根据当前时间从数据库中获取数据

Question

So I am fetching data from my PostgreSQL data by executing a query in my Index.php. This query fetches the name of the bus station name along with the corresponding time it will be arriving. What I want my application to do is fetch times for a specific bus station selected based on the current time.

My query is the following:

   $query = " SELECT busname, bustime
              From busses
             where name = '$name' and time ='$time' LIMIT 5";

Would I need to do something in my query to achieve this or in my database ?

Answer 1

If you are basing it of current time you definitely don't want time='$time' as this will only ring true if you happen to be querying at the exact time down to the millisecond.

Presuming you are wanting to get all (or closest) times for a bus station based on current time then try:

$query = " SELECT busname, bustime
           From busses
           WHERE name = '$name' 
           AND time >= '$time'  
           ORDER BY time ASC 
           LIMIT 5";

This will give you all times after current time and then ordering by ASC will give the nearest time first, limiting 5 then returns only the next 5 bus times.