当我尝试连接到oracle时发现此错误
ORA-12560：TNS：协议适配器错误
C:\Users\Mike Reze>sqlplus sys as sysdba
SQL*Plus: Release 12.1.0.2.0 Production on Fri Mar 1 14:57:38 2019
Copyright (c) 1982, 2014, Oracle. All rights reserved.
Enter password:
ERROR:
ORA-12560: TNS:protocol adapter error