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程序运行错误提示：
org.springframework.dao.TransientDataAccessResourceException:
### Error updating database. Cause: com.mysql.jdbc.PacketTooBigException: Packet for query is too large (1482 > 1024). You can change this value on the server by setting the max_allowed_packet‘ variable.
### The error may involve com.rlglsys.mapper.IRlgl010106Mapper.updateUnit-Inline
### The error occurred while setting parameters
### SQL: UPDATE m_tb04_unit SET unit_own =?, earnings_nature =? , unit_manage_scale =? , unit_manage_scale_tow=?, unit_manage_scale_nm=?, unit_economic_type =?, unit_nature =?, unit_nature_tow =?, unit_level =? , industry_plan =?, agency_level =?, agency_level_tow =? , agency_level_three =? , unit_scale =?, license_no =?, establishment_num =?, organization_no =? , organization_code =? , unit_address =?, offical_scope =?, unit_pro =? , hospital_grade =? , hospital_grade_tow =? , unit_img =? , area_id =? , unit_lower =? , system_sort =? , industry_divide =? , system_sort_two =? , industry_divide_two =? , agency_plan =? , ex_key = ?, del_kbn = ?, expend_01 = ?, expend_02 = ?, expend_03 = ?, expend_04 = ?, expend_05 = ?, login_user_id = ?, login_date = ?, update_user_id = ?, update_date = ? WHERE unit_no = ?;
### Cause: com.mysql.jdbc.PacketTooBigException: Packet for query is too large (1482 > 1024). You can change this value on the server by setting the max_allowed_packet‘ variable.
; SQL []; Packet for query is too large (1482 > 1024). You can change this value on the server by setting the max_allowed_packet‘ variable.; nested exception is com.mysql.jdbc.PacketTooBigException: Packet for query is too large (1482 > 1024). You can change this value on the server by setting the max_allowed_packet‘ variable.
解决方案：
在linux命令栏中：输入：whereis mysql
可以显示mysql的安装目录： /usr/share/mysql
1.找到 【my-default.cnf】文件：把max_allowed_packet = 20M 的值调大些即可。
2.在etc/my.cnf文件中，找到max_allowed_packet设置，默认是1MB，我们可以修改为10MB或者20MB，随意。然后重启网站环境之后再导入数据库命令执行，就可以完全的执行导入数据库。
重新启动mysql：service mysql restart
通过 ps -el | grep mysqld 查看mysql的启动情况。
通过此语句查看mysql中max_allowed_packet的大小：
show VARIABLES like ‘%max_allowed_packet%‘;
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原文地址：http://www.cnblogs.com/hanxf/p/4441522.html
