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table and the PRODUCTS table to be updated. The row being inserted is referred to using the pseudo-table name inserted within the UPDATE statements. Here is another example of a trigger definition, this time using Informix Universal Server: CREATE TRIGGER NEWORDER INSERT ON ORDERS AFTER (EXECUTE PROCEDURE NEW_ORDER) This trigger again specifies an action that is to take place AFTER a new order is inserted. In this case, the multiple SQL statements that form the triggered action can't be specified directly in the trigger definition. Instead, the triggered statements are placed into an Informix stored procedure, named NEW_ORDER, and the trigger causes the stored procedure to be executed. As this and the preceding examples show, although the core concepts of a trigger mechanism are very consistent across databases, the specifics vary a great deal. Triggers are certainly among the least portable aspects of SQL databases today.

18:

The SQL2 form of the DESCRIBE statement has a parallel effect on the one it replaces. Descriptions of the query result columns are returned, column by column, into the SQL2 descriptor, instead of into the SQLDA. Because the descriptor is a DBMS structure, rather than an actual data structure in the program, the host program must retrieve the information from the descriptor, piece by piece, as required. The GET DESCRIPTOR statement performs this function, just as the SET DESCRIPTOR function performs the opposite function of putting information into the SQL2 descriptor. In the program of Figure 18-9, the statements at callout 5, which obtains the length of a particular column of query results from a SQLDA, would be replaced with this statement:

Dynamic SQL*

GET DESCRIPTOR qrydesc VALUE (:i + 1) :length = LENGTH; qry_var -> sqldat = malloc(length);

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The statement specifies four parameters, and the program allocates a SQLDA big enough to handle four SQLVAR structures. When the user supplies the first set of parameter values, the dynamic UPDATE statement becomes

The statement at callout 5 that allocates buffers for each item of query results is still needed, but the method for telling the DBMS where to put the results changes for SQL2. Instead of placing the address of the program destination for each item into the SQLDA, the program must place these addresses into the SQL2 descriptor, using the SET DESCRIPTOR statement. The buffers for the indicator variables are not needed with the SQL2 descriptor. Instead, the information about whether a column contains a NULL value can be obtained from the descriptor for each row as it is fetched, as seen later in the program example. In this particular example, the number of columns in the query results are calculated by the program as it builds the query. The program could also obtain the number of columns from the SQL2 descriptor with this form of the GET DESCRIPTOR statement:

This program is somewhat complex, but it s simple compared with a real generalpurpose database update utility. It also illustrates all of the dynamic SQL features required to dynamically execute statements with a variable number of parameters.

Triggers provide an alternative way to implement the referential integrity constraints provided by foreign keys and primary keys. In fact, advocates of the trigger feature point out that the trigger mechanism is more flexible than the strict referential integrity provided by DB2 and the ANSI/ISO standard. For example, here is a trigger that enforces referential integrity for the OFFICES/SALESREPS relationship and displays a message when an attempted update fails: CREATE ON FOR AS TRIGGER REP_UPDATE SALESREPS INSERT, UPDATE IF ((SELECT COUNT(*) FROM OFFICES, INSERTED WHERE OFFICES.OFFICE = INSERTED.REP_OFFICE) = 0) BEGIN PRINT "Invalid office number specified." ROLLBACK TRANSACTION END

GET DESCRIPTOR qrydesc :colcount = COUNT;

The EXECUTE IMMEDIATE, PREPARE, and EXECUTE statements as described thus far support dynamic execution of most SQL statements However, they can t support dynamic queries because they lack a mechanism for retrieving the query results To support dynamic queries, SQL combines the dynamic SQL features of the PREPARE and EXECUTE statements with extensions to the static SQL query-processing statements, and adds a new statement Here is an overview of how a program performs a dynamic query: 1 A dynamic version of the DECLARE CURSOR statement declares a cursor for the query Unlike the static DECLARE CURSOR statement, which includes a hard-coded SELECT statement, the dynamic form of the DECLARE CURSOR statement specifies the statement name that will be associated with the dynamic SELECT statement 2 The program constructs a valid SELECT statement and stores it in a variable, just as it would construct a dynamic UPDATE or DELETE statement.

Having obtained the description of the query results, the program performs the query by opening the cursor at callout 6. The simple form of the OPEN statement,

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