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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.

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

100,001, so the domain of the ORDER_NUM column is positive integers greater than 100,000 Similarly, employee numbers in the EMPL_NUM column must fall within the numeric range of 101 to 999 The DBMS can be asked to prevent other data values in these columns Entity integrity The primary key of a table must contain a unique value in each row, which is different from the values in all other rows For example, each row of the PRODUCTS table has a unique set of values in its MFR_ID and PRODUCT_ID columns, which uniquely identifies the product represented by that row Duplicate values are illegal, because they wouldn't allow the database to distinguish one product from another The DBMS can be asked to enforce this unique values constraint Referential integrity.

Figure 17-2

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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:

A foreign key in a relational database links each row in the child table containing the foreign key to the row of the parent table containing the matching primary key value In the sample database, the value in the REP_OFFICE column of each SALESREPS row links the salesperson represented by that row to the office where he or she works The REP_OFFICE column must contain a valid value from the OFFICE column of the OFFICES table, or the salesperson will be assigned to an invalid office The DBMS can be asked to enforce this foreign key/primary key constraint Other data relationships The real-world situation modeled by a database will often have additional constraints that govern the legal data values that may appear in the database.

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.

News stories have illustrated the magnitude of the wealth that executives can reap through the receipt of stock options In the New York Times Magazine article Heads I Win, Tails I Win, Roger Lowenstein examined the pay of the top executive of SBC Communications, a company he chose for its unspectacular qualities 3 Lowenstein wrote: It is profitable and professionally managed, and its CEO is well regarded in his industry Like many CEOs he pursued a bold growth strategy for much of the 90 s, had some good early years and more recently gave back much of his gains In the last three years, his stock has fallen 27 percent more than either the Standard & Poor s 500 or the stock of his Baby Bell peers Nonetheless CEO Edward E Whitacre, Jr.

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

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