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In most of the Try This exercises in this book, you used a client application to access your SQL database interactively. However, because of the subject matter of this chapter, particularly with regard to embedded SQL, this exercise will take a different approach from previous Try This exercises. For this exercise, you will use some type of text editing program (such as Microsoft Notepad) to complete the steps. Because programming in a host language is beyond the scope of this book, you will create only the SQL statements that are embedded in the host language. The statements will conform to C, although they might apply to other host languages. In the exercise, you will set up variable declarations, create an error-handling statement, and embed an SQL SELECT statement that queries data from the INVENTORY database. You can download the Try_This_17_1.txt file, which contains the embedded SQL statements used in this Try This exercise.

In many network environments, the knowledge of a simple password can circumvent any level of security. Perhaps one of the most important security measures an administrator can take is to educate users about potential security risks. Tell them never to share their passwords with other users, and inform them that IT staff will never ask them for this information, because an administrator can always change their password, if needed. A good way to enforce this policy is to recommend that they choose an embarrassing or very personal password. Finally, to keep users from sticking scraps of paper to the bottoms of their keyboards, notify them that they will be held responsible if another user uses their account without permission, unless adequate security measures are taken. Also, make sure that users have a good basic understanding of the Windows NT File System (NTFS) permissions file and directory permissions may change if these objects are moved or copied to different locations. (For technical details, see 3, Data Protection in Windows NT/2000. ) In many ways, maintaining a secure environment is more dependent on personnel and policy issues than on technology. Suppose an administrative assistant or other user

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1. Open a text editing program such as Microsoft Notepad. 2. The first step is to create one input host variable and two output host variables. The

written in Java. They use a different API known as JDBC, which is covered in the next section. A common dilemma is that relational database vendors do not handle advanced functions in the same way. This problem can be circumvented using an escape clause that tells the ODBC driver to pass the proprietary SQL statements through the ODBC API untouched. The downside of this approach, of course, is that applications written this way are not portable to a different vendor s database (and sometimes not even to a different version of the same vendor s database).

purpose of the input host variable is to be able to receive a CD identifier from the user. That identifier can then be used in the WHERE clause of the SELECT statement to determine which row of data will be returned from the COMPACT_DISCS table. Along with declaring the variables, you will include comments that identify the purpose of those variables. Type the following embedded SQL statements and variable declarations into your text document:

accidentally deletes a file, or makes unwelcome changes to it Compare that possibility with the risk that an outsider will attack your system and attempt to corrupt or destroy your data Although everyday data crises don t get as much media attention as hacker attacks, the potential for mishaps during routine business use is an important reason for establishing a good security and data protection policy Data entry clerks, for example, should generally not have the permissions needed to drop a table into a database, regardless of whether or not they know how to do it Users should be aware of the following recommendations: w Lock workstations when they re unattended This will prevent anyone from walking up to a user s computer and casually viewing any onscreen information (or using the user s permissions) To lock a Windows NT/2000 computer, a user can press CTRL-ALT-DELETE and click Lock Workstation.

EXEC SQL BEGIN DECLARE SECTION; long v_CD_ID; /* input variable for CD identifier */ varchar v_CD_TITLE[60]; /* output variable for CD title */ long v_IN_STOCK; /* output variable for IN_STOCK value */ EXEC SQL END DECLARE SECTION;

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