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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.

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.

This list of components is for the deluxe version the automatic hot dog turner is a cool novelty, but not essential as it is just as easy to turn by hand! If you want to make a simpler cheaper version, substitute the plywood for card, the plastic mirror for tin foil, and rather than have a motor turn your hot dog on a skewer, just provide support for the skewer and do it by hand!

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:.

*** 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

This section covers design and tuning considerations that apply to most SQL implementations. As always, consult the documentation for the DBMS you are using for applicability information.

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

Employee Number: 106 Name: Sue Jackson Office: 22 Quota: 175000.00 Employee Number: 104 Name: Joe Smith Office: * Quota: 275000.00

Based on the user s response to the initial questions, the program generates this dynamic UPDATE statement and prepares it:

The statement specifies four parameters, and the program allocates a SQLDA big enough to handle four SQLVAR structures. When the user supplies the first set of parameter values, the dynamic UPDATE statement becomes:

The query optimizer is the software component in the RDBMS that analyzes an SQL statement to determine the best way to execute it Most modern optimizers are cost-based, which means that they estimate the cost of all possible ways to execute a statement and then chose the one with the lowest cost An important component of cost-based optimizers is statistics gathered from the database, such as the number of rows in each table and the number of unique values each indexed column has However, some optimizers are rule-based, which means that they apply a set of rules to the SQL statement instead of cost estimates when deciding how to best execute it A few optimizers such as Oracle s allow a choice of either cost-based or rule-based.

and with the second set of parameter values, it becomes: