服务器未知运行时异常: 
### Error querying database.  Cause: com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failure

The last packet successfully received from the server was 1,687 milliseconds ago.  The last packet sent successfully to the server was 1,779 milliseconds ago.
### The error may exist in file [D:\code\xuzhou\casic-metering\casic-metering-dao\target\classes\mapper\business\BusinessCertificateReportMapper.xml]
### The error may involve defaultParameterMap
### The error occurred while setting parameters
### SQL: SELECT             bcr.*,             csi.sample_no AS sampleNo,             csi.sample_name AS sampleName,             csi.sample_model AS sampleModel,             csi.manufacturing_no AS manufacturingNo,             bo.order_code AS orderCode,             su.name AS measurePersonName,             csi.measure_category AS measureCategory         FROM business_certificate_report bcr             LEFT JOIN business_order bo             ON bcr.order_id=bo.id             LEFT JOIN customer_sample_info csi             ON bcr.sample_id=csi.id             LEFT JOIN sys_user su             ON bcr.measure_person_id=su.id         WHERE bcr.is_del = 0                                                                                                                        and bcr.id in                      (                           ?                      ) LIMIT ?
### Cause: com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failure

The last packet successfully received from the server was 1,687 milliseconds ago.  The last packet sent successfully to the server was 1,779 milliseconds ago.
; Communications link failure

The last packet successfully received from the server was 1,687 milliseconds ago.  The last packet sent successfully to the server was 1,779 milliseconds ago.; nested exception is com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failure

The last packet successfully received from the server was 1,687 milliseconds ago.  The last packet sent successfully to the server was 1,779 milliseconds ago.