1. 故障描述一个服务接口突然报数据库连接异常，错误信息如下：2022-12-30-15-10 [qtp503642634-1677050] [com.itcoder.services.SignService] [ERROR] - checkCertAuthority:nested exception is org.apache.ibatis.exceptions.PersistenceException: ### Error querying database. Cause: org.springframework.jdbc.CannotGetJdbcConnectionE ......
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