MySQL max_allowed_packet错误解决

MySQL查询报错：

### Error querying database. Cause: com.mysql.cj.jdbc.exceptions.PacketTooBigException: Packet for query is too large (2,482 > 2,048). You can change this value on the server by setting the 'max_allowed_packet' variable. ### The error may exist in class path resource [mapper/system/SysBizProcessResultLogMapper.xml] ### The error may involve defaultParameterMap ### The error occurred while setting parameters ### SQL: select count(*) from sys_biz_process_result_log WHERE dept_id in ( ? , ? , ? , ? , ? , ? , ? , ? , ? , ? , ? , ? , ? , ? , ? , ? , ? , ? , ? , ? , ? , ? , ? , ? , ? , ? , ? , ? , ? , ? , ? , ? , ? , ? , ? , ? ) and biz_type in ( ? , ? , ? , ? , ? , ? , ? , ? , ? , ? , ? , ? , ? , ? ) and start_time >= ? and over_time <= ? ### Cause: com.mysql.cj.jdbc.exceptions.PacketTooBigException: Packet for query is too large (2,482 > 2,048). You can change this value on the server by setting the 'max_allowed_packet' variable. ; Packet for query is too large (2,482 > 2,048). You can change this value on the server by setting the 'max_allowed_packet' variable.; nested exception is com.mysql.cj.jdbc.exceptions.PacketTooBigException: Packet for query is too large (2,482 > 2,048). You can change this value on the server by setting the 'max_allowed_packet' variable.

解决方法：设置max_allowed_packet

set global max_allowed_packet = 67108864;

除此之外，比如在Windows下，my.ini文件配置了max_allowed_packet=100M，那么你可能需要将此值进行修改。

参考：

1. How to change max_allowed_packet size