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pycharm 连接数据库报错

请问出现下面报错是什么原因呢，数据库已连接，运行后就这样了

C:\Users\MACHENIKE\PycharmProjects\untitled9\venv\Scripts\python.exe C:/Users/MACHENIKE/PycharmProjects/untitled11/venv/Online-Bookstore-Management-System-master/v1.0/Book_informationUI.py
Traceback (most recent call last):
File “src\pymssql.pyx”, line 636, in pymssql.connect
File “src_mssql.pyx”, line 1964, in _mssql.connect
File “src_mssql.pyx”, line 682, in _mssql.MSSQLConnection.init
File “src_mssql.pyx”, line 1690, in _mssql.maybe_raise_MSSQLDatabaseException
_mssql.MSSQLDatabaseException: (18456, b”\xe7\x94\xa8\xe6\x88\xb7 ‘SA’ \xe7\x99\xbb\xe5\xbd\x95\xe5\xa4\xb1\xe8\xb4\xa5\xe3\x80\x82DB-Lib error message 20018, severity 14:\nGeneral SQL Server error: Check messages from the SQL Server\nDB-Lib error message 20002, severity 9:\nAdaptive Server connection failed (localhost)\nDB-Lib error message 20002, severity 9:\nAdaptive Server connection failed (localhost)\n”)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File “C:/Users/MACHENIKE/PycharmProjects/untitled11/venv/Online-Bookstore-Management-System-master/v1.0/Book_informationUI.py”, line 173, in
Book_informationUI = Book_informationUI()
File “C:/Users/MACHENIKE/PycharmProjects/untitled11/venv/Online-Bookstore-Management-System-master/v1.0/Book_informationUI.py”, line 20, in init
self.initUI()
File “C:/Users/MACHENIKE/PycharmProjects/untitled11/venv/Online-Bookstore-Management-System-master/v1.0/Book_informationUI.py”, line 24, in initUI
self.connect = pymssql.connect(server, user, password, database) # 服务器名,账户,密码,数据库名
File “src\pymssql.pyx”, line 642, in pymssql.connect
pymssql.OperationalError: (18456, b”\xe7\x94\xa8\xe6\x88\xb7 ‘SA’ \xe7\x99\xbb\xe5\xbd\x95\xe5\xa4\xb1\xe8\xb4\xa5\xe3\x80\x82DB-Lib error message 20018, severity 14:\nGeneral SQL Server error: Check messages from the SQL Server\nDB-Lib error message 20002, severity 9:\nAdaptive Server connection failed (localhost)\nDB-Lib error message 20002, severity 9:\nAdaptive Server connection failed (localhost)\n”)

Process finished with exit code 1