C语言连接mysql -insert-update

C语言连接mysql数据库实现insert语句：
数据库：test
表：systeminfo

CREATE TABLE `systeminfo` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `ip_info` varchar(50) NOT NULL,     
  `serv_info` varchar(50) NOT NULL,    
  `cpu_info` varchar(50) NOT NULL,    
  `disk_info` varchar(50) NOT NULL,    
  `mem_info` varchar(50) NOT NULL,    
  `load_info` varchar(50) NOT NULL,    
  `mark_info` varchar(50) NOT NULL,    
  PRIMARY KEY (`id`),
  UNIQUE KEY `ip_info` (`ip_info`),
  UNIQUE KEY `ip_info_2` (`ip_info`)
);

 /* insert.c */
 #include <stdio.h>
 #include <stdlib.h>
 #include "/usr/include/mysql/mysql.h"
 /*注意哦，上面必须是mysql.h的绝对地址，一般在mysql下的include目录下，仔细看看你的在哪里？*/

 int main(int argc, char *argv[])
 {
     MYSQL my_connection;
     int res;
     mysql_init(&my_connection);

     /*mysql_real_connect(&mysql,host,user,passwd,dbname,0,NULL,0) == NULL)*/
     ,NULL,CLIENT_FOUND_ROWS))
     {
         printf("Connection successn");
         res = mysql_query(&my_connection, "insert into systeminfo values(null,'y1','y2','y3','y4','y5','y6','y7');");
         if (!res)
         {
             printf("Inserted %lu rowsn",(unsigned long)mysql_affected_rows(&my_connection));
             /*里头的函数返回受表中影响的行数*/
         }
         else
         {
             //分别打印出错误代码及详细信息
             fprintf(stderr, "Insert error %d: %sn",mysql_errno(&my_connection),mysql_error(&my_connection));
         }
         mysql_close(&my_connection);
     }
     else
     {
         fprintf(stderr, "Connection failedn");
         if (mysql_errno(&my_connection))
         {
             fprintf(stderr, "Connection error %d: %sn",mysql_errno(&my_connection),mysql_error(&my_connection));
         }
     }
 } 

insert.c

编译时添加-L/usr/lib64/mysql -lmysqlclient 参数
    #  gcc insert.c -L/usr/lib64/mysql -lmysqlclient -o insert

更新语句时即可以将insert语句改为update。
        res = mysql_query(&my_connection, "update systeminfo set sex='男' where id<5 ");