Oracle管道函数(Pipelined Table Function)实现的实例

1. 简单的例子(返回单列的表)

1>创建一个表类型

create or replace type t_table is table of number;

2>创建函数返回上面定义的类型

create or replace function f_pipe(s number)
return t_table pipelined
as
    v_number number;
begin
for i in 1..s loop
    v_number := i;
    pipe row(v_number);
end loop;
return;
end f_pipe;

    ;

3>测试

select * from table(f_pipe(5))

2.复杂一点的例子

1>创建一个表类型(有多个列)

create or replace type obj_table as object
(
  id int,
  name varchar2(50)
)

2>创建函数返回上面定义的类型

create or replace function f_pipe(s number)
return t_table pipelined
as
    v_obj_table obj_table;
begin
for i in 1..s loop
    v_obj_table :=  obj_table(i,to_char(i*i));
    pipe   row(v_obj_table);
end loop;
return;
end f_pipe;

3>测试

select * from table(f_pipe(5))