Hook to return true when the_post() is used in a custom while loop

Question

I fetch external data like this, but I also added the_post();

while($slice = mysql_fetch_assoc($result)){
    the_post();
    rest of my stuff
}

I need a hook to tell me if the_post() returns true, something like this:

while($slice = mysql_fetch_assoc($result)){
    the_post();
    if(the post returs true){ do something;
    else { rest of my stuff }
}

Any ideas?

Answer 1

if you use the native wp_query to select posts instead of custom sql queries you can check against the have_posts() method of wp_query