1.问题
报错：dataGrip java.net.ConnectException: Connection refused: connect.
详细错误：[08S01]
Communications link failure
The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
Communications link failure
The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
2.原因
mysql57服务并未开启，开启后连接成功
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