Bulk-Fetching from a Cursor

[debasisdas]

We can fetch from a cursor into one or more collections:

[code=oracle]
DECLARE
TYPE NameList IS TABLE OF employees.last_ name%TYPE;
TYPE SalList IS TABLE OF employees.salar y%TYPE;
CURSOR c1 IS SELECT last_name, salary FROM employees WHERE salary > 10000;
names NameList;
sals SalList;
TYPE RecList IS TABLE OF c1%ROWTYPE;
recs RecList;
PROCEDURE print_results IS
BEGIN
dbms_output.put _line('Results: ');
IF names IS NULL OR names.COUNT = 0 THEN
RETURN; -- Don't print anything if collections are empty.
END IF;
FOR i IN names.FIRST .. names.LAST
LOOP
dbms_output.put _line(' Employee ' || names(i) || ': $' ||
sals(i));
END LOOP;
END;
BEGIN
dbms_output.put _line('--- Processing all results at once ---');
OPEN c1;
FETCH c1 BULK COLLECT INTO names, sals;
CLOSE c1;
print_results;
dbms_output.put _line('--- Processing 7 rows at a time ---');
OPEN c1;
LOOP
--LIMIT restricts the number of records to fetch.
FETCH c1 BULK COLLECT INTO names, sals LIMIT 7;
EXIT WHEN c1%NOTFOUND;
print_results;
END LOOP;
-- Loop exits when fewer than 7 rows are fetched. Have to
-- process the last few. Need extra checking inside PRINT_RESULTS
-- in case it is called when the collection is empty.
print_results;
CLOSE c1;
dbms_output.put _line('--- Fetching records rather than columns ---');
OPEN c1;
FETCH c1 BULK COLLECT INTO recs;
FOR i IN recs.FIRST .. recs.LAST
LOOP
-- Now all the columns from the result set come from a single record.
dbms_output.put _line(' Employee ' || recs(i).last_na me || ': $'
|| recs(i).salary) ;
END LOOP;
END;[/code]