Fixed #22669 -- Fixed QuerySet.bulk_create() with empty model fields on Oracle.

django/db/backends/oracle/operations.py

@@ -9,7 +9,7 @@ from django.utils import timezone
 from django.utils.encoding import force_bytes, force_text
 
 from .base import Database
-from .utils import InsertIdVar, Oracle_datetime
+from .utils import BulkInsertMapper, InsertIdVar, Oracle_datetime
 
 
 class DatabaseOperations(BaseDatabaseOperations):
@@ -523,10 +523,18 @@ WHEN (new.%(col_name)s IS NULL)
         return truncate_name(trigger_name, name_length).upper()
 
     def bulk_insert_sql(self, fields, placeholder_rows):
-        return " UNION ALL ".join(
+        query = []
-            "SELECT %s FROM DUAL" % ", ".join(row)
+        for row in placeholder_rows:
-            for row in placeholder_rows
+            select = []
-        )
+            for i, placeholder in enumerate(row):
+                # A model without any fields has fields=[None].
+                if not fields[i]:
+                    select.append(placeholder)
+                else:
+                    internal_type = getattr(fields[i], 'target_field', fields[i]).get_internal_type()
+                    select.append(BulkInsertMapper.types.get(internal_type, '%s') % placeholder)
+            query.append('SELECT %s FROM DUAL' % ', '.join(select))
+        return ' UNION ALL '.join(query)
 
     def subtract_temporals(self, internal_type, lhs, rhs):
         if internal_type == 'DateField':

django/db/backends/oracle/utils.py

@@ -29,3 +29,27 @@ class Oracle_datetime(datetime.datetime):
             dt.year, dt.month, dt.day,
             dt.hour, dt.minute, dt.second, dt.microsecond,
         )
+
+
+class BulkInsertMapper:
+    BLOB = 'TO_BLOB(%s)'
+    DATE = 'TO_DATE(%s)'
+    INTERVAL = 'CAST(%s as INTERVAL DAY(9) TO SECOND(6))'
+    NUMBER = 'TO_NUMBER(%s)'
+    TIMESTAMP = 'TO_TIMESTAMP(%s)'
+
+    types = {
+        'BigIntegerField': NUMBER,
+        'BinaryField': BLOB,
+        'DateField': DATE,
+        'DateTimeField': TIMESTAMP,
+        'DecimalField': NUMBER,
+        'DurationField': INTERVAL,
+        'FloatField': NUMBER,
+        'IntegerField': NUMBER,
+        'NullBooleanField': NUMBER,
+        'PositiveIntegerField': NUMBER,
+        'PositiveSmallIntegerField': NUMBER,
+        'SmallIntegerField': NUMBER,
+        'TimeField': TIMESTAMP,
+    }

tests/bulk_create/models.py

@@ -1,4 +1,9 @@
+import datetime
+import uuid
+from decimal import Decimal
+
 from django.db import models
+from django.utils import timezone
 
 
 class Country(models.Model):
@@ -51,3 +56,32 @@ class TwoFields(models.Model):
 
 class NoFields(models.Model):
     pass
+
+
+class NullableFields(models.Model):
+    # Fields in db.backends.oracle.BulkInsertMapper
+    big_int_filed = models.BigIntegerField(null=True, default=1)
+    binary_field = models.BinaryField(null=True, default=b'data')
+    date_field = models.DateField(null=True, default=timezone.now)
+    datetime_field = models.DateTimeField(null=True, default=timezone.now)
+    decimal_field = models.DecimalField(null=True, max_digits=2, decimal_places=1, default=Decimal('1.1'))
+    duration_field = models.DurationField(null=True, default=datetime.timedelta(1))
+    float_field = models.FloatField(null=True, default=3.2)
+    integer_field = models.IntegerField(null=True, default=2)
+    null_boolean_field = models.NullBooleanField(null=True, default=False)
+    positive_integer_field = models.PositiveIntegerField(null=True, default=3)
+    positive_small_integer_field = models.PositiveSmallIntegerField(null=True, default=4)
+    small_integer_field = models.SmallIntegerField(null=True, default=5)
+    time_field = models.TimeField(null=True, default=timezone.now)
+    # Fields not required in BulkInsertMapper
+    char_field = models.CharField(null=True, max_length=4, default='char')
+    email_field = models.EmailField(null=True, default='user@example.com')
+    duration_field = models.DurationField(null=True, default=datetime.timedelta(1))
+    file_field = models.FileField(null=True, default='file.txt')
+    file_path_field = models.FilePathField(path='/tmp', null=True, default='file.txt')
+    generic_ip_address_field = models.GenericIPAddressField(null=True, default='127.0.0.1')
+    image_field = models.ImageField(null=True, default='image.jpg')
+    slug_field = models.SlugField(null=True, default='slug')
+    text_field = models.TextField(null=True, default='text')
+    url_field = models.URLField(null=True, default='/')
+    uuid_field = models.UUIDField(null=True, default=uuid.uuid4)

tests/bulk_create/tests.py

@@ -1,15 +1,16 @@
 from operator import attrgetter
 
 from django.db import connection
-from django.db.models import Value
+from django.db.models import FileField, Value
 from django.db.models.functions import Lower
 from django.test import (
     TestCase, override_settings, skipIfDBFeature, skipUnlessDBFeature,
 )
 
 from .models import (
-    Country, NoFields, Pizzeria, ProxyCountry, ProxyMultiCountry,
+    Country, NoFields, NullableFields, Pizzeria, ProxyCountry,
-    ProxyMultiProxyCountry, ProxyProxyCountry, Restaurant, State, TwoFields,
+    ProxyMultiCountry, ProxyMultiProxyCountry, ProxyProxyCountry, Restaurant,
+    State, TwoFields,
 )
 
 
@@ -204,6 +205,19 @@ class BulkCreateTests(TestCase):
         bbb = Restaurant.objects.filter(name="betty's beetroot bar")
         self.assertEqual(bbb.count(), 1)
 
+    @skipUnlessDBFeature('has_bulk_insert')
+    def test_bulk_insert_nullable_fields(self):
+        # NULL can be mixed with other values in nullable fields
+        nullable_fields = [field for field in NullableFields._meta.get_fields() if field.name != 'id']
+        NullableFields.objects.bulk_create([
+            NullableFields(**{field.name: None}) for field in nullable_fields
+        ])
+        self.assertEqual(NullableFields.objects.count(), len(nullable_fields))
+        for field in nullable_fields:
+            with self.subTest(field=field):
+                field_value = '' if isinstance(field, FileField) else None
+                self.assertEqual(NullableFields.objects.filter(**{field.name: field_value}).count(), 1)
+
     @skipUnlessDBFeature('can_return_ids_from_bulk_insert')
     def test_set_pk_and_insert_single_item(self):
         with self.assertNumQueries(1):