Throwing Exceptions

We can close these two files, and we'll open our course. 0:01 The first thing we need to do is tell our course to use our new exception, use App, 0:06 \Exception\ApiException. 0:17 So for our first method, getCourses, if there are no courses, 0:30 we want to throw an exception. 0:34 We'll set this to courses. 0:41 And then we'll return courses. 0:45 Then we'll check if empty courses. 0:50 If so, we want to throw a new ApiException. 0:57 And then we can use our ApiException with 1:02 COURSE_NOT_FOUND, and 404. 1:07 Let's do the same thing for the getCourse. 1:12 Course =, and return course. 1:21 If not, we'll throw an exception. 1:29 Before we move on, let's test this out in Postman. 1:32 Line 21. 1:46 Great, we see course not found. 2:04 Let's go back and add some more exceptions. 2:08 Our next method is createCourse. 2:13 First, we should check that the proper data has been passed. 2:16 If empty data title. 2:24 Or empty data url. 2:31 Then we're going to throw a new ApiException. 2:37 And we're gonna call ApiException. 2:42 And we're going to say COURSE, 2:45 _INFO_REQUIRED. 2:52 Also, we want to check if the course has actually been added. 2:55 After the execute, we can check, If 3:00 the statement affected rowCount, 3:05 and that is less than 1. 3:13 So if nothing changed, we want to throw a new ApiException, 3:18 and then we can say ApiException, 3:24 COURSE_CREATION_FAILED. 3:31 Next is updateCourse. 3:37 We're going to do the same thing that we did for create. 3:39 So let's copy these lines here and paste them here. 3:42 We also need to check if empty data course_id. 3:48 And again, we'll need the rowCount, helps if we spell it right. 3:59 So after execute, we'll check if anything was updated. 4:06 If not, we'll throw another exception, UPDATE_FAILED. 4:10 Finally, we have our deleteCourse. 4:18 First, we want to check that our course actually exists. 4:20 So again, we can use this getCourse, and pass the course_id. 4:24 Once again, we can check that a row has been affected by our statement. 4:32 So after execute, we'll do our rowCount. 4:36 And if not, COURSE_DELETE_FAILED. 4:41 Let's check this out in Postman. 4:47 So trying to find a course that doesn't exist gives us the course not found. 4:50 If we want to add a course, but we don't pass any data, 5:02 It's giving us an error, COURSE_INFO_REQUIRED. 5:11 Missing an R. 5:15 Course, course, course. 5:18 Okay, course. 5:23 All the rest look good. 5:26 Required course data missing. 5:31 Great, and if we try to update a course, Without 5:35 any information, Required course data missing. 5:40 And if we try to delete a course that doesn't exist, Course Not Found. 5:51 This is just an example. 5:59 You can go ahead and play around a little bit more. 6:00 Your next challenge is to add exceptions in your review class. 6:03 Go ahead and give it a try and I'll show you what I did in the next step. 6:08