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order on the screen, possibly in a computer-generated form, waiting for a signal from the user to advance to the next row Browsing continues in this fashion until the user reaches the end of the query results The cursor serves as a pointer to the current row of query results If the query draws its data from a single table and it is not a summary query, as in this example, the cursor implicitly points to a row of a database table, because each row of query results is drawn from a single row of the table While browsing the data, the user may spot data that should be changed For example, the order quantity in one of the orders may be incorrect, or the customer may want to delete one of the orders In this situation, the user wants to update or delete this order.

This can produce unexpected and unintuitive behavior for compound foreign keys, such as the one that links the ORDERS table to the PRODUCTS table Suppose for a moment that the ORDERS table in the sample database permitted NULL values for the PRODUCT column, and that the PRODUCTS/ORDERS relationship had a SET NULL delete rule (This is not the actual structure of the sample database, for the reasons illustrated by this example) An order for a product with a manufacturer id (MFR) of ABC and a NULL product id (PRODUCT) can be successfully inserted into the ORDERS table because of the NULL value in the PRODUCT column DB2 and the ANSI/ISO standard assume that the row meets the referential integrity constraint for ORDERS and PRODUCTS, even though no product in the PRODUCTS table has a manufacturer id of ABC The SET NULL delete rule can produce a similar effect.

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The program in the figure begins by prompting the user for the table name and then queries the system catalog to discover the names of the columns in that table. It asks the user to select the column(s) to be retrieved and constructs a dynamic SELECT statement based on the user s responses. The step-by-step mechanical construction of a select list in this example is very typical of database front-end programs that generate dynamic SQL. In real applications, the generated select list might include expressions or aggregate functions, and there might be additional program logic to generate GROUP BY, HAVING, and ORDER BY clauses. A graphical user interface would also be used instead of the primitive user prompting in the sample program. However, the programming steps and concepts remain the same. Notice that the generated SELECT statement is identical to the interactive SELECT statement that you would use to perform the requested query. The handling of the PREPARE and DESCRIBE statements and the method of allocating storage for the retrieved data in this program are also typical of dynamic query programs. Note how the program uses the column descriptions placed in the SQLVAR array to allocate a data storage block of the proper size for each column. This program also allocates space for an indicator variable for each column. The program places the address of the data block and indicator variable back into the SQLVAR structure.

The row is not identified by the usual SQL search condition; rather, the program uses the cursor as a pointer to indicate which row is to be updated or deleted Embedded SQL supports this capability through special versions of the DELETE and UPDATE statements, called the positioned DELETE and positioned UPDATE statements, respectively The positioned DELETE statement, shown in Figure 17-30, deletes a single row from a table The deleted row is the current row of a cursor that references the table To process the statement, the DBMS locates the row of the base table that corresponds to the current row of the cursor and deletes that row from the base table After the row is deleted, the cursor has no current row.

Instead, the cursor is effectively positioned in the empty space left by the deleted row, waiting to be advanced to the next row by a subsequent FETCH statement The positioned UPDATE statement, shown in Figure 17-31, updates a single row of a table The updated row is the current row of a cursor that references the table To process the statement, the DBMS locates the row of the base table that corresponds to the current row of the cursor and updates that row as specified in the SET clause After the row is updated, it remains the current row of the cursor Figure 17-32 shows an order-browsing program that uses the positioned UPDATE and DELETE statements: 1 The program first prompts the user for a customer number and then queries the ORDERS table to locate all of the orders placed by that customer 2.

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