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The simple structure of a hierarchical database became a disadvantage when the data had a more complex structure. In an order-processing database, for example, a single order might participate in three different parent/child relationships, linking the order to the customer who placed it, the salesperson who took it, and the product ordered, as shown in Figure 4-3. The structure of this type of data simply didn t fit the strict hierarchy of IMS. To deal with applications such as order processing, a new network data model was developed. The network data model extended the hierarchical model by allowing a record to participate in multiple parent/child relationships, as shown in Figure 4-4. These relationships were known as sets in the network model. In 1971, the Conference on Data Systems Languages published an official standard for network databases, which became known as the CODASYL model. IBM never developed a network DBMS of its own, choosing instead to extend IMS over the years. But during the 1970s, independent software companies rushed to embrace the network model, creating

Before the update, Bill Adams had a QUOTA value of $350,000 and a SALES value of $367,911. After the update, his row has a SALES value of $350,000, not $400,000. The order of the assignments in the SET clause is thus immaterial; the assignments can be specified in any order.

Figure 4-3.

10:

The FETCH statement advances the cursor to the next row of query results and brings the values for that row into the program buffers, as specified within the descriptor structure. The program must still use the descriptor to determine information about each column of returned results, such as its length or whether it contains a NULL value. For example, to determine the returned length of a column of character data, the program might use the statement:

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The DESCRIBE statement, shown in Figure 18-10, is unique to dynamic queries. It is used to request a description of a dynamic query from the DBMS. The DESCRIBE statement is used after the dynamic query has been compiled with the PREPARE statement but before it is executed with the OPEN statement. The query to be described is identified by its statement name. The DBMS returns the query description in a SQLDA supplied by the program.

Summary

GET DESCRIPTOR qrydesc VALUE(:i + 1) :length = RETURNED_LENGTH;

main() { /* This is a simple general-purpose query program. It prompts the user for a table name, and then asks the user which columns of the table are to be included in the query. After the user's selections are complete, the program runs the requested query and displays the results. */ exec sql include sqlca; exec sql include sqlda; exec sql begin declare section; char stmtbuf[2001]; char querytbl[32]; char querycol[32]; exec sql end declare section;

To determine whether the value in the column was NULL, the program can use the statement:

/* SQL text to be executed */ /* user-specified table */ /* user-specified column */

GET DESCRIPTOR qrydesc VALUE(:i + 1) :indbuf = INDICATOR;

/* Cursor for system catalog query that retrieves column names */ exec sql declare tblcurs cursor for select colname from system.syscolumns where tblname = :querytbl and owner = user; exec sql declare qrycurs cursor for querystmt; /* Data structures for the program int colcount = 0; struct sqlda *qry_da; struct sqlvar *qry_var; int i; char inbuf[101]; */ /* /* /* /* /* 1

and similarly to determine the data type of the column, the program can use the statement:

number of columns chosen */ allocated SQLDA for query */ SQLVAR for current column */ index for SQLVAR array in SQLDA */ input entered by user */

- 235 -

/* Prompt the user for which table to query */ printf("*** Mini-Query Program ***\n\n") printf("Enter name of table for query: "); gets(querytbl); /* Start the SELECT statement in the buffer */

GET DESCRIPTOR qrydesc VALUE(:i + 1) :type = TYPE;

FIGURE 18-9

As you can see, the details of row-by-row query processing within the for loop of the program will differ dramatically from those in Figure 18-9. Having processed all rows of query results, the program closes the cursor at callout 8. The CLOSE statement remains unchanged under SQL2. Following the closing of the cursor, it would be good practice to deallocate the SQL2 descriptor(s), which would have been allocated at the very beginning of the program. The changes required to the dynamic SQL programs in Figures 18-8, 18-9, and 18-14 to make them conform to the SQL2 standard illustrate, in detail, the new features specified by the standard and the degree to which they differ from common dynamic SQL usage today. In summary, the changes from DB2-style dynamic SQL are: I The SQLDA structure is replaced with a named SQL2 descriptor. I The ALLOCATE DESCRIPTOR and DEALLOCATE DESCRIPTOR statements are used to create and destroy descriptors, replacing allocation and deallocation of host program SQLDA data structures. I Instead of directly manipulating elements of the SQLDA, the program specifies parameter values and information through the SET DESCRIPTOR statement. I Instead of directly manipulating elements of the SQLDA, the program obtains information about query results and obtains the query result data itself through the GET DESCRIPTOR statement.

Data retrieval with dynamic SQL (continued)

18:

Part V:

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