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Scroll cursors can be especially useful in programs that allow a user to browse database contents In response to the user s request to move forward or backward through the data a row or a screenful at a time, the program can simply fetch the required rows of the query results However, scroll cursors are also a great deal harder for the DBMS to implement than a normal, unidirectional cursor To support a scroll cursor, the DBMS must keep track of the previous query results that it provided for a program and of the order in which it supplied those rows of results The DBMS must also ensure that no other concurrently executing transaction modifies any data that has become visible to a program through a scroll cursor, because the program can use the extended FETCH statement to re-retrieve the row, even after the cursor has moved past the row.

Figure 18-9.

If you use a scroll cursor, you should be aware that certain FETCH statements on a scroll cursor may have a very high overhead for some DBMS brands If the DBMS brand normally carries out a query step-by-step as your program FETCHes its way down through the query results, your program may wait a much longer time than normal if you request a FETCH NEXT operation when the cursor is positioned at the first row of query results It s best to understand the performance characteristics of your particular DBMS brand before writing programs that depend on scroll cursor functionality for production applications Because of the usefulness of scroll cursors, and because a few DBMS vendors had begun to ship scroll cursor implementations that were slightly different from one another, the SQL standard was expanded to include support for scroll cursors.

Data retrieval with dynamic SQL (continued)

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The Entry SQL level of the standard requires only the older-style, sequential forward cursor, but conformance at the Intermediate SQL or Full SQL levels requires full support for the scroll cursor syntax shown in Figure 17-29 The standard also specifies that if any motion other than FETCH NEXT (the default) is used on a cursor, its DECLARE CURSOR statement must explicitly identify it as a scroll cursor Using the standard syntax, the cursor declaration in Figure 17-23 would appear as:.

18:

exec sql declare select from where order repcurs scroll cursor for name, quota, sales salesreps sales > quota by name;

Dynamic SQL *

row, because Tom has not yet been assigned to an office But the NULL value poses an interesting question about the referential integrity constraint created by the primary key/foreign key relationship Does the NULL value match one of the primary key values or doesn't it The answer is "maybe" it depends on the "real" value of the missing or unknown data Both DB2 and the ANSI/ISO SQL1 standard automatically assume that a foreign key that contains a NULL value satisfies the referential integrity constraint In other words, they give the row "the benefit of the doubt" and allow it to be part of the child table, even though its foreign key value doesn't match any row in the parent table Interestingly, the referential integrity constraint is assumed to be satisfied if any part of the foreign key has a NULL value.

Application programs often use cursors to allow the user to browse through a table of data row by row. For example, the user may ask to see all of the orders placed by a particular customer. The program declares a cursor for a query of the ORDERS table and displays each

printf("%lf", *((double *)(qry_var->sqldat))); break; } } } no_more_data: printf("\nEnd of data.\n"); /* Clean up allocated storage */ for (i = 0; i < colcount; i++) { qry_var = qry_da->sqlvar + i; free(qry_var->sqldata); free(qry_var->sqlind); } free(qry_da); close qrycurs; exit(); }

17:

Figure 18-9.

FIGURE 17-30

Data retrieval with dynamic SQL (continued)

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