In this chapter you learned about advanced concepts of exception-handling techniques. Here are some projects that will help you test the depth of your understanding.
Create the following script. Modify the script created in this section in Chapter 10 (Question 1 of the Test Your Thinking section). Raise a user -defined exception with the RAISE_APPLICATION_ERROR statement. Otherwise, display how many students there are in a section. Make sure your program is able to process all sections.
Create the following script. Try to add a record to the INSTRUCTOR table without providing values for the columns MODIFIED_BY and MODIFIED_DATE. Define an exception and associate it with the Oracle error number, so that the error generated by the INSERT statement is handled.
Modify the script created in the previous exercise. Instead of declaring a user-defined exception, add the OTHERS exception handler to the exception-handling section of the block. Then display the error number and the error message on the screen.
The projects in this section are meant to have you utilize all of the skills that you have acquired throughout this chapter. The answers to these projects can be found in Appendix D and at the companion Web site to this book, located at http://authors.phptr.com/rosenzweig3e. Visit the Web site periodically to share and discuss your answers.