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In their simplest form, the various constraints that are specified within a database are checked every time an attempt is made to change the database contents that is, during the execution of every attempted INSERT, UPDATE, or DELETE statement. For database systems claiming only Intermediate-Level or Entry-Level conformance to the SQL2 standard, this is the only mode of operation allowed for database constraints. The Full-Level SQL2 standard specifies an additional capability for deferred constraint checking. When constraint checking is deferred, the constraints are not checked for each individual SQL statement. Instead, constraint checking is held in abeyance until the end of a SQL transaction. (Transaction processing and the associated SQL statements are described in detail in 12.) When the completion of the transaction is signaled by the SQL COMMIT statement, the DBMS checks the deferred constraints. If all of the constraints are satisfied, then the COMMIT statement can proceed, and the transaction can complete normally. At this point, any changes made to the database during the transaction become permanent. If, however, one or more of the constraints would be violated by the proposed transaction, then the COMMIT statement fails, and the transaction is rolled back that is, all of the proposed changes to the database are reversed, and the database goes back to its state before the transaction began. Deferred constraint checking can be very important when several updates to a database must all be made at once to keep the database in a consistent state. For example, suppose the demo database contained this assertion: Ensure that an office s quota target is exactly equal to the sum of the quotas for its salespeople.

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CREATE ASSERTION quota_totals CHECK ((OFFICES.QUOTA = SUM(SALESREPS.QUOTA)) AND (SALESREPS.REP_OFFICE = OFFICES.OFFICE))

INSERT INTO MOVIE (MOVIE_ID, MOVIE_GENRE_CODE, MPAA_RATING_CODE, MOVIE_TITLE, RETAIL_PRICE_VHS, RETAIL_PRICE_DVD, YEAR_PRODUCED) VALUES (6, 'ActAd', 'PG-13', 'Pirates of the Caribbean: The Curse of the Black Pearl', 24.99, 29.99, '2003'); INSERT INTO MOVIE (MOVIE_ID, MOVIE_GENRE_CODE, MPAA_RATING_CODE, MOVIE_TITLE, RETAIL_PRICE_VHS, RETAIL_PRICE_DVD, YEAR_PRODUCED) VALUES (7, 'Drama', 'PG-13', 'Big Fish', 14.95, 19.94, '2003'); INSERT INTO MOVIE (MOVIE_ID, MOVIE_GENRE_CODE, MPAA_RATING_CODE, MOVIE_TITLE, RETAIL_PRICE_VHS, RETAIL_PRICE_DVD, YEAR_PRODUCED) VALUES (8, 'ActAd', 'R', 'Man on Fire', 50.99, 29.98, '2004'); INSERT INTO MOVIE (MOVIE_ID, MOVIE_GENRE_CODE, MPAA_RATING_CODE, MOVIE_TITLE, RETAIL_PRICE_VHS, RETAIL_PRICE_DVD, YEAR_PRODUCED) VALUES (9, 'ActAd', 'PG-13', 'Master and Commander: The Far Side of the World', 12.98, 39.99, '2003'); INSERT INTO MOVIE (MOVIE_ID, MOVIE_GENRE_CODE, MPAA_RATING_CODE, MOVIE_TITLE, RETAIL_PRICE_VHS, RETAIL_PRICE_DVD, YEAR_PRODUCED) VALUES (10, 'Drama', 'R', 'Lost in Translation', 49.99, 14.98, '2003'); INSERT INTO MOVIE (MOVIE_ID, MOVIE_GENRE_CODE, MPAA_RATING_CODE, MOVIE_TITLE, RETAIL_PRICE_VHS, RETAIL_PRICE_DVD, YEAR_PRODUCED) VALUES (11, 'Rmce', 'PG-13', 'Two Weeks Notice', 6.93, 14.97, '2002');

Without the deferred constraint checking, this constraint would effectively prevent you from ever adding a salesperson to the database. Why Because to keep the office quota and the salespersons quotas in the right relationship, you must both add a new salesperson row with the appropriate quota (using an INSERT statement) and increase the quota for the appropriate office by the same amount (using an UPDATE statement). If you try to perform the INSERT statement on the SALESREPS table first, the OFFICES table will not yet have been updated, the assertion will not be TRUE, and the statement will fail. Similarly, if you try to perform the UPDATE statement on the OFFICES table first, the SALESREPS table will not yet have been updated, the assertion will not be TRUE, and the statement will fail. 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.

11:

attributes control overall operational options. Connection options apply to a particular connection created by the SQLConnect() call but may vary from one connection to another. Statement attributes apply to the processing of an individual statement, identified by a CLI statement handle. A set of CLI calls, shown in Figure 19-22, is used by an application program to control attributes. The get calls (SQLGetEnvAttr(), SQLGetConnectAttr(),

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