Fixed #28206 -- Fixed RawQuerySet crash on a model with a mixed case db_column pk on Oracle.

Thanks Tim Graham for the review.

tests/raw_query/models.py

@@ -32,6 +32,10 @@ class Coffee(models.Model):
     price = models.DecimalField(max_digits=10, decimal_places=2, default=0)
 
 
+class MixedCaseIDColumn(models.Model):
+    id = models.AutoField(primary_key=True, db_column='MiXeD_CaSe_Id')
+
+
 class Reviewer(models.Model):
     reviewed = models.ManyToManyField(Book)
 

tests/raw_query/tests.py

@@ -5,7 +5,10 @@ from django.db.models.query import RawQuerySet
 from django.db.models.query_utils import InvalidQuery
 from django.test import TestCase, skipUnlessDBFeature
 
-from .models import Author, Book, BookFkAsPk, Coffee, FriendlyAuthor, Reviewer
+from .models import (
+    Author, Book, BookFkAsPk, Coffee, FriendlyAuthor, MixedCaseIDColumn,
+    Reviewer,
+)
 
 
 class RawQueryTests(TestCase):
@@ -129,6 +132,14 @@ class RawQueryTests(TestCase):
         coffees = Coffee.objects.all()
         self.assertSuccessfulRawQuery(Coffee, query, coffees)
 
+    def test_pk_with_mixed_case_db_column(self):
+        """
+        A raw query with a model that has a pk db_column with mixed case.
+        """
+        query = "SELECT * FROM raw_query_mixedcaseidcolumn"
+        queryset = MixedCaseIDColumn.objects.all()
+        self.assertSuccessfulRawQuery(MixedCaseIDColumn, query, queryset)
+
     def test_order_handler(self):
         """
         Test of raw raw query's tolerance for columns being returned in any