Checking if a store is open. MySQL node.js Business Logic

JD333 :

given a users time, I am trying to figure out whether a store is open or closed.

My HoursOfOperation DB looks like this:

dayid | openTime | closeTime
  3       1500      2400
  4       1500      2400
  5       1500       100
  6       1500       200

dayid is sunday - saturday: 0-6 respectively.

openTime and closeTime range between 0-2400.

If the user time is say 1800 on a wednesday, that's easy. The place is open. But what if it's 1AM on a saturday? The greater than openTime returns false, and the less than closeTime check is true. false && true equals false.

I've tried multiple types of data and business logic. But I'm struggling to wrap my head around this. What am I missing?

Gordon Linoff :

You can use logic like this:

where dayid = @dayid and
      ( (openTime < closeTime and @timetocheck between openTime and closeTime) or
        (openTime > closeTime and @timetocheck not between closeTime and openTime)
      )

The logic reads as:

• If openTime is less then closeTime, then the store is open when the requested time is between them.
• If openTime is greater than closeTime, then typically closeTime would be in the wee hours of the morning. The store is closed between the closeTime and openTime. Hence, the store is open at other times.

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