C函数操作mysql5插入数据乱码（已经设置了字符集为utf8）！
已经修改了/etc/my.cnf文件，并在终端查询设置：mysql> show variables like 'collation_%';
+----------------------+-----------------+
| Variable_name | Value |
+----------------------+-----------------+
| collation_connection | utf8_general_ci |
| collation_database | utf8_general_ci |
| collation_server | utf8_general_ci |
+----------------------+-----------------+
3 rows in set (0.00 sec)
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/share/mysql/charsets/ |
+--------------------------+----------------------------+
8 rows in set (0.00 sec)
说明字符集设置成功了。在终端里插入中文可以显示，但程序里面通过C函数插入始终是乱码。
最后在连接数据库后加入 mysql_query(mysql,"SET NAMES utf8");成功。但问题出来了，在网上搜寻SET NAMES utf8就是设置字符集的作用，但我已经修改my.cnf，为什么还要在程序里面调用SET NAMES utf8来设置字符集。mysql的版本5.0.45
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