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Automatically update the office number for the two salespeople in the SALESREPS table, so that their rows still are linked to the Los Angeles row in the OFFICES table, via its new office number Set the REP_OFFICE column for the two salespeople to NULL, indicating that their office assignment is unknown Set the REP_OFFICE column for the two salespeople to some default value, such as the office number for the headquarters office in New York, indicating that the salespeople are automatically reassigned to that office Although some of these alternatives may seem more logical than others in this particular example, it's relatively easy to come up with examples where any one of the four possibilities is the "right" thing to do, if you want the database to accurately model the real-world situation.

FIGURE 17-8

main() { exec sql include sqlca; exec sql begin declare section; int custnum; /* int ordnum; /* char orddate[12]; /* char ordmfr[4]; /* char ordproduct[6]; /* int ordqty; /* float ordamount; /* exec sql end declare section; char inbuf[101] /*

17:

customer number entered by user*/ retrieved order number */ retrieved order date */ retrieved manufacturer-id */ retrieved product id */ retrieved order quantity */ retrieved order amount */ character entered by user */

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When you type an interactive SQL statement that causes an error, the interactive SQL program displays an error message, aborts the statement, and prompts you to type a new statement. In embedded SQL, error handling becomes the responsibility of the application program. Actually, embedded SQL statements can produce two distinct types of errors: Compile-time errors Misplaced commas, misspelled SQL keywords, and similar errors in embedded SQL statements are detected by the SQL precompiler and reported to the programmer. The programmer can fix the errors and recompile the application program. Runtime errors An attempt to insert an invalid data value or lack of permission to update a table can be detected only at runtime. Errors such as these must be detected and handled by the application program. In embedded SQL programs, the DBMS reports runtime errors to the application program through a returned error code. If an error is detected, a further description of the error and other information about the statement just executed is available through additional diagnostic information. The earliest IBM-embedded SQL implementations defined an error-reporting mechanism that was adopted, with variations, by most of the major DBMS vendors. The central part of this scheme an error status variable named SQLCODE was also defined in the original ANSI/ISO SQL standard. The SQL2 standard, published in 1992, defined an entirely new, parallel error-reporting mechanism, built around an error status variable named SQLSTATE. These mechanisms are described in the next two sections.

/* Declare the cursor for the query */ exec sql declare ordcurs cursor for select order_num, ord_date, mfr, product, qty, amount from orders where cust = cust_num order by order_num for update of qty, amount; /* Prompt the user for a customer number */ printf("Enter customer number: "); scanf("%d", &custnum); /* Set up error processing */ whenever sqlerror goto error; whenever not found goto done; /* Open the cursor to start the query */ exec sql open ordcurs; /* Loop through each row of query results */ for (;;) { /* Fetch the next row of query results */ exec sql fetch ordcurs into :ordnum, :orddate, :ordmfr, :ordproduct, :ordqty, :ordamount; /* Display the retrieved data */ printf("Order Number: %d\n", ordnum); printf("Order Date: %s\n", orddate); printf("Manufacturer: %s\n", ordmfr);

Under this scheme, pioneered by the earliest IBM products, the DBMS communicates status information to the embedded SQL program through an area of program storage called the SQL Communications Area (SQLCA). The SQLCA is a data structure that contains error variables and status indicators. By examining the SQLCA, the application program can determine the success or failure of its embedded SQL statements and act accordingly. Notice that in Figures 17-4, 17-5, 17-6, and 17-7 the first embedded SQL statement in the program is INCLUDE SQLCA. This statement tells the SQL precompiler to include a SQL Communications Area in this program. The specific contents of the SQLCA vary slightly from one brand of DBMS to another, but the SQLCA always provides the same type of information. Figure 17-9 shows the C language definition of the SQLCA used by the IBM databases. The most important part of the SQLCA, the SQLCODE variable, is supported by all of the major embedded SQL products and was specified by the ANSI/ISO SQL1 standard. As the DBMS executes each embedded SQL statement, it sets the value of the variable SQLCODE in the SQLCA to indicate the completion status of the statement: A SQLCODE of zero indicates successful completion of the statement, without any errors or warnings. A negative SQLCODE value indicates a serious error that prevented the statement from executing correctly. For example, an attempt to update a read-only view would produce a negative SQLCODE value. A separate negative value is assigned to each runtime error that can occur.

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