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Posted 27 Oct 2014Very good tutorial and explanation of the design. The ICommand interface is something I plan to implement as I do some refactoring. The entire layout of the example is very good. Kudos to you.
Posted 22 Oct 2014Interesting tutorial. I currently have a few cameras around my house and you've just opened up my appetite. I have a question though. Is it possible to reduce the motion detection's sensitivity? I won't want a tree triggering the motion detection and raising a lot of false positives. Good work by the way.
Posted 5 Aug 2014Hello there,
You should use a UNIQUE constraint and apply it on your DATETIME field. This would require you to alter the table. This works but practically I won't suggest you do. The best option is to check it manually. I don't believe appointments are going to be a minute long and the UNIQUE constraint would only account for that specific time. Plus using the UNIQUE constraint would mean that you would have to delete your appointments after they're finished in case someone else wants to book that time in the future. In my opinion your best bet would be to check it manually. An appointment or booking should have an end time also.
I haven't used MySQL in a while so forgive me if there's an error here but this is the logic
IF (SELECT 1=0 FROM YourTable WHERE `appointment_starttime` >= requested_time AND `appointment_endtime` < requested_time) THEN BEGIN INSERT INTO YourTable .................. END
This is of course a simple solution because remember bookings can overlap. It's rare you're going to have someone book the exact same time down the minute all the time. For instance someone's booking can't end in the middle of another person's booking. Nonetheless you see that you can perform IF THEN ELSE queries with MySQL.
Posted 5 Aug 2014Hello there,
This is because an implicit cast isn't being performed. You'll have to do the cast manually. Check out the Convert.ToDouble method. It has many other overloaded methods that you can use to do many conversions. Play around with the Convert class too.
The other alternative which will make your code run a lot cleaner is the Double.TryParse method. It returns a Boolean that states whether or not the conversion was done so that you can basically perform error checking.
Also don't forget to use
Posted 26 Feb 2014Well technically there's a redirect directly after your echo. Remember all PHP code is ran before anything even reaches the client/browser. Therefore PHP would have already executed the redirect thus not displaying the echo statement you have there.
Try removing the header('location ....') line to confirm that rows are actually being deleted OR pass the number of rows being deleted as a GET request to the page you're redirecting to.
header('location: index.php?result=' . $delete->affected_rows);
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