django-pyodbc: MSSQL unicode问题

Question

我在使用django-pyodbc、freetds和unixodbc在Django上登录用户时遇到了问题。我可以运行syncdb并与pyodbc连接，没有任何问题。

我得到的全部错误是：

 ('42000', '[42000] [FreeTDS][SQL Server]Unicode data in a Unicode-only collation or ntext data cannot be sent to clients using DB-Library (such as ISQL) or ODBC version 3.7 or earlier. (4004) (SQLExecDirectW)

freetds conf文件：

[PS123]
host = <ip number>
port = 2254
tds version = 8.0
instance = T_INS01
client charset = UTF-8

# somebody suggested this had to be global so I put it here as well
[global]
client charset = UTF-8
tds version = 8.0

odbcinst.ini

[ODBC]
Trace = Yes
TraceFile = /tmp/odbc.log

[FreeTDS]
Description = TDS driver (Sybase/MS SQL)
Driver = /usr/lib/x86_64-linux-gnu/odbc/libtdsodbc.so
Setup =  /usr/lib/x86_64-linux-gnu/odbc/libtdsS.so
UsageCount = 1
tds_version = 8.0 # several people suggested using underscore

odbc.ini

[PS123]
Driver = FreeTDS
Description = A wonderful description goes here
tds_version = 8.0 # also tried without underscore here
Database = database
Servername = PS123
Trace = Yes
TraceFile = /tmp/freetdssql.log

如果我通过django-debug-toolbar's debugsqlshell登录用户，我可以看到这些查询发生在异常之前：

In [10]: login(request, user)
SELECT TOP 1 (1) AS [a] FROM [django_session] WHERE [django_session].[session_key] = magyul563p13z6e33t6rexesaxx1kszx [5.03ms]
INSERT INTO [django_session] ([session_key], [session_data], [expire_date])
VALUES (magyul563p13z6e33t6rexesaxx1kszx,
        ZjgwN2E1NGZhNTE4YTI2ZWQxMDM3M2ZlZThiNWVlY2NlYTlmZWQ1YzqAAn1xAS4=, 2014-02-14 10:20:31+00:00) [3.23ms]
SELECT [django_session].[session_key], [django_session].[session_data], [django_session].[expire_date] FROM [django_session] WHERE [django_session].[session_key] = magyul563p13z6e33t6rexesaxx1kszx [1.56ms]

但是，当我只使用pyodbc运行这些查询时，如下所示：

import pyodbc
cnx = pyodbc.connect("DSN=PS123;UID=username;PWD=password")

cursor = cnx.cursor()
cursor.execute("SELECT TOP 1 (1) AS [a] FROM [django_session] WHERE [django_session].[session_key] = 'azozj51b9a5y9lnbq2b4hydhrryrplpz'")
cursor.execute("INSERT INTO [django_session] ([session_key], [session_data], [expire_date]) VALUES ('azozj51b9a5y9lnbq2b4hyd', 'ZwN2E1NGZhNTE4YTI2ZWQxMDM3M2ZlZThiNWVlY2NlYTlmZWQ1YzqAAn1x', '2014-02-15')")
cursor.execute("SELECT [django_session].[session_key], [django_session].[session_data], [django_session].[expire_date] FROM [django_session] WHERE [django_session].[session_key] = 'azozj51b9a5y9lnbq2b4hyd'")

它获取和插入没有任何问题。唯一的问题是我必须删除日期字符串中的时间和时区。我认为这与我的问题无关。

这些是我的Django数据库设置：

DATABASES = {
    'default': {
        'ENGINE': 'sql_server.pyodbc', # also tried django_pyodbc
        'NAME': 'database',          
        'USER': 'username',
        'PASSWORD': 'password', 
        'HOST': 'PS123',
        'PORT': '2254', 
        'OPTIONS': {
           'host_is_server': True
        },
    }
}

完整回溯：

Traceback:
File "/usr/local/lib/python2.7/dist-packages/django/core/handlers/base.py" in get_response
  115.                         response = callback(request, *callback_args, **callback_kwargs)
File "/usr/local/lib/python2.7/dist-packages/django/contrib/admin/sites.py" in wrapper
  219.                 return self.admin_view(view, cacheable)(*args, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/django/utils/decorators.py" in _wrapped_view
  91.                     response = view_func(request, *args, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/django/views/decorators/cache.py" in _wrapped_view_func
  89.         response = view_func(request, *args, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/django/contrib/admin/sites.py" in inner
  196.             if not self.has_permission(request):
File "/usr/local/lib/python2.7/dist-packages/django/contrib/admin/sites.py" in has_permission
  149.         return request.user.is_active and request.user.is_staff
File "/usr/local/lib/python2.7/dist-packages/django/utils/functional.py" in inner
  204.             self._setup()
File "/usr/local/lib/python2.7/dist-packages/django/utils/functional.py" in _setup
  270.         self._wrapped = self._setupfunc()
File "/usr/local/lib/python2.7/dist-packages/django/contrib/auth/middleware.py" in <lambda>
  18.         request.user = SimpleLazyObject(lambda: get_user(request))
File "/usr/local/lib/python2.7/dist-packages/django/contrib/auth/middleware.py" in get_user
  10.         request._cached_user = auth.get_user(request)
File "/usr/local/lib/python2.7/dist-packages/django/contrib/auth/__init__.py" in get_user
  136.         user_id = request.session[SESSION_KEY]
File "/usr/local/lib/python2.7/dist-packages/django/contrib/sessions/backends/base.py" in __getitem__
  44.         return self._session[key]
File "/usr/local/lib/python2.7/dist-packages/django/contrib/sessions/backends/base.py" in _get_session
  167.                 self._session_cache = self.load()
File "/usr/local/lib/python2.7/dist-packages/django/contrib/sessions/backends/db.py" in load
  18.                 expire_date__gt=timezone.now()
File "/usr/local/lib/python2.7/dist-packages/django/db/models/manager.py" in get
  143.         return self.get_query_set().get(*args, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/django/db/models/query.py" in get
  398.         num = len(clone)
File "/usr/local/lib/python2.7/dist-packages/django/db/models/query.py" in __len__
  106.                 self._result_cache = list(self.iterator())
File "/usr/local/lib/python2.7/dist-packages/django/db/models/query.py" in iterator
  317.         for row in compiler.results_iter():
File "/usr/local/lib/python2.7/dist-packages/django/db/models/sql/compiler.py" in results_iter
  775.         for rows in self.execute_sql(MULTI):
File "/usr/local/lib/python2.7/dist-packages/django/db/models/sql/compiler.py" in execute_sql
  846.         cursor.execute(sql, params)
File "/usr/local/lib/python2.7/dist-packages/django/db/backends/util.py" in execute
  41.             return self.cursor.execute(sql, params)
File "/usr/local/lib/python2.7/dist-packages/sql_server/pyodbc/base.py" in execute
  396.             raise utils.DatabaseError(*e.args)

Exception Type: DatabaseError at /admin/
Exception Value: ('42000', '[42000] [FreeTDS][SQL Server]Unicode data in a Unicode-only collation or ntext data cannot be sent to clients using DB-Library (such as ISQL) or ODBC version 3.7 or earlier. (4004) (SQLExecDirectW)')

Answer 1

我还建议在选项中包括以下内容，以确保Unicode结果：

'OPTIONS': {
    'host_is_server': True,
    'autocommit': True,
    'unicode_results': True,
    'extra_params': 'tds_version=8.0'
},

Django 1.6也需要自动提交选项。当您以这种方式连接时，它会绕过您可能设置的任何DSN。

编辑： Django的1.6版文件报告“从Django 1.6开始，默认情况下自动提交是打开的”，所以我想您不需要设置这个

Answer 2

结果，我还必须在Django数据库设置中指定TDS版本：

'OPTIONS' : { 'host_is_server' : True, 'extra_params' : 'TDS_VERSION=8.0', }

我希望这能帮上忙。