当我尝试在 python 中通过 Pymssql 连接到 Azure 数据库时，我遇到了这个错误：
pymssql.OperationalError: (20002, 'DB-Lib error message 20002, severity 9:\nAdaptive Server connection failed (iprice-bi.database.windows.net:1433)\n')
我通过tsql命令连接到数据库：
tsql -H server -p 1433 -U username -P password
locale is "en_US.UTF-8"
locale 字符集是“UTF-8” 使用默认字符集“UTF-8” 1> 选择@@版本 2> 开始
Microsoft SQL Azure (RTM) - 12.0.2000.8
Mar 1 2016 22:36:40
Copyright (c) Microsoft Corporation
(1 row affected)
我也检查了 freetds.conf 以确保我使用的是正确的版本。
[global]
# TDS protocol version
tds version = 7.0
dump file = /tmp/freetds.log
dump file append = yes
日志文件的结果也没有提供任何线索。
log.c:167:Starting log file for FreeTDS 0.95.87
on 2016-03-25 16:50:51 with debug flags 0x4fff.
dblib.c:1237:tdsdbopen: Calling tds_connect_and_login(0x23f9b00, 0x23fde90)
iconv.c:328:tds_iconv_open(0x23f9b00, UTF-8)
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:346:setting up conversions for client charset "UTF-8"
iconv.c:348:preparing iconv for "UTF-8" <-> "UCS-2LE" conversion
iconv.c:395:preparing iconv for "ISO-8859-1" <-> "UCS-2LE" conversion
iconv.c:400:tds_iconv_open: done
net.c:202:Connecting to 23.100.117.95 port 1433 (TDS version 7.1)
net.c:275:tds_open_socket: connect(2) returned "Operation now in progress"
net.c:314:tds_open_socket() succeeded
packet.c:740: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 d7 33 00 00 - |.3..|
packet.c:639: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 0c 00 02 |........ ........|
0020 bf 00 00 03 00 - |.....|
login.c:1106:detected flag 3
login.c:472:login packet rejected
query.c:3772:tds_disconnect()
util.c:165:Changed query state from IDLE to DEAD
util.c:322:tdserror(0x24f4290, 0x23f9b00, 20002, 0)
dblib.c:7925:dbperror(0x23f8fb0, 20002, 0)
dblib.c:7993:dbperror: Calling dblib_err_handler with msgno = 20002; msg->msgtext = "Adaptive Server connection failed (SERVERNAME:1433)"
dblib.c:8015:dbperror: dblib_err_handler for msgno = 20002; msg->msgtext = "Adaptive Server connection failed (SERVERNAME:1433)" -- returns 2 (INT_CANCEL)
util.c:352:tdserror: client library returned TDS_INT_CANCEL(2)
util.c:375:tdserror: returning TDS_INT_CANCEL(2)
dblib.c:1241:tdsdbopen: tds_connect_and_login failed for "SERVERNAMR:1433"!
dblib.c:1463:dbclose(0x23f8fb0)
dblib.c:243:dblib_del_connection(0x7f066cb036a0, 0x23f9b00)
mem.c:648:tds_free_all_results()
dblib.c:290:dblib_release_tds_ctx(1)
dblib.c:5873:dbfreebuf(0x23f8fb0)
dblib.c:743:dbloginfree(0x24439f0)
有人遇到这样的问题或者可以给我一些解决建议吗？！
你能试试这个连接字符串形式而不是显式吗？您的登录被拒绝：
login.c:472:login packet rejected
conn = pymssql.connect(
server="yourhost.example.com",
port=1433,
user="your_user",
password="your_pw",
database="your_db")
我假设你的 Azure DB 在 1433 上运行。这是我用于 SQL Server 的连接字符串，我过去只在 Azure 中使用过 pyodbc。您还可以在配置中将 TDS 版本设置为 7.1 而不是 7.0。如果那不能解决问题，还有几个问题（我会修改我的答案，直到我们弄清楚）：
根据我的经验，我认为您可以尝试将 tds 版本修改为适用于 MS SQL Server 2008+ 的 7.3。 tds 版本 7.0 对于 Azure SQL 数据库来说太低了。
请参阅我对其他 SO 线程的回答pymssql：有时只能连接到数据库.
就我而言，这只是一个身份验证问题。我认为 Nagios 不支持 Windows 身份验证模式。启用 SQL Server 身份验证模式后，消息消失，并显示一些严重错误。经过一些周期后，这些被清除并且计数器填充了合理的数字。
貌似没有人这样回答过：
升级pymssql。 2.1 的版本不适用于旧版本的 SQL Server。我们从 2012 升级到 2019 并从 SQL Server 得到错误：
DESCRIPTION: The prelogin packet used to open the
connection is structurally invalid; the connection has been closed.
Please contact the vendor of the client library. [CLIENT: your-ip]
在 python 方面显示为确切的错误“Adaptive Server 连接失败”
将 pymssql 升级到 2.2.2 或更高版本，它将解决您的问题。