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The handling of the PREPARE and DESCRIBE statements and the method of allocating storage for the retrieved data in this program are also typical of dynamic query programs Note how the program uses the column descriptions placed in the SQLVAR array to allocate a data storage block of the proper size for each column This program also allocates space for an indicator variable for each column The program places the address of the data block and indicator variable back into the SQLVAR structure The OPEN, FETCH, and CLOSE statements play the same role for dynamic queries as they do for static queries, as illustrated by this program Note that the FETCH statement specifies the SQLDA instead of a list of host variables Because the program has previously filled in the SQLDATA and SQLIND fields of the SQLVAR array, the DBMS knows where to place each retrieved column of data.

OPEN qrycursor USING SQL DESCRIPTOR parmdesc;

- 234 -

As this example shows, much of the programming required for a dynamic query is concerned with setting up the SQLDA and allocating storage for the SQLDA and the retrieved data The program must also sort out the various types of data that can be returned by the query and handle each one correctly, taking into account the possibility that the returned data will be NULL These characteristics of the sample program are typical of production.

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The technique for passing input parameters to the OPEN statement via the SQL2 descriptor is exactly the same as that described earlier for the EXECUTE statement. Like the Oracle implementation of dynamic SQL, the SQL2 standard provides a way for the host program to obtain a description of the parameters in a dynamic query as well as a description of the query results. For the program fragment in Figure 18-14, this DESCRIBE statement:

18:

DESCRIBE INPUT querystmt USING SQL DESCRIPTOR parmdesc;

Dynamic SQL*

will return, in the SQL2 descriptor named parmdesc, a description of each of the parameters that appears in the dynamic query. The number of parameters can be obtained with the GET DESCRIPTOR statement, retrieving the COUNT item from the descriptor. As with the Oracle implementation, the SQL2 standard can have two descriptors associated with a dynamic query. The input descriptor, obtained with the DESCRIBE INPUT statement, contains descriptions of the parameters. The output descriptor contains descriptions of the query results columns. The standard allows you to explicitly ask for the output description:

applications that use dynamic queries. Despite the complexity, the programming is not too difficult in languages like C, C++, Pascal, PL/I, or Java. Languages such as COBOL and FORTRAN, which lack the capability to dynamically allocate storage and work with variable-length data structures, are not practical for dynamic query processing. The following sections discuss the DESCRIBE statement and the dynamic versions of the DECLARE CURSOR, OPEN, and FETCH statements.

As in the previous SQL Server example, the references DELETED.OFFICE and INSERTED.OFFICE in the trigger refer, respectively, to the values of the OFFICE column before and after the UPDATE statement. The trigger definition must be able to differentiate between these "before" and "after" values to perform the appropriate search and update actions specified by the trigger.

DESCRIBE OUTPUT querystmt USING SQL DESCRIPTOR qrydesc;

The UPDATE statement, shown in Figure 10-6, modifies the values of one or more columns in selected rows of a single table. The target table to be updated is named in the statement, and you must have the required permission to update the table as well as each of the individual columns that will be modified. The WHERE clause selects the rows of the table to be modified. The SET clause specifies which columns are to be updated and calculates the new values for them. Here is a simple UPDATE statement that changes the credit limit and salesperson for a customer: Raise the credit limit for Acme Manufacturing to $60,000 and reassign the company to Mary Jones (employee number 109).

but the DESCRIBE OUTPUT form of the statement is the default, and the most common practice is to omit the keyword OUTPUT. Returning to the dynamic query example of Figure 18-9, the cursor has been opened at callout 7, and it s time to fetch rows of query results at callout 8. Again, the SQL2 form of the FETCH statement is slightly modified to use the SQL2-style descriptor:

UPDATE CUSTOMERS SET CREDIT_LIMIT = 60000.00, CUST_REP = 109 WHERE COMPANY = 'Acme Mfg.'; 1 row updated.

FETCH sqlcurs USING SQL DESCRIPTOR qrydesc;

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