[Vince]

I would not. Stop dwelling in the past.

pawn Код:

new query[128];
mysql_format(connection, query, sizeof(query), "SELECT accountid FROM ... WHERE ...", variables);
mysql_tquery(connection, query, "MyCallback", "d", playerid);

// ---

forward MyCallback(playerid);

public MyCallback(playerid)
{
    if(cache_get_row_count(connection))
    {
        new accountid = cache_get_row_int(0, 0, connection); // row 0, column 0
    }
}

That is the very basic structure you'll need. You can use cache_get_field_content_int to fetch the result by name if you so desire, but it is faster to load it by its numeric position in the result.