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This chapter systematically reviewed the key SELECT statement clauses for implementing data access. These clauses include FROM, WHERE, GROUP BY, HAVING, and ORDER BY. You saw how to use these clauses together with SELECT list items to format the result sets generated by running SELECT statements. In the process of reviewing SELECT statement clauses, the chapter demonstrated numerous techniques, such as how to take advantage of traditional and innovative features for the TOP keyword, as well as how to format and process date and time values. A central theme of this chapter was how to generate result sets from a single database object. That restriction still leaves substantial flexibility in the sources of data for a SELECT statement. If you need a column not provided by any single table, you may be able to specify calculated column values that meet your requirement. If that does not work, you may find the column you need in a view within the current database context that a USE keyword designates. If that does not work, you may be able to extract the values you seek from a database object in another database on the same server. Finally, you can resort to retrieving values from database objects on other database server instances connected via an OPENROWSET function or a linked server. The next chapter will include coverage of techniques for concurrently retrieving data from multiple database objects, as well as other advanced data access techniques.

require 'digest/sha1' class User < ActiveRecord::Base attr_accessor :password has_many :events, :dependent => :destroy has_many :registrations, :dependent => :destroy has_many :activities, :through => :registrations, :source => :event validates_presence_of validates_length_of validates_uniqueness_of validates_format_of validates_presence_of validates_format_of validates_presence_of validates_length_of :login :login, :within => 3..40 :login, :case_sensitive => false :login, :with => /^[\w\.-]+$/i :email :email, :with => /^[^@][\w.-]+@[\w.-]+[.][a-z]{2,4}$/i :password, :if => :password_required :password, :within => 4..40, :if => :password_required

It s also possible to redirect both STDOUT as STDERR as well. This would happen if you use the command grep root * 2> somefile > someotherfile. As I mentioned previously, one of the interesting features of redirection is that you can use it to redirect output to regular files and you can also redirect output to device files. One of the nice features of a Linux system is that any device connected to your system can be

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To run a very simple stored procedure, you need only to provide the name of the stored procedure after EXEC. Notice you do not use a SELECT statement to extract the result from a stored procedure, which eliminates your ability to format a result set with the tools of a SELECT statement. If you require formatting, include it in your SELECT statement within the stored procedure. The following listing illustrates the syntax for invoking the stored procedure created by the preceding CREATE PROCEDURE statement. After the EXEC statement, you see the result set returned by the stored procedure. EXEC usp_SalePersonNamePhoneEmail

validates_confirmation_of :password, before_save :encrypt_new_password def self.authenticate(login, password) user = find_by_login(login) return user if user && user.authenticated (password) end def authenticated (password) hashed_password == encrypt(password) end protected def encrypt_new_password return if password.blank self.hashed_password = encrypt(password) end def password_required hashed_password.blank || !password.blank end def encrypt(string) Digest::SHA1.hexdigest(string) end end

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Use this option to tell the mount command not to insist indefinitely on mounting the remote share. If the directory could not be mounted after the default time out value (normally 60 seconds), the mount attempt is aborted. Use this option for all noncritical mounts. Use this option to tell the mount command that it should continue trying to access the mount indefinitely. But be aware that, if the mount is performed at boot time, this option may cause the boot process to hang. Therefore, use this option only on directories that are really needed. This default option tells the mount command that all mounts must be activated as foreground mounts. The result is that you can do nothing else on that screen as long as the mount could not be completed. This option performs the mount as a background mount. If the first attempt isn t successful, all other attempts are started in the background. This option specifies the number of bytes that the client reads from the server at the same time. For compatibility reasons, this size is set to 1,024 bytes by default. NFS version 3 and later can handle much more than this. To increase the performance of your NFS server, set it to a higher value, such as 8,192 bytes. Use this option to set the maximum number of bytes that can be written simultaneously. Again, the default is 1,024, but NFS 3 and later can handle much more, so specify 8,192 to optimize the write speed for your NFS server.

Whenever you re storing something sensitive, like a password, you want to encrypt it. To encrypt the password in our User model, we use a simple algorithm called a hash that will create a random-looking string from the provided input. This hashed output cannot be turned back into the original string easily, so even if someone steals your database, he will have a prohibitively difficult time discovering your users passwords. Ruby has a built-in library called Digest, which includes many hashing algorithms. Let s go through the additions to our User model: require 'digest/sha1': We start by requiring the Digest library we will use for encrypting the passwords. This loads the needed library and makes it available to work with in our class.

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