Fixed #4664 -- Forced the client character set encoding to UTF-8 for …

…PostgreSQL

(via the psycopg backend). The previous version was causing problems on some
setups, particularly PostgreSQL 7.x. Current code should work with 7.x and 8.x,
no matter what the default client encoding is.


git-svn-id: http://code.djangoproject.com/svn/django/branches/unicode@5535 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/db/backends/postgresql/base.py

@@ -6,7 +6,6 @@
 
 from django.utils.encoding import smart_str, smart_unicode
 from django.db.backends import util
-from django.db.backends.postgresql.encodings import ENCODING_MAP
 try:
     import psycopg as Database
 except ImportError, e:
@@ -64,7 +63,6 @@ def __getattr__(self, attr):
             return getattr(self.cursor, attr)
 
 postgres_version = None
-client_encoding = None
 
 class DatabaseWrapper(local):
     def __init__(self, **kwargs):
@@ -94,15 +92,8 @@ def cursor(self):
         cursor = self.connection.cursor()
         if set_tz:
             cursor.execute("SET TIME ZONE %s", [settings.TIME_ZONE])
-        cursor.execute("SHOW client_encoding")
-        encoding = ENCODING_MAP[cursor.fetchone()[0]]
-        cursor = UnicodeCursorWrapper(cursor, encoding)
-        global client_encoding
-        if not client_encoding:
-            # We assume the client encoding isn't going to change for random
-            # reasons.
-            Database.register_type(Database.new_type(Database.types[1043].values, 'STRING', typecast_string))
-            client_encoding = encoding
+        cursor.execute("SET client_encoding to 'UNICODE'")
+        cursor = UnicodeCursorWrapper(cursor, 'utf-8')
         global postgres_version
         if not postgres_version:
             cursor.execute("SELECT version()")
@@ -289,7 +280,7 @@ def typecast_string(s):
     """
     if not s:
         return s
-    return smart_unicode(s, client_encoding)
+    return smart_unicode(s)
 
 # Register these custom typecasts, because Django expects dates/times to be
 # in Python's native (standard-library) datetime/time format, whereas psycopg
@@ -302,6 +293,7 @@ def typecast_string(s):
 Database.register_type(Database.new_type((1114,1184), "TIMESTAMP", util.typecast_timestamp))
 Database.register_type(Database.new_type((16,), "BOOLEAN", util.typecast_boolean))
 Database.register_type(Database.new_type((1700,), "NUMERIC", util.typecast_decimal))
+Database.register_type(Database.new_type(Database.types[1043].values, 'STRING', typecast_string))
 
 OPERATOR_MAPPING = {
     'exact': '= %s',