Packet for query is too large(mysql写入数据过大)

错误现象：(com.logicaldoc.core.security.dao.HibernateUserDAO: 102) -- Packet for query is too large (1086 > 1024). You can change this value on the server by setting the max_allowed_packet' variable.
org.hibernate.exception.GenericJDBCException: Packet for query is too large (1086 > 1024). You can change this value on the server by setting the max_allowed_packet' variable.
解决办法：MySQL的一个系统参数：max_allowed_packet，其默认值为1048576(1M)，
查询：show VARIABLES like '%max_allowed_packet%';
修改此变量的值：my.cnf文件中的[mysqld]段中的＂max_allowed_packet = 1M＂，(可能有些文件会没有这一行的)格式为：[mysqld]max_allowed_packet = 1M （ 将1M更改为4M(如果没有这行内容，增加一行))，保存，重起MySQL服务。现在可以load大于1M的文件了