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Although the standard supports embedded SQL statements in these languages, SQL implementations rarely support embedding statements in all these languages. An implementation might be limited to only one or two programming languages, and some implementations might not support embedded SQL at all (although most implementations provide embedded SQL for at least one language). In addition, many implementations support embedded SQL in languages other than those specified in the SQL standard. For example, Oracle offers SQLJ, which supports embedded SQL in Java programs. When a program contains embedded SQL statements, it must be compiled in a manner different from regular programs. Figure 17-2 illustrates the process followed when compiling these programs. As you can see from the figure, we start with a program file that contains the host programming language and the embedded SQL statements. Before the program is compiled, it is submitted to a precompiler that is specific to the host programming language and the SQL implementation. The precompiler strips the SQL statements out of the host language code, often converting them into comments to document the original statements, and replaces them with calls to vendor-supplied library routines that access the SQL statements. As a result, two files are created, one for the host language and one for the SQL statements. Once a file is created for the host language, the source program is compiled in its normal way, as would be expected from a specific language. The output from the host language compiler is the object code, which is linked to various library routines. From this, an executable program is generated that links to the application plan. The application plan is created by a bind utility that validates and optimizes the SQL statements. The plan contains the SQL statements and information that the program needs to access the database.

Although public relations might not be the primary reason for why you want to protect your information, it should be considered an important factor, because your customers expect some assurances that they are safe doing business with you. The reasons for why they expect such assurances are obvious with respect to institutions such as banks and online trading services, but these expectations affect all companies to some degree. For example, how many times would you have to re-register your information on a company s website before you would give up and go to one of its competitor s sites If you re like me, the answer is not many. Often, companies that allow online retail sales come into the limelight when they have technical failures that prevent their customers from placing orders. This is especially true during times of high activity or when data loss prevents consumers from receiving the products they have purchased. Clearly, this is a situation that no company wants to be associated with. Finally, looking at all the potential problems related to the recent Y2K panic underscores the importance of computers in everything we do. People and businesses now rely more than ever on computers and the information they store. If they re unavailable, people will know about it and complain.

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17:

DECLARE CURSOR overdue_rentals IS SELECT MOVIE_ID, COPY_NUMBER, TRANSACTION_ID, DUE_DATE FROM MOVIE_RENTAL WHERE DUE_DATE < CURRENT_DATE FOR UPDATE OF DUE_DATE;

Source program containing host language and SQL statements Specific to SQL implementation and host language

Some concepts related to data protection are quite obvious, but others may be less evident. For example, we re all very well aware of the effects of hardware failures. Whether it s a hard disk or a power supply, the failure of these parts can cause a lot of headaches. However, your information can be compromised in other, less obvious ways, and although you may not think of these breaches as readily as other failures, they are, in some cases, much more likely to occur. As an example, consider the chapter that I am now writing in Microsoft Word. I could easily lose all the information in this document simply by pressing CTRL-A (to select all the text), hitting the DELETE key (to delete it all), and then saving and closing the document. In this case, none of the standard recovery methods (the Windows Recycle Bin or the Microsoft Word Undo feature) would bring the information back. On a database server, it s even easier to wreak havoc. I could enter a SQL DELETE query (covered later in this book) and forget to enter a WHERE clause. This would delete all the information in one of my database tables, and it would be time to start digging out my backup tapes. From personal experience, I can attest to the fact that these scenarios are

Figure 17-2

1:

You can tell that this is an Oracle example because of the syntax and the use of CURRENT_DATE, which is an Oracle function that returns the current date and time. For other SQL implementations, substitute the expression that yields the current date and time in the RDBMS and adjust other syntax as required. For example, for Microsoft SQL Server, the statement would be

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