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3. When the program wants to execute the previously prepared statement, it uses the EXECUTE statement and passes a value for each parameter marker to the DBMS. This is Step 2 of the DBMS interaction. The DBMS substitutes the parameter values, executes the previously generated application plan, and sets the SQLCODE/SQLSTATE values to indicate its completion status. 4. The program can use the EXECUTE statement repeatedly, supplying different parameter values each time the dynamic statement is executed. The DBMS can simply repeat Step 2 of the interaction, since the work in Step 1 has already been done, and the results of that work (the application plan for execution) will still be valid. Figure 18-4 shows a C program that uses these steps, which are labeled by the callouts in the figure. The program is a general-purpose table update program. It prompts the

. . . exec sql int char float char exec sql begin declare section; hostvar1 = 106; *hostvar2 = "Joe Smith"; hostvar3 = 150000.00; *hostvar4 = "01-JUN-1990"; end declare section;

main() { /* This is a general-purpose update program. It can be used for any update where a numeric column is to be updated in all rows where a second numeric column has a specified value. For example, you can use it to update quotas for selected salespeople or to update credit limits for selected customers. /* exec sql exec sql char float float exec sql char char char char include sqlca; begin declare section; stmtbuf[301] search_value; new_value; end declare section;

INSERT INTO OFFICES (CITY, REGION, TARGET, SALES, OFFICE) VALUES ('Dallas', 'Western', 275000.00, 0.00, 23) 1 row inserted. Similarly, if Mary Jones (employee number 109) signs up a new customer, Acme Industries, this INSERT statement adds the customer to the database as customer number 2125 with a $25,000 credit limit: INSERT INTO CUSTOMERS (COMPANY, CUST_REP, CUST_NUM, CREDIT_LIMIT) VALUES ('Acme Industries', 109, 2125, 25000.00) 1 row inserted.

exec sql update salesreps set manager = :hostvar1 where empl_num = 102; exec sql update salesreps set name = :hostvar2 where empl_num = 102: exec sql update salesreps set quota = :hostvar3 where empl_num = 102; exec sql update salesreps set hire_date = :hostvar4 where empl_num = 102; . . .

/* SQL text to be executed */ /* parameter value for searching */ /* parameter value for update */

17:

tblname[31]; searchcol[31]; updatecol[31]; yes_no[31];

SQL Type SMALLINT INTEGER REAL DOUBLE PRECISION NUMERIC(p,s) DECIMAL(p,s) CHAR(n) VARCHAR(n) BIT(n) BIT VARYING(n) DATE TIME TIMESTAMP INTERVAL

/* /* /* /*

C and C++ Type Short Long Float Double Double1 char x[n+1]2 char x[n+1]2 char x[1]3 char x[1] Requires conversion5 Requires conversion5 Requires conversion5 Requires conversion5

Just as the SQL INSERT statement adds new data to the database, the SQL DELETE statement removes data from the database. If Acme Industries decides a few days later to switch to a competitor, you can delete them from the database with this statement: DELETE FROM CUSTOMERS WHERE COMPANY = 'Acme Industries' 1 row deleted. And if you decide to terminate all salespeople whose sales are less than their quotas, you can remove them from the database with this DELETE statement: DELETE FROM SALESREPS WHERE SALES < QT<R 2 rows deleted.