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Tip On a non-journaling file system, the fsck command can take a very long time to complete. In that case, the -C option can be used when performing a manual check. This option displays a progress bar which doesn t, of course, make it go any faster, but it at least lets you know how long you still have to wait for the process to complete. Currently, the -C option is supported only on Ext2 and Ext3 file systems.

Figure 7-8 shows the results. Listing 7-8 contains one batch after setting the database context. IF block 1 checks to see whether there is a row in the Person.Person table with BusinessEntityID = 1. You can also use ELSE along with IF EXISTS. IF block 2 uses the NOT keyword to make sure that there is not a row with the FirstName Kathi and executes the PRINT statements since there is not a row with that name.

package com.apress.timesheets.dao; import java.util.List; import com.apress.timesheets.entity.UserAccount; public interface UserAccountDao { // Create methods public void create(UserAccount account); // Read methods public List<UserAccount> list(); public UserAccount read(Long id); public UserAccount read(String accountName); // Update methods public void update(UserAccount account); // Delete methods public void delete(UserAccount account); public void delete(Long id); } In fact, the You Ain t Gonna Need It (YAGNI) principle of agile programming suggests that I may already have produced a more complicated API than is strictly required for the timesheet application, although it is still useful for the purposes of my examples. In a real application, your API should be driven by the requirements and should not necessarily reflect Listing 4-2 exactly. If one of the CRUD operations is not required by your application s use cases, there is no need to implement it.

A very useful option although one that is often misunderstood is the link. A link can be compared to a shortcut: it s basically a pointer to another file. On Linux (as on any UNIX system), two different kinds of links are supported: the hard link and the symbolic link.

Figure 7-8. The results of using IF EXISTS You should now know how to use IF and ELSE in a number of situations. Practice what you have learned by completing Exercise 7-2.

Basically, a link makes it easier to find files you need Links can be created for the operating system and program files that are used on that operating system, and they can be used to make life easier for users as well Imagine that some users belong to the group account and you want the group members to create files that are readable by all other group members in the directory /home/groups/account To do this, you can ask the users to change to the proper directory every time they want to save a file Or you can create a link for each user in his or her home directory.

Although the various data access libraries supported by Spring have quite different implementations, they do tend to have similar usage patterns. Spring takes advantage of this by providing sets of tailored support classes to aid in the building of data access logic, and specifically to aid in building DAO implementations. When building a DAO for a supported database access mechanism, you will generally find that Spring provides helper classes to aid in your implementation. These usually include a template class and a DAO support class. Figure 4-4 shows the relevant classes supporting plain JDBC data access.

Such a link can have the name account and can be placed in the home directory of all users who need to save work in the shared directory for the group account, and it s easy to see how this link makes it a lot easier for the users to save their files to the proper location Another example of why links can be useful comes from the world of FHS, the Filesystem Hierarchy Standard This standard prescribes in which directory a Linux system should store files of a particular kind In the old days, the X Windowing System had all its binaries installed in the /usr/X11 directory Later, the name of the directory where the X Windowing System stored its configuration files was changed to /usr/X11R6 Now imagine what would happen if an application referred to the /usr/X11 directory after this change.

Exercise 7-2