【MySQL】PacketTooBigException: Packet for query is too large.

Question

　　批量插入1万条数据，抛出PacketTooBigException异常，错误信息如下：

Caused by: com.mysql.jdbc.PacketTooBigException: Packet for query is too large (8751423 > 4194304). 
            You can change this value on the server by setting the max_allowed_packet' variable.

Solution

　　查看允许最大值：

mysql> show variables like 'max_allowed_packet';
+--------------------------+------------+
| Variable_name            | Value      |
+--------------------------+------------+
| max_allowed_packet       | 4194304    |
+--------------------------+------------+
2 rows in set

　　重新设置最大值：在my.cnf文件的［mysqld］后添加键值对：max_allowed_packet = 12M，重启MySQL。