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Another cool feature you can use with redirection is sending the output from one device to another device To understand how this works, let s first look at what happens when you are using cat on a device, as in cat /dev/sda This command would display the complete content of the sda device on the standard output The interesting thing when displaying the contents of a storage device like this is that you can redirect it Imagine a situation in which you have a /dev/sdb as well, and this sdb device is at least as large as /dev/sda and is empty at the moment You can clone the disk just by using cat /dev/sda > /dev/sdb! However, this redirecting to devices can be very dangerous.

Because Hibernate caches objects, there is an implementation in the body of the clear() method to remove cached items, shown in bold in Listing 10-15.

Summary

Imagine what would happen if you were foolish enough to issue the command cat /etc/passwd > /dev/sda; it would just dump the content of the passwd file to the beginning of the /dev/sda device And, because you re working on the raw device here, no file system information is used, and this command would overwrite all important administrative information that is stored at the beginning of the device that is mentioned And you would never be able to boot the device again! In 4, you will learn about the dd command, which can be used to copy data from one device to another device in a way that is much more secure..

The underlying mock object used in the two preceding examples was itself a database implementation. This goes against the grain of what I was saying earlier about the need to test components in isolation from the actual implementation of their dependencies. We have clearly used an actual implementation of a database in the test implementations. Strictly speaking, therefore, this is not a unit test it is an integration test. I talk more about these in the section Integration Testing later in this chapter. Why have I chosen to do this Databases provide a layer of enormously complicated functionality; as a result, the number of ways in which a DAO implementation can interact with its underlying layer is vast. We can create a mock object to emulate the one specific way in which we really interact with the database, and that would be a legitimate unit test, but unfortunately it makes the test extremely brittle. A correct change to the implementation will require a corresponding change to the mock object. In the end, we would be testing not that the unit behaved in the way that it was supposed to, but that it was implemented in the way we anticipated. The behavior could be entirely erroneous. So in the case of the database-based unit tests, I have chosen a halfway house. The mock object is itself a database, but it is an extremely limited embedded database. It will hopefully behave a lot like the real database implementation (such as MySQL, PostgreSQL, Oracle, or

Another useful task you should be able to perform on your server is finding files, and find is the most powerful command to use for that. The find command helps you find files based upon any property a file can have. For starters, you can find files by their names; the access, creation, or modification date; the user who created them; or the permissions set on the file. If you want to find all files whose name begins with hosts, use find / -name "hosts*". I recommend always putting the string that refers to the file you are looking for between quotes because doing so ensures that find knows where the argument starts and where it stops.

For the data to make sense in reports and applications, tables must be joined together. As you can see from the number of topics in this chapter, there are many ways to do it. Most queries will use the INNER JOIN syntax, but for returning all the rows even if there is not a match, you will use an OUTER JOIN. After learning about joins, you learned about subqueries in the WHERE clause using IN and UNION queries. Finally, the chapter covered derived tables and common table expressions, which will help you solve more intriguing query puzzles as you learn more advanced techniques.