【MySql】數據庫鏈接異常：The last packet sent successfully to the server was 0 milliseconds ago

使用數據庫瀏覽工具 或 程序 鏈接mysql數據庫遇到異常：java The last packet sent successfully to the server was 0 milliseconds ago mysql com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure Th

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