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When you develop a program that contains embedded SQL, you must follow specific conventions that determine how the SQL code is added to the program. These conventions are based on a combination of special SQL language elements and the requirements of the host programming language. In order to be used in a host language, an embedded SQL statement must conform to the following guidelines:

Each SQL statement must begin with a qualified prefix. Each SQL statement may or may not require a qualified terminator, depending on the host language. Line breaks within the SQL statement must be handled according to the style of the host language. The placement of comments must be handled according to the style of the host language.

Again, we ll cover the details of these solutions in later chapters. The goal here was to give you an idea of the technical constraints that will affect your data protection plan.

; ; END-EXEC (no terminator) ) ; ;

DECLARE overdue_rentals CURSOR FOR SELECT MOVIE_ID, COPY_NUMBER, TRANSACTION_ID, DUE_DATE FROM MOVIE_RENTAL WHERE DUE_DATE < getdate() FOR UPDATE OF DUE_DATE;

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Table 17-1 Beginning and Ending an SQL Statement Most embedded SQL statements require a qualified prefix and terminator. Table 17-1 provides the prefix and terminator for each supported programming language. As you can see from the table, the Ada, C, Pascal, and PL/I languages all handle an embedded SQL statement in the same way. For example, suppose you want to embed a SELECT statement that retrieves the CD_NAME and IN_STOCK columns from the CD_INVENTORY table. To do so, you would use the following statement:

The real interface between systems administrators and their backup hardware is the software solution used. Within the backup tools and utilities, users can set up what should be backed up, to which media, and how often. A good example is the Backup utility included in Windows 2000 (see Figure 2-5). Additionally, more complex operations, such as performing backups of remote servers and workstations, can be managed. Backup software must also be able to handle special types of operations. In later chapters, we ll see how third-party programs include options for backing up items such as Microsoft SQL Server databases while they are in use. Overall, these tools help you manage the complexities of dealing with security and distributed data stored on heterogeneous client and server types.

EXEC SQL SELECT CD_NAME, IN_STOCK FROM CD_INVENTORY;

Figure 2-5.

Notice that the statement is preceded by the EXEC SQL prefix and ended with the semicolon terminator. If you were to create a similar statement in another language, your prefix or terminator might be different. In the case of MUMPS, they would both be different.

The cursor must be opened before it can be used. In this example, the RDBMS may not have to retrieve any rows when you open the cursor, but for ef ciency it might decide to retrieve some number of rows and place them in a buffer for you. A buffer is merely an area of computer memory used to temporarily hold data. It is far more ef cient to use a buffer to hold some number of prefetched rows than it is going to

Normally, it doesn t matter whether your embedded SQL statements appear in uppercase or lowercase. Programmers generally follow the conventions of the host language. However, for the purposes of this chapter, I ll treat embedded SQL statements as I have other SQL statements throughout the book: I ll use uppercase for both SQL keywords and SQL identifiers.

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