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Devel::REPL is an interactive shell for Perl REPL stands for read, evaluate, print, loop It can be used with Catalyst as an alternative to the Perl debugger However, because Catalyst does a lot of error trapping behind the scenes, we use the CPAN module CatalystX::REPL to make debugging our Catalyst application straightforward First, we install CatalystX::REPL from CPAN To make use of CatalystX::REPL, which is another Moose role, we need to modify the use parent 'Catalyst' line in MyApppm with the following: use Moose; extends 'Catalyst'; with 'CatalystX::REPL'; use namespace::autoclean; To demonstrate the usage of Devel::REPL, we can then place a die statement in our code We ll put this line after the my ($self, $c) = @_; line in the index sub in MyApp::Controller:: Root: die "ERROR!"; Next, we run the development server with the CATALYST_REPL environment variable set to true: $ CATALYST_REPL=1 script/myapp_server.

11. Provide the name and initials of all employees who have ever attended a course taught by N. Smith. Hint: Use subqueries, and work inside out toward the result; that is, retrieve the employee number of N. Smith, search for the codes of all courses he ever taught, and so on. Solution 4-11. SQL> select ename, init 2 from employees 3 where empno in 4 (select attendee 5 from registrations 6 where (course, begindate) in

Depending on how a Concordance database is designed, once data is loaded, it might not be immediately available to Concordance s search facilities. Usually, a process known as indexing is required. Indexing is applied to two types of fields in a Concordance database: fields that have been designated with a PARAGRAPH data type, or fields of other data types for which the indexed attribute has been set to True. Any field that has a PARAGRAPH data type is indexed by default, although fields that have other data types are indexed only if you specify that the field should be indexed.

pl Now when we request http://localhost:3000, the page appears to load and then gets stuck Over in our shell, we get a rather long stack trace and a prompt In the prompt, we can examine data Devel::REPL just prints out data if we type it in It will return either an exception for bits of data that don t exist or just an empty string Here s an example session from an application: $ CATALYST_REPL=1 script/myapp_serverpl [output snipped] You can connect to your server at http://fenchurchlocal:3000 Then we pop over to our browser and request the application home page, and in our terminal we get the following output: Catalyst::run('MyApp', 3000, undef, 'HASH(0x801764)') called at script/myapp_server.

(select course, begindate from offerings where trainer = (select empno from employees where ename = 'SMITH' and init = 'N' ) ) ); INIT ----JAM R SCJ CC R MG

s Note You can toggle the Index attribute for a field using the Modify dialog, which you can access from

12. How could you redesign the EMPLOYEES table to avoid the problem that the COMM column contains null values meaning not applicable Answer: By dropping that column from the EMPLOYEES table and by creating a separate SALESREPS table, with the following rows: EMPNO COMM -------- -------7499 300 7521 500 7654 1400 7844 0 In this table, the EMPNO column is not only the primary key, but it is also a foreign key referring to the EMPLOYEES table. 13. In Section 4.9, you saw the following statement: In SQL, NOT is not not. What is this statement trying to say Answer: In three-valued logic, the NOT operator is not the complement operator anymore: NOT TRUE is equivalent with FALSE not TRUE is equivalent with FALSE OR UNKNOWN 14. Referring to the brain-twister at the end of Section 4.9, what is the explanation of the result no rows selected in Listing 4-44

pl line 57 $ It happens that while the Perl debugger has special commands like x $data, in Devel:: REPL to see the contents of some data, you just need to type the variable Let s look at $c: $ $c $MyApp1 = MyApp=HASH(0xdf24f0); $.

Answer: The following WHERE clause: 2 where evaluation not in (1,2,3,NULL)