官网中关于ORA-12560的解释：
ORA-12560: TNS:protocol adapter error
Cause: A generic protocol adapter error occurred.
Action: Check addresses used for proper protocol specification. Before reporting this error, look at the error stack and check for lower level transport errors. For further details, turn on tracing and reexecute the operation. Turn off tracing when the operation is complete.
首先检查windows服务中Oracle实例相关服务是否运行：
WIN（图标键）+R
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