今天在source mysqldump 备份文件时，发现导入的过程中报如下的错误：
ERROR 1231 (42000): Variable ‘time_zone‘ can‘t be set to the value of ‘NULL‘
ERROR 1231 (42000): Variable ‘sql_mode‘ can‘t be set to the value of ‘NULL‘
ERROR 1231 (42000): Variable ‘foreign_key_checks‘ can‘t be set to the value of ‘NULL‘
ERROR 1231 (42000): Variable ‘unique_checks‘ can‘t be set to the value of ‘NULL‘
ERROR 1231 (42000): Variable ‘character_set_client‘ can‘t be set to the value of ‘NULL‘
ERROR 1231 (42000): Variable ‘collation_connection‘ can‘t be set to the value of ‘NULL‘
ERROR 1231 (42000): Variable ‘sql_notes‘ can‘t be set to the value of ‘NULL‘
解决方法：
mysql> set max_allowed_packet=1024M; --只对当前会话生效
mysql> source ./xxxx.sql;
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MySQL 执行SQL脚本 报ERROR 1231 (42000)的解放办法
原文：http://395469372.blog.51cto.com/1150982/1729451