[1.5.x] Fixed Oracle failure for "%" in table name

Backpatch of 2249bd275c

django/db/backends/oracle/base.py

@@ -256,6 +256,10 @@ WHEN (new.%(col_name)s IS NULL)
         if not name.startswith('"') and not name.endswith('"'):
             name = '"%s"' % util.truncate_name(name.upper(),
                                                self.max_name_length())
+        # Oracle puts the query text into a (query % args) construct, so % signs
+        # in names need to be escaped. The '%%' will be collapsed back to '%' at
+        # that stage so we aren't really making the name longer here.
+        name = name.replace('%','%%')
         return name.upper()
 
     def random_function_sql(self):

tests/regressiontests/backends/tests.py

@@ -25,6 +25,14 @@ from . import models
 
 class OracleChecks(unittest.TestCase):
 
+    @unittest.skipUnless(connection.vendor == 'oracle',
+                         "No need to check Oracle quote_name semantics")
+    def test_quote_name(self):
+        # Check that '%' chars are escaped for query execution.
+        name = '"SOME%NAME"'
+        quoted_name = connection.ops.quote_name(name)
+        self.assertEquals(quoted_name % (), name)
+
     @unittest.skipUnless(connection.vendor == 'oracle',
                          "No need to check Oracle cursor semantics")
     def test_dbms_session(self):

tests/regressiontests/inspectdb/tests.py

@@ -1,6 +1,7 @@
 from __future__ import unicode_literals
 
 from django.core.management import call_command
+from django.db import connection
 from django.test import TestCase, skipUnlessDBFeature
 from django.utils.six import StringIO
 
@@ -60,14 +61,16 @@ class InspectDBTestCase(TestCase):
         self.assertIn("number_45extra = models.CharField", output)
 
     def test_special_column_name_introspection(self):
-        """Introspection of column names containing special characters,
+        """
+        Introspection of column names containing special characters,
         unsuitable for Python identifiers
         """
         out = StringIO()
         call_command('inspectdb', stdout=out)
         output = out.getvalue()
+        base_name = 'Field' if connection.vendor != 'oracle' else 'field'
         self.assertIn("field = models.IntegerField()", output)
-        self.assertIn("field_field = models.IntegerField(db_column='Field_')", output)
+        self.assertIn("field_field = models.IntegerField(db_column='%s_')" % base_name, output)
-        self.assertIn("field_field_0 = models.IntegerField(db_column='Field__')", output)
+        self.assertIn("field_field_0 = models.IntegerField(db_column='%s__')" % base_name, output)
         self.assertIn("field_field_1 = models.IntegerField(db_column='__field')", output)
         self.assertIn("prc_x = models.IntegerField(db_column='prc(%) x')", output)