文章详细的介绍了解决mysql的默认字符编码和中文乱码问题 ,有需要了解的朋友可参考一下。
MySQL的默认编码是Latin1,不支持中文,那么如何修改MySQL的默认编码呢,下面以UTF-8为例来说明
启动mysql后,以root登录mysql
mysql > show variables like 'character%'; #执行编码显示
+--------------------------+----------------------------+
| Variable_name | Value |
+--------------------------+----------------------------+
| character_set_client | latin1 |
| character_set_connection | latin1 |
| character_set_database | latin1 |
| character_set_filesystem | binary |
| character_set_results | latin1 |
| character_set_server | latin1 |
| character_set_system | utf8 |
| character_sets_dir | /usr/share/mysql/charsets/ |
+--------------------------+----------------------------+
这是安装后,默认的字符编码(图为Solaris下的截图,windows的类似)
需要注意的是,要修改的地方非常多,相应的修改方法也很多。下面是一种最简单最彻底的方法:
一、Windows
1、中止MySQL服务
2、在MySQL的安装目录下找到my.ini,如果没有就把my-medium.ini复制为一个my.ini即可
3、打开my.ini以后,在[client]和[mysqld]下面均加上default-character-set=utf8,保存并关闭
4、启动MySQL服务
二、Linux
1、中止MySQL服务(bin/mysqladmin -u root shutdown -p)
2、在/etc/下找到my.cnf,如果没有就把MySQL的安装目录下的support-files目录下的my-large.cnf复制到/etc/下并改名为my.cnf即可
3、打开my.cnf以后,修改以下,保存并关闭
找到客户端配置[client] 在下面添加
default-character-set=utf8 默认字符集为utf8
在找到[mysqld] 添加
default-character-set=utf8 默认字符集为utf8
init_connect='SET NAMES utf8' (设定连接mysql时使用utf8编码,以让mysql数据库为utf8运行)
4、启动MySQL服务(bin/mysqld_safe &),重新查看编码显示
mysql > show variables like 'character%'; #执行编码显示
+--------------------------+----------------------------+
| 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/share/mysql/charsets/ |
+--------------------------+----------------------------+
修改后的编码显示(图为Solaris下的截图,windows的类似)
非常简单,这样的修改一劳永逸,今后MySQL一切相关的默认编码均为UTF-8了,创建新表格的时候无需再次设置

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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') ”。

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。

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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。

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