无法使用mysql_real_connect（）连接到mysql服务器

Question

I can't connect to MySQL remote server with this code:

MYSQL conn;
bool con_to_db()
{
     conn = mysql_init(0);
     conn =mysql_real_connect(conn, host, user, pass, 0, NULL, 0);
     if(conn)
        //cout<<"connection to atestat databse successful "<<endl;
        return true;
     else
       // cout<<"connection problem: "<<mysql_error(conn)<<endl;
       return false;
}

int main()
{
   if(con_to_db())
     cout<<"connection to atestat databse successful "<<endl;
   else 
      cout<<"connection problem: "<<mysql_error(conn)<<endl;
}

after running this code there is a message in the console:

connection failure

Answer 1

At the first line of your code MYSQL conn . This is the prototype for mysql_real_connect:

MYSQL * mysql_real_connect(MYSQL * mysql,
                       const char * host,
                       const char * user,
                       const char * passwd,
                       const char * db,
                       unsigned int port,
                       const char * unix_socket,
                       unsigned long flags); 

conn should be a pointer.