Oracle錶值函式的兩種寫法

-- 建立表

declare
cnt integer;
begin
select count(0)
into cnt
from user_all_tables
where table_name = 'cmstemp';
if cnt = 0 then
execute immediate '  create table cmstemp(
id integer primary key,
name varchar2(32),
age integer,
address varchar2(64)
)';end if;
end;
-- 建立 type
declare
cnt integer;
begin
select count(0) into cnt from user_types where type_name = 'cmstemptype';
if cnt = 0 then
execute immediate 'create or replace type cmstemptype as object ( 
id integer,
name varchar2(32),
age integer,
address varchar2(64)
)';  end if;
end;
-- 建立type 表
declare
cnt integer;
begin
select count(0) into cnt from user_types where type_name = 'cmstemptypetable';
if cnt = 0 then
execute immediate '
create or replace type cmstemptypetable as table of cmstemptype ' ; 
end if;
end;
-- 建立臨時表
declare
cnt integer;
begin
select count(0)
into cnt
from user_all_tables
where table_name = 'cmstempglo';
if cnt = 0 then
execute immediate 'create global temporary table cmstempglo(
id integer primary key,
name varchar2(32),
age integer,
address varchar2(64)
)  on commit preserve rows';
end if;
end;
--建立包
create or replace package globalpackge
astype cur1 is ref cursor;
end;

第一種方式使用臨時表

create or replace function ns_cms_getcmstem(name varchar2)

return cmstemptypetable
pipelined is
pragma autonomous_transaction;
v_name    varchar2(32);
v_age     integer;
v_address varchar2(64);
v_id      integer;
rws       cmstemptype := cmstemptype(null, null, null, null);
v_cur     globalpackge.cur1;
begin
execute immediate 'truncate table cmstempglo';
for rec in (select * from cmstemp) loop
v_name    := rec.name;
v_age     := rec.age;
v_id      := rec.id;
v_address := rec.address;
insert into cmstempglo
(id, address, age, name)
values
(v_id, v_address, v_age, v_name);
dbms_output.put_line('11111111111');
end loop;
commit;
open v_cur for
select * from cmstempglo;
loop
fetch v_cur
into rws.id,rws.name,rws.age,rws.address;
exit when v_cur%notfound;
pipe row(rws);
end loop;
close v_cur;
end;

第二種方式不適用臨時表

create or replace function ns_cms_getcmstemp(name varchar2)

return cmstemptypetable
pipelined as
pragma autonomous_transaction;
v_cur     globalpackge.cur1;
v_name    varchar2(32);
v_address varchar2(64);
v_age     integer;
v_id      integer;
ret_row   cmstemptype := cmstemptype(null, null, null, null);
ret_table cmstemptypetable := cmstemptypetable();  -- 這裡必須這樣寫
begin
for rec in (select * from cmstemp) loop
ret_table.extend;
ret_row.id      := rec.id;
ret_row.age     := rec.age;
ret_row.name    := rec.name;
ret_row.address := rec.address;
ret_table(ret_table.count) := ret_row;
end loop;
commit;
open v_cur for
select * from table(ret_table);
loop
fetch v_cur into ret_row.id,ret_row.name,ret_row.age,ret_row.address; --順序要和type物件裡定義的順序保持一致
exit when v_cur%notfound;
pipe row(ret_row);
end loop;
close v_cur;
end;

插入資料

declare

i integer;
begin
for i in 1 ..100 loop
insert into cmstemp values (i,'zhangsan'||i,1+i,'王府大街'||i);
commit;
end loop;
end;

查詢sql

select * from table(ns_cms_getcmstemp('')) ; 

select * from table(ns_cms_getcmstem('')) ;

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