Documented that case-insensitive matching is not supported for non-ASCII

strings in SQLite. Refs #9905.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@9705 bcc190cf-cafb-0310-a4f2-bffc1f526a37

docs/ref/databases.txt

@@ -265,6 +265,26 @@ of whether ``unique=True`` is specified or not.
 SQLite notes 
 ============ 
  
+SQLite_ provides an excellent development alternative for applications that
+are predominantly read-only or require a smaller installation footprint. As
+with all database servers, though, there are some differences that are
+specific to SQLite that you should be aware of.
+
+.. _SQLite: http://www.sqlite.org/
+
+.. _sqlite-string-matching:
+
+String matching for non-ASCII strings
+--------------------------------------
+
+SQLite doesn't support case-insensitive matching for non-ASCII strings. Some
+possible workarounds for this are `documented at sqlite.org`_, but they are
+not utilised by the default SQLite backend in Django. Therefore, if you are
+using the ``iexact`` lookup type in your queryset filters, be aware that it
+will not work as expected for non-ASCII strings.
+
+.. _documented at sqlite.org: http://www.sqlite.org/faq.html#q18
+
 Versions prior to 3.3.6
 ------------------------
 

docs/ref/models/querysets.txt

@@ -986,8 +986,15 @@ SQL equivalent::
 
     SELECT ... WHERE name ILIKE 'beatles blog';
 
-Note this will match ``'Beatles Blog'``, ``'beatles blog'``,
-``'BeAtLes BLoG'``, etc.
+Note this will match ``'Beatles Blog'``, ``'beatles blog'``, ``'BeAtLes
+BLoG'``, etc.
+
+.. admonition:: SQLite users
+
+    When using the SQLite backend and Unicode (non-ASCII) strings, bear in
+    mind the :ref:`database note <sqlite-string-matching>` about string
+    comparisons. SQLite does not do case-insensitive matching for Unicode
+    strings.
 
 contains
 ~~~~~~~~
@@ -1021,6 +1028,12 @@ SQL equivalent::
 
     SELECT ... WHERE headline ILIKE '%Lennon%';
 
+.. admonition:: SQLite users
+
+    When using the SQLite backend and Unicode (non-ASCII) strings, bear in
+    mind the :ref:`database note <sqlite-string-matching>` about string
+    comparisons.
+
 in
 ~~
 
@@ -1133,6 +1146,12 @@ SQL equivalent::
 
     SELECT ... WHERE headline ILIKE 'Will%';
 
+.. admonition:: SQLite users
+
+    When using the SQLite backend and Unicode (non-ASCII) strings, bear in
+    mind the :ref:`database note <sqlite-string-matching>` about string
+    comparisons.
+
 endswith
 ~~~~~~~~
 
@@ -1162,6 +1181,12 @@ SQL equivalent::
 
     SELECT ... WHERE headline ILIKE '%will'
 
+.. admonition:: SQLite users
+
+    When using the SQLite backend and Unicode (non-ASCII) strings, bear in
+    mind the :ref:`database note <sqlite-string-matching>` about string
+    comparisons.
+
 range
 ~~~~~