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for each column to be updated If the user types an asterisk (*) in response to the new value prompt, the program assigns the corresponding column a NULL value Because the user can select different columns each time the program is run, this program must use a SQLDA to pass the parameter values to the EXECUTE statement The program illustrates the general technique for using a SQLDA, indicated by callouts in Figure 18-8: 1 The program allocates a SQLDA large enough to hold a SQLVAR structure for each parameter to be passed It sets the SQLN field to indicate how many SQLVARs can be accommodated 2 For each parameter to be passed, the program fills in one of the SQLVAR structures with information describing the parameter 3 The program determines the data type of a parameter and places the correct data type code in the SQLTYPE field 4.

In the sample database, the SALESREPS table contains the REP_OFFICE column, a foreign key for the OFFICES table. The OFFICES table contains the MGR column, a foreign key for the SALESREPS table. As shown in Figure 11-5, these two relationships form a referential cycle. Any given row of the SALESREPS table refers to a row of the OFFICES table, which refers to a row of the SALESREPS table, and so on. This cycle includes only two tables, but it's also possible to construct cycles of three or more tables.

DB2 supports C and PL/I structures, but does not support COBOL or assembly language structures, for example..

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The program determines the length of the parameter and places it in the SQLLEN field 5 The program allocates memory to hold the parameter value and puts the address of the allocated memory in the SQLDATA field 6 The program allocates memory to hold an indicator variable for the parameter and puts the address of the indicator variable in the SQLIND field 7 The program sets the SQLD field in the SQLDA header to indicate how many parameters are being passed This tells the DBMS how many SQLVAR structures within the SQLDA contain valid data 8 The program prompts the user for data values and places them into the data areas allocated in Steps 5 and 6 9 The program uses an EXECUTE statement with the USING DESCRIPTOR clause to pass parameter values via the SQLDA.

Host variables provide two-way communication between the program and the DBMS. In the program shown in Figure 17-21, the host variables repnum and repname illustrate the two different roles played by host variables: The repnum host variable is an input host variable, used to pass data from the program to the DBMS. The program assigns a value to the variable before executing the embedded statement, and that value becomes part of the SELECT statement to be executed by the DBMS. The DBMS does nothing to alter the value of the variable. The repname host variable is an output host variable, used to pass data back from the DBMS to the program. The DBMS assigns a value to this variable as it executes the embedded SELECT statement. After the statement has been executed, the program can use the resulting value.

Note that this particular program copies the prompt string for each parameter value into the SQLNAME structure The program does this solely for its own convenience; the DBMS ignores the SQLNAME structure when you use the SQLDA to pass parameters Here is a sample user dialog with the program in Figure 18-8:.

17:

*** Salesperson Update Program *** Update Update Update Update Update Update Name column (y/n) y Office column (y/n) y Manager column (y/n) n Hire Date column (y/n) n Quota column (y/n) y Sales column (y/n) n PROGRAMMING WITH SQL

main() { exec sql include sqlca; exec sql begin declare section; int repnum; struct{ char name[16]; float quota; float sales; }repinfo; short rep_ind[3]; exec sql end declare section;

Regardless of the number of tables that they involve, referential cycles pose special problems for referential integrity constraints. For example, suppose that NULL values were not allowed in the primary or foreign keys of the two tables in Figure 11-5. (This is not, in fact, the way the sample database is actually defined, for reasons that will become obvious in a moment.) Consider this database update request and the INSERT statements that attempt to implement it: You have just hired a new salesperson, Ben Adams (employee number 115), who is the manager of a new sales office in Detroit (office number 14).

Salesperson's new value for new value for new value for Salesperson's new value for new value for new value for

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