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mac下修改mysql的默认字符集为utf8
1,检查默认安装的mysql的字符集
mysql> show variables like '%char%';+--------------------------+--------------------------------------------------------+| Variable_name | Value |+--------------------------+--------------------------------------------------------+| character_set_client | utf8 || character_set_connection | utf8 || character_set_database | latin1 || character_set_filesystem | binary || character_set_results | utf8 || character_set_server | latin1 || character_set_system | utf8 || character_sets_dir | /usr/local/mysql-5.5.23-osx10.6-x86_64/share/charsets/ |+--------------------------+--------------------------------------------------------+8 rows in set (0.00 sec)
character_set_database和character_set_server依然是latin1的字符集,也就是说mysql后续创建的表都是latin1字符集的,不是utf8,会造成一些麻烦。所以有必要修改my.cnf,在修改my.cnf之前一定要关闭mysql进程,不然会遇到mysql的sock不能连接的问题。
2,关闭mysqld后台进程
系统偏好设置里面控制mysqld,避免了去找mysqld安装位置的麻烦。
点击 Stop MySQL Server
3,修改mysql配置文件/etc/my.cnf
sudo cp /usr/local/mysql/support-files/my-medium.cnf /etc/my.cnfsudo vi /etc/my.cnf[client]部分加入:default-character-set=utf8[mysqld]部分加入:character-set-server=utf8
退出并保存:
按住ctrl键再连按两次z键
修改完毕之后再启动mysql
4,检查结果:
mysql> show variables like '%char%';+--------------------------+--------------------------------------------------------+| Variable_name | Value |+--------------------------+--------------------------------------------------------+| character_set_client | utf8 || character_set_connection | utf8 || character_set_database | utf8 || character_set_filesystem | binary || character_set_results | utf8 || character_set_server | utf8 || character_set_system | utf8 || character_sets_dir | /usr/local/mysql-5.5.23-osx10.6-x86_64/share/charsets/ |+--------------------------+--------------------------------------------------------+8 rows in set (0.00 sec)修改完毕#
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本篇文章给大家带来了关于mysql的相关知识,其中主要介绍了关于架构原理的相关内容,MySQL Server架构自顶向下大致可以分网络连接层、服务层、存储引擎层和系统文件层,下面一起来看一下,希望对大家有帮助。

mysql的msi与zip版本的区别:1、zip包含的安装程序是一种主动安装,而msi包含的是被installer所用的安装文件以提交请求的方式安装;2、zip是一种数据压缩和文档存储的文件格式,msi是微软格式的安装包。

方法:1、利用right函数,语法为“update 表名 set 指定字段 = right(指定字段, length(指定字段)-1)...”;2、利用substring函数,语法为“select substring(指定字段,2)..”。

在mysql中,可以利用char()和REPLACE()函数来替换换行符;REPLACE()函数可以用新字符串替换列中的换行符,而换行符可使用“char(13)”来表示,语法为“replace(字段名,char(13),'新字符串') ”。

本篇文章给大家带来了关于mysql的相关知识,其中主要介绍了关于MySQL复制技术的相关问题,包括了异步复制、半同步复制等等内容,下面一起来看一下,希望对大家有帮助。

转换方法:1、利用cast函数,语法“select * from 表名 order by cast(字段名 as SIGNED)”;2、利用“select * from 表名 order by CONVERT(字段名,SIGNED)”语句。

在mysql中,可以利用REGEXP运算符判断数据是否是数字类型,语法为“String REGEXP '[^0-9.]'”;该运算符是正则表达式的缩写,若数据字符中含有数字时,返回的结果是true,反之返回的结果是false。

在mysql中,可利用“ALTER TABLE 表名 DROP INDEX unique key名”语句来删除unique key;ALTER TABLE语句用于对数据进行添加、删除或修改操作,DROP INDEX语句用于表示删除约束操作。


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