oracle returning into用法

CREATE TABLE t1 (id NUMBER(10),description VARCHAR2(50),CONSTRAINT t1_pk PRIMARY KEY (id));  
   
CREATE SEQUENCE t1_seq;  
   
INSERT INTO t1 VALUES (t1_seq.nextval, 'ONE');  
   
INSERT INTO t1 VALUES (t1_seq.nextval, 'TWO');  
   
INSERT INTO t1 VALUES (t1_seq.nextval, 'THREE');  
   
returning into語句的主要做用是：  
   
delete操做：returning返回的是delete以前的結果  
   
insert操做:returning返回的是insert以後的結果  
   
update操做:returning語句是返回update以後的結果  
   
注意：returning into語句不支持insert into select 語句和merge語句  
   
下面演示該語句的具體用法  
   
（1）獲取添加的值  
   
declare  
l_id t1.id%type;  
begin  
insert into t1 values(t1_seq.nextval,'four')  
returning id into l_id;  
commit;  
dbms_output.put_line('id='||l_id);  
end  
   
運行結果 id=4  
   
(2)更新和刪除  
   
1 DECLARE l_id t1.id%TYPE;  
 2 BEGIN  
 3 UPDATE t1  
 4 SET description = 'two2'  
 5 WHERE ID=2  
 6 RETURNING id INTO l_id;  
 7 DBMS_OUTPUT.put_line('UPDATE ID=' || l_id);  
 8 DELETE FROM t1 WHERE description = 'THREE'  
 9 RETURNING id INTO l_id;  
 10 DBMS_OUTPUT.put_line('DELETE ID=' || l_id);  
 11 COMMIT;  
 12* END;  
SQL> /  
UPDATE ID=2  
DELETE ID=3  
（3）若是更新dml操做影響多條記錄能夠經過bulk collect into 來提取  
 1 declare  
 2 type t_tab is table of t1.id%type;  
 3 l_tab t_tab;  
 4 begin  
 5 update t1  
 6 set description=description  
 7 returning id bulk collect into l_tab;  
 8 for i in l_tab.first..l_tab.last loop  
 9 dbms_output.put_line('update id='||l_tab(i));  
 10 end loop;  
 11* end;  
SQL> /  
update id=21  
update id=22  
update id=23  
（4）若是插入操做影響多行也能夠獲取  
   
declare  
type description_table_type is table of t1.description%type;  
type t1_table_type is table of t1%rowtype;  
description_table description_table_type:=description_table_type('FIVE', 'SIX', 'SEVEN');  
t1_table t1_table_type;  
begin  
forall i in description_table.first..description_table.last  
insert into t1 values(t1_seq.nextval,description_table(i))  
returning id ,description bulk collect into t1_table;  
for i in t1_table.first..t1_table.last loop  
DBMS_OUTPUT.put_line('INSERT ID=' || t1_table(i).id ||'DESC='|| t1_table(i).description);  
end loop;  
end;  
/  
   
執行結果  
   
INSERT ID=27DESC=FIVE  
INSERT ID=28DESC=SIX  
INSERT ID=29DESC=SEVEN  
   
PL/SQL procedure successfully completed.  
   
forall指的是同時插入，若是使用for循環也能夠插入三條記錄，但默認returing只顯示最後一條

http://blog.csdn.net/whhitgen/article/details/12511505