From 23964a7b9a57892c3916ddf6722f74a76072f6e3 Mon Sep 17 00:00:00 2001
From: Adrian Holovaty <adrian@holovaty.com>
Date: Fri, 11 Aug 2006 05:20:31 +0000
Subject: [PATCH] Fixed #2458 -- DB API now properly escapes backslashes, so
 you don't have to double-escape them. Thanks, tom@eggdrop.ch

git-svn-id: http://code.djangoproject.com/svn/django/trunk@3552 bcc190cf-cafb-0310-a4f2-bffc1f526a37
---
 AUTHORS                             |  1 +
 django/db/models/fields/__init__.py |  2 +-
 tests/modeltests/lookup/models.py   | 13 +++++++++++--
 3 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/AUTHORS b/AUTHORS
index 60d684bc42..2067a5984d 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -125,6 +125,7 @@ answer newbie questions, and generally made Django that much better:
     Ivan Sagalaev (Maniac) <http://www.softwaremaniacs.org/>
     David Schein
     sopel
+    Thomas Steinacher <tom@eggdrop.ch>
     Radek Švarz <http://www.svarz.cz/translate/>
     Swaroop C H <http://www.swaroopch.info>
     Aaron Swartz <http://www.aaronsw.com/>
diff --git a/django/db/models/fields/__init__.py b/django/db/models/fields/__init__.py
index 690695c75d..49eb594838 100644
--- a/django/db/models/fields/__init__.py
+++ b/django/db/models/fields/__init__.py
@@ -20,7 +20,7 @@ BLANK_CHOICE_DASH = [("", "---------")]
 BLANK_CHOICE_NONE = [("", "None")]
 
 # prepares a value for use in a LIKE query
-prep_for_like_query = lambda x: str(x).replace("%", "\%").replace("_", "\_")
+prep_for_like_query = lambda x: str(x).replace("\\", "\\\\").replace("%", "\%").replace("_", "\_")
 
 # returns the <ul> class for a given radio_admin value
 get_ul_class = lambda x: 'radiolist%s' % ((x == HORIZONTAL) and ' inline' or '')
diff --git a/tests/modeltests/lookup/models.py b/tests/modeltests/lookup/models.py
index a2c0a14158..55bb373a4b 100644
--- a/tests/modeltests/lookup/models.py
+++ b/tests/modeltests/lookup/models.py
@@ -15,7 +15,7 @@ class Article(models.Model):
     def __str__(self):
         return self.headline
 
-API_TESTS = """
+API_TESTS = r"""
 # Create a couple of Articles.
 >>> from datetime import datetime
 >>> a1 = Article(headline='Article 1', pub_date=datetime(2005, 7, 26))
@@ -161,13 +161,14 @@ DoesNotExist: Article matching query does not exist.
 <Article: Article 1>
 
 # Underscores and percent signs have special meaning in the underlying
-# database library, but Django handles the quoting of them automatically.
+# SQL code, but Django handles the quoting of them automatically.
 >>> a8 = Article(headline='Article_ with underscore', pub_date=datetime(2005, 11, 20))
 >>> a8.save()
 >>> Article.objects.filter(headline__startswith='Article')
 [<Article: Article_ with underscore>, <Article: Article 5>, <Article: Article 6>, <Article: Article 4>, <Article: Article 2>, <Article: Article 3>, <Article: Article 7>, <Article: Article 1>]
 >>> Article.objects.filter(headline__startswith='Article_')
 [<Article: Article_ with underscore>]
+
 >>> a9 = Article(headline='Article% with percent sign', pub_date=datetime(2005, 11, 21))
 >>> a9.save()
 >>> Article.objects.filter(headline__startswith='Article')
@@ -182,4 +183,12 @@ DoesNotExist: Article matching query does not exist.
 [<Article: Article% with percent sign>, <Article: Article 5>, <Article: Article 6>, <Article: Article 4>, <Article: Article 2>, <Article: Article 3>, <Article: Article 7>, <Article: Article 1>]
 >>> Article.objects.exclude(headline="Article 7")
 [<Article: Article% with percent sign>, <Article: Article_ with underscore>, <Article: Article 5>, <Article: Article 6>, <Article: Article 4>, <Article: Article 2>, <Article: Article 3>, <Article: Article 1>]
+
+# Backslashes also have special meaning in the underlying SQL code, but Django
+# automatically quotes them appropriately.
+>>> a10 = Article(headline='Article with \\ backslash', pub_date=datetime(2005, 11, 22))
+>>> a10.save()
+>>> Article.objects.filter(headline__contains='\\')
+[<Article: Article with \ backslash>]
+
 """