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(3 row(s) affected) The UPDATE statement in the next excerpt does depend on referential integrity and the CASCADE keyword following the ON UPDATE phrase in the CREATE TABLE statement for ClassGrades. This is because the UPDATE statement revises a ClassID column value in the Classes table, and the ClassID column is also referenced by the FOREIGN KEY constraint in the CREATE TABLE statement for ClassGrades. Without special settings, a FOREIGN KEY constraint blocks changes to ClassID in the primary table that affects rows in the secondary table. However, the ON UPDATE phrase followed by the CASCADE keyword in the REFERENCES clause for ClassID does the following: Permits the update Enables the changes in the Classes table to propagate to the ClassGrades table SELECT * FROM Classes GO UPDATE Classes SET ClassID = 998 WHERE ClassID = 999 GO SELECT * FROM Classes GO SELECT CG.StudentID, C.ClassTitle, CG.GradeLetter FROM Classes C, ClassGrades CG WHERE C.ClassID = CG.ClassID GO The next listing shows the output from running the preceding script. This output assumes that you are running the inserts and updates sequentially as described in this section. The SELECT statements from the Classes table show the Classes table before and after the update to the ClassID column value for the row with an initial ClassID column value of 999. After the update, the ClassID column value switches successfully from 999 to 998. If this change did not propagate to the ClassGrades table, the concluding SELECT statement that joins the Classes and ClassGrades table would fail for one row in ClassGrades because ClassGrades would have a ClassID value of 999 that did not exist in Classes.

simple-case solutions and it can t handle complicated cases. That s entirely untrue. While SQL is useful for highly customized database queries, most Rails projects rarely need to touch SQL, thanks to some clever tricks in Active Record.

In this chapter you ve learned how to set up a network connection. First, we explored how an IP address is assigned to a network interface card. We covered IPv4 addresses as well as IPv6 addresses. Following that, you read how to troubleshoot a network connection using basic commands such as ping and traceroute, or advanced tools like nmap and Wireshark. In the last part of this section, you ve learned how to create a remote session with SSH. In the next chapter, you ll find out how to set up networking services like NTP, DHCP, and DNS on your server.

ClassID ----------1 999

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The primary way in which we enhance models is by adding methods to them. This is what s referred to as adding domain logic. With Active Record, all the logic for a particular table is contained in one place: the model. This is why the model is said to encapsulate all the domain logic. This logic includes access rules, validations, relationships, and, well, just about anything else you feel like adding. In addition to all the column-based reader and writer methods you get by wrapping a table, you re free to define your own methods on the class. In fact, an Active Record subclass isn t much different from a regular Ruby class. About the only difference is that you need to make sure you don t unintentionally overwrite any of Active Record s methods (find, save, or destroy, for example). For the most part, though, this isn t a problem. Let s look at a simple example. We re often faced with the problem of having to format data, rather than accessing a model attribute in its raw form. In our events application, we would like to be able to produce a formatted, long title that includes the name of the event, its location, and its date. To accomplish this, all we need to do is define a new instance method that performs the concatenation of those attributes and produces a formatted string. We ll call the method long_title. Add the code shown in Listing 5-1 just before the last end statement in the app/models/event.rb file.

(2 row(s) affected)

inux servers are often used to configure services that help make networking happen. These include DNS for name resolution, DHCP for IP address configuration, and NTP for time services. In this chapter, you ll read how to configure them. You ll also read how to enable some common Linux services using xinetd.

class Event < ActiveRecord::Base #... def long_title "#{title} - #{location} - #{occurs_on}" end end

(1 row(s) affected) ClassID ----------1 998 ClassTitle --------------------------Learning SQL Server Express The Life of Jesus Christ

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