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/* employee number (from user) */ /* retrieved salesperson name */ /* retrieved quota */ /* retrieved sales */ /* null indicator array */

Employee Number: 106 Name: Sue Jackson Office: 22 Quota: 175000.00 Employee Number: 104 Name: Joe Smith Office: * Quota: 275000.00

/* Prompt the user for the employee number */ printf("Enter salesrep number: "); scanf("%d", &repnum); /* Execute the SQL query */ exec sql select name, quota, sales into :repinfo :rep_ind; from salesreps where empl_num = :repnum /* Display the retrieved data */ if (sqlca.sqlcode = = 0){ printf("Name: %s\n", repinfo.name); if (rep_ind[1] < 0) printf("quota is NULL\n"); else printf("Quota: %f\n", repinfo.quota); printf("Sales: %f\n", repinfo.sales); } else if (sqlca.sqlcode = = 100) printf("No salesperson with that employee number.\n"); else printf("SQL error: %ld\n", sqlca.sqlcode); exit(); }

Based on the user s response to the initial questions, the program generates this dynamic UPDATE statement and prepares it:

FIGURE 17-22

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:

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Input and output host variables are declared the same way and are specified using the same colon notation within an embedded SQL statement. However, it s often useful to think in terms of input and output host variables when you re actually coding an embedded SQL program. Input host variables can be used in any SQL statement where a constant can appear. Output host variables are used only with the singleton SELECT statement and with the FETCH statement, described in the next section of this chapter.

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and with the second set of parameter values, it becomes:

Part V:

This program is somewhat complex, but it s simple compared to 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.

When a query produces an entire table of query results, embedded SQL must provide a way for the application program to process the query results one row at a time. Embedded SQL supports this capability by defining a new SQL concept, called a cursor, and adding several statements to the interactive SQL language. Here is an overview of embedded SQL techniques for multirow query processing and the new statements it requires: 1. The DECLARE CURSOR statement specifies the query to be performed and associates a cursor name with the query. 2. The OPEN statement asks the DBMS to start executing the query and generating query results. It positions the cursor before the first row of query results. 3. The FETCH statement advances the cursor to the first row of query results and retrieves its data into host variables for use by the application program. Subsequent FETCH statements move through the query results row by row, advancing the cursor to the next row of query results and retrieving its data into the host variables. 4. The CLOSE statement ends access to the query results and breaks the association between the cursor and the query results. Figure 17-23 shows a program that uses embedded SQL to perform a simple multirow query. The numbered callouts in the figure correspond to the numbers in the preceding steps. The program retrieves and displays, in alphabetical order, the name, quota, and yearto-date sales of each salesperson whose sales exceed quota. The interactive SQL query that prints this information is

SELECT FROM WHERE ORDER NAME, QUOTA, SALES SALESREPS SALES > QUOTA BY NAME;

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

INSERT INTO SALESREPS (EMPL_NUM, NAME, REP_OFFICE, HIRE_DATE, SALES) VALUES (115,'Ben Adams', 14, '01-APR-90', 000) INSERT INTO OFFICES (OFFICE, CITY, REGION, MGR, TARGET, SALES) VALUES (14,'Detroit', 'Eastern', 115, 000, 000) Unfortunately, the first INSERT statement (for Ben Adams) will fail Why Because the new row refers to office number 14, which is not yet in the database! Of course, reversing the order of the INSERT statements doesn't help: INSERT INTO OFFICES (OFFICE, CITY, REGION, MGR, TARGET, SALES) VALUES (14,'Detroit', 'Eastern', 115, 000, 000) INSERT INTO SALESREPS (EMPL_NUM, NAME, REP_OFFICE, HIRE_DATE, SALES) VALUES (115,'Ben Adams', 14, '01-APR-90', 0.

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