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column of query results, in left-to-right order. The fields of each SQLVAR describe the corresponding column: I The SQLNAME structure specifies the name of the column (with the name in the DATA field and the length of the name in the LENGTH field). If the column is derived from an expression, the SQLNAME field is not used. I The SQLTYPE field specifies an integer data type code for the column. The data type codes used by different brands of DBMS vary. For the IBM SQL products, the data type code indicates both the data type and whether NULL values are allowed, as shown in Table 18-1. I The SQLLEN field specifies the length of the column. For variable-length data types (such as VARCHAR), the reported length is the maximum length of the data; the length of the columns in individual rows of query results will not exceed this length. For DB2 (and many other SQL products), the length returned for a DECIMAL data type specifies both the size of the decimal number (in the upper byte) and the scale of the number (in the lower byte). I The SQLDATA and SQLIND fields are not filled in by the DBMS. Your application program fills in these fields with the addresses of the data buffer and indicator variable for the column before using the SQLDA later in a FETCH statement.

/* character entered by user */

An application that enters or updates data in the table that contains the foreign key should usually enforce an "all NULLs or no NULLs" rule on the columns of the foreign key Foreign keys that are partially NULL and partially non-NULL can easily create problems The SQL2 standard addresses this problem by giving the database administrator more control over the handling of NULL values in foreign keys for integrity constraints The integrity constraint in the CREATE TABLE statement provides two options: The MATCH FULL option requires that foreign keys in a child table fully match a primary key in the parent table With this option, no part of the foreign key can contain a NULL value, so the issue of NULL value handling in delete and update rules does not arise.

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Data Type CHAR VARCHAR LONG VARCHAR SMALLINT INTEGER FLOAT DECIMAL DATE TIME TIMESTAMP GRAPHIC VARGRAPHIC Table 18-1.

/* Declare the cursor for the query */ exec sql declare ordcurs cursor for select order_num, ord_date, mfr, product, qty, amount from orders where cust = custnum order by order_num for update of qty, amount; /* Prompt the user for a customer number */ printf("Enter customer number:"); scanf("%d", &custnum); /* Set up error processing */ whenever sqlerror goto error; whenever not found goto done; /* Open the cursor to start the query */ exec sql open ordcurs; /* Loop through each row of query results */ for (;;) { /* Fetch the next row of query results */ exec sql fetch ordcurs into :ordnum, :orddate, :ordmfr, :ordproduct, :ordqty, :ordamount; /* Display the retrieved data */ printf("Order Number: %d\n", ordnum); printf("Order Date: %s\n", orddate); printf("Manufacturer: %s\n", ordmfr); printf("Product: %s\n", ordproduct); printf("Quantity: %s\n", ordqty); printf("Total Amount: %f\n", ordamount); /* Prompt user for action on this order */ printf("Enter action (Next/Delete/Update/Exit): "); gets(inbuf); 1

A complication of using the DESCRIBE statement is that your program may not know in advance how many columns of query results there will be, and therefore, it may not know how large a SQLDA must be allocated to receive the description One of three strategies is typically used to ensure that the SQLDA has enough space for the returned descriptions I If the program has generated the select list of the query, it can keep a running count of the select items as it generates them In this case, the program can allocate a SQLDA with exactly the right number of SQLVAR structures to receive the column descriptions This approach was used in the program shown in Figure 18-9.

FIGURE 17-32

I If it is inconvenient for the program to count the number of select list items, it can initially DESCRIBE the dynamic query into a minimal SQLDA with a one-element SQLVAR array When the DESCRIBE statement returns, the SQLD value tells the program how large the SQLDA must be The program can then allocate a SQLDA of the correct size and reexecute the DESCRIBE statement, specifying the new SQLDA There is no limit to the number of times that a prepared statement can be described I Alternatively, the program can allocate a SQLDA with a SQLVAR array large enough to accommodate a typical query A DESCRIBE statement using this SQLDA will succeed most of the time.

17:

switch (inbuf[0]) { case 'N': /* Continue on to the next order */ break; case 'D': /* Delete the current order */ exec sql delete from orders where current of ordcurs; break; case 'U': /* Update the current order */ printf("Enter new quantity: "); scanf("%d", &ordqty); printf("Enter new amount: "); scanf("%f", &ordamount); exec sql update orders set qty = :ordqty, amount = :ordamount where current of ordcurs; break; case 'X': /* Stop retrieved orders and exit */ goto done; } } done: exec sql close ordcurs; exec sql commit; exit(); error: printf("SQL error: %ld\n", sqlca.sqlcode); exit(); } 3

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