cplusplus connet mysql show data question - c++

Question

**``` c++ connect mysql
1.
Heading
#include <mysql/mysql.h>
#include <iostream>
#include<stdio.h>
#include <unistd.h>
using namespace std;
MYSQL *conn;MYSQL_RES *res;MYSQL_ROW row;
int main(int argc,char **argv)
{
const char *sever = "127.0.0.1"; //主机
const char *user = "root"; //用户名
const char *password = "root"; //用户密码
const char *database = "demo"; //数据库名称
conn = mysql_init(NULL);
if(!mysql_real_connect(conn,sever,user,password,database,3306,NULL,0))
{
cout << "connect error" << endl;
return 0;
}
mysql_set_character_set(conn,"utf8");
while(1==1){//where there not work
cout<<"enter while"<<endl;
sleep(2);
cout<<"link ok"<<endl;
if(mysql_query(conn,"select * from person"))
{
cout << "query error" << endl;
return 0;
}
//res = mysql_store_result(conn);
res = mysql_use_result(conn);
while((row = mysql_fetch_row(res)) != NULL)
{
cout << row[0] << '\t' << row[1] << '\t' << row[2] << '\t'
<< row[3] << '\t' << row[4] << endl;
}
cout<<"query end"<<endl;
}
mysql_free_result(res);
mysql_close(conn);
return 0;
}
```
it can show data from mysql.but why it not cycle.the while doesn't work?
i have tried many conform to explain this .but no any one can help my ,some one who can tell my why .