c实现的连接MYSQL数据库

#include <stdio.h>
#include <mysql.h>

#define host;
#define user_name;
#define passwd;
#define db_name;

MYSQL *connect;

main()
{
connect=mysql_init(NULL);
mysql_real_connect(connect,host,user_name,passwd,db_name,0,NULL,0);
mysql_close(NULL);
exit(0);
}