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atabase objects that encapsulate T-SQL code make that code easier to reuse. This is an important technique because it lets you multiply the benefits of your investments in T-SQL code development. You will therefore find it more worthwhile to create solutions with T-SQL when you encapsulate your code in database objects. SQL Server Express offers four database objects for packaging T-SQL code: Views User-defined functions Stored procedures Triggers This chapter examines techniques for creating, managing, and referencing each of these four types of objects. You can leverage that is, reuse database objects by 1. Creating a database object with the code that you want to reuse 2. Referencing the database object in one or more other code blocks Database object types distinguish themselves by the roles that they can play in a database solution. One goal of this chapter is to characterize the database objects in terms of the benefits that they bring to a solution. The skills that you gain in this chapter will motivate you to create and apply database objects in your custom database solutions.

To specify conditions, you can pass in a SQL fragment as a string that is sent directly to the query. You need to have a pretty decent knowledge of SQL to use this kind of syntax, but it does provide a lot of flexibility, and you can create arbitrarily complex SQL fragments if you re a SQL-ninja. Let s try the same find operation as in the previous section, but using a pure SQL condition fragment.

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Views are virtual tables. That is, a view can represent a set of rows like a table. However, a view is not actually a table. Instead, a view is a SELECT statement that performs data access, such as many of the T-SQL code samples in s 5 and 6. The difference between a SELECT statement and a view is that a view encapsulates a SELECT statement as an object in a database. You can make a new view with a CREATE VIEW statement similarly to the way that you make a table with a CREATE TABLE statement. A CREATE VIEW statement contains a SELECT statement defining the rowset that a view represents, while a CREATE TABLE statement contains specifications for columns and constraints (see 4 for more detail on creating tables). You can drop and modify views with the DROP VIEW and ALTER VIEW statements. A SELECT statement in a database object, such as a view, is more readily reusable than a SELECT statement in a .sql file.

>> Event.find(:all, :conditions => "occurs_on = '2007-09-02'") => [#<Event:0xb73f63b4 @attributes={..."occurs_on"=>"2007-09-02"...}>]

There are two methods to start services. First, you can fire up the service when your system boots, in which case the service occupies its port and waits for incoming connections all the time. But, if the service is needed only occasionally, starting it at system boot and keeping it available all the time is a waste of system resources. This is exactly when the second method is preferred: the xinetd process (and its predecessor inetd) were developed to listen on behalf of other processes to see if a connection comes in. If it does, xinetd starts the process, thus making optimal use of system resources. In this section you ll learn how to configure it.

You can reference a view in the FROM clause of a SELECT statement because a view is a database object that acts like a virtual table. This capability to be referenced in a FROM clause dramatically enhances accessibility to the filtering, ordering, and aggregating features of a SELECT statement relative to a SELECT statement in a .sql file. You can also change a view s underlying data sources by referring to the view in the same way that you do a table in INSERT, UPDATE, and DELETE statements. If a view s concluding clause is WITH CHECK OPTION, you can force INSERT and UPDATE statements that reference the view to conform to criteria within a view s SELECT statement.

Event.find( :all, :conditions => "occurs_on < '23-03-2007' OR location NOT LIKE '%Hampton%'" )

You can use constraints within a table s definition instead of the WITH CHECK OPTION in a view. If more than one view references the same table, using a constraint within a table s definition represents a more consistent technique for forcing inserts and updates to adhere to constraints.

Note On Ubuntu Server, xinetd is not installed by default. Instead, the legacy inetd service is available. Because xinetd offers the same capabilities but with much more flexibility, I m covering just xinetd in this section. Make sure that you have it installed by using apt-get install xinetd.

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