我不知道为什么会收到此错误，并且找不到任何解决方案。我可以使用 freetds tsql 连接到 SQL Server 数据库，但在使用连接时不断收到错误pymssql.connect.
具体错误是：
pymssql.OperationalError: (18456,“用户‘xxx’登录失败。DB-Lib 错误消息 18456，严重性 14:\n常规 SQL Server
错误：检查来自 SQL Server\nDB-Lib 的消息错误消息 20002，
严重性 9:\nAdaptive Server 连接失败\n")
我将 freetds 的配置设置为：
[custom_config]
host = myhost
port = 1433
tds version = 7.0
encryption = request
dump file = /tmp/freetds.log
running:
tsql -S custom_config -U tsmv -P xxx
returns:
locale is "en_US.UTF-8"
locale charset is "UTF-8"
using default charset "UTF-8"
1>
这允许我查询数据库。
但是，运行：
python
>> import pymssql
>> pymssql.connect(server='custom_config', user='user', password='xxx', database='database')
引发上述错误。
我正在使用Linux CentOS，python 2.6.6，freetds 0.92 dev（我尝试过使用tdsver = 7.0编译的其他版本）。
freetds 日志是：
log.c:196:Starting log file for FreeTDS 0.92
on 2012-04-12 10:39:15 with debug flags 0x4fff.
iconv.c:330:tds_iconv_open(0x1391b70, ISO-8859-1)
iconv.c:187:local name for ISO-8859-1 is ISO-8859-1
iconv.c:187:local name for UTF-8 is UTF-8
iconv.c:187:local name for UCS-2LE is UCS-2LE
iconv.c:187:local name for UCS-2BE is UCS-2BE
iconv.c:349:setting up conversions for client charset "ISO-8859-1"
iconv.c:351:preparing iconv for "ISO-8859-1" <-> "UCS-2LE" conversion
iconv.c:391:preparing iconv for "ISO-8859-1" <-> "UCS-2LE" conversion
iconv.c:394:tds_iconv_open: done
net.c:205:Connecting to xx.x.x.xxx port 1433 (TDS version 7.1)
net.c:270:tds_open_socket: connect(2) returned "Operation now in progress"
net.c:310:tds_open_socket() succeeded
util.c:156:Changed query state from DEAD to IDLE
net.c:741:Sending packet
0000 12 01 00 34 00 00 00 00-00 00 15 00 06 01 00 1b |...4.... ........|
0010 00 01 02 00 1c 00 0c 03-00 28 00 04 ff 08 00 01 |........ .(......|
0020 55 00 00 02 4d 53 53 51-4c 53 65 72 76 65 72 00 |U...MSSQ LServer.|
0030 c7 39 00 00 - |.9..|
net.c:555:Received header
0000 04 01 00 25 00 00 01 00- |...%....|
net.c:609:Received packet
0000 04 01 00 25 00 00 01 00-00 00 15 00 06 01 00 1b |...%.... ........|
0010 00 01 02 00 1c 00 01 03-00 1d 00 00 ff 0a 00 0f |........ ........|
0020 a0 00 00 02 00 - |.....|
login.c:1057:detected flag 2
login.c:782:quietly sending TDS 7+ login packet
token.c:328:tds_process_login_tokens()
net.c:555:Received header
0000 04 01 00 72 00 51 01 00- |...r.Q..|
net.c:609:Received packet
0000 04 01 00 72 00 51 01 00-aa 5e 00 18 48 00 00 01 |...r.Q.. .^..H...|
0010 0e 1d 00 4c 00 6f 00 67-00 69 00 6e 00 20 00 66 |...L.o.g .i.n. .f|
0020 00 61 00 69 00 6c 00 65-00 64 00 20 00 66 00 6f |.a.i.l.e .d. .f.o|
0030 00 72 00 20 00 75 00 73-00 65 00 72 00 20 00 27 |.r. .u.s .e.r. .'|
0040 00 74 00 73 00 6d 00 76-00 27 00 2e 00 0c 4d 00 |.t.s.m.v .'....M.|
0050 43 00 53 00 2d 00 44 00-41 00 54 00 41 00 42 00 |C.S.-.D. A.T.A.B.|
0060 41 00 53 00 45 00 00 01-00 fd 02 00 00 00 00 00 |A.S.E... ........|
0070 00 00 - |..|
token.c:337:looking for login token, got aa(ERROR)
token.c:122:tds_process_default_tokens() marker is aa(ERROR)
token.c:2588:tds_process_msg() reading message 18456 from server
token.c:2661:tds_process_msg() calling client msg handler
dbutil.c:85:_dblib_handle_info_message(0x14e2e30, 0x1391b70, 0x7fff8b047e40)
dbutil.c:86:msgno 18456: "Login failed for user 'xxx'."
token.c:2674:tds_process_msg() returning TDS_SUCCEED
token.c:337:looking for login token, got fd(DONE)
token.c:122:tds_process_default_tokens() marker is fd(DONE)
token.c:2339:tds_process_end: more_results = 0
was_cancelled = 0
error = 1
done_count_valid = 0
token.c:2355:tds_process_end() state set to TDS_IDLE
token.c:2370: rows_affected = 0
token.c:438:tds_process_login_tokens() returning TDS_FAIL
login.c:466:login packet accepted
util.c:156:Changed query state from IDLE to DEAD
util.c:331:tdserror(0x14e2e30, 0x1391b70, 20002, 0)
dblib.c:7929:dbperror(0x1383c70, 20002, 0)
dblib.c:7981:20002: "Adaptive Server connection failed"
dblib.c:8002:"Adaptive Server connection failed", client returns 2 (INT_CANCEL)
util.c:361:tdserror: client library returned TDS_INT_CANCEL(2)
util.c:384:tdserror: returning TDS_INT_CANCEL(2)
dblib.c:1443:dbclose(0x1383c70)
dblib.c:258:dblib_del_connection(0x7fa462faf540, 0x1391b70)
mem.c:615:tds_free_all_results()
dblib.c:305:dblib_release_tds_ctx(1)
dblib.c:5882:dbfreebuf(0x1383c70)
dblib.c:739:dbloginfree(0x1533a40)
我完全不明白为什么这不起作用。任何帮助将非常感激。
