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4. What can you do to prevent a user from re-establishing a network connection after you have disconnected that user from a shared folder

Use the Sessions folder in the Computer Management window to view which users have a connection to open files on a computer and the files to which they have a connection.

If you want to enable the polymorphic union feature, a requirement for this polymorphic association is that it s inverse; there must be a mapping on the opposite side. In the mapping of BillingDetails, with <union-subclass>, you have to include a <many-to-one> association:

Case Scenario Exercise 17-19

You can also use the Sessions folder to disconnect a specific user or all users with a network connection to a computer. You can also use the Computer Management window to send administrative messages to the users on one or more computers.

<class name="BillingDetails" abstract="true"> <id name="id" column="BILLING_DETAILS_ID" .../> <property .../> <many-to-one name="user" column="USER_ID" class="User"/> <union-subclass name="CreditCard" table="CREDIT_CARD"> <property .../> </union-subclass> <union-subclass name="BankAccount" table="BANK_ACCOUNT"> <property .../> </union-subclass> </class>

In this exercise, you will read a scenario about monitoring shared folders and then answer the questions that follow. If you have difficulty completing this work, review the material in this chapter before beginning the next chapter. You can find answers to these questions in the Questions and Answers section at the end of this chapter.

You are working as an administrator for a company named Contoso, Ltd, a manufacturer of crystal glassware. You are working with Ray, a user in the Marketing department who has several shared folders on his computer running Windows XP Professional. One of these folders, Brochures, is used by many users in the department. Often, other users complain to Ray that they cannot gain access to the Brochures folder. Ray is aware that his computer supports only 10 concurrent connections, but he is sure that on many occasions, fewer than 10 people are actually using the files in the Brochures folder.

You have two tables for both concrete classes of the hierarchy. Each table has a foreign key column, USER_ID, referencing the USERS table. The schema is shown in figure 7.14. Now, consider the following data-access code:

2. Ray wants to be able to determine how many users are connecting to the Brochures folder at any given time. How could he do this What requirements must he meet

17-20

aUser.getBillingDetails().iterator().next();

17

1. 2.

3. Ray also wants to be able to determine which users are connected to his computer. How could he do this

Hibernate executes a UNION query to retrieve all instances that are referenced in this collection:

4. Concerned that more than 10 users might need to connect to the shared folders on his computer at a time, Ray asks for your opinion. What should you tell him

You are working as an administrator for a company named Lucerne Publishing, a publisher of electronic reference materials for government contracting firms. Sofia, one of the managing editors, calls to tell you that she is having trouble connecting to a shared folder on the network. The folder is located on a computer running Windows XP Professional that belongs to one of her junior editors, Kevin. Kevin is out of town for the week, and Sofia needs several files from Kevin s computer. You confirm that both Sofia s and Kevin s computers are both operational and are successfully connected to the network. Sofia is a member of the following groups: Users, Editors, and Managing Editors. 1. How can you confirm that Kevin s computer actually has a shared folder available

select BD.* from ( select BILLING_DETAILS_ID, USER_ID, OWNER, NUMBER, EXP_MONTH, EXP_YEAR, null as ACCOUNT, null as BANKNAME, null as SWIFT, 1 as CLAZZ from CREDIT_CARD union select BILLING_DETAILS_ID, USER_ID, OWNER, null as NUMBER, null as EXP_MONTH, null as EXP_YEAR ACCOUNT, BANKNAME, SWIFT, 2 as CLAZZ from BANK_ACCOUNT ) BD where BD.USER_ID =

2. After confirming that the shared folder is indeed on Kevin s computer, how can you ensure that Sofia has the appropriate permissions to access the shared folder

Exam Highlights 17-21