bulk_create with empty model fields fails on oracle

[sns1081@…]

I did the minimal example for reproducing this bug. Model looks very simple:

class ProbaModel(models.Model):
    num = models.IntegerField(null=True, blank=True)

When i tried to run the following test code:

class ProbaTestCase(TestCase):
    def test_bulk_create(self):
        ProbaModel.objects.bulk_create(
            [
                ProbaModel(num=1),
                ProbaModel()
            ]
        )

I got an

Traceback (most recent call last):
  File "/home/sns/devel/proba/proba/app1/tests.py", line 10, in test_bulk_create
    ProbaModel()
  File "/home/sns/devel/proba/local/lib/python2.7/site-packages/django/db/models/manager.py", line 160, in bulk_create
    return self.get_queryset().bulk_create(*args, **kwargs)
  File "/home/sns/devel/proba/local/lib/python2.7/site-packages/django/db/models/query.py", line 359, in bulk_create
    self._batched_insert(objs_without_pk, fields, batch_size)
  File "/home/sns/devel/proba/local/lib/python2.7/site-packages/django/db/models/query.py", line 838, in _batched_insert
    using=self.db)
  File "/home/sns/devel/proba/local/lib/python2.7/site-packages/django/db/models/manager.py", line 232, in _insert
    return insert_query(self.model, objs, fields, **kwargs)
  File "/home/sns/devel/proba/local/lib/python2.7/site-packages/django/db/models/query.py", line 1514, in insert_query
    return query.get_compiler(using=using).execute_sql(return_id)
  File "/home/sns/devel/proba/local/lib/python2.7/site-packages/django/db/models/sql/compiler.py", line 903, in execute_sql
    cursor.execute(sql, params)
  File "/home/sns/devel/proba/local/lib/python2.7/site-packages/django/db/backends/util.py", line 53, in execute
    return self.cursor.execute(sql, params)
  File "/home/sns/devel/proba/local/lib/python2.7/site-packages/django/db/utils.py", line 99, in __exit__
    six.reraise(dj_exc_type, dj_exc_value, traceback)
  File "/home/sns/devel/proba/local/lib/python2.7/site-packages/django/db/backends/util.py", line 53, in execute
    return self.cursor.execute(sql, params)
  File "/home/sns/devel/proba/local/lib/python2.7/site-packages/django/db/backends/oracle/base.py", line 816, in execute
    return self.cursor.execute(query, self._param_generator(params))
DatabaseError: ORA-01790: expression must have same datatype as corresponding expression

This bug confirmed on Oracle 11.2.0.4 and 12. Complete project located on my GitHub: ​https://github.com/nsadovskiy/bulk_create_fail

Solution that works fo me is patch on django/db/backends/oracle/base.py:

*** base.py	2014-05-20 18:37:07.000000000 +0700
--- base.py	2014-05-20 18:41:45.000000000 +0700
***************
*** 467,509 ****
          return '%s_TR' % util.truncate_name(table, name_length).upper()
  
      def bulk_insert_sql(self, fields, num_values):
!         MAPPER = {
!             'CharField': 'to_nchar(%s)',
!             'CommaSeparatedIntegerField': 'to_nchar(%s)',
!             'EmailField': 'to_nchar(%s)',
!             'FileField': 'to_nchar(%s)',
!             'FilePathField': 'to_nchar(%s)',
!             'ImageField': 'to_nchar(%s)',
!             'SlugField': 'to_nchar(%s)',
!             'URLField': 'to_nchar(%s)',
! 
!             'IPAddressField': 'to_char(%s)',
!             'GenericIPAddressField': 'to_char(%s)',
! 
!             'AutoField': 'to_number(%s)',
!             'BigIntegerField': 'to_number(%s)',
!             'BooleanField': 'to_number(%s)',
!             'DecimalField': 'to_number(%s)',
!             'FloatField': 'to_number(%s)',
!             'IntegerField': 'to_number(%s)',
!             'NullBooleanField': 'to_number(%s)',
!             'PositiveIntegerField': 'to_number(%s)',
!             'PositiveSmallIntegerField': 'to_number(%s)',
!             'SmallIntegerField': 'to_number(%s)',
!             'ForeignKey': 'to_number(%s)',
!             'ManyToManyField': 'to_number(%s)',
!             'OneToOneField': 'to_number(%s)',
! 
!             'DateField': 'to_date(%s)',
! 
!             'DateTimeField': 'to_timestamp(%s)',
!             'TimeField': 'to_timestamp(%s)',
! 
!             'BinaryField': 'to_blob(%s)',
! 
!             'TextField': 'to_nclob(%s)'
!         }
!         items_sql = "SELECT %s FROM DUAL" % ", ".join([MAPPER.get(field.get_internal_type(), '%s') for field in fields])
          return " UNION ALL ".join([items_sql] * num_values)
  
  
--- 467,473 ----
          return '%s_TR' % util.truncate_name(table, name_length).upper()
  
      def bulk_insert_sql(self, fields, num_values):
!         items_sql = "SELECT %s FROM DUAL" % ", ".join(["%s"] * len(fields))
          return " UNION ALL ".join([items_sql] * num_values)
  

[Aymeric Augustin]

Double post of #22669.