferred_sql()
        # There should not be a default in the database for col1
        db.commit_transaction()
        db.start_transaction()
        self.assertRaises(
            IntegrityError,
            db.execute, "insert into test_datetime_def (col0) values (null)"
        )
        db.rollback_transaction()
        db.start_transaction()
        # There should be for the others
        db.execute("insert into test_datetime_def (col0, col1) values (null, %s)", [end_of_world])
        ends = db.execute("select col1,col2,col3 from test_datetime_def")[0]
        self.failUnlessEqual(len(ends), 3)
        for e in ends:
            self.failUnlessEqual(e, end_of_world)
        
    def test_add_unique_fk(self):
        """
        Test adding a ForeignKey with unique=True or a OneToOneField
        """
        db.create_table("test_add_unique_fk", [
            ('spam', models.BooleanField(default=False))
        ])
        
        db.add_column("test_add_unique_fk", "mock1", models.ForeignKey(db.mock_model('Mock', 'mock'), null=True, unique=True))
        db.add_column("test_add_unique_fk", "mock2", models.OneToOneField(db.mock_model('Mock', 'mock'), null=True))
        
        db.delete_table("test_add_unique_fk")
        
    @skipUnless(db.has_check_constraints, 'Only applies to databases that '
                                          'support CHECK constraints.')
    def test_column_constraint(self):
        """
        Tests that the value constraint of PositiveIntegerField is enforced on
        the database level.
        """
        db.create_table("test_column_constraint", [
            ('spam', models.PositiveIntegerField()),
        ])
        db.execute_deferred_sql()
        
        # Make sure we can't insert negative values
        db.commit_transaction()
        db.start_transaction()
        try:
            db.execute("INSERT INTO test_column_constraint VALUES (-42)")
        except:
            pass
        else:
            self.fail("Could insert a negative value into a PositiveIntegerField.")
        db.rollback_transaction()
        
        # remove constraint
        db.alter_column("test_column_constraint", "spam", models.IntegerField())
        db.execute_deferred_sql()
        # make sure the insertion works now
        db.execute('INSERT INTO test_column_constraint VALUES (-42)')
        db.execute('DELETE FROM test_column_constraint')
        
        # add it back again
        db.alter_column("test_column_constraint", "spam", models.PositiveIntegerField())
        db.execute_deferred_sql()
        # it should fail again
        db.start_transaction()
        try:
            db.execute("INSERT INTO test_column_constraint VALUES (-42)")
        except:
            pass
        else:
            self.fail("Could insert a negative value after changing an IntegerField to a PositiveIntegerField.")
        db.rollback_transaction()
        
        db.delete_table("test_column_constraint")
        db.start_transaction()

    def test_sql_defaults(self):
        """
        Test that sql default value is correct for non-string field types.
        Datetimes are handled in test_datetime_default.
        """

        class CustomField(models.CharField):
            __metaclass__ = models.SubfieldBase
            description = 'CustomField'
            def get_default(self):
                if self.has_default():
                    if callable(self.default):
                        return self.default()
                    return self.default
                return super(CustomField, self).get_default()
            def get_prep_value(self, value):
                if not value:
                    return value
                return ','.join(map(str, value))
            def to_python(self, value):
                if not value or isinstance(value, list):
                    return value
                return map(int, value.split(','))

        false_value = db.has_booleans and 'False' or '0'
        defaults = (
            (models.CharField(default='sukasuka'), 'DEFAULT \'sukasuka'),
            (models.BooleanField(default=False), 'DEFAULT %s' % false_value),
            (models.IntegerField(default=42), 'DEFAULT 42'),
            (CustomField(default=[2012, 2018, 2021, 2036]), 'DEFAULT \'2012,2018,2021,2036')
        )
        for field, sql_test_str in defaults:
            sql = db.column_sql('fish', 'YAAAAAAZ', field)
            if sql_test_str not in sql:
                self.fail("default sql value was not properly generated for field %r.\nSql was %s" % (field, sql))

    def test_make_added_foreign_key_not_null(self):
        # Table for FK to target
        User = db.mock_model(model_name='User', db_table='auth_user', db_tablespace='', pk_field_name='id', pk_field_type=models.AutoField, pk_field_args=[], pk_field_kwargs={})
        # Table with no foreign key
        db.create_table("test_fk", [
            ('eggs', models.IntegerField()),
        ])
        db.execute_deferred_sql()
        
        # Add foreign key
        db.add_column("test_fk", 'foreik', models.ForeignKey(User, null=True),
                      keep_default = False)
        db.execute_deferred_sql()
        
        # Make the FK null
        db.alter_column("test_fk", "foreik_id", models.ForeignKey(User))
        db.execute_deferred_sql()

class TestCacheGeneric(unittest.TestCase):
    base_ops_cls = generic.DatabaseOperations
    def setUp(self):
        class CacheOps(self.base_ops_cls):
            def __init__(self):
                self._constraint_cache = {}
                self.cache_filled = 0
                self.settings = {'NAME': 'db'}

            def _fill_constraint_cache(self, db, table):
                self.cache_filled += 1
                self._constraint_cache.setdefault(db, {})
                self._constraint_cache[db].setdefault(table, {})

            @generic.invalidate_table_constraints
            def clear_con(self, table):
                pass

            @generic.copy_column_constraints
            def cp_column(self, table, column_old, column_new):
                pass

            @generic.delete_column_constraints
            def rm_column(self, table, column):
                pass

            @generic.copy_column_constraints
            @generic.delete_column_constraints
            def mv_column(self, table, column_old, column_new):
                pass

            def _get_setting(self, attr):
                return self.settings[attr]
        self.CacheOps = CacheOps

    def test_cache(self):
        ops = self.CacheOps()
        self.assertEqual(0, ops.cache_filled)
        self.assertFalse(ops.lookup_constraint('db', 'table'))
        self.assertEqual(1, ops.cache_filled)
        self.assertFalse(ops.lookup_constraint('db', 'table'))
        self.assertEqual(1, ops.cache_filled)
        ops.clear_con('table')
        self.assertEqual(1, ops.cache_filled)
        self.assertFalse(ops.lookup_constraint('db', 'table'))
        self.assertEqual(2, ops.cache_filled)
        self.assertFalse(ops.lookup_constraint('db', 'table', 'column'))
        self.assertEqual(2, ops.cache_filled)

        cache = ops._constraint_cache
        cache['db']['table']['column'] = 'constraint'
        self.assertEqual('constraint', ops.lookup_constraint('db', 'table', 'column'))
        self.assertEqual([('column', 'constraint')], ops.lookup_constraint('db', 'table'))
        self.assertEqual(2, ops.cache_filled)

        # invalidate_table_constraints
        ops.clear_con('new_table')
        self.assertEqual('constraint', ops.lookup_constraint('db', 'table', 'column'))
        self.assertEqual(2, ops.cache_filled)

        self.assertFalse(ops.lookup_constraint('db', 'new_table'))
        self.assertEqual(3, ops.cache_filled)

        # delete_column_constraints
        cache['db']['table']['column'] = 'constraint'
        self.assertEqual('constraint', ops.lookup_constraint('db', 'table', 'column'))
        ops.rm_column('table', 'column')
        self.assertEqual([], ops.lookup_constraint('db', 'table', 'column'))
        self.assertEqual([], ops.lookup_constraint('db', 'table', 'noexist_column'))

        # copy_column_constraints
        cache['db']['table']['column'] = 'constraint'
        self.assertEqual('constraint', ops.lookup_constraint('db', 'table', 'column'))
        ops.cp_column('table', 'column', 'column_new')
        self.assertEqual('constraint', ops.lookup_constraint('db', 'table', 'column_new'))
        self.assertEqual('constraint', ops.lookup_constraint('db', 'table', 'column'))

        # copy + delete
        cache['db']['table']['column'] = 'constraint'
        self.assertEqual('constraint', ops.lookup_constraint('db', 'table', 'column'))
        ops.mv_column('table', 'column', 'column_new')
        self.assertEqual('constraint', ops.lookup_constraint('db', 'table', 'column_new'))
        self.assertEqual([], ops.lookup_constraint('db', 'table', 'column'))

    def test_valid(self):
        ops = self.CacheOps()
        # none of these should vivify a table into a valid state
        self.assertFalse(ops._is_valid_cache('db', 'table'))
        self.assertFalse(ops._is_valid_cache('db', 'table'))
        ops.clear_con('table')
        self.assertFalse(ops._is_valid_cache('db', 'table'))
        ops.rm_column('table', 'column')
        self.assertFalse(ops._is_valid_cache('db', 'table'))

        # these should change the cache state
        ops.lookup_constraint('db', 'table')
        self.assertTrue(ops._is_valid_cache('db', 'table'))
        ops.lookup_constraint('db', 'table', 'column')
        self.assertTrue(ops._is_valid_cache('db', 'table'))
        ops.clear_con('table')
        self.assertFalse(ops._is_valid_cache('db', 'table'))

    def test_valid_implementation(self):
        # generic fills the cache on a per-table basis
        ops = self.CacheOps()
        self.assertFalse(ops._is_valid_cache('db', 'table'))
        self.assertFalse(ops._is_valid_cache('db', 'other_table'))
        ops.lookup_constraint('db', 'table')
        self.assertTrue(ops._is_valid_cache('db', 'table'))
        self.assertFalse(ops._is_valid_cache('db', 'other_table'))
        ops.lookup_constraint('db', 'other_table')
        self.assertTrue(ops._is_valid_cache('db', 'table'))
        self.assertTrue(ops._is_valid_cache('db', 'other_table'))
        ops.clear_con('table')
        self.assertFalse(ops._is_valid_cache('db', 'table'))
        self.assertTrue(ops._is_valid_cache('db', 'other_table'))

if mysql:
    class TestCacheMysql(TestCacheGeneric):
        base_ops_cls = mysql.DatabaseOperations

        def test_valid_implementation(self):
            # mysql fills the cache on a per-db basis
            ops = self.CacheOps()
            self.assertFalse(ops._is_valid_cache('db', 'table'))
            self.assertFalse(ops._is_valid_cache('db', 'other_table'))
            ops.lookup_constraint('db', 'table')
            self.assertTrue(ops._is_valid_cache('db', 'table'))
            self.assertTrue(ops._is_valid_cache('db', 'other_table'))
            ops.lookup_constraint('db', 'other_table')
            self.assertTrue(ops._is_valid_cache('db', 'table'))
            self.assertTrue(ops._is_valid_cache('db', 'other_table'))
            ops.clear_con('table')
            self.assertFalse(ops._is_valid_cache('db', 'table'))
            self.assertTrue(ops._is_valid_cache('db', 'other_table'))
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.