在Oracle中,用函数返回结果集有时候要用到,下面是demo:
create or replace type t_test as object
(
id integer,
create_time date,
object_name varchar2(60)
);
create or replace type t_test_table as table of t_test;
1.用数组的方式
create or replace function f_test(n in number default null)
return t_test_table as
v_test t_test_table := t_test_table();
begin
for i in 1 .. n loop
v_test.extend();
v_test(v_test.count) := t_test(i, sysdate, 'name' || i);
end loop;
return v_test;
end f_test;
/
SQL> select * from table(f_test(5));
ID CREATE_TIME OBJECT_NAME
-------- -------------- -------------
1 07-4月 -15 name1
2 07-4月 -15 name2
3 07-4月 -15 name3
4 07-4月 -15 name4
5 07-4月 -15 name5
2.用管道函数
create or replace function f_test_pipe(n in number default null)
return t_test_table
PIPELINED as
v_test t_test_table := t_test_table();
begin
for i in 1 .. nvl(n, 100) loop
pipe row(t_test(i, sysdate, 'name' || i));
end loop;
return;
end f_test_pipe;
/
SQL> select * from table(f_test_pipe(5));
ID CREATE_TIME OBJECT_NAME
---------- -------------- ----------------
1 07-4月 -15 mc1
2 07-4月 -15 mc2
3 07-4月 -15 mc3
4 07-4月 -15 mc4
5 07-4月 -15 mc5