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As the example shows, CASCADE delete rules must be specified with care because they can cause widespread automatic deletion of data if they re used incorrectly. Cascaded update rules can cause similar multilevel updates if the foreign key in the child table is also its primary key. In practice, this is not very common, so cascaded updates typically have less far-reaching effects than cascaded deletes. The SET NULL and SET DEFAULT update and delete rules are both two-level rules; their impact stops with the child table. Figure 11-4 shows the OFFICES, SALESREPS,

Part V:

Figure 11-4.

the program passes this statement text to the DBMS:

and ORDERS tables again, with a SET NULL delete rule for the OFFICES/SALESREPS relationship. This time, when the Los Angeles office is deleted, the SET NULL delete rule tells the DBMS to set the REP_OFFICE column to NULL in the SALESREPS rows that refer to office number 21. The rows remain in the SALESREPS table, however, and the impact of the delete operation extends only to the child table.

If you run the program with these inputs:

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The only solution to this dilemma is to defer constraint checking until both statements have completed, and then check to make sure that both operations, taken together, have left the database in a valid state The SQL2 deferred constraint mechanism provides for this capability, and much more Each individual constraint (of all types) within the database can be identified as either DEFERRABLE or NOT DEFERRABLE when it is first created or defined:.

Referential Cycles *

the program passes this statement text to the DBMS:

The EXECUTE IMMEDIATE statement thus gives the program great flexibility in the type of DELETE statement that it executes. The EXECUTE IMMEDIATE statement uses exactly one host variable the variable containing the entire SQL statement string. The statement string itself cannot include host variable references, but there s no need for them. Instead of using a static SQL statement with a host variable like this:

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. 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

exec sql delete from orders where cust = :cust_num;

Figure 11-5.

a dynamic SQL program achieves the same effect by building the entire statement in a buffer and executing it:

11:

- 229 -

sprintf(buffer, "delete from orders where cust = %d", cust_num) exec sql execute immediate :buffer;

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).

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