pymssql 報20002錯誤解決辦法：DB-Lib error message 20002, severity 9

python 版本：3.6  win32 版本（因為一些特殊原因必須使用3.6）

pymssql 版本：2.2.0  

連接資料庫：

    import  pymssql
**
    def InitMssql(self):
        try:
            host = self.IniConfig.get('default','dbhost',"host***")
            user=  self.IniConfig.get('default','dbuser',"dbs***")
            password =  self.IniConfig.get('default','dbpassword',"pwd***")
            database =  self.IniConfig.get('default','dbdatabase',"db***")
            #self.DBconn = pymssql.connect(host,user,password,database,charset="GBK")
            self.DBconn = pymssql.connect(host,user,password,database)
            self.DBcursor = self.DBconn.cursor()
            sql = "SET TEXTSIZE 2147483647"
            self.DBcursor.execute(sql)
            self.DBconn.commit()
        except Exception as ex:
            if self.DBconn: self.DBconn.rollback()
            raise ex

報錯信息如下：

2023-11-19 22:27:06,374 - (20002, b'DB-Lib error message 20002, severity 9:\n
Adaptive Server connection failed (www.***.com)\n
DB-Lib error message 20002, severity 9:\nAdaptive Server connection failed (www.***.com)\n')
Traceback (most recent call last):
  File "src\\pymssql\\_pymssql.pyx", line 647, in pymssql._pymssql.connect
  File "src\\pymssql\\_mssql.pyx", line 2109, in pymssql._mssql.connect
  File "src\\pymssql\\_mssql.pyx", line 701, in pymssql._mssql.MSSQLConnection.__init__
  File "src\\pymssql\\_mssql.pyx", line 1818, in pymssql._mssql.maybe_raise_MSSQLDatabaseException
  File "src\\pymssql\\_mssql.pyx", line 1835, in pymssql._mssql.raise_MSSQLDatabaseException
pymssql._mssql.MSSQLDatabaseException: (20002, b'DB-Lib error message 20002, severity 9:\n
Adaptive Server connection failed (www.*****.com)\n
DB-Lib error message 20002, severity 9:\n
Adaptive Server connection failed (www.*****.com)\n')

During handling of the above exception, another exception occurred:

嘗試解決1：加charset參數，失敗

在網上搜相關信息，發現信息量很少，偶爾提到的解決方案都是加 charset參數。

譬如：

1、DB-Lib error message 20002, severity 9 - chungehpu - 博客園 (cnblogs.com)  加連接參數 charset="CP936"

2、DB-Lib error message 20002, severity 9_pymssql._pymssql.operationalerror: (20002, b'db-li-CSDN博客 也是加連接參數 charset="CP936"

3、還有github上SQL Server database encoding (GBK) is not consistent with python · Issue #820 · pymssql/pymssql · GitHub 加連接參數 charset="GBK" 

嘗試加連接參數，再次報同樣的錯誤。

嘗試解決2：切換到python3.4，成功。

切換到python3.4，不加charset寫法，結果成功。

最終解決方案：python3.6，安裝pymssql低版本（pymssql-2.1.5-cp36-cp36m-win32.whl），成功

到 Archived: Python Extension Packages for Windows - Christoph Gohlke (uci.edu) 找到pymssql 2.1.5 ，卸載原有的高版本，手工安裝whl。

成功！