[1.7.x] Fixed #23426 -- Don't require double percent sign in RunSQL without parameters

Backport of b9a670b227 from master

django/db/migrations/operations/special.py

@@ -66,14 +66,14 @@ class RunSQL(Operation):
     def database_forwards(self, app_label, schema_editor, from_state, to_state):
         statements = schema_editor.connection.ops.prepare_sql_script(self.sql)
         for statement in statements:
-            schema_editor.execute(statement)
+            schema_editor.execute(statement, params=None)
 
     def database_backwards(self, app_label, schema_editor, from_state, to_state):
         if self.reverse_sql is None:
             raise NotImplementedError("You cannot reverse this operation")
         statements = schema_editor.connection.ops.prepare_sql_script(self.reverse_sql)
         for statement in statements:
-            schema_editor.execute(statement)
+            schema_editor.execute(statement, params=None)
 
     def describe(self):
         return "Raw SQL operation"

docs/ref/migration-operations.txt

@@ -192,6 +192,11 @@ operation here so that the autodetector still has an up-to-date state of the
 model (otherwise, when you next run ``makemigrations``, it won't see any
 operation that adds that field and so will try to run it again).
 
+.. versionchanged:: 1.7.1
+
+    If you want to include literal percent signs in the query you don't need to
+    double them anymore.
+
 .. _sqlparse: https://pypi.python.org/pypi/sqlparse
 
 RunPython

docs/releases/1.7.1.txt

@@ -67,3 +67,6 @@ Bugfixes
   :meth:`~django.contrib.admin.InlineModelAdmin.get_min_num()` hooks to
   :class:`~django.contrib.contenttypes.admin.GenericInlineModelAdmin`
   (:ticket:`23539`).
+
+* Made ``migrations.RunSQL`` no longer require percent sign escaping. This is
+  now consistent with ``cursor.execute()`` (:ticket:`23426`).

tests/migrations/test_operations.py

@@ -1156,10 +1156,18 @@ class OperationTests(OperationTestBase):
         # Create the operation
         operation = migrations.RunSQL(
             # Use a multi-line string with a comment to test splitting on SQLite and MySQL respectively
-            "CREATE TABLE i_love_ponies (id int, special_thing int);\n"
+            "CREATE TABLE i_love_ponies (id int, special_thing varchar(15));\n"
-            "INSERT INTO i_love_ponies (id, special_thing) VALUES (1, 42); -- this is magic!\n"
+            "INSERT INTO i_love_ponies (id, special_thing) VALUES (1, 'i love ponies'); -- this is magic!\n"
-            "INSERT INTO i_love_ponies (id, special_thing) VALUES (2, 51);\n",
+            "INSERT INTO i_love_ponies (id, special_thing) VALUES (2, 'i love django');\n"
+            "UPDATE i_love_ponies SET special_thing = 'Ponies' WHERE special_thing LIKE '%%ponies';"
+            "UPDATE i_love_ponies SET special_thing = 'Django' WHERE special_thing LIKE '%django';",
+
+            # Run delete queries to test for parameter substitution failure
+            # reported in #23426
+            "DELETE FROM i_love_ponies WHERE special_thing LIKE '%Django%';"
+            "DELETE FROM i_love_ponies WHERE special_thing LIKE '%%Ponies%%';"
             "DROP TABLE i_love_ponies",
+
             state_operations=[migrations.CreateModel("SomethingElse", [("id", models.AutoField(primary_key=True))])],
         )
         self.assertEqual(operation.describe(), "Raw SQL operation")
@@ -1177,6 +1185,10 @@ class OperationTests(OperationTestBase):
         with connection.cursor() as cursor:
             cursor.execute("SELECT COUNT(*) FROM i_love_ponies")
             self.assertEqual(cursor.fetchall()[0][0], 2)
+            cursor.execute("SELECT COUNT(*) FROM i_love_ponies WHERE special_thing = 'Django'")
+            self.assertEqual(cursor.fetchall()[0][0], 1)
+            cursor.execute("SELECT COUNT(*) FROM i_love_ponies WHERE special_thing = 'Ponies'")
+            self.assertEqual(cursor.fetchall()[0][0], 1)
         # And test reversal
         self.assertTrue(operation.reversible)
         with connection.schema_editor() as editor: