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As with any prepared statement, this single-row query could be executed repeatedly after being prepared once. It still suffers from the restriction that the number of returned columns, and their data types, must know when the program is written, since they must match exactly the number and data types of the host variables in the INTO clause. This restriction is removed by allowing the use of a SQLDA-style descriptor area instead of a list of host variables, as described in the next section.

tblname[31]; searchcol[31]; updatecol[31]; yes_no[31];

Although its support for PREPARE/EXECUTE processing closely parallels that of DB2 dynamic SQL, the SQL2 standard diverges substantially from DB2 style in the area of dynamic query processing. In particular, the SQL2 standard includes major changes to the DB2 SQL Data Area (SQLDA), which is at the heart of dynamic multirow queries. Recall that a SQL Data Area (SQLDA) provides two important functions: I A flexible way to pass parameters to be used in the execution of a dynamic SQL statement (passing data from the host program to the DBMS), as described earlier in the section EXECUTE with SQLDA. I The way that the query results are returned to the program in the execution of a dynamic SQL query (passing data from the DBMS back to the host program), as described earlier in the section The Dynamic FETCH Statement. The DB2-style SQLDA handles these functions with flexibility, but it has some serious disadvantages. It is a very low-level data structure, which tends to be specific to a particular programming language. For example, the variable-length structure of a DB2-style SQLDA makes it very difficult to represent in the FORTRAN language. The SQLDA structure also implicitly makes assumptions about the memory of the computer system on which the dynamic SQL program is running, how data items in a structure are aligned on such a system, and so on. For the writers of the SQL2 standard, these lowlevel dependencies were unacceptable barriers to portability. Therefore, they replaced the

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You must explicitly declare a constraint to be INITIALLY DEFERRED if you want it to automatically start out each transaction in a deferred state SQL2 adds one more mechanism to control the immediate or deferred processing of constraints You can dynamically change the processing of a constraint during database operation using the SET CONSTRAINTS statement For example, suppose the sample database contains this assertion: CREATE ASSERTION quota_totals CHECK ((OFFICESQUOTA = SUM(SALESREPSQUOTA)) AND (SALESREPSREP_OFFICE = OFFICESOFFICE)) DEFERRABLE INITIALLY IMMEDIATE The initially immediate checking causes the constraint to be processed, statement by statement, for all "normal" database processing For the "special" transaction that adds a new salesperson to the database, however, you will need to temporarily defer constraint processing.

/* Prompt user for printf("Enter name gets(tblname); printf("Enter name gets(searchcol); printf("Enter name gets(updatecol);

18:

table name and column name */ of table to be updated: "); of column to be searched: of column to be updated: "); ");

Dynamic SQL *

/* Build SQL statement in buffer; ask DBMS to compile it */ sprintf(stmtbuf, "update %s set %s = where %s = ", tblname, searchcol, updatecol); exec sql prepare mystmt from :stmtbuf; if (sqlca.sqlcode) { printf("PREPARE error: %ld\n", sqlca.sqlcode); exit(); } /* Loop prompting user for parameters and performing updates */ for ( ; ; ) { printf("\nEnter search value for %s: ", searchcol); scanf("%f", &search_value); printf("Enter new value for %s: ", updatecol); scanf("%f", &new_value); /* Ask the DBMS to execute the UPDATE statement */ execute mystmt using :search_value, :new_value; if (sqlca.sqlcode) { printf("EXECUTE error: %ld\n", sqlca.sqlcode); exit(); } /* Ask user if there is another update */ printf("Another (y/n) "); gets(yes_no); if (yes_no[0] == 'n') break; } printf("\nUpdates complete.\n"); exit(); }

DB2 SQLDA structure with a set of statements for manipulating a more abstract structure called a dynamic SQL descriptor. The structure of a SQL2 descriptor is shown in Figure 18-18. Conceptually, the SQL2 descriptor is parallel to, and plays exactly the same role as, the DB2-style SQLDA shown in Figure 18-7. The fixed part of the SQL2 descriptor specifies a count of the number of items in the variable part of the descriptor. Each item in the variable part contains information about a single parameter being passed, such as its data type, its length, an indicator telling whether a NULL value is being passed, and so on. But unlike the DB2 SQLDA, the SQL2 descriptor is not an actual data structure within the host program. Instead, it is a collection of data items owned by the DBMS software. The host program manipulates SQL2 descriptors creating them, destroying

FIGURE 18-4

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