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请求出现异常,异常类型:【org.springframework.dao.RecoverableDataAccessException】,
异常信息:【PreparedStatementCallback; SQL [SELECT * FROM prd_category WHERE id = ?]; Communications link failure
The last packet successfully received from the server was 638,600 milliseconds ago. The last packet sent successfully to the server was 1 milliseconds ago.; nested exception is com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
The last packet successfully received from the server was 638,600 milliseconds ago. The last packet sent successfully to the server was 1 milliseconds ago.】