[英]How to change PL/SQL function call when function is no longer pipelined?
我的PL / SQL函數看起來像:
FUNCTION get_agent_statistics ( id NUMBER
RETURN agent_stats_t
PIPELINED;
然后從中選擇(iBatis代碼):
SELECT * FROM table(pkg.get_agent_statistics(#id#))
如果要從函數中刪除PIPELINED
語句,應如何更改此選擇?
當您從函數聲明中刪除PIPELINED
子句時,函數不再是PIPELINED表函數,因此,如果仍然要使用from
子句,則必須修改函數的主體以將其轉換為TABLE函數。查詢或簡單函數,您將無法在查詢的from
子句中使用它。
附錄
Could I select something from non-pipelined function?
是的,如果您具有TABLE函數,則否。 這是幾個例子:
-- prerequisites
SQL> create or replace type T_rows as object(
2 e_name varchar2(21),
3 e_lname varchar2(21)
4 )
5 /
Type created
SQL> create or replace type T_tab is table of t_rows
2 /
Type created
-- PIPELINED TABLE function
SQL> create or replace function GetEnames
2 return T_Tab
3 pipelined
4 is
5 l_etab t_tab := t_tab();
6 begin
7 for i in (select first_name
8 , last_name
9 from employees)
10 loop
11 pipe row(t_rows(i.first_name, i.last_name));
12 --l_etab.extend;
13 --l_etab(l_etab.last) := t_rows(i.first_name, i.last_name);
14 end loop;
15 return ;--l_etab;
16 end;
17 /
Function created
SQL> select *
2 from table(getenames)
3 where rownum <= 5;
E_NAME E_LNAME
--------------------- ---------------------
Steven King
Neena Kochhar
Lex De Haan
Alexander Hunold
Bruce Ernst
-- non-pipelined table function
SQL> create or replace function GetEnames
2 return T_Tab
3
4 is
5 l_etab t_tab := t_tab();
6 begin
7 for i in (select first_name
8 , last_name
9 from employees)
10 loop
11 --pipe row(t_rows(i.first_name, i.last_name));
12 l_etab.extend;
13 l_etab(l_etab.last) := t_rows(i.first_name, i.last_name);
14 end loop;
15 return l_etab;
16 end;
17 /
Function created
SQL> select *
2 from table(getenames)
3 where rownum <= 5;
E_NAME E_LNAME
--------------------- ---------------------
Steven King
Neena Kochhar
Lex De Haan
Alexander Hunold
Bruce Ernst
SQL>
如果在沒有PIPELINED
語句的情況下可以使用編譯過程,則無需更改SELECT
。 看到這個-http://www.oracle-base.com/articles/misc/pipelined-table-functions.php
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.