mysql5.6设置sql_mode方法详解

本文章来给大家介绍一下mysql5.6设置sql_mode方法详解,希望此方法对各位同学会有所帮助.

首先登录mysql终端,代码如下:mysql -u xxx -pxxxxx

查看当前mysql的sql_mode,代码如下:

1. mysql>select@@sql_mode;
2. +--------------------------------------------+
3. |@@sql_mode|
4. +--------------------------------------------+
5. |STRICT_TRANS_TABLES,NO_ENGINE_SUBSTITUTION|
6. +--------------------------------------------+

将mysql的sql_mode 设为 MYSQL40 也就是 NO_FIELD_OPTIONS,HIGH_NOT_PRECEDENCE,代码如下:

1. mysql>SETsql_mode=`NO_FIELD_OPTIONS,HIGH_NOT_PRECEDENCE`;
2. QueryOK,0rowsaffected(0.00sec)
4. mysql>select@@sql_mode;
5. +--------------------------------------+
6. |@@sql_mode|
7. +--------------------------------------+
8. |NO_FIELD_OPTIONS,HIGH_NOT_PRECEDENCE|
9. +--------------------------------------+
10. 1rowinset(0.00sec)

需要注意的是上面的修改 sql_mode 只是会话级别的,只影响当前会话,退出终端后既失效.

下面这个才是设置全局级别的变量,适用于所有会话,但仅限于本次mysql进程,下次重启还要重新设置,代码如下:

set global sql_mode=`NO_FIELD_OPTIONS,HIGH_NOT_PRECEDENCE`

详细用法,代码如下:SET [GLOBAL|SESSION] sql_mode='modes'

每次启动自动设置sql_mode可以在启动脚本里面加上,代码如下:

mysql --sql-mode="NO_FIELD_OPTIONS,HIGH_NOT_PRECEDENCE"

sql_mode默认设置问题:

编译并配置完MySQL5.6版本,导入之前在MySQL5.5中正常运行的数据库却发生错误,原来从MySQL5.6版本开始,在执行mysql_install_db命令时,该命令一般在编译完mysql后运行并对数据库进行初始配置,会将默认的一个my.cnf文件写入到安装路径中(CentOS下默认安装路径为/usr/local/mysql/）,其包含的信息如下:

1. #Foradviceonhowtochangesettingspleasesee
2. #http://dev.mysql.com/doc/refman/5.6/en/server-configuration-defaults.html
3. [mysqld]
4. #Removeleading#andsettotheamountofRAMforthemostimportantdata
5. #cacheinMySQL.Startat70%oftotalRAMfordedicatedserver,else10%.
6. #innodb_buffer_pool_size=128M
7. #Removeleading#toturnonaveryimportantdataintegrityoption:logging
8. #changestothebinarylogbetweenbackups.
9. #log_bin
10. #Thesearecommonlyset,removethe#andsetasrequired.
11. #basedir=.....//phpfensi.com
12. #datadir=.....
13. #port=.....
14. #server_id=.....
15. #socket=.....
16. #Removeleading#tosetoptionsmainlyusefulforreportingservers.
17. #TheserverdefaultsarefasterfortransactionsandfastSELECTs.
18. #Adjustsizesasneeded,experimenttofindtheoptimalvalues.
19. #join_buffer_size=128M
20. #sort_buffer_size=2M
21. #read_rnd_buffer_size=2M
22. #作者按:见这里的配置
23. sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES