c++ linux 如何把 char* 里面的中文 insert进入mysql(相应的字段为varchar类型)

首先， show variables like 'char%';来检查字符集：

+--------------------------+----------------------------+

| Variable_name | Value |

+--------------------------+----------------------------+

| character_set_client | latin1 |

| character_set_connection | latin1 |

| character_set_database | utf8 |

| character_set_filesystem | binary |

| character_set_results | latin1 |

| character_set_server | utf8 |

| character_set_system | utf8 |

其次，修改方式有两个：

第一种，单次有效，直接在mysql命令行输入：set names 'utf8';

第二种，永久有效，在my.cnf配置：

[mysqld]

datadir=/var/lib/mysql

socket=/var/lib/mysql/mysql.sock

user=mysql

# Disabling symbolic-links is recommended to prevent assorted security risks

symbolic-links=0

default-character-set=utf8

[mysql.server]

default-character-set=utf8

[mysqld_safe]

log-error=/var/log/mysqld.log

pid-file=/var/run/mysqld/mysqld.pid

default-character-set=utf8

[client]

default-character-set=utf8

原理讲解：

mysql内部会有多次字符集的转换：

第一次mysql客户端到mysql connection的转换，第二次mysql connection到mysql server的转换；

所有上面第一张表的Variable_name经过那两种配置方式后，就变成了：

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 |